基于javascript实现获取最短路径算法代码实例-创新互联
这篇文章主要介绍了基于javascript实现获取最短路径算法代码实例,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
创新互联建站是一家以网站建设、网页设计、品牌设计、软件运维、seo优化、小程序App开发等移动开发为一体互联网公司。已累计为成都假山制作等众行业中小客户提供优质的互联网建站和软件开发服务。代码如下
//A算法 自动寻路 路径 class GetAutoPath{ constructor(id, map, sPos, ePos, mapArr){ //this.type = id.type; this.id = id; this.map = map; this.sPos = sPos; this.ePos = ePos; this.mapArr = mapArr; this.maxMach = 10000; this.openArr = []; this.closeArr = []; this.minPath = []; if(!this.isPath(this.sPos.x, this.sPos.y)){this.sPos = this.getNewDot(sPos, ePos);} if(!this.isPath(this.ePos.x, this.ePos.y)){this.ePos = this.getNewDot(ePos, sPos);} //console.log(this.mapArr); return this.run(); } posts(txt, arr){//post消息 //let id = this.id, sPos = this.sPos, ePos = this.ePos, arrs = arr || []; return {id:this.id, map:this.map, arr:arr || [], sPos:this.sPos, ePos:this.ePos, txt:txt} } isPath(x, y){//isPath = true 合法路径 = isBanPath === undefined let isPath = false, ym = this.mapArr.get(y), xm; //console.log(ym); debugger; if(ym !== undefined){ xm = ym.get(x); if(xm !== undefined){ if(xm.isBanPath === undefined){isPath = true;} } } //if(this.mapArr[y] !== undefined && this.mapArr[y][x] !== undefined && this.mapArr[y][x].isPath === 1){isPath = true;} return isPath; } getEqual(arr, x, y){//获取目标数组相同的坐标 let isPos = false; if(arr.length === 0){ isPos = false; }else{ isPos = arr.some(function (o){return o.x === x && o.y === y;}); } return isPos; } getDot(x, y){//获取周围8个方向坐标 return [{x:x-1,y:y},{x:x+1,y:y},{x:x,y:y-1},{x:x,y:y+1},{x:x-1,y:y-1},{x:x+1,y:y+1},{x:x+1,y:y-1},{x:x-1,y:y+1}] } getNewDot(setPos, pos){//重定义起点或终点 let dot = setPos, pointDot, k, arr = [], arrs = [], g, end, maxMachT = 0; while(!end && maxMachT < this.maxMach){ maxMachT++; pointDot = this.getDot(dot.x, dot.y); for(k in pointDot){ g = Math.round(Math.sqrt(Math.abs(pointDot[k].x - pos.x) + Math.abs(pointDot[k].y - pos.y)) * 100) / 100; if(!this.isPath(pointDot[k].x, pointDot[k].y)){//不合法 arr.push({x:pointDot[k].x, y:pointDot[k].y, g:g}); arr.sort(function(a, b){return a.g - b.g;}); }else{//合法 arrs.push({x:pointDot[k].x, y:pointDot[k].y, g:g}); arrs.sort(function(a, b){return a.g - b.g;}); } if(arrs.length > 0){end = true;} } dot = {x:arr[0].x, y:arr[0].y, g:arr[0].g}; arr = []; } if(!arrs[0].x || !arrs[0].y){return this.posts("没有符合的坐标");} return {x:arrs[0].x, y:arrs[0].y}; } run(){ if(this.sPos.x === undefined || this.ePos.x === undefined){return this.posts("没有符合的坐标");} let sPos = this.sPos, ePos = this.ePos, point, key, i, newPoint, ger, gers, g, h, f, maxMachT = 0; this.openArr[0] = {x : sPos.x, y : sPos.y, f : 0, p : 0, ger : 0} while(this.openArr.length > 0){ maxMachT++; point = this.openArr[0]; this.closeArr.push(point); this.openArr.splice(0,1); key = this.closeArr.length - 1;//设置当前节点 newPoint = this.getDot(point.x, point.y);//获取周围点 for(i in newPoint){//设置周围点 ger = Math.round(Math.sqrt(Math.abs(newPoint[i].x - point.x) + Math.abs(newPoint[i].y - point.y)) * 100) / 100;//到当前节点的曼哈顿距离,保留两位小数点 gers = ger + point.ger; g = Math.round(gers * 100) / 100; h = Math.abs(newPoint[i].x - ePos.x) + Math.abs(newPoint[i].y - ePos.y); f = g + h; if(this.isPath(newPoint[i].x, newPoint[i].y) && !this.getEqual(this.openArr, newPoint[i].x, newPoint[i].y) && !this.getEqual(this.closeArr, newPoint[i].x, newPoint[i].y)){this.openArr.push({x:newPoint[i].x, y:newPoint[i].y, f:f, p:key, ger:ger});} } this.openArr.sort(function(a, b){return a.f - b.f;});//排序 if(this.getEqual(this.closeArr, ePos.x, ePos.y) || this.getEqual(this.openArr, ePos.x, ePos.y)){//end this.minPath.unshift(this.closeArr[key]); while(this.minPath.length > 0){ if(this.minPath[0].p == 0){return this.posts('success', this.minPath);}else{this.minPath.unshift(this.closeArr[this.minPath[0].p]);} } }else if(maxMachT === this.maxMach){ return this.posts("没有符合的坐标"); } } return this.posts("没有符合的坐标"); } }
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