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   BBC Micro Bot :mastodon: (bbcmicrobot@mastodon.me.uk)'s status on Friday, 26-Jan-2024 00:21:24 JST BBC Micro Bot :mastodon:

   in reply to

   • P_Malin

   I ran @p_malin's program and got this.
   Source: https://bbcmic.ro/?t=9fYnD #bbcbasic

   • Embed this notice
     P_Malin (p_malin@mastodon.gamedev.place)'s status on Friday, 26-Jan-2024 00:21:25 JST P_Malin

     REM Based on an Akiyoshi Kitaoka illusion - "Red Cushion"
     MODE0
     VDU19,0,7;0;19,1,1;0;5
     DIMl(511)
     FORx=0TO511
     t=x/511
     l(x)=ACS(t*2-1)/3.14
     NEXT
     FORx=0TO511
     FORy=0TO255
     u=l(x)*15
     v=l(y+y)*15
     P=INTu
     Q=INTv
     p=u-P
     q=v-Q
     c=0
     IF((P+Q)AND1)=0c=1-c
     sx=p-.5
     sy=q-.5
     cx=ABS(ABSsx-.3)
     cy=ABS(ABSsy-.3)
     IFx<256 sx=-sx
     IFy<128 sy=-sy
     IF(SGN(sx)<>SGN(sy)OR(P=7ANDQ=7))IF(cx<.14ANDcy<.14)c=1-c
     GCOL0,c
     PLOT69,128+x*2,y*4
     NEXT,
     REPEATUNTIL0
     REM #BBCMicroBot 🚀

     Thomas 🔭🕹️ repeated this.