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Dec 13th, 2017
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  1. | 0 -1 |
  2. d = (vx, vy) * | | = (-vy, vx)
  3. | 1 0 |
  4.  
  5. vL = sqrt(vx*vx + vy*vy)
  6. dN = d / vL = (-vy / vL, vx / vL)
  7.  
  8. L= C + dN * p = [(x1 + dN.x * p, y1 + dN.y * p), ...]
  9. R= C - dN * q = [(x1 - dN.x * q, y1 - dN.y * q), ...]
  10.  
  11. M1 = [L1, L2, ..., Ln, Cn, Cn-1, ... C1]
  12. M2 = [R1, R2, ..., Rn, Cn, Cn-1, ... C1]
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