我想在QWidget中绘制一些菱形并自动保存为图像。我在paintEvent中使用以下代码,但出现错误“QWidget :: repaint:检测到递归重绘”。问题是render()似乎再次调用paintEvent(),我总是陷入无限的递归paintEvent调用中。是否有任何方法在绘制后自动保存qwidget?任何建议将不胜感激。
void Dialog::paintEvent(QPaintEvent *e) {
QPainter painter(this);
QRect background(0,0,this->geometry().width(),this->geometry().height());
painter.setBrush( QBrush( Qt::white ) );
painter.setPen( Qt::NoPen );
//QBrush bbrush(Qt::black,Qt::SolidPattern);
painter.drawRect(background);
int width = this->geometry().width();
int height = this->geometry().height();
int rec_size=64;
int rows=floor((double)height/(double)rec_size);
int cols=floor((double)width/(double)rec_size);
QPointF points[4];
for (int i=0;i<floor(rows);i++){
for (int j=0;j<floor(cols);j++){
painter.setBrush( QBrush( colors[rand() % color_size] ) );
points[0] = QPointF(rec_size*(j),rec_size*(i+0.5));
points[1] = QPointF(rec_size*(j+0.5),rec_size*(i));
points[2] = QPointF(rec_size*(j+1),rec_size*(i+0.5));
points[3] = QPointF(rec_size*(j+0.5),rec_size*(i+1));
painter.drawPolygon(points, 4);
}
}
QPixmap pixmap(this->size());
this->render(&pixmap);
pixmap.save("test.png");
}