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39
40#include "qrect.h"
41#include "qdatastream.h"
42#include "qmath.h"
43
44#include <private/qdebug_p.h>
45
46QT_BEGIN_NAMESPACE
47
48/*!
49 \class QRect
50 \inmodule QtCore
51 \ingroup painting
52 \reentrant
53
54 \brief The QRect class defines a rectangle in the plane using
55 integer precision.
56
57 A rectangle is normally expressed as a top-left corner and a
58 size. The size (width and height) of a QRect is always equivalent
59 to the mathematical rectangle that forms the basis for its
60 rendering.
61
62 A QRect can be constructed with a set of left, top, width and
63 height integers, or from a QPoint and a QSize. The following code
64 creates two identical rectangles.
65
66 \snippet code/src_corelib_tools_qrect.cpp 0
67
68 There is a third constructor that creates a QRect using the
69 top-left and bottom-right coordinates, but we recommend that you
70 avoid using it. The rationale is that for historical reasons the
71 values returned by the bottom() and right() functions deviate from
72 the true bottom-right corner of the rectangle.
73
74 The QRect class provides a collection of functions that return the
75 various rectangle coordinates, and enable manipulation of
76 these. QRect also provides functions to move the rectangle relative
77 to the various coordinates. In addition there is a moveTo()
78 function that moves the rectangle, leaving its top left corner at
79 the given coordinates. Alternatively, the translate() function
80 moves the rectangle the given offset relative to the current
81 position, and the translated() function returns a translated copy
82 of this rectangle.
83
84 The size() function returns the rectange's dimensions as a
85 QSize. The dimensions can also be retrieved separately using the
86 width() and height() functions. To manipulate the dimensions use
87 the setSize(), setWidth() or setHeight() functions. Alternatively,
88 the size can be changed by applying either of the functions
89 setting the rectangle coordinates, for example, setBottom() or
90 setRight().
91
92 The contains() function tells whether a given point is inside the
93 rectangle or not, and the intersects() function returns \c true if
94 this rectangle intersects with a given rectangle. The QRect class
95 also provides the intersected() function which returns the
96 intersection rectangle, and the united() function which returns the
97 rectangle that encloses the given rectangle and this:
98
99 \table
100 \row
101 \li \inlineimage qrect-intersect.png
102 \li \inlineimage qrect-unite.png
103 \row
104 \li intersected()
105 \li united()
106 \endtable
107
108 The isEmpty() function returns \c true if left() > right() or top() >
109 bottom(). Note that an empty rectangle is not valid: The isValid()
110 function returns \c true if left() <= right() \e and top() <=
111 bottom(). A null rectangle (isNull() == true) on the other hand,
112 has both width and height set to 0.
113
114 Note that due to the way QRect and QRectF are defined, an
115 empty QRect is defined in essentially the same way as QRectF.
116
117 Finally, QRect objects can be streamed as well as compared.
118
119 \tableofcontents
120
121 \section1 Rendering
122
123 When using an \l {QPainter::Antialiasing}{anti-aliased} painter,
124 the boundary line of a QRect will be rendered symmetrically on
125 both sides of the mathematical rectangle's boundary line. But when
126 using an aliased painter (the default) other rules apply.
127
128 Then, when rendering with a one pixel wide pen the QRect's boundary
129 line will be rendered to the right and below the mathematical
130 rectangle's boundary line.
131
132 When rendering with a two pixels wide pen the boundary line will
133 be split in the middle by the mathematical rectangle. This will be
134 the case whenever the pen is set to an even number of pixels,
135 while rendering with a pen with an odd number of pixels, the spare
136 pixel will be rendered to the right and below the mathematical
137 rectangle as in the one pixel case.
138
139 \table
140 \row
141 \li \inlineimage qrect-diagram-zero.png
142 \li \inlineimage qrect-diagram-one.png
143 \row
144 \li Logical representation
145 \li One pixel wide pen
146 \row
147 \li \inlineimage qrect-diagram-two.png
148 \li \inlineimage qrect-diagram-three.png
149 \row
150 \li Two pixel wide pen
151 \li Three pixel wide pen
152 \endtable
153
154 \section1 Coordinates
155
156 The QRect class provides a collection of functions that return the
157 various rectangle coordinates, and enable manipulation of
158 these. QRect also provides functions to move the rectangle relative
159 to the various coordinates.
160
161 For example the left(), setLeft() and moveLeft() functions as an
162 example: left() returns the x-coordinate of the rectangle's left
163 edge, setLeft() sets the left edge of the rectangle to the given x
164 coordinate (it may change the width, but will never change the
165 rectangle's right edge) and moveLeft() moves the entire rectangle
166 horizontally, leaving the rectangle's left edge at the given x
167 coordinate and its size unchanged.
168
169 \image qrect-coordinates.png
170
171 Note that for historical reasons the values returned by the
172 bottom() and right() functions deviate from the true bottom-right
173 corner of the rectangle: The right() function returns \e { left()
174 + width() - 1} and the bottom() function returns \e {top() +
175 height() - 1}. The same is the case for the point returned by the
176 bottomRight() convenience function. In addition, the x and y
177 coordinate of the topRight() and bottomLeft() functions,
178 respectively, contain the same deviation from the true right and
179 bottom edges.
180
181 We recommend that you use x() + width() and y() + height() to find
182 the true bottom-right corner, and avoid right() and
183 bottom(). Another solution is to use QRectF: The QRectF class
184 defines a rectangle in the plane using floating point accuracy for
185 coordinates, and the QRectF::right() and QRectF::bottom()
186 functions \e do return the right and bottom coordinates.
187
188 It is also possible to add offsets to this rectangle's coordinates
189 using the adjust() function, as well as retrieve a new rectangle
190 based on adjustments of the original one using the adjusted()
191 function. If either of the width and height is negative, use the
192 normalized() function to retrieve a rectangle where the corners
193 are swapped.
194
195 In addition, QRect provides the getCoords() function which extracts
196 the position of the rectangle's top-left and bottom-right corner,
197 and the getRect() function which extracts the rectangle's top-left
198 corner, width and height. Use the setCoords() and setRect()
199 function to manipulate the rectangle's coordinates and dimensions
200 in one go.
201
202 \section1 Constraints
203
204 QRect is limited to the minimum and maximum values for the \c int type.
205 Operations on a QRect that could potentially result in values outside this
206 range will result in undefined behavior.
207
208 \sa QRectF, QRegion
209*/
210
211/*****************************************************************************
212 QRect member functions
213 *****************************************************************************/
214
215/*!
216 \fn QRect::QRect()
217
218 Constructs a null rectangle.
219
220 \sa isNull()
221*/
222
223/*!
224 \fn QRect::QRect(const QPoint &topLeft, const QPoint &bottomRight)
225
226 Constructs a rectangle with the given \a topLeft and \a bottomRight corners.
227
228 \sa setTopLeft(), setBottomRight()
229*/
230
231
232/*!
233 \fn QRect::QRect(const QPoint &topLeft, const QSize &size)
234
235 Constructs a rectangle with the given \a topLeft corner and the
236 given \a size.
237
238 \sa setTopLeft(), setSize()
239*/
240
241
242/*!
243 \fn QRect::QRect(int x, int y, int width, int height)
244
245 Constructs a rectangle with (\a x, \a y) as its top-left corner
246 and the given \a width and \a height.
247
248 \sa setRect()
249*/
250
251
252/*!
253 \fn bool QRect::isNull() const
254
255 Returns \c true if the rectangle is a null rectangle, otherwise
256 returns \c false.
257
258 A null rectangle has both the width and the height set to 0 (i.e.,
259 right() == left() - 1 and bottom() == top() - 1). A null rectangle
260 is also empty, and hence is not valid.
261
262 \sa isEmpty(), isValid()
263*/
264
265/*!
266 \fn bool QRect::isEmpty() const
267
268 Returns \c true if the rectangle is empty, otherwise returns \c false.
269
270 An empty rectangle has a left() > right() or top() > bottom(). An
271 empty rectangle is not valid (i.e., isEmpty() == !isValid()).
272
273 Use the normalized() function to retrieve a rectangle where the
274 corners are swapped.
275
276 \sa isNull(), isValid(), normalized()
277*/
278
279/*!
280 \fn bool QRect::isValid() const
281
282 Returns \c true if the rectangle is valid, otherwise returns \c false.
283
284 A valid rectangle has a left() <= right() and top() <=
285 bottom(). Note that non-trivial operations like intersections are
286 not defined for invalid rectangles. A valid rectangle is not empty
287 (i.e., isValid() == !isEmpty()).
288
289 \sa isNull(), isEmpty(), normalized()
290*/
291
292
293/*!
294 Returns a normalized rectangle; i.e., a rectangle that has a
295 non-negative width and height.
296
297 If width() < 0 the function swaps the left and right corners, and
298 it swaps the top and bottom corners if height() < 0.
299
300 \sa isValid(), isEmpty()
301*/
302
303QRect QRect::normalized() const noexcept
304{
305 QRect r;
306 if (x2 < x1 - 1) { // swap bad x values
307 r.x1 = x2;
308 r.x2 = x1;
309 } else {
310 r.x1 = x1;
311 r.x2 = x2;
312 }
313 if (y2 < y1 - 1) { // swap bad y values
314 r.y1 = y2;
315 r.y2 = y1;
316 } else {
317 r.y1 = y1;
318 r.y2 = y2;
319 }
320 return r;
321}
322
323
324/*!
