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ningunaparte/gist:08499682680b49d20745ca5970e91d8e

Created December 15, 2016 11:30
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Devuelve el área de un polígono en javascript
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gistfile1.txt
// DEVUELVE EL AREA DE TERMINADO POLIGONO
// http://www.mathopenref.com/coordpolygonarea2.html
function polygonArea(X, Y, numPoints) {
area = 0; // Accumulates area in the loop
j = numPoints - 1; // The last vertex is the 'previous' one to the first
for (i = 0; i < numPoints; i++) {
area = area + (X[j] + X[i]) * (Y[j] - Y[i]);
j = i; //j is previous vertex to i
}
return area / 2;
}
var xPts = [4, 4, 8, 8, -4, -4];
var yPts = [6, -4, -4, -8, -8, 6];
var a = polygonArea(xPts, yPts, 6);
console.log("Area = " + a);
// http://math.stackexchange.com/questions/99565/simplest-way-to-calculate-the-intersect-area-of-two-rectangles
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