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50
51#include "widget.h"
52#include "helper.h"
53
54#include <QPainter>
55#include <QTimer>
56
57//! [0]
58Widget::Widget(Helper *helper, QWidget *parent)
59 : QWidget(parent), helper(helper)
60{
61 elapsed = 0;
62 setFixedSize(w: 200, h: 200);
63}
64//! [0]
65
66//! [1]
67void Widget::animate()
68{
69 elapsed = (elapsed + qobject_cast<QTimer*>(object: sender())->interval()) % 1000;
70 update();
71}
72//! [1]
73
74//! [2]
75void Widget::paintEvent(QPaintEvent *event)
76{
77 QPainter painter;
78 painter.begin(this);
79 painter.setRenderHint(hint: QPainter::Antialiasing);
80 helper->paint(painter: &painter, event, elapsed);
81 painter.end();
82}
83//! [2]
84

source code of qtbase/examples/opengl/2dpainting/widget.cpp