325 \fn int QRect::left() const
326
327 Returns the x-coordinate of the rectangle's left edge. Equivalent
328 to x().
329
330 \sa setLeft(), topLeft(), bottomLeft()
331*/
332
333/*!
334 \fn int QRect::top() const
335
336 Returns the y-coordinate of the rectangle's top edge.
337 Equivalent to y().
338
339 \sa setTop(), topLeft(), topRight()
340*/
341
342/*!
343 \fn int QRect::right() const
344
345 Returns the x-coordinate of the rectangle's right edge.
346
347 Note that for historical reasons this function returns left() +
348 width() - 1; use x() + width() to retrieve the true x-coordinate.
349
350 \sa setRight(), topRight(), bottomRight()
351*/
352
353/*!
354 \fn int QRect::bottom() const
355
356 Returns the y-coordinate of the rectangle's bottom edge.
357
358 Note that for historical reasons this function returns top() +
359 height() - 1; use y() + height() to retrieve the true y-coordinate.
360
361 \sa setBottom(), bottomLeft(), bottomRight()
362*/
363
364/*!
365 \fn int QRect::x() const
366
367 Returns the x-coordinate of the rectangle's left edge. Equivalent to left().
368
369 \sa setX(), y(), topLeft()
370*/
371
372/*!
373 \fn int QRect::y() const
374
375 Returns the y-coordinate of the rectangle's top edge. Equivalent to top().
376
377 \sa setY(), x(), topLeft()
378*/
379
380/*!
381 \fn void QRect::setLeft(int x)
382
383 Sets the left edge of the rectangle to the given \a x
384 coordinate. May change the width, but will never change the right
385 edge of the rectangle.
386
387 Equivalent to setX().
388
389 \sa left(), moveLeft()
390*/
391
392/*!
393 \fn void QRect::setTop(int y)
394
395 Sets the top edge of the rectangle to the given \a y
396 coordinate. May change the height, but will never change the
397 bottom edge of the rectangle.
398
399 Equivalent to setY().
400
401 \sa top(), moveTop()
402*/
403
404/*!
405 \fn void QRect::setRight(int x)
406
407 Sets the right edge of the rectangle to the given \a x
408 coordinate. May change the width, but will never change the left
409 edge of the rectangle.
410
411 \sa right(), moveRight()
412*/
413
414/*!
415 \fn void QRect::setBottom(int y)
416
417 Sets the bottom edge of the rectangle to the given \a y
418 coordinate. May change the height, but will never change the top
419 edge of the rectangle.
420
421 \sa bottom(), moveBottom(),
422*/
423
424/*!
425 \fn void QRect::setX(int x)
426
427 Sets the left edge of the rectangle to the given \a x
428 coordinate. May change the width, but will never change the right
429 edge of the rectangle.
430
431 Equivalent to setLeft().
432
433 \sa x(), setY(), setTopLeft()
434*/
435
436/*!
437 \fn void QRect::setY(int y)
438
439 Sets the top edge of the rectangle to the given \a y
440 coordinate. May change the height, but will never change the
441 bottom edge of the rectangle.
442
443 Equivalent to setTop().
444
445 \sa y(), setX(), setTopLeft()
446*/
447
448/*!
449 \fn void QRect::setTopLeft(const QPoint &position)
450
451 Set the top-left corner of the rectangle to the given \a
452 position. May change the size, but will never change the
453 bottom-right corner of the rectangle.
454
455 \sa topLeft(), moveTopLeft()
456*/
457
458/*!
459 \fn void QRect::setBottomRight(const QPoint &position)
460
461 Set the bottom-right corner of the rectangle to the given \a
462 position. May change the size, but will never change the
463 top-left corner of the rectangle.
464
465 \sa bottomRight(), moveBottomRight()
466*/
467
468/*!
469 \fn void QRect::setTopRight(const QPoint &position)
470
471 Set the top-right corner of the rectangle to the given \a
472 position. May change the size, but will never change the
473 bottom-left corner of the rectangle.
474
475 \sa topRight(), moveTopRight()
476*/
477
478/*!
479 \fn void QRect::setBottomLeft(const QPoint &position)
480
481 Set the bottom-left corner of the rectangle to the given \a
482 position. May change the size, but will never change the
483 top-right corner of the rectangle.
484
485 \sa bottomLeft(), moveBottomLeft()
486*/
487
488/*!
489 \fn QPoint QRect::topLeft() const
490
491 Returns the position of the rectangle's top-left corner.
492
493 \sa setTopLeft(), top(), left()
494*/
495
496/*!
497 \fn QPoint QRect::bottomRight() const
498
499 Returns the position of the rectangle's bottom-right corner.
500
501 Note that for historical reasons this function returns
502 QPoint(left() + width() -1, top() + height() - 1).
503
504 \sa setBottomRight(), bottom(), right()
505*/
506
507/*!
508 \fn QPoint QRect::topRight() const
509
510 Returns the position of the rectangle's top-right corner.
511
512 Note that for historical reasons this function returns
513 QPoint(left() + width() -1, top()).
514
515 \sa setTopRight(), top(), right()
516*/
517
518/*!
519 \fn QPoint QRect::bottomLeft() const
520
521 Returns the position of the rectangle's bottom-left corner. Note
522 that for historical reasons this function returns QPoint(left(),
523 top() + height() - 1).
524
525 \sa setBottomLeft(), bottom(), left()
526*/
527
528/*!
529 \fn QPoint QRect::center() const
530
531 Returns the center point of the rectangle.
532
533 \sa moveCenter()
534*/
535
536
537/*!
538 \fn void QRect::getRect(int *x, int *y, int *width, int *height) const
539
540 Extracts the position of the rectangle's top-left corner to *\a x
541 and *\a y, and its dimensions to *\a width and *\a height.
542
543 \sa setRect(), getCoords()
544*/
545
546
547/*!
548 \fn void QRect::getCoords(int *x1, int *y1, int *x2, int *y2) const
549
550 Extracts the position of the rectangle's top-left corner to *\a x1
551 and *\a y1, and the position of the bottom-right corner to *\a x2
552 and *\a y2.
553
554 \sa setCoords(), getRect()
555*/
556
557/*!
558 \fn void QRect::moveLeft(int x)
559
560 Moves the rectangle horizontally, leaving the rectangle's left
561 edge at the given \a x coordinate. The rectangle's size is
562 unchanged.
563
564 \sa left(), setLeft(), moveRight()
565*/
566
567/*!
568 \fn void QRect::moveTop(int y)
569
570 Moves the rectangle vertically, leaving the rectangle's top edge
571 at the given \a y coordinate. The rectangle's size is unchanged.
572
573 \sa top(), setTop(), moveBottom()
574*/
575
576
577/*!
578 \fn void QRect::moveRight(int x)
579
580 Moves the rectangle horizontally, leaving the rectangle's right
581 edge at the given \a x coordinate. The rectangle's size is
582 unchanged.
583
584 \sa right(), setRight(), moveLeft()
585*/
586
587
588/*!
589 \fn void QRect::moveBottom(int y)
590
591 Moves the rectangle vertically, leaving the rectangle's bottom
592 edge at the given \a y coordinate. The rectangle's size is
593 unchanged.
594
595 \sa bottom(), setBottom(), moveTop()
596*/
597
598
599/*!
600 \fn void QRect::moveTopLeft(const QPoint &position)
601
602 Moves the rectangle, leaving the top-left corner at the given \a
603 position. The rectangle's size is unchanged.
604
605 \sa setTopLeft(), moveTop(), moveLeft()
606*/
607
608
609/*!
610 \fn void QRect::moveBottomRight(const QPoint &position)
611
612 Moves the rectangle, leaving the bottom-right corner at the given
613 \a position. The rectangle's size is unchanged.
614
615 \sa setBottomRight(), moveRight(), moveBottom()
616*/
617
618
619/*!
620 \fn void QRect::moveTopRight(const QPoint &position)
621
622 Moves the rectangle, leaving the top-right corner at the given \a
623 position. The rectangle's size is unchanged.
624
625 \sa setTopRight(), moveTop(), moveRight()
626*/
627
628
629/*!
630 \fn void QRect::moveBottomLeft(const QPoint &position)
631
632 Moves the rectangle, leaving the bottom-left corner at the given
633 \a position. The rectangle's size is unchanged.
634
635 \sa setBottomLeft(), moveBottom(), moveLeft()
636*/
637
638
639/*!
640 \fn void QRect::moveCenter(const QPoint &position)
641
642 Moves the rectangle, leaving the center point at the given \a
643 position. The rectangle's size is unchanged.
644
645 \sa center()
646*/
647
648/*!
649 \fn void QRect::moveTo(int x, int y)
650
651 Moves the rectangle, leaving the top-left corner at the given
652 position (\a x, \a y). The rectangle's size is unchanged.
653
654 \sa translate(), moveTopLeft()
655*/
656
657/*!
