XNA 在运行时在 Texture2D 上绘制/绘制
早上好（如果你所在的地方是早上）
我一直在环顾四周，没有找到令人满意的方法，所以我想我会四处询问......
理想的世界我希望能够生成一个透明的Texture2D对象。将其绘制到屏幕上我希望能够“绘制”它，即当鼠标左键按下时，光标所在的任何像素都应设置为黑色。接下来我需要能够使用这个纹理。
使用纹理是最简单的部分，我们可以简单地为“绘画”对象创建一个新的Texture2D属性，并在SpriteBatch.Draw方法中使用它。两个棘手的部分是
- 生成指定大小的texture2D对象，并在代码中填充透明度。
- 动态编辑texture2D（即能够改变像素颜色）
如果有人对您输入的这些有任何经验，我们将非常感激。
Morning all (if its morning where you are)
I have been looking around and have not seen a satisfactory method for doing this so thought I would ask around...
Ideal world I would like to be able to generate a transparent Texture2D object. Drawing this to the screen I would like to be able to "paint" to it, i.e. when the left mouse button is down whatever pixel the cursor is over should be set to black. Following this I would then need to be able to use this texture.
Using the texture is the easy part, we can simply make a new Texture2D attribute for a "painting" object and use that in the SpriteBatch.Draw method. The two tricky parts are
- Generating a texture2D object of a specified size, filled with transparency in code.
- Editing that texture2D on the fly (i.e. being able to alter pixel colours)
If anyone has any experience of these you input would be very much appreciated.
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您可以使用
RenderTarget2D(MSDN ），它本身就是一个Texture2D（因此您可以在SpriteBatch.Draw中使用它）。这允许您以与渲染到屏幕上相同的方式渲染到纹理上。您需要使用GraphicsDevice.SetRenderTarget(MSDN) 进行设置。或者您可以使用
Texture2D.SetData(MSDN) 直接操作像素。您可以直接构建透明的Texture2D（MSDN）。不要忘记处置您自己创建的任何纹理或其他资源！You can either use a
RenderTarget2D(MSDN), which is itself aTexture2D(so you can use it inSpriteBatch.Draw). This allows you to render onto a texture in the same way you render onto the screen. You need to useGraphicsDevice.SetRenderTarget(MSDN) to set this up.Or you can use
Texture2D.SetData(MSDN) to manipulate pixels directly. You can construct a transparentTexture2Ddirectly (MSDN). Don't forget toDisposeof any textures or other resources you create yourself!