var CalcVol = {
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upPos: [],
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downPos: [],
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upClipPos: [], //上表面最低点集合
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downClipPos: [], //下表面最高点集合
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upMinHight: -Infinity, //上表面最低点高度值
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downMaxHight: Infinity, //下表面最高点高度值
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upVolume: 0,
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centerVolume: 0,
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downVolume: 0,
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init: function (upPos, downPos) {
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this.initData(upPos, downPos);
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this.clipUpByPoint();
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this.clipBottomByPoint();
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this.createUpSolid();
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this.createDownSolid();
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var s1 = this.calculateUpVolume();
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var s2 = this.calculateDownVolume();
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return this.calculateCenterVolume(s2.height, s2.bottom);
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},
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initData: function (upPos, downPos) {
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this.upPos = upPos;
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this.downPos = downPos;
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this.upClipPos = [];
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this.downClipPos = [];
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this.upMinHight = -Infinity;
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this.downMaxHight = Infinity;
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this.upVolume = 0;
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this.centerVolume = 0;
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this.downVolume = 0;
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},
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// 上表面水平切割
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clipUpByPoint: function () {
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this.upPos.sort(this.compare("z"));
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this.upMinHight = this.upPos[0].z;
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var upClipPoints = [];
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for (var i = 0; i < this.upPos.length; i++) {
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var upEle = this.upPos[i];
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var x = upEle.x;
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var y = upEle.y;
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var z = this.upMinHight;
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this.upClipPos.push({ x: x, y: y, z: z });
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upClipPoints.push(x, y, z);
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}
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},
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// 下表面水平切割
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clipBottomByPoint: function () {
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this.downPos.sort(this.compare("z"));
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this.downMaxHight = this.downPos[this.downPos.length - 1].z;
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var downClipPoints = [];
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for (var i = 0; i < this.downPos.length; i++) {
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var downEle = this.downPos[i];
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var x = downEle.x;
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var y = downEle.y;
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var z = this.downMaxHight;
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this.downClipPos.push({ x: x, y: y, z: z });
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downClipPoints.push(x, y, z);
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}
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},
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// 创建上半部分空间体
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createUpSolid: function () {
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var vertex = this.upPos[0];
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var upSolidPolygonPoints = [];
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var fourpoints0 = [];
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var fourpoints1 = [];
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for (var i = 1; i < this.upPos.length; i++) {
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var upEle = this.upPos[i];
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var upClipEle = this.upClipPos[i];
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var upClipEle1 = this.upClipPos[this.upPos.length - i];
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fourpoints0.push(upEle.x, upEle.y, upEle.z);
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fourpoints1.push(upClipEle1.x, upClipEle1.y, upClipEle1.z);
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var curPolygonPoints = [
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vertex.x,
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vertex.y,
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vertex.z,
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upEle.x,
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upEle.y,
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upEle.z,
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upClipEle.x,
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upClipEle.y,
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upClipEle.z,
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];
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upSolidPolygonPoints.push(curPolygonPoints);
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}
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var fourpoints = fourpoints0.concat(fourpoints1); //上半部分顶点对应的那个面的四个顶点
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upSolidPolygonPoints.push(fourpoints);
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for (var n = 0; n < upSolidPolygonPoints.length; n++) {
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var element = upSolidPolygonPoints[n];
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}
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},
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// 创建下半部分空间体
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createDownSolid: function () {
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var vertex = this.downPos[this.downPos.length - 1];
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var downSolidPolygonPoints = [];
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var fourpoints0 = [];
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var fourpoints1 = [];
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for (var i = 0; i < this.downPos.length - 1; i++) {
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var downEle = this.downPos[i];
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var downClipEle = this.downClipPos[i];
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var downClipEle1 = this.downClipPos[this.downPos.length - 2 - i];
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fourpoints0.push(downEle.x, downEle.y, downEle.z);
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fourpoints1.push(downClipEle1.x, downClipEle1.y, downClipEle1.z);
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var curPolygonPoints = [
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vertex.x,
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vertex.y,
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vertex.z,
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downEle.x,
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downEle.y,
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downEle.z,
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downClipEle.x,
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downClipEle.y,
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downClipEle.z,
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];
