directdraw

Graphics and GPU Programming Programming

Started by Sinan March 14, 2006 04:13 AM

1 comment, last by Aardvajk 18 years, 2 months ago

122

Author

March 14, 2006 04:13 AM

How can draw shapes( lines, rectangles or elipse) with mouse on diretdraw surface? I display video image on the same dircetdraw surface. thanks

Evil Steve

2,021

March 14, 2006 07:35 AM

You need to lock the surface, write bytes to the pointer returned, then unlock it. That means that you also need to write code to draw circles, lines, etc to a memory buffer.

Or use Direct3D in 2D mode, it's far easier, more flexible and most likely faster too.

Aardvajk

13,217

March 14, 2006 09:57 AM

If you are familiar with the Windows GDI for drawing shapes in normal windows, you can get a device context for the DirectDraw surface with Surface->GetDC(), draw on it using all the normal GDI functions then call ->ReleaseDC(). This is not particularly fast however.