将鼠标指针处的较小图像叠加到图片框上 [英] Overlay a smaller image at mouse pointer onto a PictureBox

问题描述

我刚刚开始为 C# 应用程序开发 Winforms GUI，想知道以下是否可行?

I'm just starting to develop the Winforms GUI for a C# application and was wondering if the following was possible?

我希望在图片框中显示大图像(很容易完成)，然后当鼠标指针位于较大图像上时，将第二个较小的图像覆盖在鼠标位置的大图像上.如果可能，我希望叠加图像部分透明.

I wish to display a large image in a Picture Box (easily done) and then have a second smaller image overlay onto the large image at the mouse position, when the mouse pointer is over the larger image. If possible I would like the overlay image to be partially transparent.

由于 GUI 设计还处于早期阶段，如果这会使我的要求更容易，我可以将其更改为 WPF.

As the GUI design is at an early stage I can change it to WPF if this would make what I'm asking any easier.

非常感谢，

安迪.

推荐答案

那是 Winforms 中的单行，只需更改 PictureBox.Cursor 属性:

That's a one-liner in Winforms, just change the PictureBox.Cursor property:

 pictureBox1.Cursor = new Cursor(new MemoryStream(Properties.Resources.ExampleCursor));

如果您需要任意图像，则需要将位图转换为光标.一个小辅助函数来做到这一点:

If you need an arbitrary image then you need to convert the bitmap to a cursor. A little helper function to do it:

using System.Reflection;
...
    private static Cursor CursorFromBitmap(Bitmap bmp) {
        var hicon = bmp.GetHicon();
        var cursor = new Cursor(hicon);
        var fi = typeof(Cursor).GetField("ownHandle", BindingFlags.NonPublic | BindingFlags.Instance);
        fi.SetValue(cursor, true);
        return cursor;
    }

使用一些反射技巧来避免必须跟踪句柄并显式销毁它.像这样使用它:

With some reflection trickery to avoid having to keep track of the handle and destroy it explicitly. Use it like this:

 pictureBox1.Cursor = CursorFromBitmap(Properties.Resources.ExampleImage);

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