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50
51#ifndef SCRIBBLEAREA_H
52#define SCRIBBLEAREA_H
53
54#include <QColor>
55#include <QImage>
56#include <QPoint>
57#include <QWidget>
58
59//! [0]
60class ScribbleArea : public QWidget
61{
62 Q_OBJECT
63
64public:
65 ScribbleArea(QWidget *parent = nullptr);
66
67 bool openImage(const QString &fileName);
68 bool saveImage(const QString &fileName, const char *fileFormat);
69 void setPenColor(const QColor &newColor);
70 void setPenWidth(int newWidth);
71
72 bool isModified() const { return modified; }
73 QColor penColor() const { return myPenColor; }
74 int penWidth() const { return myPenWidth; }
75
76public slots:
77 void clearImage();
78 void print();
79
80protected:
81 void mousePressEvent(QMouseEvent *event) override;
82 void mouseMoveEvent(QMouseEvent *event) override;
83 void mouseReleaseEvent(QMouseEvent *event) override;
84 void paintEvent(QPaintEvent *event) override;
85 void resizeEvent(QResizeEvent *event) override;
86
87private:
88 void drawLineTo(const QPoint &endPoint);
89 void resizeImage(QImage *image, const QSize &newSize);
90
91 bool modified = false;
92 bool scribbling = false;
93 int myPenWidth = 1;
94 QColor myPenColor = Qt::blue;
95 QImage image;
96 QPoint lastPoint;
97};
98//! [0]
99
100#endif
101

source code of qtbase/examples/widgets/widgets/scribble/scribblearea.h