Mega Code Archive
QLinearGradient and QPainter
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#ifndef PAINTWIDGET_H
#define PAINTWIDGET_H
#include <QWidget>
class QPaintEvent;
class PaintWidget : public QWidget
{
Q_OBJECT
public:
PaintWidget(QWidget *parent = 0);
protected:
void paintEvent(QPaintEvent *event);
};
#endif
#include <QtGui>
#include "paintwidget.h"
PaintWidget::PaintWidget(QWidget *parent)
: QWidget(parent)
{
}
void PaintWidget::paintEvent(QPaintEvent *event)
{
QLinearGradient gradient1(rect().topLeft(), rect().bottomRight());
gradient1.setColorAt(0, QColor("#ffffcc"));
gradient1.setColorAt(1, QColor("#ccccff"));
QRectF ellipseRect(width()*0.25, height()*0.25, width()*0.5, height()*0.5);
QLinearGradient gradient2(ellipseRect.topLeft(), ellipseRect.bottomRight());
gradient2.setColorAt(0, QColor("#ccccff"));
gradient2.setColorAt(1, QColor("#ffffcc"));
QPainter painter;
painter.begin(this);
painter.setRenderHint(QPainter::Antialiasing);
painter.fillRect(rect(), QBrush(gradient1));
painter.setBrush(QBrush(gradient2));
painter.drawEllipse(ellipseRect);
painter.end();
}
#include <QtGui>
#include "paintwidget.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
PaintWidget window;
window.show();
return app.exec();
}
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