按轨迹行走的小车ECharts Gallery

20:11:45图表已生成
代码
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function getAngle(n, next) {
    var ret
    var w1 = n[1] / 180 * Math.PI
    var j1 = n[0] / 180 * Math.PI

    var w2 = next[1] / 180 * Math.PI
    var j2 = next[0] / 180 * Math.PI

    ret = 4 * Math.pow(Math.sin((w1 - w2) / 2), 2) - Math.pow(Math.sin((j1 - j2) / 2) * (Math.cos(w1) - Math.cos(w2)), 2);
    ret = Math.sqrt(ret);

    // var temp = Math.sin(Math.abs(j1 - j2) / 2) * (Math.cos(w1) + Math.cos(w2));
    var temp = Math.sin((j1 - j2) / 2) * (Math.cos(w1) + Math.cos(w2));
    //console.log(temp)
    ret = ret / temp;

    ret = Math.atan(ret) / Math.PI * 180;
    ret += 90;

    // 这里用如此臃肿的if..else是为了判定追踪单个点的具体情况,从而调整ret的值
    if (j1 - j2 < 0) {
        // console.log('j1<j2')
        if (w1 - w2 < 0) {
            // console.log('w1<w2')
            ret;
        } else {
            // console.log('w1>w2')
            ret = -ret + 180;
        }
    } else {
        // console.log('j1>j2')
        if (w1 - w2 < 0) {
            // console.log('w1<w2')
            ret = 180 + ret;
        } else {
            // console.log('w1>w2')
            ret = -ret;
        }
    }
    return ret;
}
var cursetpindex = 0;
doshow();

function doshow() {
    var busLines = [{
        "coords": arrpoints,
        "lineStyle": {
            "normal": {
                "color": 'red'
            }
        }
    }];
    var arrpoints2 = [];
    var curstop = null;
    if (cursetpindex) {
        for (var i = 0; i <= cursetpindex; i++) {
            if (i == cursetpindex) {
                curstop = arrpoints[i];
            }
            arrpoints2.push(arrpoints[i]);
        }
    } else {
        curstop = arrpoints[0];
    }
    var busLinecur = [{
        "coords": arrpoints2,
        "lineStyle": {
            "normal": {
                "color": 'blue'
            }
        }
    }];
    var option = {
        bmap: {
            center: [116.361729, 39.945501],
            zoom: 14,
            roam: true,
            mapStyle: mapStyle
        },
        series: [{
            name: "busLines",
            type: 'lines',
            coordinateSystem: 'bmap',
            polyline: true,
            data: busLines,
            silent: true,
            lineStyle: {
                normal: {
                    // color: '#c23531',
                    // color: 'rgb(200, 35, 45)',
                    opacity: 0.4,
                    width: 3
                }
            },
            progressiveThreshold: 500,
            progressive: 200
        }]
    };
    if (busLinecur && busLinecur[0] && busLinecur[0].coords && busLinecur[0].coords.length) {
        option.series.push({
            name: "busLinecur",
            type: 'lines',
            coordinateSystem: 'bmap',
            polyline: true,
            data: busLinecur,
            lineStyle: {
                normal: {
                    width: 3
                }
            },
            effect1: {
                constantSpeed: 40,
                show: true,
                trailLength: 0,
                symbolSize: 10
            },
            zlevel: 1
        })
    }
    //http://lbsyun.baidu.com/jsdemo/img/car.png
    /* option.series.push({
         name:"changedot",
         type:'effectScatter',
         coordinateSystem:'bmap',
         data:[
             {"name":"北京","value":curstop}
         ],
         symbolSize:10,
         itemStyle:{
             emphasis:{
                 borderColor:'blue',
                 borderWidth:2
             }
         }
     });*/
    var nextindex = 0;
    if (cursetpindex + 1 >= arrpoints.length - 1) {
        nextindex = arrpoints.length - 1;
    } else {
        nextindex = cursetpindex + 1;
    }
    var nextstop = arrpoints[nextindex];
    var jiaodu = -getAngle(curstop, nextstop) + 90; //根据 nextstop和curstop 获取角度
    option.series.push({
        name: "changedot",
        type: 'scatter',
        coordinateSystem: 'bmap',
        data: [{
            "name": "北京",
            "value": curstop
        }],
        symbol: "image://https://tbfile.oss-cn-beijing.aliyuncs.com/image/car.png",
        symbolSize: [52, 26],
        symbolRotate: jiaodu,
        itemStyle: {
            emphasis: {
                borderColor: 'blue',
                borderWidth: 2
            }
        }
    });
    myChart.setOption(option);
}
setInterval(function() {
    if (cursetpindex == arrpoints.length - 1) {
        cursetpindex = 0;
    } else if (cursetpindex + 1 >= arrpoints.length - 1) {
        cursetpindex = arrpoints.length - 1;
    } else {
        cursetpindex += 1;
    }
    doshow();
}, 0.1 * 1000)
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