Pong space invaders atari 2600 pac man commodore 64

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§ Pong § Space Invaders § Atari 2600 § Pac-man § Commodore 64 § Star wars (vector graphics)
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Then . . .
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Now!!
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Basic Terminology Raster: a rectangular array of points or dots Scan Line Raster Pixel Scan line: a row of pixels Pixel: a single picture element or dot of the raster
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Raster (Scan Line) Graphics Nearly all display graphics today is raster based! Horizontal retrace Vertical retrace Raster or Scan Line
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Terminology Scanning an image § Frame: the image to be scanned onto the CRT § Must scan some minimum number of frames each second to avoid flicker (TV – 30 frames/sec, Computer monitor – 60+ times/sec) § Varies with intensity, individuals, phosphor persistence, etc. Interlaced § Do every other scan line (fields – even, odd) § Scan alternately at 1/60 second
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Cathode Ray Tube (CRT) How your TV and CRT computer monitors work! Cathode (current departs) Focusing Deflection Coils Phosphor Coated Screen Anode (current enters)
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Vector Graphics Used more in early graphics displays! Draw (beam turned on) Move (beam turned off)
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Raster and Color Black and White: 1 bit/pixel Gray Scale: 8 bits/pixel 8-bit color: saves memory, 3-3-2 or color map 24-bit (RGB) color: 8 bits for each color channel – red, green, blue Colors described in R,G,B terms § Red car = (255, 0, 0)
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