ArcGIS for JS 获取两条相交线的交点坐标信息

 /**
         * 获取两条相交线的交点坐标信息
         * @param {any} 线1
         * @param {any} 线2
         * @param {any} 回调函数
         */
        intersect: function (geometry_r1, geometry_r2, func) {
            var path1 = geometry_r1.paths[0];
            var path2 = geometry_r2.paths[0];
            for (var i = 0; i < path1.length - 1; i++) {
                for (var j = 0; j < path2.length - 1; j++) {
                    var a1 = path1[i][1] - path1[i + 1][1];
                    var b1 = path1[i + 1][0] - path1[i][0];
                    var c1 = a1 * path1[i + 1][0] + b1 * path1[i + 1][1];
                    //转换成一般式: Ax+By = C
                    var a2 = path2[j][1] - path2[j + 1][1];
                    var b2 = path2[j + 1][0] - path2[j][0];
                    var c2 = a2 * path2[j + 1][0] + b2 * path2[j + 1][1];
                    // 计算交点        
                    var d = a1 * b2 - a2 * b1;
                    // 当d==0时，两线平行
                    if (d == 0) {
                        return false;
                    } else {
                        var x = (b2 * c1 - b1 * c2) / d;
                        var y = (a1 * c2 - a2 * c1) / d;
                        // 检测交点是否在两条线段上
                        if ((isInBetween(path1[i + 1][0], x, path1[i][0]) || isInBetween(path1[i + 1][1], y, path1[i][1])) &&
                            (isInBetween(path2[j + 1][0], x, path2[j][0]) || isInBetween(path2[j + 1][1], y, path2[j][1]))) {
                            require(["esri/geometry/Point"], function (Point) {
                                var pt = new Point(x, y, map2dBase.map.spatialReference);
                                func(pt);
                            });
                        }
                    }
                }
                //如果b在a和c之间，返回true
                //当a==b或者b==c时排除结果，返回false
                function isInBetween(a, b, c) {
                    // 如果b几乎等于a或c，返回false.为了避免浮点运行时两值几乎相等，但存在相差0.00000...0001的这种情况出现使用下面方式进行避免
                    if ((Math.abs(a - b) > 0.000001 || Math.abs(b - c) > 0.000001) && ((b > a && b < c) || (b < a && b > c)) || (a == b || b == c)) {
                        return true;
                    } else {
                        return false;
                    }
                }
            }
        }