scripts.js

function menorDistanciaPS(A, B, C)
// Menor distancia del segmento AB al punto C
{
    if(A.x === B.x && A.y === B.y) {
        // A y B son el mismo punto, devolvemos A->C
        return moduloVector(A.x - C.x, A.y - C.y);
    } else {
        var uN = (C.x-A.x)*(B.x-A.x)+(C.y-A.y)*(B.y-A.y); //Numerador
        var uD = Math.pow((B.x - A.x),2)+Math.pow((B.y - A.y), 2); //Denominador
        var u = uN / uD;
        //Si u < 0, d = A->C; u > 1, d = B->C; else d = P->C (Calcular P)

        if (u < 0)
            return moduloVector(A.x - C.x, A.y - C.y);
        else if (u > 1)
            return moduloVector(B.x - C.x, B.y - C.y);
        else {
            var P = [A.x + u * (B.x - A.x), A.y + u * (B.y - A.y)];
            return moduloVector(P[0] - C.x, P[1] - C.y);
        }
    }
}
function signo(n) {
	if(n < 0) return -1;
	else return 1;
}

function moduloVector(x, y) {
	return Math.sqrt( x*x + y*y );
}