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downSolidPolygonPoints.push(curPolygonPoints);
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}
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var fourpoints = fourpoints0.concat(fourpoints1); //下半部分顶点对应的那个面的四个顶点
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downSolidPolygonPoints.push(fourpoints);
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for (var n = 0; n < downSolidPolygonPoints.length; n++) {
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var element = downSolidPolygonPoints[n];
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}
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},
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// 计算上半部分体积//四棱锥体积计算公式：体积=底面积*高/3
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calculateUpVolume: function () {
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// 底面积=（上底+下底）*高/2，上底长度和下底长度
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//console.log("计算上半部分的底面积：", this.upPos, this.upClipPos);
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var clipLine = [];
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var upAndDownDistance = 0;
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for (var i = 1; i < this.upPos.length; i++) {
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var upEle = this.upPos[i];
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var upClipEle = this.upClipPos[i];
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clipLine.push(upClipEle);
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var distance = this.getSpaceDistance(upEle, upClipEle);
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//console.log("底面上下底边长度" + i, distance);
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upAndDownDistance += distance;
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}
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var height = this.getSpaceDistance(clipLine[0], clipLine[1]);
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//console.log("底面的高", height);
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var bottomArea = (upAndDownDistance * height) / 2;
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//console.log("底面积", bottomArea);
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//高
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var pt = turf.point([this.upClipPos[0].x, this.upClipPos[0].y]);
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var line = turf.lineString([
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[this.upClipPos[1].x, this.upClipPos[1].y],
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[this.upClipPos[2].x, this.upClipPos[2].y],
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]);
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var heightDistance = turf.pointToLineDistance(pt, line) * 1000;
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//console.log("顶点到底面的高：", heightDistance);
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this.upVolume = (bottomArea * heightDistance) / 3;
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//console.log("上半部分体积（黄色）：", this.upVolume);
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return { height: heightDistance, bottom: height };
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},
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// 计算下半部分体积//四棱锥体积计算公式：体积=底面积*高/3
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calculateDownVolume: function () {
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// 底面积=（上底+下底）*高/2
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// 上底长度和下底长度
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//console.log("计算下半部分的底面积：", this.downPos, this.downClipPos);
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var clipLine = [];
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var upAndDownDistance = 0;
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for (var i = 0; i < this.downPos.length - 1; i++) {
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var upEle = this.downPos[i];
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var upClipEle = this.downClipPos[i];
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clipLine.push(upClipEle);
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var distance = this.getSpaceDistance(upEle, upClipEle);
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//console.log("底面上下底边长度" + i, distance);
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upAndDownDistance += distance;
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}
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var height = this.getSpaceDistance(clipLine[0], clipLine[1]);
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//console.log("底面的高", height);
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var bottomArea = (upAndDownDistance * height) / 2;
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//console.log("底面积", bottomArea);
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//高
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var pt = turf.point([this.downClipPos[2].x, this.downClipPos[2].y]);
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var line = turf.lineString([
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[this.downClipPos[0].x, this.downClipPos[0].y],
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[this.downClipPos[1].x, this.downClipPos[1].y],
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]);
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var heightDistance = turf.pointToLineDistance(pt, line) * 1000;
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//console.log("顶点到底面的高：", heightDistance);
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this.downVolume = (bottomArea * heightDistance) / 3;
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//console.log("下半部分体积（绿色）：", this.downVolume);
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return { height: heightDistance, bottom: height };
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},
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// 计算中间部分体积//三棱柱体积计算公式：体积=底面积*高
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//height：三棱柱底面三角形的高，bottom：三棱柱底面三角形的底边
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calculateCenterVolume: function (height, bottom) {
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//底面积
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var area = (height * bottom) / 2;
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//console.log("底面三角形面积：", area);
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var h = Math.abs(this.upClipPos[0].z - this.downClipPos[2].z); //三棱柱高
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this.centerVolume = area * h;
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//console.log("中间部分三棱柱体积：", this.centerVolume);
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var volume = this.upVolume + this.downVolume + this.centerVolume;
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//console.log("当前空间立方体的体积是(m³)：", volume);
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return volume;
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},
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// 空间两点间距离，单位m
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getSpaceDistance: function (pos1, pos2) {
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var h = Math.abs(pos1.z - pos2.z);
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var from = turf.point([pos1.x, pos1.y]);
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var to = turf.point([pos2.x, pos2.y]);
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var distance = turf.distance(from, to); //这里计算出来的单位是km，要转换成m，所以后面开平方的时候*1000
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var result = Math.sqrt(Math.pow(distance * 1000, 2) + Math.pow(h, 2));
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return result;
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},
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//数组根据某一字段从高到低排序
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compare: function (property) {
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return function (a, b) {
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var value1 = a[property];
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var value2 = b[property];
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return value1 - value2;
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};
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}
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};
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