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

By M. M. Novak (auth.)

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As mentioned, the SCALE command is only useful when the data to be displayed is spread over a large range. It will not work with narrowly spaced high values, nor will it make use of the whole screen to display variation in data. For instance, small differences in they-coordinates will be displayed as small ripples on the line. To remove these restrictions from the program, an additional routine is required. In other words, as the variables can, in fact, have any magnitude, they must be appropriately scaled first, in order to fit on the screen.

If the maximum has been altered, the SCALE comes into effect in line 180. As mentioned, the SCALE command is only useful when the data to be displayed is spread over a large range. It will not work with narrowly spaced high values, nor will it make use of the whole screen to display variation in data. For instance, small differences in they-coordinates will be displayed as small ripples on the line. To remove these restrictions from the program, an additional routine is required. In other words, as the variables can, in fact, have any magnitude, they must be appropriately scaled first, in order to fit on the screen.

In other words, the whole circle is assigned the value of 100%; then the segments of that circle represent fractions of the whole. 3 The task of drawing a pie-chart, can be described in a few words. First, a circle is drawn. Then the individual input values are expressed as fractions of the total input (sum of all input values). Finally, the segments representing all fractions are drawn. 4. 14*F(L)/T: CS=COS(A): SN=SIN(A) DRAW 1, XC,YC TO R*CS+XC,R*SN+YC:NEXT On RUNning the program, you are first asked to enter some values.

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