658 \fn void QRect::moveTo(const QPoint &position)
659
660 Moves the rectangle, leaving the top-left corner at the given \a
661 position.
662*/
663
664/*!
665 \fn void QRect::translate(int dx, int dy)
666
667 Moves the rectangle \a dx along the x axis and \a dy along the y
668 axis, relative to the current position. Positive values move the
669 rectangle to the right and down.
670
671 \sa moveTopLeft(), moveTo(), translated()
672*/
673
674
675/*!
676 \fn void QRect::translate(const QPoint &offset)
677 \overload
678
679 Moves the rectangle \a{offset}.\l{QPoint::x()}{x()} along the x
680 axis and \a{offset}.\l{QPoint::y()}{y()} along the y axis,
681 relative to the current position.
682*/
683
684
685/*!
686 \fn QRect QRect::translated(int dx, int dy) const
687
688 Returns a copy of the rectangle that is translated \a dx along the
689 x axis and \a dy along the y axis, relative to the current
690 position. Positive values move the rectangle to the right and
691 down.
692
693 \sa translate()
694
695*/
696
697
698/*!
699 \fn QRect QRect::translated(const QPoint &offset) const
700
701 \overload
702
703 Returns a copy of the rectangle that is translated
704 \a{offset}.\l{QPoint::x()}{x()} along the x axis and
705 \a{offset}.\l{QPoint::y()}{y()} along the y axis, relative to the
706 current position.
707*/
708
709/*!
710 \fn QRect QRect::transposed() const
711 \since 5.7
712
713 Returns a copy of the rectangle that has its width and height
714 exchanged:
715
716 \snippet code/src_corelib_tools_qrect.cpp 2
717
718 \sa QSize::transposed()
719*/
720
721/*!
722 \fn void QRect::setRect(int x, int y, int width, int height)
723
724 Sets the coordinates of the rectangle's top-left corner to (\a{x},
725 \a{y}), and its size to the given \a width and \a height.
726
727 \sa getRect(), setCoords()
728*/
729
730
731/*!
732 \fn void QRect::setCoords(int x1, int y1, int x2, int y2)
733
734 Sets the coordinates of the rectangle's top-left corner to (\a x1,
735 \a y1), and the coordinates of its bottom-right corner to (\a x2,
736 \a y2).
737
738 \sa getCoords(), setRect()
739*/
740
741
742/*! \fn QRect QRect::adjusted(int dx1, int dy1, int dx2, int dy2) const
743
744 Returns a new rectangle with \a dx1, \a dy1, \a dx2 and \a dy2
745 added respectively to the existing coordinates of this rectangle.
746
747 \sa adjust()
748*/
749
750/*! \fn void QRect::adjust(int dx1, int dy1, int dx2, int dy2)
751
752 Adds \a dx1, \a dy1, \a dx2 and \a dy2 respectively to the
753 existing coordinates of the rectangle.
754
755 \sa adjusted(), setRect()
756*/
757
758/*!
759 \fn QSize QRect::size() const
760
761 Returns the size of the rectangle.
762
763 \sa setSize(), width(), height()
764*/
765
766/*!
767 \fn int QRect::width() const
768
769 Returns the width of the rectangle.
770
771 \sa setWidth(), height(), size()
772*/
773
774/*!
775 \fn int QRect::height() const
776
777 Returns the height of the rectangle.
778
779 \sa setHeight(), width(), size()
780*/
781
782/*!
783 \fn void QRect::setWidth(int width)
784
785 Sets the width of the rectangle to the given \a width. The right
786 edge is changed, but not the left one.
787
788 \sa width(), setSize()
789*/
790
791
792/*!
793 \fn void QRect::setHeight(int height)
794
795 Sets the height of the rectangle to the given \a height. The bottom
796 edge is changed, but not the top one.
797
798 \sa height(), setSize()
799*/
800
801
802/*!
803 \fn void QRect::setSize(const QSize &size)
804
805 Sets the size of the rectangle to the given \a size. The top-left
806 corner is not moved.
807
808 \sa size(), setWidth(), setHeight()
809*/
810
811
812/*!
813 \fn bool QRect::contains(const QPoint &point, bool proper) const
814
815 Returns \c true if the given \a point is inside or on the edge of
816 the rectangle, otherwise returns \c false. If \a proper is true, this
817 function only returns \c true if the given \a point is \e inside the
818 rectangle (i.e., not on the edge).
819
820 \sa intersects()
821*/
822
823bool QRect::contains(const QPoint &p, bool proper) const noexcept
824{
825 int l, r;
826 if (x2 < x1 - 1) {
827 l = x2;
828 r = x1;
829 } else {
830 l = x1;
831 r = x2;
832 }
833 if (proper) {
834 if (p.x() <= l || p.x() >= r)
835 return false;
836 } else {
837 if (p.x() < l || p.x() > r)
838 return false;
839 }
840 int t, b;
841 if (y2 < y1 - 1) {
842 t = y2;
843 b = y1;
844 } else {
845 t = y1;
846 b = y2;
847 }
848 if (proper) {
849 if (p.y() <= t || p.y() >= b)
850 return false;
851 } else {
852 if (p.y() < t || p.y() > b)
853 return false;
854 }
855 return true;
856}
857
858
859/*!
860 \fn bool QRect::contains(int x, int y, bool proper) const
861 \overload
862
863 Returns \c true if the point (\a x, \a y) is inside or on the edge of
864 the rectangle, otherwise returns \c false. If \a proper is true, this
865 function only returns \c true if the point is entirely inside the
866 rectangle(not on the edge).
867*/
868
869/*!
870 \fn bool QRect::contains(int x, int y) const
871 \overload
872
873 Returns \c true if the point (\a x, \a y) is inside this rectangle,
874 otherwise returns \c false.
875*/
876
877/*!
878 \fn bool QRect::contains(const QRect &rectangle, bool proper) const
879 \overload
880
881 Returns \c true if the given \a rectangle is inside this rectangle.
882 otherwise returns \c false. If \a proper is true, this function only
883 returns \c true if the \a rectangle is entirely inside this
884 rectangle (not on the edge).
885*/
886
887bool QRect::contains(const QRect &r, bool proper) const noexcept
888{
889 if (isNull() || r.isNull())
890 return false;
891
892 int l1 = x1;
893 int r1 = x1;
894 if (x2 - x1 + 1 < 0)
895 l1 = x2;
896 else
897 r1 = x2;
898
899 int l2 = r.x1;
900 int r2 = r.x1;
901 if (r.x2 - r.x1 + 1 < 0)
902 l2 = r.x2;
903 else
904 r2 = r.x2;
905
906 if (proper) {
907 if (l2 <= l1 || r2 >= r1)
908 return false;
909 } else {
910 if (l2 < l1 || r2 > r1)
911 return false;
912 }
913
914 int t1 = y1;
915 int b1 = y1;
916 if (y2 - y1 + 1 < 0)
917 t1 = y2;
918 else
919 b1 = y2;
920
921 int t2 = r.y1;
922 int b2 = r.y1;
923 if (r.y2 - r.y1 + 1 < 0)
924 t2 = r.y2;
925 else
926 b2 = r.y2;
927
928 if (proper) {
929 if (t2 <= t1 || b2 >= b1)
930 return false;
931 } else {
932 if (t2 < t1 || b2 > b1)
933 return false;
934 }
935
936 return true;
937}
938
939/*!
940 \fn QRect& QRect::operator|=(const QRect &rectangle)
941
942 Unites this rectangle with the given \a rectangle.
943
944 \sa united(), operator|()
945*/
946
947/*!
948 \fn QRect& QRect::operator&=(const QRect &rectangle)
949
950 Intersects this rectangle with the given \a rectangle.
951
952 \sa intersected(), operator&()
953*/
954
955
956/*!
957 \fn QRect QRect::operator|(const QRect &rectangle) const
958
959 Returns the bounding rectangle of this rectangle and the given \a
960 rectangle.
961
962 \sa operator|=(), united()
963*/
964
965QRect QRect::operator|(const QRect &r) const noexcept
966{
967 if (isNull())
968 return r;
969 if (r.isNull())
970 return *this;
971
972 int l1 = x1;
973 int r1 = x1;
974 if (x2 - x1 + 1 < 0)
975 l1 = x2;
976 else
977 r1 = x2;
978
979 int l2 = r.x1;
980 int r2 = r.x1;
981 if (r.x2 - r.x1 + 1 < 0)
982 l2 = r.x2;
983 else
984 r2 = r.x2;
985
986 int t1 = y1;
987 int b1 = y1;
988 if (y2 - y1 + 1 < 0)
989 t1 = y2;
990 else
991 b1 = y2;
992
993 int t2 = r.y1;
994 int b2 = r.y1;
995 if (r.y2 - r.y1 + 1 < 0)
996 t2 = r.y2;
997 else
998 b2 = r.y2;
999
1000 QRect tmp;
1001 tmp.x1 = qMin(l1, l2);
1002 tmp.x2 = qMax(r1, r2);
1003 tmp.y1 = qMin(t1, t2);
1004 tmp.y2 = qMax(b1, b2);
1005 return tmp;
1006}
1007
1008/*!
