How to achieve smooth drawing with C# (like Paint .NET)?

Question

How Paint .NET can draw so fast using C#? Sample: The elipse perimeter is drawn while the mouse is beeing dragged without any visible delay. At a simple windows form application in C# If you use the MouseMove event of a Picturebox and draw a elipse based on the mouse position, there will be a lot of delay and flickering! So, how they do it so smoothly?

Answer 1

我对Paint.Net代码没有特别的了解，但很可能它使用的是Double Buffering ，并且可能是在自定义绘图表面上手动实现的，而不是预打包控件中的简单实现。

Answer 2

Paint.NET在调用Invalidate（）后调用Update（），强制立即同步WM_PAINT。

Answer 3

To get smooth drawing you should:

• Use Double Buffering (http://msdn.microsoft.com/en-us/library/b367a457.aspx)
• Use a dedicated toolkit for rendering (OpenGL/DirectDraw etc)

The best way to go in this case is with Double Buffering - it's supported 'out of the box' in the .NET framework, requires very little work, and will eliminate flickering.

Answer 4

They probably use WPF. It is much much faster than forms.