How to make a window resize in OpenGL so that when the window is resized, the image does not scale?

Question

OpenGL

When changing the height of the window, the picture is scaled to fit in the window

to set the scene using the following code

Gl.glViewport(0, 0, simpleOpenGlControl1.Width, simpleOpenGlControl1.Height);
            Gl.glMatrixMode(Gl.GL_PROJECTION);
            Gl.glLoadIdentity();
            Glu.gluPerspective(45.0f,
                (float)simpleOpenGlControl1.Width / (float)simpleOpenGlControl1.Height,
                0.1f, 100.0f);
            Gl.glMatrixMode(Gl.GL_MODELVIEW);
            Gl.glLoadIdentity();

Answer 1

In general, you need to work with the projection matrix (you have gluPerspective) and glViewport. You can try to put constants at the viewport instead of the width and height of the control.