选择并剪切和替换图像区域 [英] select and cut and replace a region of image

问题描述

嗨.
我有一个图片框，并将图像导入到该图片框.我要选择此图片框(图像)的一个区域，例如"MS Paint中的自由格式选择" ，然后剪切选定的区域，并用另一个图像或系统颜色替换(填充)该区域.
您对这个问题有什么想法?！

Hi.
I have a picture box and import image to this picture box. I want select a region of this picture box (image) like "free-form selection in MS Paint" then cut selecteced region and replace (fill) this region with another image or a system color.
What is your idea for this problem?!
Thanks.

推荐答案

在类级别创建GraphicsPath，并在MouseMove处理程序中为其添加一行.

Create a GraphicsPath at class level, and add a line to it in the MouseMove handler.

GraphicsPath myPath = new GraphicsPath();
...
myPath.AddLine(oldPoint, newPoint);
oldPoint = newPoint;
...

当您想影响实际图像时，请从路径创建一个Region并填充它:

When you want to affect the actual image, create a Region from the path and fill it:

Region myRegion = new Region(myPath);
using (Graphics g = Graphics.FromImage(myPicturePox.Image))
   {
   g.FillRegion(Brushes.Red, myRegion);
   }

您必须使图片框无效才能重新显示.
或者，您可以使用区域"仅引用用户标记为其他操作的图像部分.

You will have to Invalidate the picture box to re-display it.
Or you can use the Region to reference only those parts of the image the user has marked for other operations.

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