Function closestPointToPickLocation

stackgl_modules/index.js:16860–16895

(simplex, pixelCoord, model, view, projection, resolution)

}

function closestPointToPickLocation(simplex, pixelCoord, model, view, projection, resolution) {
  if(simplex.length === 1) {
    return [0, simplex[0].slice()]
  }
  var simplex2D = new Array(simplex.length)
  for(var i=0; i<simplex.length; ++i) {
    simplex2D[i] = projectVertex(simplex[i], model, view, projection, resolution);
  }

  var closestIndex = 0
  var closestDist  = Infinity
  for(var i=0; i<simplex2D.length; ++i) {
    var d2 = 0.0
    for(var j=0; j<2; ++j) {
      d2 += Math.pow(simplex2D[i][j] - pixelCoord[j], 2)
    }
    if(d2 < closestDist) {
      closestDist  = d2
      closestIndex = i
    }
  }

  var weights = barycentricCoord(simplex2D, pixelCoord)
  var s = 0.0
  for(var i=0; i<3; ++i) {
    if(weights[i] < -0.001 ||
       weights[i] > 1.0001) {
      return null
    }
    s += weights[i]
  }
  if(Math.abs(s - 1.0) > 0.001) {
    return null
  }
  return [closestIndex, interpolate(simplex, weights), weights]
}

/***/ }),