1009 \fn QRect QRect::unite(const QRect &rectangle) const
1010 \obsolete
1011
1012 Use united(\a rectangle) instead.
1013*/
1014
1015/*!
1016 \fn QRect QRect::united(const QRect &rectangle) const
1017 \since 4.2
1018
1019 Returns the bounding rectangle of this rectangle and the given \a rectangle.
1020
1021 \image qrect-unite.png
1022
1023 \sa intersected()
1024*/
1025
1026
1027/*!
1028 \fn QRect QRect::operator&(const QRect &rectangle) const
1029
1030 Returns the intersection of this rectangle and the given \a
1031 rectangle. Returns an empty rectangle if there is no intersection.
1032
1033 \sa operator&=(), intersected()
1034*/
1035
1036QRect QRect::operator&(const QRect &r) const noexcept
1037{
1038 if (isNull() || r.isNull())
1039 return QRect();
1040
1041 int l1 = x1;
1042 int r1 = x1;
1043 if (x2 - x1 + 1 < 0)
1044 l1 = x2;
1045 else
1046 r1 = x2;
1047
1048 int l2 = r.x1;
1049 int r2 = r.x1;
1050 if (r.x2 - r.x1 + 1 < 0)
1051 l2 = r.x2;
1052 else
1053 r2 = r.x2;
1054
1055 if (l1 > r2 || l2 > r1)
1056 return QRect();
1057
1058 int t1 = y1;
1059 int b1 = y1;
1060 if (y2 - y1 + 1 < 0)
1061 t1 = y2;
1062 else
1063 b1 = y2;
1064
1065 int t2 = r.y1;
1066 int b2 = r.y1;
1067 if (r.y2 - r.y1 + 1 < 0)
1068 t2 = r.y2;
1069 else
1070 b2 = r.y2;
1071
1072 if (t1 > b2 || t2 > b1)
1073 return QRect();
1074
1075 QRect tmp;
1076 tmp.x1 = qMax(l1, l2);
1077 tmp.x2 = qMin(r1, r2);
1078 tmp.y1 = qMax(t1, t2);
1079 tmp.y2 = qMin(b1, b2);
1080 return tmp;
1081}
1082
1083/*!
1084 \fn QRect QRect::intersect(const QRect &rectangle) const
1085 \obsolete
1086
1087 Use intersected(\a rectangle) instead.
1088*/
1089
1090/*!
1091 \fn QRect QRect::intersected(const QRect &rectangle) const
1092 \since 4.2
1093
1094 Returns the intersection of this rectangle and the given \a
1095 rectangle. Note that \c{r.intersected(s)} is equivalent to \c{r & s}.
1096
1097 \image qrect-intersect.png
1098
1099 \sa intersects(), united(), operator&=()
1100*/
1101
1102/*!
1103 \fn bool QRect::intersects(const QRect &rectangle) const
1104
1105 Returns \c true if this rectangle intersects with the given \a
1106 rectangle (i.e., there is at least one pixel that is within both
1107 rectangles), otherwise returns \c false.
1108
1109 The intersection rectangle can be retrieved using the intersected()
1110 function.
1111
1112 \sa contains()
1113*/
1114
1115bool QRect::intersects(const QRect &r) const noexcept
1116{
1117 if (isNull() || r.isNull())
1118 return false;
1119
1120 int l1 = x1;
1121 int r1 = x1;
1122 if (x2 - x1 + 1 < 0)
1123 l1 = x2;
1124 else
1125 r1 = x2;
1126
1127 int l2 = r.x1;
1128 int r2 = r.x1;
1129 if (r.x2 - r.x1 + 1 < 0)
1130 l2 = r.x2;
1131 else
1132 r2 = r.x2;
1133
1134 if (l1 > r2 || l2 > r1)
1135 return false;
1136
1137 int t1 = y1;
1138 int b1 = y1;
1139 if (y2 - y1 + 1 < 0)
1140 t1 = y2;
1141 else
1142 b1 = y2;
1143
1144 int t2 = r.y1;
1145 int b2 = r.y1;
1146 if (r.y2 - r.y1 + 1 < 0)
1147 t2 = r.y2;
1148 else
1149 b2 = r.y2;
1150
1151 if (t1 > b2 || t2 > b1)
1152 return false;
1153
1154 return true;
1155}
1156
1157/*!
1158 \fn bool operator==(const QRect &r1, const QRect &r2)
1159 \relates QRect
1160
1161 Returns \c true if the rectangles \a r1 and \a r2 are equal,
1162 otherwise returns \c false.
1163*/
1164
1165
1166/*!
1167 \fn bool operator!=(const QRect &r1, const QRect &r2)
1168 \relates QRect
1169
1170 Returns \c true if the rectangles \a r1 and \a r2 are different, otherwise
1171 returns \c false.
1172*/
1173
1174/*!
1175 \fn QRect operator+(const QRect &rectangle, const QMargins &margins)
1176 \relates QRect
1177
1178 Returns the \a rectangle grown by the \a margins.
1179
1180 \since 5.1
1181*/
1182
1183/*!
1184 \fn QRect operator+(const QMargins &margins, const QRect &rectangle)
1185 \relates QRect
1186 \overload
1187
1188 Returns the \a rectangle grown by the \a margins.
1189
1190 \since 5.1
1191*/
1192
1193/*!
1194 \fn QRect operator-(const QRect &lhs, const QMargins &rhs)
1195 \relates QRect
1196
1197 Returns the \a lhs rectangle shrunk by the \a rhs margins.
1198
1199 \since 5.3
1200*/
1201
1202/*!
1203 \fn QRect QRect::marginsAdded(const QMargins &margins) const
1204
1205 Returns a rectangle grown by the \a margins.
1206
1207 \sa operator+=(), marginsRemoved(), operator-=()
1208
1209 \since 5.1
1210*/
1211
1212/*!
1213 \fn QRect QRect::operator+=(const QMargins &margins)
1214
1215 Adds the \a margins to the rectangle, growing it.
1216
1217 \sa marginsAdded(), marginsRemoved(), operator-=()
1218
1219 \since 5.1
1220*/
1221
1222/*!
1223 \fn QRect QRect::marginsRemoved(const QMargins &margins) const
1224
1225 Removes the \a margins from the rectangle, shrinking it.
1226
1227 \sa marginsAdded(), operator+=(), operator-=()
1228
1229 \since 5.1
1230*/
1231
1232/*!
1233 \fn QRect QRect::operator -=(const QMargins &margins)
1234
1235 Returns a rectangle shrunk by the \a margins.
1236
1237 \sa marginsRemoved(), operator+=(), marginsAdded()
1238
1239 \since 5.1
1240*/
1241
1242
1243/*****************************************************************************
1244 QRect stream functions
1245 *****************************************************************************/
1246#ifndef QT_NO_DATASTREAM
1247/*!
1248 \fn QDataStream &operator<<(QDataStream &stream, const QRect &rectangle)
1249 \relates QRect
1250
1251 Writes the given \a rectangle to the given \a stream, and returns
1252 a reference to the stream.
1253
1254 \sa {Serializing Qt Data Types}
1255*/
1256
1257QDataStream &operator<<(QDataStream &s, const QRect &r)
1258{
1259 if (s.version() == 1)
1260 s << (qint16)r.left() << (qint16)r.top()
1261 << (qint16)r.right() << (qint16)r.bottom();
1262 else
1263 s << (qint32)r.left() << (qint32)r.top()
1264 << (qint32)r.right() << (qint32)r.bottom();
1265 return s;
1266}
1267
1268/*!
1269 \fn QDataStream &operator>>(QDataStream &stream, QRect &rectangle)
1270 \relates QRect
1271
1272 Reads a rectangle from the given \a stream into the given \a
1273 rectangle, and returns a reference to the stream.
1274
1275 \sa {Serializing Qt Data Types}
1276*/
1277
1278QDataStream &operator>>(QDataStream &s, QRect &r)
1279{
1280 if (s.version() == 1) {
1281 qint16 x1, y1, x2, y2;
1282 s >> x1; s >> y1; s >> x2; s >> y2;
1283 r.setCoords(x1, y1, x2, y2);
1284 }
1285 else {
1286 qint32 x1, y1, x2, y2;
1287 s >> x1; s >> y1; s >> x2; s >> y2;
1288 r.setCoords(x1, y1, x2, y2);
1289 }
1290 return s;
1291}
1292
1293#endif // QT_NO_DATASTREAM
1294
1295
1296#ifndef QT_NO_DEBUG_STREAM
1297QDebug operator<<(QDebug dbg, const QRect &r)
1298{
1299 QDebugStateSaver saver(dbg);
1300 dbg.nospace();
1301 dbg << "QRect" << '(';
1302 QtDebugUtils::formatQRect(dbg, r);
1303 dbg << ')';
1304 return dbg;
1305}
1306#endif
1307
1308/*!
1309 \class QRectF
1310 \inmodule QtCore
1311 \ingroup painting
1312 \reentrant
1313
1314 \brief The QRectF class defines a rectangle in the plane using floating
1315 point precision.
1316
1317 A rectangle is normally expressed as a top-left corner and a
1318 size. The size (width and height) of a QRectF is always equivalent
1319 to the mathematical rectangle that forms the basis for its
1320 rendering.
