lec4 - Scan Conversion Computer Graphics Lecture 4 Scan...

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Scan Conversion Computer Graphics Lecture 4
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Scan Conversion The general problem of scan conversion is which pixels to turn on. In this lecture we will see a few basic algorithms to solve the problem for: Lines Circles We will see how to fill an obgect
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Drawing a line A line defined by it’s two end points To draw a line all pixels between the two endpoint pixels must be illuminated. On raster devices we must calculate exactly which pixels in the frame- buffer are to be set. Note: this conversion is usually done in hardware
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Drawing a line (cont) Lines must appear straight of gently curving, we must use points close (<=1 pixel) away from the true position of the line The line must end accurately, so lines can be joined. The line should have a constant brightness (thickness) along its length (# of pixels per unit distance is constant)
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Drawing a line (cont) All lines should have the same density (brightness, thickness) irrespective of their length or orientation All lines should be drawn rapidly
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Incremental Line Drawing Methods
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