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WarPie90

Untitled

Jun 23rd, 2022
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  1.     const DistToLineEx = (p, sA, sB) => {
  2.         let dx, dy, d
  3.         let f
  4.         let result = { nearest: {}, result: 0 }
  5.  
  6.         result.nearest.x = sA.x
  7.         result.nearest.y = sA.y
  8.         dx = sB.x - sA.x
  9.         dy = sB.y - sA.y
  10.         d = dx * dx + dy * dy
  11.  
  12.         if (d === 0) {
  13.             result.result = Math.hypot(p.x - sA.x, p.y - sA.y)
  14.             return result
  15.         }
  16.  
  17.         f = ((p.x - sA.x) * dx + (p.y - sA.y) * dy) / d
  18.  
  19.         if (f < 0) {
  20.             result.result = Math.hypot(p.x - sA.x, p.y - sA.y)
  21.         } else if (f > 1) {
  22.             result.nearest = sB
  23.             result.result = Math.hypot(p.x - sB.x, p.y - sB.y)
  24.         }
  25.  
  26.         result.nearest.x = Math.round(sA.x + f * dx)
  27.         result.nearest.y = Math.round(sA.y + f * dy)
  28.         result.result = Math.hypot(p.x - result.nearest.x, p.y - result.nearest.y)
  29.         return result
  30.     }
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