if ( s*s+(t-0.1)*(t-0.1) <= 0.55 && s*s + (t-0.38)*(t-1) >= 0.18)
surfcolor = color (0.235-s*t*0.5,0.235-s*t*0.5,0.0);//dark green on top
else if ( s*s+(t-0.35)*(t-0.1) <= 0.85 && s*s + t*t >= 0.6)
surfcolor = color (0.835+ 0.2*s, 0.8 + 0.2*s, 0.5+0.2*s);//light green in center
else if ( (s-0.8)*(s-0.2)+(t-0.5)*t >= 0.1 && s*s +t*t <= 0.55)
surfcolor = color ( 1+0.35*t,0.5, 0.15*t); //orange on the left
else if ( (s-0.1)*(s-0.2)+(t-0.5)*t >= 0.5 && s*s +t*t <= 0.98)
surfcolor = color ( 0, 0.5-0.35*t, 0.15-t); //green
else if ( (s-0.9)*(s-0.8)+(t-0.5)*t >= 0.05 && (s-0.7)*(s-0.8) +t*t <= 0.5 && s<0.7)
surfcolor = color (0.6+s*t,0.0,0.0); //dark red in center
else if ( s*s +t*t <= 0.4)
surfcolor = color (1,0,0); //bright red on the left
else if ( s*s +t*t >= 1.3 )
surfcolor = color (1.2-s*t*0.6,0,0); //red in the right bottom
else if ( s*s +(t-0.3)*(t-0.1) >= 0.98 )
surfcolor = color (0.235-s*t*0.5,0.235-s*t*0.5,0.0); //black stripe
else surfcolor = back_tint;
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