Advanced Graphics with the Commodore 128 by M. M. Novak (auth.)

By M. M. Novak (auth.)

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In the course of the present exposition we shall also encounter another system of coordinates- the polar system. As in the Cartesian system of coordinates, the position of a point is determined by a pair of numbers. However, their meaning is now quite different. The first number refers to the distance of the point from the origin, while the second number defines the angle between the horizontal axis and the fictitious line connecting that point with the origin. For instance, to find a point P(88,45) in the polar system of coordinates, draw a line at an angle of 45° to the x-axis.

The resulting image is now greatly improved, but we can take it a step further by presenting solid bars. The solid bar is created by simply filling it with colour. This is done by specifying the last parameter on the BOX command. 3. 3 100 110 120 130 REM HISTOGRAM 3 - SOLID BAR COLOR 1,8: GRAPHIC 1,1 YC=99: FOR X=10 TO 300 STEP 10: Y=80*SINCX/10)+YC BOX 1,X,YC,X+7,199-Y,,1: NEXT X Add some variation to the program, by replacing the SIN function by an arbitrary set of input values. Represent the top and bottom of each bar by a pair of numbers that are collected in DATA statements.

This is done by specifying the last parameter on the BOX command. 3. 3 100 110 120 130 REM HISTOGRAM 3 - SOLID BAR COLOR 1,8: GRAPHIC 1,1 YC=99: FOR X=10 TO 300 STEP 10: Y=80*SINCX/10)+YC BOX 1,X,YC,X+7,199-Y,,1: NEXT X Add some variation to the program, by replacing the SIN function by an arbitrary set of input values. Represent the top and bottom of each bar by a pair of numbers that are collected in DATA statements. You can see now that the logic behind the histograms is quite straightforward.

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