META-INF.assets.rjzjh.zrender.contain.windingLine.js Maven / Gradle / Ivy

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There is a newer version: 2.0.0

define(function () {
    return function windingLine(x0, y0, x1, y1, x, y) {
        if ((y > y0 && y > y1) || (y < y0 && y < y1)) {
            return 0;
        }
        // Ignore horizontal line
        if (y1 === y0) {
            return 0;
        }
        var dir = y1 < y0 ? 1 : -1;
        var t = (y - y0) / (y1 - y0);

        // Avoid winding error when intersection point is the connect point of two line of polygon
        if (t === 1 || t === 0) {
            dir = y1 < y0 ? 0.5 : -0.5;
        }

        var x_ = t * (x1 - x0) + x0;

        return x_ > x ? dir : 0;
    };
});