问题描述
在我的游戏中，我需要绘制一个由正方形大小制成的圆圈（圆形由正方形组成）。我可以在每帧中以锯齿状圆形的形式绘制单色方形纹理，但它消耗了大量资源。我想做的就是在内存中的某个地方画一次，然后保存以画出每一帧。
In my game I need to draw a circle made of squares the sizes of a game tile (circle is made of squares). I could just draw monochrome square textures in form of a jagged circle each frame, but it consumes a significant amount of resources. What I'd like to do is to draw it somewhere in the memory just once and save to draw each frame after that.
我可以自己画一下这个圆圈并使用它作为一个准备好的纹理，但我的圆圈并不总是一样的。它在整个游戏中有不同的大小（并且它不是一半的时间圈，但我已经得到了说明在哪里绘制的算法），所以它必须以编程方式绘制。
I could simply draw said circle myself and use it as a ready texture, but my circle is not always the same. It has different size throughout the game (and it's not really a circle half of the time, but I've got the algo that says where to draw), so it has to be drawn programmatically.
推荐答案
首先将圆圈渲染为自定义 RenderTarget2D 。您可以像这样设置自定义渲染目标：
First you render the circle to a custom RenderTarget2D. You can set a custom render target like this:
GraphicsDevice.SetRenderTarget(renderTarget);
将圆圈渲染到渲染目标后，将其转换为 Texture2D 像这样：
After rendering your circle to the render target cast it to a Texture2D like this:
texture = (Texture2D)renderTarget;
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