1321
1322 A QRectF can be constructed with a set of left, top, width and
1323 height coordinates, or from a QPointF and a QSizeF. The following
1324 code creates two identical rectangles.
1325
1326 \snippet code/src_corelib_tools_qrect.cpp 1
1327
1328 There is also a third constructor creating a QRectF from a QRect,
1329 and a corresponding toRect() function that returns a QRect object
1330 based on the values of this rectangle (note that the coordinates
1331 in the returned rectangle are rounded to the nearest integer).
1332
1333 The QRectF class provides a collection of functions that return
1334 the various rectangle coordinates, and enable manipulation of
1335 these. QRectF also provides functions to move the rectangle
1336 relative to the various coordinates. In addition there is a
1337 moveTo() function that moves the rectangle, leaving its top left
1338 corner at the given coordinates. Alternatively, the translate()
1339 function moves the rectangle the given offset relative to the
1340 current position, and the translated() function returns a
1341 translated copy of this rectangle.
1342
1343 The size() function returns the rectange's dimensions as a
1344 QSizeF. The dimensions can also be retrieved separately using the
1345 width() and height() functions. To manipulate the dimensions use
1346 the setSize(), setWidth() or setHeight() functions. Alternatively,
1347 the size can be changed by applying either of the functions
1348 setting the rectangle coordinates, for example, setBottom() or
1349 setRight().
1350
1351 The contains() function tells whether a given point is inside the
1352 rectangle or not, and the intersects() function returns \c true if
1353 this rectangle intersects with a given rectangle (otherwise
1354 false). The QRectF class also provides the intersected() function
1355 which returns the intersection rectangle, and the united() function
1356 which returns the rectangle that encloses the given rectangle and
1357 this:
1358
1359 \table
1360 \row
1361 \li \inlineimage qrect-intersect.png
1362 \li \inlineimage qrect-unite.png
1363 \row
1364 \li intersected()
1365 \li united()
1366 \endtable
1367
1368 The isEmpty() function returns \c true if the rectangle's width or
1369 height is less than, or equal to, 0. Note that an empty rectangle
1370 is not valid: The isValid() function returns \c true if both width
1371 and height is larger than 0. A null rectangle (isNull() == true)
1372 on the other hand, has both width and height set to 0.
1373
1374 Note that due to the way QRect and QRectF are defined, an
1375 empty QRectF is defined in essentially the same way as QRect.
1376
1377 Finally, QRectF objects can be streamed as well as compared.
1378
1379 \tableofcontents
1380
1381 \section1 Rendering
1382
1383 When using an \l {QPainter::Antialiasing}{anti-aliased} painter,
1384 the boundary line of a QRectF will be rendered symmetrically on both
1385 sides of the mathematical rectangle's boundary line. But when
1386 using an aliased painter (the default) other rules apply.
1387
1388 Then, when rendering with a one pixel wide pen the QRectF's boundary
1389 line will be rendered to the right and below the mathematical
1390 rectangle's boundary line.
1391
1392 When rendering with a two pixels wide pen the boundary line will
1393 be split in the middle by the mathematical rectangle. This will be
1394 the case whenever the pen is set to an even number of pixels,
1395 while rendering with a pen with an odd number of pixels, the spare
1396 pixel will be rendered to the right and below the mathematical
1397 rectangle as in the one pixel case.
1398
1399 \table
1400 \row
1401 \li \inlineimage qrect-diagram-zero.png
1402 \li \inlineimage qrectf-diagram-one.png
1403 \row
1404 \li Logical representation
1405 \li One pixel wide pen
1406 \row
1407 \li \inlineimage qrectf-diagram-two.png
1408 \li \inlineimage qrectf-diagram-three.png
1409 \row
1410 \li Two pixel wide pen
1411 \li Three pixel wide pen
1412 \endtable
1413
1414 \section1 Coordinates
1415
1416 The QRectF class provides a collection of functions that return
1417 the various rectangle coordinates, and enable manipulation of
1418 these. QRectF also provides functions to move the rectangle
1419 relative to the various coordinates.
1420
1421 For example: the bottom(), setBottom() and moveBottom() functions:
1422 bottom() returns the y-coordinate of the rectangle's bottom edge,
1423 setBottom() sets the bottom edge of the rectangle to the given y
1424 coordinate (it may change the height, but will never change the
1425 rectangle's top edge) and moveBottom() moves the entire rectangle
1426 vertically, leaving the rectangle's bottom edge at the given y
1427 coordinate and its size unchanged.
1428
1429 \image qrectf-coordinates.png
1430
1431 It is also possible to add offsets to this rectangle's coordinates
1432 using the adjust() function, as well as retrieve a new rectangle
1433 based on adjustments of the original one using the adjusted()
1434 function. If either of the width and height is negative, use the
1435 normalized() function to retrieve a rectangle where the corners
1436 are swapped.
1437
1438 In addition, QRectF provides the getCoords() function which extracts
1439 the position of the rectangle's top-left and bottom-right corner,
1440 and the getRect() function which extracts the rectangle's top-left
1441 corner, width and height. Use the setCoords() and setRect()
1442 function to manipulate the rectangle's coordinates and dimensions
1443 in one go.
1444
1445 \sa QRect, QRegion
1446*/
1447
1448/*****************************************************************************
1449 QRectF member functions
1450 *****************************************************************************/
1451
1452/*!
1453 \fn QRectF::QRectF()
1454
1455 Constructs a null rectangle.
1456
1457 \sa isNull()
1458*/
1459
1460/*!
1461 \fn QRectF::QRectF(const QPointF &topLeft, const QSizeF &size)
1462
1463 Constructs a rectangle with the given \a topLeft corner and the given \a size.
1464
1465 \sa setTopLeft(), setSize()
1466*/
1467
1468/*!
1469 \fn QRectF::QRectF(const QPointF &topLeft, const QPointF &bottomRight)
1470 \since 4.3
1471
1472 Constructs a rectangle with the given \a topLeft and \a bottomRight corners.
1473
1474 \sa setTopLeft(), setBottomRight()
1475*/
1476
1477/*!
1478 \fn QRectF::QRectF(qreal x, qreal y, qreal width, qreal height)
1479
1480 Constructs a rectangle with (\a x, \a y) as its top-left corner
1481 and the given \a width and \a height.
1482
1483 \sa setRect()
1484*/
1485
1486/*!
1487 \fn QRectF::QRectF(const QRect &rectangle)
1488
1489 Constructs a QRectF rectangle from the given QRect \a rectangle.
1490
1491 \sa toRect()
1492*/
1493
1494/*!
1495 \fn bool QRectF::isNull() const
1496
1497 Returns \c true if the rectangle is a null rectangle, otherwise returns \c false.
1498
1499 A null rectangle has both the width and the height set to 0. A
1500 null rectangle is also empty, and hence not valid.
1501
1502 \sa isEmpty(), isValid()
1503*/
1504
1505/*!
1506 \fn bool QRectF::isEmpty() const
1507
1508 Returns \c true if the rectangle is empty, otherwise returns \c false.
1509
1510 An empty rectangle has width() <= 0 or height() <= 0. An empty
1511 rectangle is not valid (i.e., isEmpty() == !isValid()).
1512
1513 Use the normalized() function to retrieve a rectangle where the
1514 corners are swapped.
1515
1516 \sa isNull(), isValid(), normalized()
1517*/
1518
1519/*!
1520 \fn bool QRectF::isValid() const
1521
1522 Returns \c true if the rectangle is valid, otherwise returns \c false.
1523
1524 A valid rectangle has a width() > 0 and height() > 0. Note that
1525 non-trivial operations like intersections are not defined for
1526 invalid rectangles. A valid rectangle is not empty (i.e., isValid()
1527 == !isEmpty()).
1528
1529 \sa isNull(), isEmpty(), normalized()
1530*/
1531
1532
1533/*!
1534 Returns a normalized rectangle; i.e., a rectangle that has a
1535 non-negative width and height.
1536
1537 If width() < 0 the function swaps the left and right corners, and
1538 it swaps the top and bottom corners if height() < 0.
1539
1540 \sa isValid(), isEmpty()
1541*/
1542
1543QRectF QRectF::normalized() const noexcept
1544{
1545 QRectF r = *this;
1546 if (r.w < 0) {
1547 r.xp += r.w;
1548 r.w = -r.w;
1549 }
1550 if (r.h < 0) {
1551 r.yp += r.h;
1552 r.h = -r.h;
1553 }
1554 return r;
1555}
1556
1557/*!
1558 \fn qreal QRectF::x() const
1559
1560 Returns the x-coordinate of the rectangle's left edge. Equivalent
1561 to left().
1562
1563
1564 \sa setX(), y(), topLeft()
1565*/
1566
1567/*!
1568 \fn qreal QRectF::y() const
1569
1570 Returns the y-coordinate of the rectangle's top edge. Equivalent
1571 to top().
1572
1573 \sa setY(), x(), topLeft()
1574*/
1575
1576
1577/*!
1578 \fn void QRectF::setLeft(qreal x)
1579
1580 Sets the left edge of the rectangle to the given \a x
1581 coordinate. May change the width, but will never change the right
1582 edge of the rectangle.
