将GaussianBlur或像素应用于多边形

Question

我能够将GaussianBlur或像素应用于矩形区域。

image.Mutate(x => x.GaussianBlur(5, new CoreRectangle(o.BoundingBox.X - 10, o.BoundingBox.Y - 10, o.BoundingBox.Width + 20, o.BoundingBox.Height + 20)));

有没有办法用n点多边形代替？有什么想法吗？

谢谢!约尔格

Answer 1

这应该适用于您，它克隆原始图像，将效果应用于克隆，然后使用图像灌木填充一个形状，正好是突变图像的正确部分。

using (Image image = Image.Load("fb.jpg"))
{
    var outerRadii = Math.Min(image.Width, image.Height) / 2;
    var star = new Star(new PointF(image.Width / 2, image.Height / 2), 5, outerRadii / 2, outerRadii);

    // we want to clone our source image so we can apply 
    // various effects to it without mutating the original.
    using (var clone = image.Clone(p => {
        p.GaussianBlur(15); // apply the effect here you and inside the shape
    }))
    {
        // crop the cloned down to just the size of the shape (this is due to the way ImageBrush works)
        clone.Mutate(x => x.Crop((Rectangle)star.Bounds));

        // use an image brush to apply the section of cloned image as the source for filling the shape
        var brush = new ImageBrush(clone);

        // now fill the shape with the image brush containing the portion of 
        // cloned image with the effects applied
        image.Mutate(c => c.Fill(brush, star));
    }

    image.Save("output/fb.png");
}

这是最后结果的一个例子：

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这是和其他示例都可以在ImageSharp示例存储库中获得。