Advanced Graphics with the IBM Personal Computer - download pdf or read online

By Ian O. Angell

ISBN-10: 0333370635

ISBN-13: 9780333370636

ISBN-10: 0333388542

ISBN-13: 9780333388549

ISBN-10: 1349073385

ISBN-13: 9781349073382

Offers a accomplished creation to special effects utilizing uncomplicated at the IBM workstation. offers in-depth insurance of pixel block and personality snap shots, games or low-resolution portraits, the development of information graphs, - and third-dimensional portraits, the set-up of advanced gadgets, hidden line and floor algorithms, and viewpoint and stereoscopic perspectives. historical past arithmetic resembling coordinate geometry and matrix manipulation are defined intimately, and application segments and wide illustrations are supplied.

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17 100 110 120 130 139 140 150 160 170 180 189 190 200 209 210 220 230 240 249 250 260 270 280 290 299 300 309 310 320 MODE%=1 : PALETTE%=0 FOREGROUND%=1 : BACKGROUND%=1 GOSUB 60000 "colour monitor DIM A%(10) "draw character in logical colour 3 and add lines in logical colours l ( horizontal ) and 2 (vertical ). PRINT CHR$(15) LINE (0,3)-(7,3) ,2 LINE (0,4)-(7,4),2 LINE (3,0)-(3,7),1 LINE (4,0)-(4,7),1 "store shape and delete with XOR. GET (0,0)-(7,7),A% PUT (O,O),A%,XOR "initialise movie data.

12). This animates a line drawing of a 'spaceship' moving diagonally across the screen. You should consult the manual for the complete description of the very powerful graphics definition language. The example uses BM330, 6 to move the ship to its initial position, and a string variable SHIP$ to DRAW the ship. SHIP$ uses E (move diagonally up and right), R (move right), M-20, 12 (relative move by 20 left and 12 down), D (move down) and CO or C1 (for setting the colour). Over-drawing a shape in the background colour deletes a previous image, so that a loop which incorporates this idea with moving the initial point of reference of the ship down the screen creates the effect of downward diagonal movement.

This deliberate movement of the bottom left-hand corner of the window to (2, 3) demonstrates that it need not always be the origin. Note that defining a new WINDOW does not clear the screen. If the screen was cleared each time, then the effect of panning out from the circle is achieved, and reversing the order of WINDOW construction would give a zooming effect. A peculiar y-scale was deliberately chosen in order to demonstrate a particular property of the CIRCLE command. Once it has centred the circle, calculated the radius measured along the x-direction and fixed the ASPECT, the CIRCLE command works in terms of screen pixels.

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Advanced Graphics with the IBM Personal Computer by Ian O. Angell


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