DrawReversibleLine() 和双缓冲
我正在使用自定义双缓冲，并希望使用 DrawReversibleLine() 绘制橡皮筋线。但这怎么办呢？此方法直接绘制到屏幕，因此我看不出如何在后台缓冲区上绘制。你会怎么办？
I'm using a curstom double buffering and want to draw a rubber band line with DrawReversibleLine(). But how can this be done? This method draws directly to the screen, so I see no way how to draw on the background buffer. What would you do?
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我会......用我的图像手动管理后台缓冲区，然后在发生变化时手动绘制它，然后在屏幕上用橡皮筋绘制，即拉动橡皮筋线的一端。
异或线 (DrawReversibleLine()) 旨在与 ZX Spectrum 或 Hercules 图形一起消亡。
I would... have one manually managed back buffer with my image, and manually paint it then rubber band on the screen when something is changed i.e. one end of the rubberband line pulled.
XOR-ed lines (DrawReversibleLine()) were meant to die with ZX Spectrum or Hercules graphics.
您应该在前缓冲区中绘制：DrawReversibleLine 无需重绘缓冲区即可工作，您只需在同一位置重绘线条即可使其消失。这是一个很好的优化，允许您只绘制橡胶框而不绘制整个场景，因此将 DrawReversibleLine 绘制到屏幕上应该不是问题。
You should draw in the front buffer: DrawReversibleLine works without needing to redraw the buffers, you just have to redraw the line in the same place to make it disappear. This is a good optimization that allow you to just draw the rubber box whitout drawing the entire scene, so having DrawReversibleLine drawing onto the screen should not be an issue.