在gdi+中旋转图像时如何避免出现Alias？
我在 gdi+ 中的画布上旋转图像时遇到问题，我使用以下代码，但是我发现边缘有别名。
myPathMatrix.Rotate(GetDCAngle(), MatrixOrderAppend);
myPathMatrix.Translate(
GetDCX(),
GetDCY(),
MatrixOrderAppend);
canvas->SetTransform(&myPathMatrix);
canvas->Draw(XXX);
我使用以下代码删除别名，但失败了。
canvas->SetInterpolationMode(InterpolationMode::InterpolationModeHighQualityBicubic);
canvas->SetSmoothingMode(SmoothingModeAntiAlias);
如何删除旋转图像边缘的别名。
非常感谢！
I have a problem on roating an Image on a canvas in gdi+, I am using the following code, however I find there are alias on the edge.
myPathMatrix.Rotate(GetDCAngle(), MatrixOrderAppend);
myPathMatrix.Translate(
GetDCX(),
GetDCY(),
MatrixOrderAppend);
canvas->SetTransform(&myPathMatrix);
canvas->Draw(XXX);
I used the following code to remove the alias, but failed.
canvas->SetInterpolationMode(InterpolationMode::InterpolationModeHighQualityBicubic);
canvas->SetSmoothingMode(SmoothingModeAntiAlias);
How can I remove the alias at rotated image's edges.
Many thanks!
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自从我使用 GDI+ 以来已经有一段时间了，但我认为没有有效的选项可以在旋转时消除边缘周围的抗锯齿效果。 原因基本上是像素是正方形的。 要将图像旋转 90 度倍数以外的角度，您需要使用某种插值来估计之前没有真正像素的像素颜色。
因此，如果库中没有任何内容可以专门消除边缘周围的抗锯齿功能，您是否考虑过沿边框的背景颜色绘制硬线？ 在没有任何抗锯齿的情况下绘制这些线条应该更容易。
It's been a while since I worked with GDI+, but I'd assume there's no effective option to remove antialiasing around the edges when rotating. The reason is basically that pixels are square. To rotate an image an amount other than a multiple of 90 degrees, you need to use some kind of interpolation to estimate pixel colours where there weren't really pixels before.
So if there's nothing in the library to specifically take away antialiasing around the edges, have you thought about drawing hard lines in the background colour along the borders? It should be easier to draw those lines without any antialiasing.