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botagar/blerp.js

Created May 5, 2020 23:15
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Javascript implementation of Bilinear Interpolation
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blerp.js
Math.blerp = function (values, x1, y1, x2, y2, x, y) {
let q11 = (((x2 - x) * (y2 - y)) / ((x2 - x1) * (y2 - y1))) * values[x1][y1]
let q21 = (((x - x1) * (y2 - y)) / ((x2 - x1) * (y2 - y1))) * values[x2][y1]
let q12 = (((x2 - x) * (y - y1)) / ((x2 - x1) * (y2 - y1))) * values[x1][y2]
let q22 = (((x - x1) * (y - y1)) / ((x2 - x1) * (y2 - y1))) * values[x2][y2]
return q11 + q21 + q12 + q22
}
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