Question

OK, I have made simple rectangular using OpenGL, and it looks pretty simple

    glNormal3f(0.0f, 0.0f, 0.0f);

    glVertex3f(-0.0, 2.0, 0.0);
    glVertex3f(1.0, 2.0, 0.0);
    glVertex3f(1.0, 0.0, 0.0);
    glVertex3f(0.0, 0.0, 0.0);

and small as well. So my Q. is how can I make this twice as bigger using one single line of code or how can I make lets say only X axis values to be doubled. I know it’s possible, but I have no idea what function to search for. Thanks in advance.

Answer 1

Well, you can move the camera closer by using glTranslate or scale the scene using glScale. But frankly?

x *= 2.0;
y *= 2.0;

glVertex3f(-0.0, y*2.0, 0.0);
glVertex3f(x*1.0, y*2.0, 0.0);
glVertex3f(x*1.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, 0.0);

… this is the way to go.