quad sizing

Or you could use glScale. Of course, there''s not much point to that when you can just change the coorinates defined by glVertex. I do use glScale for changing the size of a generic quad (whose vertex data is in a VBO) that I use for my GUI system, though.

Thanks.

glPushMatrix();
glTranslatef(Pos.x, Pos.y, 0);			
	glBegin(GL_QUADS);		
	// Quad x/y coords are it''s top left corner

 	glVertex3f(0.0f,        0.0f,          0.0f);
 	glVertex3f(QuadWidth,   0.0f,          0.0f);
	glVertex3f(QuadWidth,   -QuadHeight,   0.0f);
	glVertex3f(0.0f,        -QuadHeight,   0.0f);

	// Or it''s center

	glVertex3f(-Width * 0.5f,	Height * 0.5f,	0.0f);
 	glVertex3f( Width * 0.5f,   Height * 0.5f,  0.0f);
	glVertex3f( Width * 0.5f,  -Height * 0.5f,  0.0f);
	glVertex3f(-Width * 0.5f,  -Height * 0.5f,  0.0f);

	// Optimized to

	Width *= 0.5f;
	Height *= 0.5f;

	glVertex2f(-Width,	 Height,  0.0f);
 	glVertex2f( Width,   Height,  0.0f);
	glVertex2f( Width,  -Height,  0.0f);
	glVertex2f(-Width,  -Height,  0.0f);
	glEnd();
glPopMatrix();

This could also do the trick: Let's say you want to make the quad one half the normal size:

glPushMatrix();
glTranslatef(xPos, yPos);


glScalef(0.5, 0.5, 1); //scale it to one half the size.
glBegin(GL_QUADS);
glVertex3f(-1.0f, 1.0f, 0.0f);
glVertex3f( 1.0f, 1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glEnd();
glPopMatrix();

Of course, you could use variables for the width/height factors in glScalef: glScalef(scale_x, scale_y, 1);

[edited by - EGD Eric on January 10, 2004 3:58:21 PM]