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.

610 'Subroutine to plot a star.

620

630RAD = 9

640 FOR ANG% = 0 TO 360 STEP 45

650RANG = ANG% * 3.14159 / 180

660RANG:!= (ANG% + 135) * 3.14159 / 180

670Xl = RAD J(COS(RANG) + 10

680Yl = RAD JcSIN(RANG) + 10

690X2 = RAD * COS(RANG2) + 10

700Y2 = RAD * SIN(RANG2) + l@

710GOSUB 270

720NEXT ANG%

730RETURN

-

-

600

610 'Subroutine to plot a sine wave.

620

630xl = 0 : Yl = 10 : X2 = 20 : Y2 = 10

640GOSUB 270

650Xl = 10 : Yl = 0 : X2 = 10 : Y2 = 20

660GOSUB 270

670Xl = 0 : Yl = 10

680FOR X2 = 0 TO 20 STEP .2

690Y2 = 10 - 9 ;kSIN(3.14159 * X2 / 10) : GOSUB 270

700NEXT X2

710RETURN

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Star Micronics SG-15, SG-10 user manual 620 ’

SG-10, SG-15 specifications

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