问题描述
此Qt 显示了如何调整图像大小包含在对话框中,以便在调整对话框大小时,图像会相应地延伸。
This Qt example shows how to resize an image contained in a dialog, so that when the dialog is resized, the image stretches accordingly.
如何以相同的方式调整图像大小,而不会扭曲图像/保持其比例相同?
How can I resize an image in the same way, without distorting it / keeping its proportions the same?
当然如果对话框的宽高比与图像不同,我会得到一个灰色区域。
我找到了 Qt :: KeepAspectRatio
枚举,但不是与其一起使用的功能。
Of course if the width/height ratio of the dialog is different from the one of the image, I will get a "grey" area.
I found the Qt::KeepAspectRatio
enum, but not the function to use it with.
更新:这是我正在尝试的代码:
Update: This is the code I am trying with:
QImage image(path);
QImage image2 = image.scaled(200, 200, Qt::KeepAspectRatio);
QLabel *plotImg = new QLabel;
plotImg->setScaledContents(true);
plotImg->setPixmap(QPixmap::fromImage(image2));
调整标签大小时,图像不会保持恒定的宽高比。并且在重新缩放后它会失去解决方案。
The image does not maintain a constant aspect ratio when the label is resized. And it looses resolution after the rescaling.
推荐答案
使用功能。
QImage img("someimage.png");
QImage img2 = img.scaled(100, 100, Qt::KeepAspectRatio);
如果您需要 QPixmap
, 。
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