fuyuhang
/
Project_yhfu
mirror of http://121.37.83.100:3000/sooka_onest/sooka_onest_forestfire_vue2_visualization.git


			
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    /*
     * Method: islandHoleHandlerForFeature。
     * 要素岛洞处理。
     *
     * 多面中，一个子面包含另一个子面，则被包含子面处理为岛洞。
     *
     * Parameters:
     * multiPolygon - {<SuperMap.Feature.Vector>} 需要进行岛洞处理的要素。
     *
     * Returns:
     * {<SuperMap.Feature.Vector>} 处理后的要素。
     */
    function islandHoleHandlerForFeature(feature) {
        if (feature.geometry instanceof SuperMap.Geometry.MultiPolygon && feature.geometry.components.length > 1) {
            var newGeometry = islandHoleHandlerForMultiPolygon(feature.geometry);
            feature.geometry = newGeometry;
        }
        return feature;

        /*
         * Method: islandHoleHandlerForMultiPolygon
         * 处理误判为岛洞的多面。
         *
         * iClient 在解析 iServer 数据时，默认将面要素处理为 MultiPolygon 类型，但有的面要素带有岛洞，
         * 这种情况下应该做特殊处理，本函数可以对一个多面进行岛洞处理，并返回新的多面。
         *
         * Parameters:
         * multiPolygon - {<SuperMap.Geometry.MultiPolygon>} 需要进行岛洞处理的多面。
         *
         * Returns:
         * {<SuperMap.Geometry.MultiPolygon>} 处理后的多面。
         */
        function islandHoleHandlerForMultiPolygon(multiPolygon) {
            if (multiPolygon instanceof SuperMap.Geometry.MultiPolygon && multiPolygon.components.length > 1) {
                var mPTmp = multiPolygon.clone();
                var componentsPolygons = mPTmp.components;

                //洞面关系数组
                var polygonHoleGroup = [];

                for (var k = 0, len = componentsPolygons.length; k < len; k++) {
                    var geoPolygon = componentsPolygons[k];

                    //不处理已经是岛洞的面
                    if (geoPolygon.components.length = 1) {
                        var lineRings = geoPolygon.components[0];

                        //将每个点放到面中进行判断
                        for (var j = 0, len1 = componentsPolygons.length; j < len1; j++) {
                            if (componentsPolygons[j].components.length != 1) continue;

                            if (j != k) {
                                var polygonGeoComp = componentsPolygons[j].components[0].components;

                                //假设此面为岛洞
                                var isAllPoiIn = true;

                                for (var i = 0, len2 = geoPolygon.components.length; i < len2; i++) {
                                    var point = lineRings.components[i];
                                    if (isPointInPoly(point, polygonGeoComp) == false) {
                                        isAllPoiIn = false;
                                        continue;
                                    }
                                }

                                //确定并记录洞面关系
                                if (isAllPoiIn == true) {
                                    var polygonHole = [j, k];
                                    polygonHoleGroup.push(polygonHole);
                                }

                            }
                        }
                    }
                    else {
                        continue;
                    }
                }
                // 根据洞面信息重构多面 Geometry。
                var bPsTmp = [];
                var hPsTmp = [];
                for (var m = 0, len3 = polygonHoleGroup.length; m < len3; m++) {
                    bPsTmp.push(polygonHoleGroup[m][0]);
                    hPsTmp.push(polygonHoleGroup[m][1]);
                }

                //岛洞基础面
                var bPs = delRepeatInArray(bPsTmp);
                //洞面
                var hPs = delRepeatInArray(hPsTmp);

                //独立面
                var iPs = [];
                //查找独立面
                for (var isIPs = 0, compLen = componentsPolygons.length; isIPs < compLen; isIPs++) {
                    var isNoHP = true;

                    for (var o = 0, len = bPs.length; o < len; o++) {
                        if (isIPs == bPs[o]) {
                            isNoHP = false;
                            break;
                        }
                    }

                    if (isNoHP == true) {
                        for (var o = 0, len = hPs.length; o < len; o++) {
                            if (isIPs == hPs[o]) {
                                isNoHP = false;
                                break;
                            }
                        }
                    }

                    if (isNoHP == true) {
                        iPs.push(isIPs);
                    }
                }

                //新洞面信息
                var hpInfo = [];

                //组织新geometry所需要的信息
                for (var o = 0, len4 = bPs.length; o < len4; o++) {
                    var ph = [];
                    ph.push(bPs[o]);
                    for (var m = 0, len3 = polygonHoleGroup.length; m < len3; m++) {
                        if (bPs[o] == polygonHoleGroup[m][0]) {
                            ph.push(polygonHoleGroup[m][1]);
                        }
                    }

                    if (ph.length > 1) {
                        hpInfo.push(ph);
                    }
                }


                var newComponents = [];
                //岛洞子面处理
                for (var m = 0, len3 = hpInfo.length; m < len3; m++) {
                    var geoP = hpInfo[m];
                    var newLineRings = [];
                    for (var n = 0, len6 = geoP.length; n < len6; n++) {
                        newLineRings.push(componentsPolygons[geoP[n]].components[0]);
                    }
                    var newGeoPolygon = new SuperMap.Geometry.Polygon(newLineRings);
                    newComponents.push(newGeoPolygon)
                }

                //独立子面处理
                for (var s = 0, len7 = iPs.length; s < len7; s++) {
                    var is = iPs[s];
                    newComponents.push(componentsPolygons[is])
                }

                multiPolygon.components = newComponents;
            }

            return multiPolygon;
        }

        /*
         * Method: delRepeatInArray
         * 删除数组中的重复元素。
         *
         * Parameters:
         * arr - {Array} 要进行重复元素删除的数组。
         *
         * Returns:
         * {Array} 无重复元素的数组。
         */
        function delRepeatInArray(arr) {
            var newArray = [];
            var provisionalTable = {};
            for (var i = 0, a; (a = arr[i]) != null; i++) {
                if (!provisionalTable[a]) {
                    newArray.push(a);
                    provisionalTable[a] = true;
                }
            }
            return newArray;
        }

        /*
         * Method: PointInPoly
         * 判断一个点是否在多边形里面。(射线法)
         *
         * Parameters:
         * pt - {Object} 需要判定的点对象，该对象含有属性x(横坐标)，属性y(纵坐标)。
         * poly - {Array(Objecy)}  多边形节点数组。例如一个四边形：[{"x":1,"y":1},{"x":3,"y":1},{"x":6,"y":4},{"x":2,"y":10},{"x":1,"y":1}]。
         *
         * Returns:
         * {Boolean} 点是否在多边形内。
         */
        function isPointInPoly(pt, poly) {
            for (var isIn = false, i = -1, l = poly.length, j = l - 1; ++i < l; j = i)
                ((poly[i].y <= pt.y && pt.y < poly[j].y) || (poly[j].y <= pt.y && pt.y < poly[i].y))
                && (pt.x < (poly[j].x - poly[i].x) * (pt.y - poly[i].y) / (poly[j].y - poly[i].y) + poly[i].x)
                && (isIn = !isIn);
            return isIn;
        }
    }
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