c# - 为什么 BufferedGraphics 绘制速度慢？

Question

我在 Form_Paint 事件上使用 BufferedGraphics。它绘制了我需要的图形，但它太慢了。请给我解决这个问题的提示或任何关于更好的绘图技术的建议，以便快速响应。

BufferedGraphicsContext currentContext;
BufferedGraphics myBuffer;
// Gets a reference to the current BufferedGraphicsContext
currentContext = BufferedGraphicsManager.Current;
// Creates a BufferedGraphics instance associated with Form1, and with 
// dimensions the same size as the drawing surface of Form1.
myBuffer = currentContext.Allocate(this.CreateGraphics(),
this.DisplayRectangle);
// Draws an ellipse to the graphics buffer.

myBuffer.Graphics.DrawImage(new Bitmap("C:\\Documents and Settings\\Administrator\\My Documents\\My Pictures\\Pics\\Pic.jpg"), 0, 0);
myBuffer.Graphics.DrawEllipse(Pens.Blue, 5, 90, 10, 10);
myBuffer.Graphics.DrawRectangle(Pens.Gold, 0, 7, 500, 500);
myBuffer.Graphics.DrawLine(Pens.Chartreuse, 0, 0, 800, 800);

myBuffer.Render();

这是 BufferedGraphics 的一个小例子，它工作正常，但是当负载增加时，它会变慢。

Answer 1

尝试使用 e.Graphics 而不是 this.CreateGraphics()