如何旋转png图像Delphi？ [英] How to rotate png image Delphi?

问题描述

如何在Delphi中旋转png图像以保持其透明度？
我通过 TPNGObject 加载它。
然后我使用 Canvas.StretchDraw（MyRect，TPNGObject），但我不知道如何旋转它。

How can I rotate a png image in Delphi with preserving its transparency? I loaded it via TPNGObject. I'm then using Canvas.StretchDraw(MyRect, the TPNGObject) but I don't know how to rotate it.

推荐答案

问题是如果您使用Canvas进行旋转，那么您将失去透明度，就像您使用TPNGObject所指出的那样。

The problem is that if you do a rotate using the Canvas, you will lose your transparency, as you noted with TPNGObject.

这是因为Canvas不支持PNG图像所需级别的透明度。

This is because the Canvas doesn't support transparency at the level required by a PNG image.

相反，您必须使用专门的代码来旋转PNG图片。这是一个链接到支持TPNGObject的代码库，包括一个旋转它的函数：
http://cc.embarcadero.com/Item/25631

Instead, you must use specialized code to rotate the PNG image. Here is a link to a library of code that supports the TPNGObject, including a function to rotate it: http://cc.embarcadero.com/Item/25631

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