QLinearGradient and QPainter : QPainter « Qt « C++

1. C++
2. Qt
3. QPainter

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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