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dagmare

OpenGL resizing windows and object

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Hey! I am using nehe 42 lesson to learn about Viewports. And I have found a problem with resizing. When I am changing the size of the ports, the object drawn on it also resize (eg. after stretching a window, sphere becames ellipsoid). Could anybody help me and tell how to make Viewports resizing without resizing the objects drawn in it?

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You'll want glViewport to size things correctly. You'll also want gluPerspective to keep things sized correctly. Whenever you process an OnSize message, call gluPerspective in something along the following lines:

void CChildView::OnSize(UINT nType, int cx, int cy)
{
CWnd::OnSize(nType, cx, cy);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();

glViewport(0, 0, cx, cy);

float height = (float)cy; // important! integers round
float width = (float)cx; // and will cause errors below

// Calculate The Aspect Ratio Of The Window
gluPerspective(30.0f,
width/height ,
0.1f,
300.0f);
}


Best of luck!
-jouley

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