private void glControl1_MouseUp(object sender, MouseEventArgs e)
{
if (glc_state == GLCState.DragRotation)
glc_state = GLCState.Free;
}
private void glControl1_MouseDown(object sender, MouseEventArgs e)
{
previous_mouse_x = e.X;
previous_mouse_y = e.Y;
if (e.Button == MouseButtons.Left && glc_state == GLCState.Free)
glc_state = GLCState.DragRotation;
}
