Web site layout - OpenGL Super Bible! Page 55 screen extents of
OpenGL Super Bible! Page 55 screen extents of the window change; however, the drawing code continues to place the rectangle at (100, 150, 150, 100). In the original window this was directly in the center; in a larger window these coordinates are located in the lower-left corner. See Figure 3-5. Figure 3-5 Effects of changing window size Scaling to the Window In nearly all windowing environments, the user may at any time change the size and dimensions of the window. When this happens, the window usually responds by redrawing its contents, taking into consideration the window s new dimensions. Sometimes you may wish to simply clip the drawing for smaller windows, or display the entire drawing at its original size in a larger window. For our purposes, we usually will want to scale the drawing to fit within the window, regardless of the size of the drawing or window. Thus a very small window would have a complete but very small drawing, and a larger window would have a similar but larger drawing. You see this in most drawing programs when you stretch a window as opposed to enlarging the drawing. Stretching a window usually doesn t change the drawing size, but magnifying the image will make it grow. Setting the Viewport and Clipping Volume In Chapter 2 we discussed how viewports and clipping volumes affect the coordinate range and scaling of 2D and 3D drawings in a 2D window on the computer screen. Now we will examine the setting of viewport and clipping volume coordinates in OpenGL. When we created our window with the function call auxInitPosition(100,100,250,250);
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