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50 | |
51 | #include "wigglywidget.h" |
52 | |
53 | #include <QFontMetrics> |
54 | #include <QPainter> |
55 | #include <QTimerEvent> |
56 | |
57 | //! [0] |
58 | WigglyWidget::WigglyWidget(QWidget *parent) |
59 | : QWidget(parent), step(0) |
60 | { |
61 | setBackgroundRole(QPalette::Midlight); |
62 | setAutoFillBackground(true); |
63 | |
64 | QFont newFont = font(); |
65 | newFont.setPointSize(newFont.pointSize() + 20); |
66 | setFont(newFont); |
67 | |
68 | timer.start(msec: 60, obj: this); |
69 | } |
70 | //! [0] |
71 | |
72 | //! [1] |
73 | void WigglyWidget::paintEvent(QPaintEvent * /* event */) |
74 | //! [1] //! [2] |
75 | { |
76 | static constexpr int sineTable[16] = { |
77 | 0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38 |
78 | }; |
79 | |
80 | QFontMetrics metrics(font()); |
81 | int x = (width() - metrics.horizontalAdvance(text)) / 2; |
82 | int y = (height() + metrics.ascent() - metrics.descent()) / 2; |
83 | QColor color; |
84 | //! [2] |
85 | |
86 | //! [3] |
87 | QPainter painter(this); |
88 | //! [3] //! [4] |
89 | for (int i = 0; i < text.size(); ++i) { |
90 | int index = (step + i) % 16; |
91 | color.setHsv(h: (15 - index) * 16, s: 255, v: 191); |
92 | painter.setPen(color); |
93 | painter.drawText(x, y: y - ((sineTable[index] * metrics.height()) / 400), |
94 | s: QString(text[i])); |
95 | x += metrics.horizontalAdvance(text[i]); |
96 | } |
97 | } |
98 | //! [4] |
99 | |
100 | //! [5] |
101 | void WigglyWidget::timerEvent(QTimerEvent *event) |
102 | //! [5] //! [6] |
103 | { |
104 | if (event->timerId() == timer.timerId()) { |
105 | ++step; |
106 | update(); |
107 | } else { |
108 | QWidget::timerEvent(event); |
109 | } |
110 | //! [6] |
111 | } |
112 | |