Qt 根据Label大小无形变的自适应居中显示图像

效果图:

Qt 根据Label大小无形变的自适应居中显示图像_第1张图片Qt 根据Label大小无形变的自适应居中显示图像_第2张图片

实现代码:

	QImage ScaleImage2Label(QImage qImage, QLabel* qLabel)
	{
		QImage qScaledImage;
		QSize qImageSize = qImage.size();
		QSize qLabelSize = qLabel->size();
		double dWidthRatio = 1.0*qImageSize.width() / qLabelSize.width();
		double dHeightRatio = 1.0*qImageSize.height() / qLabelSize.height();
		if (dWidthRatio>dHeightRatio)
		{
			qScaledImage = qImage.scaledToWidth(qLabelSize.width());
		}
		else
		{
			qScaledImage = qImage.scaledToHeight(qLabelSize.height());
		}
		return qScaledImage;
	}

调用代码:

		QImage *qImage = new QImage(qImagePath);
		QImage qScaledImage = ScaleImage2Label(*qImage,ui.label);
		ui.label->setPixmap(QPixmap::fromImage(qScaledImage));
		ui.label->setAlignment(Qt::AlignCenter);
		//ui.label->resize(ui.label->pixmap()->size());
		ui.label->show();

参考: http://www.kuqin.com/qtdocument/qimage.html#ScaleMode-enum


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