Vue+高德地圖巡航軌跡，實現軌跡回放加進度條，加減速

應公司業務要求，給軌跡回放加個滾動條，一開始我採用的是高德地圖的折線繪製，可是若是要加上進度條並不太不合適，拖動滾動條，點位沒有恢復的API，後來決定使用巡航軌跡，巡航軌跡支持更豐富的軌跡API，使用起來也更方便。

下面是作完的效果圖：

 

 

 

使用的技術有：vue，高德地圖1.4（amap），element-UI

下面的是部分源碼：

html部分

<template>
  <div id="demo">
    <div id="test-map" />
    <!--控制條-->
    <div class="map-control" v-show="isActual">
      <!--播放暫停按鈕-->
      <Icon
        v-if="!isPlay"
        class="play-icon"
        type="ios-play"
        @click="isPlay=true;navgControl('start')"
      />
      <Icon v-else class="play-icon" type="ios-pause" @click="isPlay=false;navgControl('pause')"/>
      <!--已播放時間-->
      <span class="passed-time">{{passedTime}}</span>
      <!--進度條-->
      <el-slider v-model="sliderVal" :format-tooltip="hideFormat" :step="0.0001"></el-slider>
      <!--倍速-->
      <div class="map-times" @mouseenter="isTimesChoose=true" @mouseleave="isTimesChoose=false">
        <div class="times-show">倍速 {{times}}</div>
        <div class="choose-box">
          <ul v-show="isTimesChoose">
            <li v-for="item in speedList" :key="item.value" :class="{active:times==item.value}" @click="changeSpeed(item.value)">{{item.label}}</li>
          </ul>
        </div>
      </div>
      <!--結束時間-->
      <span class="passed-time">{{totalTime}}</span>
    </div>
  </div>
</template>

JS處理部分：

1.初始化地圖：

lazyAMapApiLoaderInstance.load().then(() => { this.map = new AMap.Map('test-map', { zooms: [13, 18], // 地圖縮放範圍
          center: new AMap.LngLat(116.397428, 39.90923) }) this.initPathSimplifier() })

2.初始化組件實例

// 初始化組件實例
 initPathSimplifier() { let that = this AMapUI.load(['ui/misc/PathSimplifier'], (PathSimplifier) => { if (!PathSimplifier.supportCanvas) { alert('當前環境不支持 Canvas！') return }
          //建立一個巡航軌跡路線
          that.pathSimplifierIns = new PathSimplifier({ zIndex: 100,//地圖層級，
            map: this.map, //所屬的地圖實例
            //巡航路線軌跡列表
            getPath: (pathData, pathIndex) => { return pathData.path; }, //hover每個軌跡點，展現內容
            getHoverTitle: function(pathData, pathIndex, pointIndex) { if (pointIndex >= 0) { return pathData.name + '，點：' + pointIndex + '/' + pathData.path.length; } return pathData.name + '，點數量' + pathData.path.length; }, //自定義樣式，可設置巡航器樣式，巡航軌跡樣式，巡航軌跡點擊、hover等不一樣狀態下的樣式，不設置則用默認樣式，詳情請參考api文檔 renderOptions:{}
            //繪製路線節點
 renderOptions: { renderAllPointsIfNumberBelow: 100 //繪製路線節點，如不須要可設置爲-1
 } }); //設置數據
 that.pathSimplifierIns.setData([{ name: '路線0', path: that.actualList }]); //對第一條線路（即索引 0）建立一個巡航器
          that.navgtr = that.pathSimplifierIns.createPathNavigator(0, { loop: false, //循環播放
            speed: that.navgtrSpeed //巡航速度，單位公里/小時
 }); that.navgtr.on("start resume", function() { that.navgtr._startTime = Date.now(); that.navgtr._startDist = this.getMovedDistance(); }); that.navgtr.on("stop pause", function() { that.navgtr._movedTime = Date.now() - that.navgtr._startTime; that.navgtr._movedDist = this.getMovedDistance() - that.navgtr._startDist; }); that.navgtr.on("move", function(data,position) { let idx = position.dataItem.pointIndex //走到了第幾個點
            let tail = position.tail //至下一個節點的比例位置
            let totalIdx = idx + tail let len = position.dataItem.pathData.path.length // 計算下一個距離速度
            if (idx < len - 1) {
              that.navgtr.setSpeed(that.navgtrSpeed * that.times); } // 進度條實時展現tail
            !that.isOnSlider && (that.sliderVal = (totalIdx / len) * 100);
            // 若是到頭了，回到初始狀態
            if (that.navgtr.isCursorAtPathEnd()) { that.playIcon = "start"; that.isPlay = false; that.sliderVal = 0; that.passedTime = that.totalTime; } }); }) },

3.關鍵方法，控制車輛跟隨進度條移動

sliderChange(val){ let newVal = typeof(newVal)==='number' ? val : this.sliderVal let num = parseInt((newVal / 100) * this.actualList.length); let decimal = String((newVal / 100) * this.actualList.length).split('.')[1]||0
        this.navgtr.moveToPoint(num, Number('0.'+decimal)); this.pathSimplifierIns.renderLater(); },

4.對滑塊設置監聽

watch:{ sliderVal(newVal) { if (!this.isOnSlider) { return false; } this.sliderChange(newVal) } },

let that = this;
let el = document.getElementsByClassName("el-slider__button-wrapper")[0];
let el2 = document.getElementsByClassName("el-slider__runway")[0];
el2.addEventListener("click", that.sliderChange,false);
el.addEventListener("mousedown", that.openSlider,false);
// 此處用document是由於，滑動較爲隨意時，mouseup可能不是做用在el上
document.addEventListener("mouseup",that.closeSlider,false);

參考博客：https://blog.csdn.net/weixin_40579884/article/details/89675275