python自适应图片大小_pixmap和label设置图片自适应大小

在label中添加pixmap来显示图片时，当图片过大时图片显示不全。

1.这时可以使用pixmap的scared()方法，来设置图片缩放。

QPixmap QPixmap.scaled (self, int w, int h, Qt.AspectRatioMode aspectMode = Qt.IgnoreAspectRatio, Qt.TransformationMode mode = Qt.FastTransformation)

Scales the pixmap to the given size, using the aspect ratio and transformation modes specified by aspectRatioMode and transformMode.

If aspectRatioMode is Qt.IgnoreAspectRatio, the pixmap is scaled to size.

If aspectRatioMode is Qt.KeepAspectRatio, the pixmap is scaled to a rectangle as large as possible inside size, preserving the aspect ratio.

If aspectRatioMode is Qt.KeepAspectRatioByExpanding, the pixmap is scaled to a rectangle as small as possible outside size, preserving the aspect ratio.

If the given size is empty, this function returns a null pixmap.

In some cases it can be more beneficial to draw the pixmap to a painter with a scale