c++ - qt中使用图片不能铺满窗口

Question

我尝试在窗口中添加图片并且铺满窗口，

但是在实际运行过程中显示成了这样

尝试改变目标矩形的大小也没有作用

Answer 1

You should scale QPixmap. This function has methods scaledToWidth and scaledToHeight

QPixmap QPixmap::scaledToWidth(int width, Qt::TransformationMode mode = Qt::FastTransformation) const

Returns a scaled copy of the image. The returned image is scaled to the given width using the specified transformation mode. The height of the pixmap is automatically calculated so that the aspect ratio of the pixmap is preserved.

If width is 0 or negative, a null pixmap is returned.

Scale the image before drawing

Answer 2

Is the QPainter painter(this) in your this here the window of your wuziqi?

Answer 3

Your qipan control does not cover the entire window...