标签：polygon holes polygonString let Cesium multiPolygon data dataArray Polygon
为了逻辑清晰，我把代码分成了如下几部分，亲测可用
1)首先区分是polygon还是multiPolygon，若为multpolygon,则首先把multpolygon拆分为多个polygon,然后循环，把polygon字符串上球
addMultiPolygon(polygonString) {
this.clearAll(); // 清空球上实体
// polygonString 可能以multiPolygon,或者polygon开头
// 若字符串以MulitPolyGon开头
if (polygonString.startsWith("MULTIPOLYGON")) {
let polyganList = this.multPolyganToList(polygonString); // 把multipolygon处理成多个polygon
polyganList.forEach((polygon)=>{
this.addPolygon(polygon);
})
this.viewer.zoomTo(this.viewer.entities);
}
else {
this.addPolygon(polygonString);
this.viewer.zoomTo(this.viewer.entities);
}
},
2）把mulitPolygon字符串处理成polygon字符串数组
// 把multiPolygon处理成多个polygon
multPolyganToList(data) {
let ployganStringList = [];
let tempData = data.slice(16,data.length-3);
let tempPloyganList = tempData.split(')), ((');
tempPloyganList.forEach((val)=>{
let polygan = "POLYGON ((" + val + "))";
ployganStringList.push(polygan);
return ployganStringList;
},
3）把polygon字符串上球，polygon中可能含有hole，因此需要单独处理，把polygon字符串处理成多个polygon字符串，然后上球
// polygon中可能包含hole，因此需要做判断
addPolygon(polygonString) {
if(polygonString === 'POLYGON ((-180 -90, -180 90, 180 90, 180 -90, -180 -90))') {
this.$message.warning('该类数据覆盖全球');
return;
}
if(polygonString.indexOf('), (')!=-1) {
let polyganList = this.PolyganToList(polygonString); // POLYGON处理成多个polygon
let dataArray = polyganList[0];
let holes = []
for (let i = 1;i < polyganList.length; i++) {
holes.push({
positions: Cesium.Cartesian3.fromDegreesArray(polyganList[i]),
}, )
}
this.addPolygonWithHoles(dataArray,this.viewer,holes)
} else {
let polygon = this.wktToPolygonArray(polygonString);
this.addPolygonPlane(polygon,this.viewer);
}
},
4）polygon中可能包含holes，若存在holes，把polygon字符串再处理成多个polygon字符串的列表
// polygon中包含多个polygon
PolyganToList(data) {
let ployganList = [];
let tempData = data.slice(10,data.length-2);
let tempPloyganList = tempData.split(')), ((');
tempPloyganList.forEach((val)=>{
if(val.indexOf('), (')!=-1) {
let itemList = val.split('), (');
itemList.forEach((item)=>{
let itemPolygon = "POLYGON ((" + item + "))";
ployganList.push(this.wktToPolygonArray(itemPolygon));
})
}
})
return ployganList;
},
5）把单个polygon转成cesium可以上球的数据
// 单个polygon转cesium可上球的数据
wktToPolygonArray(data) {
let dataArray = [];
let tempData = data.slice(10,data.length-2);
let pointArray = tempData.split(', ');
pointArray.forEach((val)=>{
let l = val.split(' ');
dataArray.push(Number(l[0]));
dataArray.push(Number(l[1]));
})
return dataArray;
},
// 添加多边形plane为holes
// polygon中会有holes
addPolygonWithHoles(dataArray,viewer,holes) {
viewer.entities.add({
name: "Blue polygon with holes",
polygon: {
hierarchy: {
positions: Cesium.Cartesian3.fromDegreesArray(dataArray),
holes: holes
},
material: Cesium.Color.CORNFLOWERBLUE.withAlpha(0.4),
height: 0,
outline: true, // height is required for outline to display
outlineColor: Cesium.Color.DODGERBLUE,
},
});
},
标签：polygon,holes,polygonString,let,Cesium,multiPolygon,data,dataArray,Polygon 来源： https://www.cnblogs.com/hustshu/p/14879692.html
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