Drawing nearly perfect 2D line segments in OpenGL

using the code:
just include vase_rend_draft_2.h to your project files and it should work.

to test by drawing a spectrum:
	for ( int i=0; i<20; i++)
	{
		line ( 5+29.7*i,187, 35+29.7*i,8, //coordinates
			0.3*(i+1),		//thickness in px
			0.5, 0.0, 1.0, 1.0,	//color RGBA
			0,0,			//not used
			true);			//enable alphablend
	}

more info at:

http://www.codeproject.com/KB/openGL/gllinedraw.aspx

http://artgrammer.blogspot.com/2011/05/drawing-nearly-perfect-2d-line-segments.html