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Building 3D worlds with OpenGL |
resizeGL()
This function sets up the viewport for my scene. It is pretty standard stuff, in many cases you can simply copy this into your own program.
void GameWidget::resizeGL( int width, int height )
{
GLfloat w = (float) width / (float) height;
GLfloat h = 1.0;
glViewport( 0, 0, width, height );
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum( -w, w, -h, h, 5.0, 60.0 );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef( 0.0, 0.0, -40.0 );
}
|
paintGL()
This function draws the scene whenever necessary. It also does the rotation. As you can see, it calls the display list I made in initializeGL().
void GameWidget::paintGL()
{
if ( Animate )
Angle += 2.0;
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glPushMatrix();
glTranslatef( 0.0, -5.0, 0.0 );
glRotatef( Angle, 0.0, 1.0, 0.0 );
glCallList( Landscape ); // call display list
glPopMatrix();
}
|
Comment List
| Topic: | Author: | Time: |
|---|---|---|
| Beginner's tutorials | Johann Fuchs | 13.02.2001 17:04 |
|
if you want to learn opengl programming from the scratch
|
||