1583
1584 Equivalent to setX().
1585
1586 \sa left(), moveLeft()
1587*/
1588
1589/*!
1590 \fn void QRectF::setTop(qreal y)
1591
1592 Sets the top edge of the rectangle to the given \a y coordinate. May
1593 change the height, but will never change the bottom edge of the
1594 rectangle.
1595
1596 Equivalent to setY().
1597
1598 \sa top(), moveTop()
1599*/
1600
1601/*!
1602 \fn void QRectF::setRight(qreal x)
1603
1604 Sets the right edge of the rectangle to the given \a x
1605 coordinate. May change the width, but will never change the left
1606 edge of the rectangle.
1607
1608 \sa right(), moveRight()
1609*/
1610
1611/*!
1612 \fn void QRectF::setBottom(qreal y)
1613
1614 Sets the bottom edge of the rectangle to the given \a y
1615 coordinate. May change the height, but will never change the top
1616 edge of the rectangle.
1617
1618 \sa bottom(), moveBottom()
1619*/
1620
1621/*!
1622 \fn void QRectF::setX(qreal x)
1623
1624 Sets the left edge of the rectangle to the given \a x
1625 coordinate. May change the width, but will never change the right
1626 edge of the rectangle.
1627
1628 Equivalent to setLeft().
1629
1630 \sa x(), setY(), setTopLeft()
1631*/
1632
1633/*!
1634 \fn void QRectF::setY(qreal y)
1635
1636 Sets the top edge of the rectangle to the given \a y
1637 coordinate. May change the height, but will never change the
1638 bottom edge of the rectangle.
1639
1640 Equivalent to setTop().
1641
1642 \sa y(), setX(), setTopLeft()
1643*/
1644
1645/*!
1646 \fn void QRectF::setTopLeft(const QPointF &position)
1647
1648 Set the top-left corner of the rectangle to the given \a
1649 position. May change the size, but will never change the
1650 bottom-right corner of the rectangle.
1651
1652 \sa topLeft(), moveTopLeft()
1653*/
1654
1655/*!
1656 \fn void QRectF::setBottomRight(const QPointF &position)
1657
1658 Set the bottom-right corner of the rectangle to the given \a
1659 position. May change the size, but will never change the
1660 top-left corner of the rectangle.
1661
1662 \sa bottomRight(), moveBottomRight()
1663*/
1664
1665/*!
1666 \fn void QRectF::setTopRight(const QPointF &position)
1667
1668 Set the top-right corner of the rectangle to the given \a
1669 position. May change the size, but will never change the
1670 bottom-left corner of the rectangle.
1671
1672 \sa topRight(), moveTopRight()
1673*/
1674
1675/*!
1676 \fn void QRectF::setBottomLeft(const QPointF &position)
1677
1678 Set the bottom-left corner of the rectangle to the given \a
1679 position. May change the size, but will never change the
1680 top-right corner of the rectangle.
1681
1682 \sa bottomLeft(), moveBottomLeft()
1683*/
1684
1685/*!
1686 \fn QPointF QRectF::center() const
1687
1688 Returns the center point of the rectangle.
1689
1690 \sa moveCenter()
1691*/
1692
1693
1694/*!
1695 \fn void QRectF::getRect(qreal *x, qreal *y, qreal *width, qreal *height) const
1696
1697 Extracts the position of the rectangle's top-left corner to *\a x and
1698 *\a y, and its dimensions to *\a width and *\a height.
1699
1700 \sa setRect(), getCoords()
1701*/
1702
1703
1704/*!
1705 \fn void QRectF::getCoords(qreal *x1, qreal *y1, qreal *x2, qreal *y2) const
1706
1707 Extracts the position of the rectangle's top-left corner to *\a x1
1708 and *\a y1, and the position of the bottom-right corner to *\a x2 and
1709 *\a y2.
1710
1711 \sa setCoords(), getRect()
1712*/
1713
1714/*!
1715 \fn void QRectF::moveLeft(qreal x)
1716
1717 Moves the rectangle horizontally, leaving the rectangle's left
1718 edge at the given \a x coordinate. The rectangle's size is
1719 unchanged.
1720
1721 \sa left(), setLeft(), moveRight()
1722*/
1723
1724/*!
1725 \fn void QRectF::moveTop(qreal y)
1726
1727 Moves the rectangle vertically, leaving the rectangle's top line
1728 at the given \a y coordinate. The rectangle's size is unchanged.
1729
1730 \sa top(), setTop(), moveBottom()
1731*/
1732
1733
1734/*!
1735 \fn void QRectF::moveRight(qreal x)
1736
1737 Moves the rectangle horizontally, leaving the rectangle's right
1738 edge at the given \a x coordinate. The rectangle's size is
1739 unchanged.
1740
1741 \sa right(), setRight(), moveLeft()
1742*/
1743
1744
1745/*!
1746 \fn void QRectF::moveBottom(qreal y)
1747
1748 Moves the rectangle vertically, leaving the rectangle's bottom
1749 edge at the given \a y coordinate. The rectangle's size is
1750 unchanged.
1751
1752 \sa bottom(), setBottom(), moveTop()
1753*/
1754
1755
1756/*!
1757 \fn void QRectF::moveTopLeft(const QPointF &position)
1758
1759 Moves the rectangle, leaving the top-left corner at the given \a
1760 position. The rectangle's size is unchanged.
1761
1762 \sa setTopLeft(), moveTop(), moveLeft()
1763*/
1764
1765
1766/*!
1767 \fn void QRectF::moveBottomRight(const QPointF &position)
1768
1769 Moves the rectangle, leaving the bottom-right corner at the given
1770 \a position. The rectangle's size is unchanged.
1771
1772 \sa setBottomRight(), moveBottom(), moveRight()
1773*/
1774
1775
1776/*!
1777 \fn void QRectF::moveTopRight(const QPointF &position)
1778
1779 Moves the rectangle, leaving the top-right corner at the given
1780 \a position. The rectangle's size is unchanged.
1781
1782 \sa setTopRight(), moveTop(), moveRight()
1783*/
1784
1785
1786/*!
1787 \fn void QRectF::moveBottomLeft(const QPointF &position)
1788
1789 Moves the rectangle, leaving the bottom-left corner at the given
1790 \a position. The rectangle's size is unchanged.
1791
1792 \sa setBottomLeft(), moveBottom(), moveLeft()
1793*/
1794
1795
1796/*!
1797 \fn void QRectF::moveTo(qreal x, qreal y)
1798
1799 Moves the rectangle, leaving the top-left corner at the given
1800 position (\a x, \a y). The rectangle's size is unchanged.
1801
1802 \sa translate(), moveTopLeft()
1803*/
1804
1805/*!
1806 \fn void QRectF::moveTo(const QPointF &position)
1807 \overload
1808
1809 Moves the rectangle, leaving the top-left corner at the given \a
1810 position.
1811*/
1812
1813/*!
1814 \fn void QRectF::translate(qreal dx, qreal dy)
1815
1816 Moves the rectangle \a dx along the x-axis and \a dy along the y-axis,
1817 relative to the current position. Positive values move the rectangle to the
1818 right and downwards.
1819
1820 \sa moveTopLeft(), moveTo(), translated()
1821*/
1822
1823
1824/*!
1825 \fn void QRectF::translate(const QPointF &offset)
1826 \overload
1827
1828 Moves the rectangle \a{offset}.\l{QPointF::x()}{x()} along the x
1829 axis and \a{offset}.\l{QPointF::y()}{y()} along the y axis,
1830 relative to the current position.
1831*/
1832
1833
1834/*!
1835 \fn QRectF QRectF::translated(qreal dx, qreal dy) const
1836
1837 Returns a copy of the rectangle that is translated \a dx along the
1838 x axis and \a dy along the y axis, relative to the current
1839 position. Positive values move the rectangle to the right and
1840 down.
1841
1842 \sa translate()
1843*/
1844
1845
1846/*!
1847 \fn QRectF QRectF::translated(const QPointF &offset) const
1848 \overload
1849
1850 Returns a copy of the rectangle that is translated
1851 \a{offset}.\l{QPointF::x()}{x()} along the x axis and
1852 \a{offset}.\l{QPointF::y()}{y()} along the y axis, relative to the
1853 current position.
1854*/
1855
1856/*!
1857 \fn QRectF QRectF::transposed() const
1858 \since 5.7
1859
1860 Returns a copy of the rectangle that has its width and height
1861 exchanged:
1862
1863 \snippet code/src_corelib_tools_qrect.cpp 3
1864
1865 \sa QSizeF::transposed()
1866*/
1867
1868/*!
1869 \fn void QRectF::setRect(qreal x, qreal y, qreal width, qreal height)
1870
1871 Sets the coordinates of the rectangle's top-left corner to (\a x,
1872 \a y), and its size to the given \a width and \a height.
1873
1874 \sa getRect(), setCoords()
1875*/
1876
1877
1878/*!
1879 \fn void QRectF::setCoords(qreal x1, qreal y1, qreal x2, qreal y2)
1880
1881 Sets the coordinates of the rectangle's top-left corner to (\a x1,
1882 \a y1), and the coordinates of its bottom-right corner to (\a x2,
1883 \a y2).
