bezier curve problem
Blitz3D Forums/Blitz3D Programming/bezier curve problem
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| Why do my aliens always seem to swoop off to the left with the following code. i.e the bezier curve generated always seems to loop off to the left and not random left/right as I want (Hope you get that). bezier co-ords generated here: If swoop_num<max_swoop If inv1\swoop=False swoop_on=Rnd(0,swoop_freq) If swoop_on=0 swoop_num=swoop_num+1 inv1\swoop=True inv1\x1=inv1\x inv1\y1=inv1\y inv1\cmx1=inv1\x1+Rnd(-400,400) inv1\cmy1=inv1\y1+Rnd(-100,100) inv1\x2=Rnd(100,700) inv1\y2=600 inv1\cmx2=Rnd(-500,500) inv1\cmy2=Rnd(-400,400) EndIf EndIf EndIf here the beizer code: If inv1\swoop=True inv1\t#=inv1\t#+0.004 inv1\x= inv1\x1*(1-inv1\t)^3 + 3*inv1\cmx1*(1-inv1\t)^2*inv1\t + 3*inv1\cmx2*(1-inv1\t)*inv1\t^2 + inv1\x2*inv1\t^3 inv1\y= inv1\Y1*(1-inv1\t)^3 + 3*inv1\cmy1*(1-inv1\t)^2*inv1\t + 3*inv1\cmy2*(1-inv1\t)*inv1\t^2 + inv1\y2*inv1\t^3 If inv1\y=>600;inv1\t#>=1 inv1\t#=0 swoop_num=swoop_num-1 ;inv1\swoop=False Delete inv1 EndIf EndIf |
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It's only a guess, but maybe it has something to do with the following paradoxon:print -10^2 print 10^2 will give you 100 both times. |
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| Yeah,thanks for that jfk, I think that this could be it, but I need to put a little more thought into this. Thanks for the pointer. |
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| Just randomly negate the x coord (once per 'swoop' of course). x^n will always yield positive, unless you're really into complex numbers ;) |
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| Hi VP, At the moment the line - inv1\x1=inv1\x sets the start point of the curve to the x position of the alien. inv1\cmx1=inv1\x1+Rnd(-400,400) sets the curve modifier for the curve. So I would have assumed that this would provide me with the offset that I require. |
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