class VEC_ALG |
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atn2(x,y:FLT):FLT |
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**** | similar to atan2. return 0<=atn2<4 while 0<=arg(x,y)<2pi |
rotation(x0, y0, x1, y1, x2, y2:INT):INT |
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**** |
__rotational_order_of_3-vector_p0,_p1,_p2. rotation of 3-pts. p0, p1, p2 = -1,0,1. __1:_p0-p1-p2_run_anti-clockwise. -1: p0-p1-p2 run clockwise. __0:_singular_case. |
sLength(inout x, inout y:INT, d:INT) |
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**** | change length of the vector(x,y) to d. I assume length(x,y)/=0 |