CODEWITHSUNDEEP
c++opengl
user2111311
user2111311

Reputation: 13

OpenGL translation

I'm having some problems translating an object I'm drawing. This is the entirety of my display function. I can't seem to find anything I'm doing wrong.

glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0, 720, 480, 0, -1.0, 1.0);
glTranslatef(-0.5f,0.0f,0.0f);

//drawing object here

glPopMatrix();
glutSwapBuffers();

Upvotes: 0

Views: 189

Answers (1)

Joseph Mansfield
Joseph Mansfield

Reputation: 110658

You need to start modifying the modelview matrix stack after you've done glOrtho:

// ...
glOrtho(0, 720, 480, 0, -1.0, 1.0);

glMatrixMode(GL_MODELVIEW);
glTranslatef(-0.5f,0.0f,0.0f);
// ...

But now your glPushMatrix and glPopMatrix are modifying different stacks, so the glPopMatrix will result in an error. You shouldn't need them for such a simple example anyway.

Upvotes: 2

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