1884
1885 \sa getCoords(), setRect()
1886*/
1887
1888/*!
1889 \fn QRectF QRectF::adjusted(qreal dx1, qreal dy1, qreal dx2, qreal dy2) const
1890
1891 Returns a new rectangle with \a dx1, \a dy1, \a dx2 and \a dy2
1892 added respectively to the existing coordinates of this rectangle.
1893
1894 \sa adjust()
1895*/
1896
1897/*! \fn void QRectF::adjust(qreal dx1, qreal dy1, qreal dx2, qreal dy2)
1898
1899 Adds \a dx1, \a dy1, \a dx2 and \a dy2 respectively to the
1900 existing coordinates of the rectangle.
1901
1902 \sa adjusted(), setRect()
1903*/
1904/*!
1905 \fn QSizeF QRectF::size() const
1906
1907 Returns the size of the rectangle.
1908
1909 \sa setSize(), width(), height()
1910*/
1911
1912/*!
1913 \fn qreal QRectF::width() const
1914
1915 Returns the width of the rectangle.
1916
1917 \sa setWidth(), height(), size()
1918*/
1919
1920/*!
1921 \fn qreal QRectF::height() const
1922
1923 Returns the height of the rectangle.
1924
1925 \sa setHeight(), width(), size()
1926*/
1927
1928/*!
1929 \fn void QRectF::setWidth(qreal width)
1930
1931 Sets the width of the rectangle to the given \a width. The right
1932 edge is changed, but not the left one.
1933
1934 \sa width(), setSize()
1935*/
1936
1937
1938/*!
1939 \fn void QRectF::setHeight(qreal height)
1940
1941 Sets the height of the rectangle to the given \a height. The bottom
1942 edge is changed, but not the top one.
1943
1944 \sa height(), setSize()
1945*/
1946
1947
1948/*!
1949 \fn void QRectF::setSize(const QSizeF &size)
1950
1951 Sets the size of the rectangle to the given \a size. The top-left
1952 corner is not moved.
1953
1954 \sa size(), setWidth(), setHeight()
1955*/
1956
1957
1958/*!
1959 \fn bool QRectF::contains(const QPointF &point) const
1960
1961 Returns \c true if the given \a point is inside or on the edge of the
1962 rectangle; otherwise returns \c false.
1963
1964 \sa intersects()
1965*/
1966
1967bool QRectF::contains(const QPointF &p) const noexcept
1968{
1969 qreal l = xp;
1970 qreal r = xp;
1971 if (w < 0)
1972 l += w;
1973 else
1974 r += w;
1975 if (l == r) // null rect
1976 return false;
1977
1978 if (p.x() < l || p.x() > r)
1979 return false;
1980
1981 qreal t = yp;
1982 qreal b = yp;
1983 if (h < 0)
1984 t += h;
1985 else
1986 b += h;
1987 if (t == b) // null rect
1988 return false;
1989
1990 if (p.y() < t || p.y() > b)
1991 return false;
1992
1993 return true;
1994}
1995
1996
1997/*!
1998 \fn bool QRectF::contains(qreal x, qreal y) const
1999 \overload
2000
2001 Returns \c true if the point (\a x, \a y) is inside or on the edge of
2002 the rectangle; otherwise returns \c false.
2003*/
2004
2005/*!
2006 \fn bool QRectF::contains(const QRectF &rectangle) const
2007 \overload
2008
2009 Returns \c true if the given \a rectangle is inside this rectangle;
2010 otherwise returns \c false.
2011*/
2012
2013bool QRectF::contains(const QRectF &r) const noexcept
2014{
2015 qreal l1 = xp;
2016 qreal r1 = xp;
2017 if (w < 0)
2018 l1 += w;
2019 else
2020 r1 += w;
2021 if (l1 == r1) // null rect
2022 return false;
2023
2024 qreal l2 = r.xp;
2025 qreal r2 = r.xp;
2026 if (r.w < 0)
2027 l2 += r.w;
2028 else
2029 r2 += r.w;
2030 if (l2 == r2) // null rect
2031 return false;
2032
2033 if (l2 < l1 || r2 > r1)
2034 return false;
2035
2036 qreal t1 = yp;
2037 qreal b1 = yp;
2038 if (h < 0)
2039 t1 += h;
2040 else
2041 b1 += h;
2042 if (t1 == b1) // null rect
2043 return false;
2044
2045 qreal t2 = r.yp;
2046 qreal b2 = r.yp;
2047 if (r.h < 0)
2048 t2 += r.h;
2049 else
2050 b2 += r.h;
2051 if (t2 == b2) // null rect
2052 return false;
2053
2054 if (t2 < t1 || b2 > b1)
2055 return false;
2056
2057 return true;
2058}
2059
2060/*!
2061 \fn qreal QRectF::left() const
2062
2063 Returns the x-coordinate of the rectangle's left edge. Equivalent
2064 to x().
2065
2066 \sa setLeft(), topLeft(), bottomLeft()
2067*/
2068
2069/*!
2070 \fn qreal QRectF::top() const
2071
2072 Returns the y-coordinate of the rectangle's top edge. Equivalent
2073 to y().
2074
2075 \sa setTop(), topLeft(), topRight()
2076*/
2077
2078/*!
2079 \fn qreal QRectF::right() const
2080
2081 Returns the x-coordinate of the rectangle's right edge.
2082
2083 \sa setRight(), topRight(), bottomRight()
2084*/
2085
2086/*!
2087 \fn qreal QRectF::bottom() const
2088
2089 Returns the y-coordinate of the rectangle's bottom edge.
2090
2091 \sa setBottom(), bottomLeft(), bottomRight()
2092*/
2093
2094/*!
2095 \fn QPointF QRectF::topLeft() const
2096
2097 Returns the position of the rectangle's top-left corner.
2098
2099 \sa setTopLeft(), top(), left()
2100*/
2101
2102/*!
2103 \fn QPointF QRectF::bottomRight() const
2104
2105 Returns the position of the rectangle's bottom-right corner.
2106
2107 \sa setBottomRight(), bottom(), right()
2108*/
2109
2110/*!
2111 \fn QPointF QRectF::topRight() const
2112
2113 Returns the position of the rectangle's top-right corner.
2114
2115 \sa setTopRight(), top(), right()
2116*/
2117
2118/*!
2119 \fn QPointF QRectF::bottomLeft() const
2120
2121 Returns the position of the rectangle's bottom-left corner.
2122
2123 \sa setBottomLeft(), bottom(), left()
2124*/
2125
2126/*!
2127 \fn QRectF& QRectF::operator|=(const QRectF &rectangle)
2128
2129 Unites this rectangle with the given \a rectangle.
2130
2131 \sa united(), operator|()
2132*/
2133
2134/*!
2135 \fn QRectF& QRectF::operator&=(const QRectF &rectangle)
2136
2137 Intersects this rectangle with the given \a rectangle.
2138
2139 \sa intersected(), operator|=()
2140*/
2141
2142
2143/*!
2144 \fn QRectF QRectF::operator|(const QRectF &rectangle) const
2145
2146 Returns the bounding rectangle of this rectangle and the given \a rectangle.
2147
2148 \sa united(), operator|=()
2149*/
2150
2151QRectF QRectF::operator|(const QRectF &r) const noexcept
2152{
2153 if (isNull())
2154 return r;
2155 if (r.isNull())
2156 return *this;
2157
2158 qreal left = xp;
2159 qreal right = xp;
2160 if (w < 0)
2161 left += w;
2162 else
2163 right += w;
2164
2165 if (r.w < 0) {
2166 left = qMin(left, r.xp + r.w);
2167 right = qMax(right, r.xp);
2168 } else {
2169 left = qMin(left, r.xp);
2170 right = qMax(right, r.xp + r.w);
2171 }
2172
2173 qreal top = yp;
2174 qreal bottom = yp;
2175 if (h < 0)
2176 top += h;
2177 else
2178 bottom += h;
2179
2180 if (r.h < 0) {
2181 top = qMin(top, r.yp + r.h);
2182 bottom = qMax(bottom, r.yp);
2183 } else {
2184 top = qMin(top, r.yp);
2185 bottom = qMax(bottom, r.yp + r.h);
2186 }
2187
2188 return QRectF(left, top, right - left, bottom - top);
2189}
2190
2191/*!
2192 \fn QRectF QRectF::unite(const QRectF &rectangle) const
2193 \obsolete
2194
2195 Use united(\a rectangle) instead.
2196*/
2197
2198/*!
2199 \fn QRectF QRectF::united(const QRectF &rectangle) const
2200 \since 4.2
2201
2202 Returns the bounding rectangle of this rectangle and the given \a
2203 rectangle.
2204
2205 \image qrect-unite.png
2206
2207 \sa intersected()
2208*/
2209
2210
2211/*!
2212 \fn QRectF QRectF::operator &(const QRectF &rectangle) const
2213
2214 Returns the intersection of this rectangle and the given \a
2215 rectangle. Returns an empty rectangle if there is no intersection.
