高德地图轨迹回放，消息框内展示车辆速度且随车辆移动-升级支持调整

作者: 一颗北上广的心 | 来源:发表于2019-12-06 18:22 被阅读0次

使用高德地图回放车辆GPS轨迹，并添加速度和回放进度条，并支持调整，效果如下：

示例.gif

新增的功能：

在基础版本，有如下升级

速度条：可以拖动以调整车辆回放速度，且从当前位置继续回放
进度条：进度条表示车辆已回放的百分比，且拖动进度条车辆定位到相应的位置并继续回放

思路分析

高德和marker回放相关的API

//主要靠他回放
moveAlong(path:Array,speed:Number,f:Function,circlable:Boolean)
//点移动到另一个位置，移动进度条车辆跟随移动
moveTo(lnglat:[LngLat],speed:Number, f:Function)
//停止播放
stopMove()
//继续播放 未用到
resumeMove()

未发现可以从指定点开始播放的API，所以只能迂回下了

假设我们得知从第100个点，开始回放；可以停止当前回放，并且从截取100到最后的轨迹点，生成一个临时轨迹，让marker来moveAlong
所以在我们拖动速度条后，需要知道当前回放到哪个点
所以在我们拖动进度条后，需要知道当前回放到哪个点
进度条随车辆回放变化，需要知道当期回放到哪个点，再除以轨迹点总个数以设置回放百分比

所以关键是获取当前回放到哪个点，如下即可解决该问题

AMap.event.addListener(carMarker, 'moving', function (e) {
        console.log("当前已回放: "+ e.passedPath.length)
    });

关于进度条本文用的是 ion.rangeSlider，示例和用法大家可以参考官网，很简单
主要用到如下事件，我写了中文备注，大家也可以参考官网的示例




    $("#demo_0").ionRangeSlider({
        skin: "big",
        min: 0,
        max: 10,
        from: 5,
        onStart: function (data) {
            // fired then range slider is ready
        },
        onChange: function (data) {
            // fired on every range slider update-用鼠标拖动进度条时触发
        },
        onFinish: function (data) {
            // fired on pointer release-用鼠标拖动进度条后，释放鼠标触发
        },
        onUpdate: function (data) {
            // fired on changing slider with Update method-用JS方法更新进度条值后触发
        }
    });

那么实现思路就很清晰了

车辆移动，进度条跟随变化：当前车辆已回放点的个数➗轨迹点总个数（代码137行）
修改速度，车辆从当前位置按新速度回放: 当前车辆停止回放，从当期位置到最后重新生成一段线路，车辆根据新轨迹回放
修改进度，车辆定位到相应位置：根据进度条的百分比✖️轨迹总个数，即可定位到当前百分比对应的轨迹点，将车辆移动到该位置即可（onUpdate事件）
修改进度后，车辆从当前位置回放：根据进度条的百分比✖️轨迹总个数，得到当前位置，生成从当前位置到最后的路径，并回放即可（onFinish事件）

源码如下

<html>
<head>
    <head>
        <!--bootstrap css-->
        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
        <!--rangeSlider css 进度条-->
        <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.3.0/css/ion.rangeSlider.min.css"/>

        <!--jquery js-->
        <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
        <!--bootstrap js-->
        <script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
        <!--Amap js 高德-->
        <script src="https://webapi.amap.com/maps?v=1.3&key=fadee97bdcbf2dde564994f5deef0b58&plugin=AMap.Autocomplete,AMap.Walking,AMap.PlaceSearch,AMap.PolyEditor,AMap.CircleEditor,AMap.Transfer,AMap.Driving,AMap.CitySearch,AMap.Heatmap,AMap.Size" type="text/javascript"></script>
        <script src="https://webapi.amap.com/ui/1.0/main.js?v=1.0.11"></script>
        <!--rangeSlider js 进度条-->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.3.0/js/ion.rangeSlider.min.js"></script>

    </head>

<body class="container">

<div class="row">
    <div class="col-md-12">
        <!--速度条-->
        <div id="ionrange_speed"></div>
    </div>
    <div class="col-md-12">
        <!--进度条-->
        <div id="ionrange_process"></div>
    </div>
    <div class="col-md-12">
        <button type="button" class="btn btn-info pull-right" onclick="carMarker.stopMove()">暂停</button>
        <button type="button" class="btn btn-info pull-right" onclick="playCar()">播放</button>
    </div>
</div>

<div class="row">
    <div class="col-md-12">
        <!--地图-->
        <div id="mapContainer" style="height: 100%;width: 100%;">
        </div>
    </div>
</div>

</body>


<script type="text/javascript">
    var carSpeed = 5000;//移动速度，后面调整速度已这个为基准
    var carMarker; //回放车辆
    var VEHICLE_PLAY_PROCESS = 0; //车辆当前回放到的百分比进度
    var VEHICLE_PATH_REPLAY_START = 0;//当前回放的起点索引, 改变速度和改变进度条的时候，根据进度条百分比重新计算该数值，并从该位置开始再次回放

