使用QT画带有透明效果的图

分辨率：24X24

最大圆

 代码:

#include <QApplication>
#include <QImage>
#include <QPainter>int main(int argc, char *argv[])
{QImage image(QSize(24,24),QImage::Format_ARGB32);image.fill(QColor(0,0,0,0));QPainter paint(&image);QRectF rect = image.rect();paint.setPen(QColor(255,255,255,0));paint.setBrush(QColor(255,255,255,255));paint.drawEllipse(rect);image.save("sun.png");return 0;
}

效果：

半径减一半

#include <QApplication>
#include <QImage>
#include <QPainter>
#include <QRect>
int main()
{QImage image(QSize(24,24),QImage::Format_ARGB32);image.fill(QColor(0,0,0,0));QPainter paint(&image);QRectF rect = image.rect();paint.setPen(QColor(255,255,255,0));paint.setBrush(QColor(255,255,255,255));// paint.drawEllipse(rect);paint.drawEllipse(rect.center().toPoint(),6,6);image.save("sun.png");return 0;
}