at a time. The variable A$ is used to build a string of all the columns of BIT% in a given row.
As you can see, by taking the program in small pieces and analyzing it, graphics programming does not have to be difficult. If you want to try some other plots, try these (replace lines after 600 with the lines below). The printouts from each program are shown below the listing.
600 ’
610'Subroutine to plot a star.
620'
630RAD = 9
640FOR ANG% = 0 TO 360 STEP 45
650RANG = ANG% * 3.14159 / 180
660RANG2 = (ANG% + 135) * 3.14159 / 180
670Xl = RAD * COS(RANG) + 10
680Yl = RAD * SIN(RANG) + 10
690X2 = RAD * COS(RANG2) + 10
700Y2 = RAD * SIN(RANG2) + 19
710GOSLJB270
720NEXT ANG%
730RETURN
600 ’
610'Subroutine to plot a sine wave.
620'
630Xl = 0 : Yl = 10 : X2 = 20 : Y2 = 10
640GOSUB 270
650 Xl = 10 : Yl = 0 : X2 = 10 : Y2 = 20
660GOSUB 270
670 irl= 0 : Yl = 10
680 FOR X2 = 0 TO 20 STEP .2
690 Y2 = 10 - 9 * SIN(3.14159 * X2 / 10) : GOSUB 270
700NEXT X2
710RETURN
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