    // 车辆轨迹、速度数据
    var routeInfo = 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    // 初始化速度条
    var speedSlider = $("#ionrange_speed").ionRangeSlider({
        min: 1,
        max: 10,
        step: 0.5,
        from: 5,
        postfix: "倍",
        prettify: false,
        hasGrid: true,
        onFinish: function (data) {
            if (carMarker) {
                carMarker.stopMove();
            }
            // 拖动速度条，放下后触发： 设定车辆速度为当前指定的速度
            carSpeed = data.from * 1000;
            VEHICLE_PATH_REPLAY_START = Math.round(routeInfo.length * VEHICLE_PLAY_PROCESS / 100);
            playCar();
        },
    });

    // 初始化进度条
    var speedSlider = $("#ionrange_process").ionRangeSlider({
        min: 0,
        max: 100,
        step: 1,
        from: 0,
        postfix: "%",
        prettify: false,
        hasGrid: true,
        onUpdate: function (data) {
            //车辆移动的时候，使用JS方法更新进度条，触发该方法： 记录车辆回放的进度
            VEHICLE_PLAY_PROCESS = data.from;
        },
        onChange: function (data) {
            //手动拖动进度条过程中触发：移动车辆，定位车辆回放位置
            var currentIndex = Math.round(routeInfo.length * data.from / 100);
            var vehicleLocation = routeInfo[currentIndex];
            carMarker.setPosition(new AMap.LngLat(vehicleLocation.lng, vehicleLocation.lat));
        },
        onFinish: function (data) {
            //拖动进度条，确定释放后触发，从当前位置开始回放
            VEHICLE_PLAY_PROCESS = data.from;
            VEHICLE_PATH_REPLAY_START = Math.round(routeInfo.length * VEHICLE_PLAY_PROCESS / 100);
            playCar();
        }
    });

    // 创建地图
    var map = new AMap.Map("mapContainer", {
        view: new AMap.View2D({}),
        lang: "zh_cn"
    });

    // 创建小汽车marker
    var carMarker = new AMap.Marker({
        map: map,
        position: [routeInfo[0].lng, routeInfo[0].lat],
        icon: "http://webapi.amap.com/images/car.png",
        offset: new AMap.Pixel(-26, -13),
        autoRotation: true
    });

    // 创建跟速度信息展示框
    var carWindow = new AMap.InfoWindow({
        offset: new AMap.Pixel(6, -25),
        content: ""
    });

    // 生成路线
    initializePaths(routeInfo);

    //添加监听事件： 车辆移动的时候，更新速度窗体位置，记录当前回放百分比
    AMap.event.addListener(carMarker, 'moving', function (e) {
        var lastLocation = e.passedPath[e.passedPath.length - 1];
        //移动窗体
        carWindow.setPosition(lastLocation);
        //根据gps信息，在源数据中查询当前位置速度
        setVehicleSpeedInWidowns(lastLocation);
        //更新进度条
        $("#ionrange_process").data('ionRangeSlider').update({from: Math.round((e.passedPath.length + VEHICLE_PATH_REPLAY_START) / routeInfo.length * 100)})
    });

    // 打开速度框
    carWindow.open(map, carMarker.getPosition());

    // 地图自适应缩放
    map.setFitView();

    function initializePaths(paths) {
        var line;
        var pathLngLatArray = new Array();
        if (paths) {
            for (var i = 0; i < paths.length; i++) {
                pathLngLatArray.push(new AMap.LngLat(paths[i].lng, paths[i].lat));
            }
            line = new AMap.Polyline({
                map: map,
                path: pathLngLatArray,
                strokeColor: 'red',
                strokeOpacity: 0.8,
                strokeWeight: 6,
                strokeStyle: 'solid'
            });
            line.setMap(map);
        }
        return line;
    }

    function setVehicleSpeedInWidowns(lnglat) {
        for (var i = 0; i < routeInfo.length; i++) {
            if (lnglat.distance(new AMap.LngLat(routeInfo[i].lng, routeInfo[i].lat)) < 4) {
                carWindow.setContent("速度:" + (routeInfo[i].speed * 1.852).toFixed(2) + "公里/时");
                return;
            }
        }

    }

    // 车辆开始回放
    function playCar() {
        if (carMarker) {
            carMarker.stopMove();
        }

        //计算需要回放的GPS路径
        var replayPath = [];
        for (var i = VEHICLE_PATH_REPLAY_START; i < routeInfo.length; i++) {
            replayPath.push(new AMap.LngLat(routeInfo[i].lng, routeInfo[i].lat));
        }
        carMarker.moveAlong(replayPath, carSpeed, function (k) {
            return k
        }, false);
    }

</script>


</html>

高德地图轨迹回放，消息框内展示车辆速度且随车辆移动-升级支持调整

新增的功能：

思路分析

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