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Discrete Frechet Distance
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/* Discrete Fréchet Distance | |
* By Andreas Argelius http://argeli.us/ | |
* | |
* Implementation of Discrete Frechet Distance in Javascript. | |
* | |
* The paths are defined as [[x0, y0], [x1, y1], ...] | |
* | |
*/ | |
(function() { | |
'use strict'; | |
window.discreteFrechetDistance = function(a, b) { | |
var dist = function(p1, p2) { | |
return Math.sqrt(Math.pow(p1[0]-p2[0], 2) + Math.pow(p1[1]-p2[1], 2)); | |
}; | |
var C = new Float32Array(a.length * b.length), | |
dim = a.length, | |
i, j; | |
C[0] = dist(a[0], b[0]); | |
for (j = 1; j < dim; j++) { | |
C[j] = Math.max(C[j-1], dist(a[0], b[j])); | |
} | |
for (i = 1; i < dim; i++) { | |
C[i*dim] = Math.max(C[(i-1)*dim], dist(a[i], b[0])); | |
} | |
for (i = 1; i < dim; i++ ) { | |
for (j = 1; j < dim; j++) { | |
C[i*dim+j] = Math.max( | |
Math.min(C[(i-1)*dim+j], C[(i-1)*dim+j-1], C[i*dim+j-1]), | |
dist(a[i], b[j]) | |
); | |
} | |
} | |
return C[C.length-1]; | |
}; | |
})(); |
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