Created
February 4, 2014 13:24
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BBC Basic plot
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100 REM Circular 3D plot program | |
110 MODE1 | |
120 GCOL0,2 | |
130 VDU19,0,4,0,0,0 | |
140 GCOL0,128:CLG | |
150 K=5*PI/10000 | |
160 DEF FNA(Z)=10*SIN(K*(X*X+Y*Y)) | |
170 FOR X=-100 TO 100 STEP 2 | |
180 Z1=0 | |
190 Y1=5*INT(SQR(10000-X*X)/5) | |
200 FOR Y=Y1 TO -Y1 STEP -5 | |
210 Z=INT(80+FNA(SQR(X*X+Y*Y))-.707*Y) | |
220 IF Z<Z1 THEN 270 | |
230 Z1=Z | |
240 SX=640+5*X | |
250 SZ=300+3*Z | |
260 PLOT69,SX,SZ | |
270 NEXT Y | |
280 NEXT X | |
290 END |
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