Distance from point to line - Node.js Geometry

Node.js examples for Geometry:Line

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Description

Distance from point to line

Demo Code

// http://stackoverflow.com/a/6853926/2608804
function pDistance(x, y, x1, y1, x2, y2) {
    var A = x - x1;
    var B = y - y1;
    var C = x2 - x1;
    var D = y2 - y1;

    var dot = A * C + B * D;
    var len_sq = C * C + D * D;
    var param = dot / len_sq;

    var xx, yy;/*w w w  .jav  a2s.c  om*/

    if (param < 0 || (x1 == x2 && y1 == y2)) {
        xx = x1;
        yy = y1;
    }
    else if (param > 1) {
        xx = x2;
        yy = y2;
    }
    else {
        xx = x1 + param * C;
        yy = y1 + param * D;
    }

    var dx = x - xx;
    var dy = y - yy;
    return Math.sqrt(dx * dx + dy * dy);
}

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