2216
2217 \sa operator&=(), intersected()
2218*/
2219
2220QRectF QRectF::operator&(const QRectF &r) const noexcept
2221{
2222 qreal l1 = xp;
2223 qreal r1 = xp;
2224 if (w < 0)
2225 l1 += w;
2226 else
2227 r1 += w;
2228 if (l1 == r1) // null rect
2229 return QRectF();
2230
2231 qreal l2 = r.xp;
2232 qreal r2 = r.xp;
2233 if (r.w < 0)
2234 l2 += r.w;
2235 else
2236 r2 += r.w;
2237 if (l2 == r2) // null rect
2238 return QRectF();
2239
2240 if (l1 >= r2 || l2 >= r1)
2241 return QRectF();
2242
2243 qreal t1 = yp;
2244 qreal b1 = yp;
2245 if (h < 0)
2246 t1 += h;
2247 else
2248 b1 += h;
2249 if (t1 == b1) // null rect
2250 return QRectF();
2251
2252 qreal t2 = r.yp;
2253 qreal b2 = r.yp;
2254 if (r.h < 0)
2255 t2 += r.h;
2256 else
2257 b2 += r.h;
2258 if (t2 == b2) // null rect
2259 return QRectF();
2260
2261 if (t1 >= b2 || t2 >= b1)
2262 return QRectF();
2263
2264 QRectF tmp;
2265 tmp.xp = qMax(l1, l2);
2266 tmp.yp = qMax(t1, t2);
2267 tmp.w = qMin(r1, r2) - tmp.xp;
2268 tmp.h = qMin(b1, b2) - tmp.yp;
2269 return tmp;
2270}
2271
2272/*!
2273 \fn QRectF QRectF::intersect(const QRectF &rectangle) const
2274 \obsolete
2275
2276 Use intersected(\a rectangle) instead.
2277*/
2278
2279/*!
2280 \fn QRectF QRectF::intersected(const QRectF &rectangle) const
2281 \since 4.2
2282
2283 Returns the intersection of this rectangle and the given \a
2284 rectangle. Note that \c {r.intersected(s)} is equivalent to \c
2285 {r & s}.
2286
2287 \image qrect-intersect.png
2288
2289 \sa intersects(), united(), operator&=()
2290*/
2291
2292/*!
2293 \fn bool QRectF::intersects(const QRectF &rectangle) const
2294
2295 Returns \c true if this rectangle intersects with the given \a
2296 rectangle (i.e. there is a non-empty area of overlap between
2297 them), otherwise returns \c false.
2298
2299 The intersection rectangle can be retrieved using the intersected()
2300 function.
2301
2302 \sa contains()
2303*/
2304
2305bool QRectF::intersects(const QRectF &r) const noexcept
2306{
2307 qreal l1 = xp;
2308 qreal r1 = xp;
2309 if (w < 0)
2310 l1 += w;
2311 else
2312 r1 += w;
2313 if (l1 == r1) // null rect
2314 return false;
2315
2316 qreal l2 = r.xp;
2317 qreal r2 = r.xp;
2318 if (r.w < 0)
2319 l2 += r.w;
2320 else
2321 r2 += r.w;
2322 if (l2 == r2) // null rect
2323 return false;
2324
2325 if (l1 >= r2 || l2 >= r1)
2326 return false;
2327
2328 qreal t1 = yp;
2329 qreal b1 = yp;
2330 if (h < 0)
2331 t1 += h;
2332 else
2333 b1 += h;
2334 if (t1 == b1) // null rect
2335 return false;
2336
2337 qreal t2 = r.yp;
2338 qreal b2 = r.yp;
2339 if (r.h < 0)
2340 t2 += r.h;
2341 else
2342 b2 += r.h;
2343 if (t2 == b2) // null rect
2344 return false;
2345
2346 if (t1 >= b2 || t2 >= b1)
2347 return false;
2348
2349 return true;
2350}
2351
2352/*!
2353 \fn QRect QRectF::toRect() const
2354
2355 Returns a QRect based on the values of this rectangle. Note that the
2356 coordinates in the returned rectangle are rounded to the nearest integer.
2357
2358 \sa QRectF(), toAlignedRect()
2359*/
2360
2361/*!
2362 \fn QRect QRectF::toAlignedRect() const
2363 \since 4.3
2364
2365 Returns a QRect based on the values of this rectangle that is the
2366 smallest possible integer rectangle that completely contains this
2367 rectangle.
2368
2369 \sa toRect()
2370*/
2371
2372QRect QRectF::toAlignedRect() const noexcept
2373{
2374 int xmin = int(qFloor(xp));
2375 int xmax = int(qCeil(xp + w));
2376 int ymin = int(qFloor(yp));
2377 int ymax = int(qCeil(yp + h));
2378 return QRect(xmin, ymin, xmax - xmin, ymax - ymin);
2379}
2380
2381/*!
2382 \fn void QRectF::moveCenter(const QPointF &position)
2383
2384 Moves the rectangle, leaving the center point at the given \a
2385 position. The rectangle's size is unchanged.
2386
2387 \sa center()
2388*/
2389
2390/*!
2391 \fn bool operator==(const QRectF &r1, const QRectF &r2)
2392 \relates QRectF
2393
2394 Returns \c true if the rectangles \a r1 and \a r2 are equal,
2395 otherwise returns \c false.
2396*/
2397
2398
2399/*!
2400 \fn bool operator!=(const QRectF &r1, const QRectF &r2)
2401 \relates QRectF
2402
2403 Returns \c true if the rectangles \a r1 and \a r2 are different, otherwise
2404 returns \c false.
2405*/
2406
2407/*!
2408 \fn QRectF operator+(const QRectF &lhs, const QMarginsF &rhs)
2409 \relates QRectF
2410 \since 5.3
2411
2412 Returns the \a lhs rectangle grown by the \a rhs margins.
2413*/
2414
2415/*!
2416 \fn QRectF operator-(const QRectF &lhs, const QMarginsF &rhs)
2417 \relates QRectF
2418 \since 5.3
2419
2420 Returns the \a lhs rectangle shrunk by the \a rhs margins.
2421*/
2422
2423/*!
2424 \fn QRectF operator+(const QMarginsF &lhs, const QRectF &rhs)
2425 \relates QRectF
2426 \overload
2427 \since 5.3
2428
2429 Returns the \a lhs rectangle grown by the \a rhs margins.
2430*/
2431
2432/*!
2433 \fn QRectF QRectF::marginsAdded(const QMarginsF &margins) const
2434 \since 5.3
2435
2436 Returns a rectangle grown by the \a margins.
2437
2438 \sa operator+=(), marginsRemoved(), operator-=()
2439*/
2440
2441/*!
2442 \fn QRectF QRectF::marginsRemoved(const QMarginsF &margins) const
2443 \since 5.3
2444
2445 Removes the \a margins from the rectangle, shrinking it.
2446
2447 \sa marginsAdded(), operator+=(), operator-=()
2448*/
2449
2450/*!
2451 \fn QRectF QRectF::operator+=(const QMarginsF &margins)
2452 \since 5.3
2453
2454 Adds the \a margins to the rectangle, growing it.
2455
2456 \sa marginsAdded(), marginsRemoved(), operator-=()
2457*/
2458
2459/*!
2460 \fn QRectF QRectF::operator-=(const QMarginsF &margins)
2461 \since 5.3
2462
2463 Returns a rectangle shrunk by the \a margins.
2464
2465 \sa marginsRemoved(), operator+=(), marginsAdded()
2466*/
2467
2468/*****************************************************************************
2469 QRectF stream functions
2470 *****************************************************************************/
2471#ifndef QT_NO_DATASTREAM
2472/*!
2473 \fn QDataStream &operator<<(QDataStream &stream, const QRectF &rectangle)
2474
2475 \relates QRectF
2476
2477 Writes the \a rectangle to the \a stream, and returns a reference to the
2478 stream.
2479
2480 \sa {Serializing Qt Data Types}
2481*/
2482
2483QDataStream &operator<<(QDataStream &s, const QRectF &r)
2484{
2485 s << double(r.x()) << double(r.y()) << double(r.width()) << double(r.height());
2486 return s;
2487}
2488
2489/*!
2490 \fn QDataStream &operator>>(QDataStream &stream, QRectF &rectangle)
2491
2492 \relates QRectF
2493
2494 Reads a \a rectangle from the \a stream, and returns a reference to the
2495 stream.
2496
2497 \sa {Serializing Qt Data Types}
2498*/
2499
2500QDataStream &operator>>(QDataStream &s, QRectF &r)
2501{
2502 double x, y, w, h;
2503 s >> x;
2504 s >> y;
2505 s >> w;
2506 s >> h;
2507 r.setRect(qreal(x), qreal(y), qreal(w), qreal(h));
2508 return s;
2509}
2510
2511#endif // QT_NO_DATASTREAM
2512
2513
2514#ifndef QT_NO_DEBUG_STREAM
2515QDebug operator<<(QDebug dbg, const QRectF &r)
2516{
2517 QDebugStateSaver saver(dbg);
2518 dbg.nospace();
2519 dbg << "QRectF" << '(';
2520 QtDebugUtils::formatQRect(dbg, r);
2521 dbg << ')';
2522 return dbg;
2523}
2524#endif
2525
2526QT_END_NAMESPACE
2527