Unit2- line clipping.pptx - UNIT 2 POINT AND LINE CLIPPING...

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UNIT 2 POINT AND LINE CLIPPING
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WINDOWING AND CLIPPING The world coordinate system is used to define the position of objects in the natural world. This system does not depend on the screen coordinate system, so the interval of number can be anything (positive, negative or decimal). Sometimes the complete picture of object in the world coordinate system is too large and complicate to clearly show on the screen, and we need to show only some part of the object. The capability that show some part of object in a specified window is called windowing and a rectangular region in a world coordinate system is called window .
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A Window is a rectangular region in the world coordinate system. This is the coordinate system used to locate an object in the natural world. A Viewport is the section of the screen where the images encompassed by the window on the world coordinate system will be drawn. A coordinate transformation is required to display the image, encompassed by the window, in the viewport.
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The viewport uses the screen coordinate system so this transformation is from the world coordinate system to the screen coordinate system. When a window is "placed" on the world, only certain objects and parts of objects can be seen. Points and lines which are outside the window are "cut off" from view. This process of "cutting off" parts of the image of the world is called Clipping .
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In clipping, we examine each line to determine whether or not it is completely
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