Epson FX-100 Manuale Utente Scaricare il pdf (Pagina 199)

drastic measures. One such measure would be to let each bit of the

numbers stored in the array cells represent one graphics dot. This

would increase the storage ability but tremendously complicate the

programming.

For symmetric designs such as the circle, you can use a different

measure. Take advantage of the symmetry to increase your output

four-fold without increasing the size of the array one iota. How? By

using the array to plot one-fourth of the circle in memory, then modi-

fying the array three times to generate the remaining three parts (Fig-

ure 13-6).

Figure 13-7. Divide and conquer

Try this out with the current program. Here are the changes you

need to make to your current program in order to plot the lower-right

corner :

D=SQR(R^2+C^2)

IF INT(D+.5)=20 THEN A(R,C)=1

130

LPRINT CHR$(27)"*"CHR$(5)CHR$(N)CHR$(0);

By moving the center of the circle from

(11,11)

to (0,0) and increasing

the radius from

to 20, you enlarge the figure.

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Epson FX-100 Manuale Utente Pagina 199