Drawing a line

try DrawPrimitive(...)
im using my own rootines, but i think
you can use DrawPrimitive to draw staff like lines etc...

if you want a really slow method you could get a DC and make GDI calls(moveto(hdc,x,y);LineTo(hdc,x,y), but somehow I think making your own function to find yer slope and blit pixels would work a little faster.

void BresenhamLine(int x0, int y0, int x1, int y1)
{
	int XUnit, YUnit, Offset = y0 * Pitch + (x0*3);
	int dy = y1 - y0;
	if(dy < 0)
	{
		dy = -dy;
		YUnit = -Pitch;
	}
	else
		YUnit = Pitch;

	int dx = x1 - x0;
	if(dx < 0)
	{
		dx = -dx;
		XUnit = -3;
	}
	else XUnit = 3;

	int ErrorTerm = 0;
	if(dx > dy)
	{
		for(int i = 0; i <= dx; i++)
		{
			Dest[Offset] = 255;
			Dest[Offset+1] = 0;
			Dest[Offset+2] = 0;

			Offset += XUnit;

			ErrorTerm += dy;
			while(ErrorTerm > dx)
			{
				ErrorTerm -= dx;
				Offset += YUnit;
			}
		}
	}
	else
	{
		for(int i = 0; i <= dy; i++)
		{
			Dest[Offset] = 255;
			Dest[Offset+1] = 0;
			Dest[Offset+2] = 0;

			Offset += YUnit;

			ErrorTerm += dx;

			while(ErrorTerm > 0)
			{
				ErrorTerm -= dy;
				Offset += XUnit;
			}
		}
	}
}
[/CODE]
This bit of source can show a line on the screen using a 24 bits surface.....
Dest is the surface pointer    

Dance with me......

http://members.xoom.com/CJdeVos/index.htm