qt5base-lts/examples/opengl/2dpainting/widget.cpp

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#include "widget.h"
#include "helper.h"

#include <QPainter>
#include <QTimer>

//! [0]
Widget::Widget(Helper *helper, QWidget *parent)
    : QWidget(parent), helper(helper)
{
    elapsed = 0;
    setFixedSize(200, 200);
}
//! [0]

//! [1]
void Widget::animate()
{
    elapsed = (elapsed + qobject_cast<QTimer*>(sender())->interval()) % 1000;
    update();
}
//! [1]

//! [2]
void Widget::paintEvent(QPaintEvent *event)
{
    QPainter painter;
    painter.begin(this);
    painter.setRenderHint(QPainter::Antialiasing);
    helper->paint(&painter, event, elapsed);
    painter.end();
}
//! [2]