高德地圖大批量資料（上萬）畫歷史軌跡實現方案
阿新 • • 發佈：2018-11-05
轉載請註明出處：https://www.cnblogs.com/Joanna-Yan/p/9896180.html
需求：裝置傳回伺服器的軌跡點，需要在web地圖上顯示。包括畫座標點覆蓋物、軌跡路線圖。當資料量達到一定量時，介面出現卡頓。問題出現幾天前端人員都未解決。
第一反應，大量的覆蓋物肯定不能直接新增在地圖上。每一個地圖物件或者圖層能新增的覆蓋物物件都是有限的，資源也是有限的。
能否通過建立多個圖層去畫覆蓋物，同時根據地圖的縮放級別來動態新增和減少覆蓋物的數量。
好了，研究高德地圖api。
1.首先找到一個海量點展示組建PointSimplifier。可以在地圖上展示數量為十萬以內的點並且效能表現較好，這點正好符合我們的需求。
它實際上是由海量點組成的一個地圖圖層，這點符合前面我們說的解決思路。
2.找到一個軌跡展示組建PathSimplifier 。同理上。
既然兩個組建都可以支援大量資料，並且自動建立圖層，那麼我們完全可以把PointSimplifier和PathSimplifier通過圖層疊加起來使用，分別實現我們的畫點和畫軌跡的需求。
先看效果圖：
模擬上萬點，地圖隨意縮放、移動不會出現卡頓問題。效能表現良好。
簡單示例程式碼如下，自行根據需要優化：
<!-- 重點：getRenderOptions -->
<!doctype html>
<html lang="zh-CN">
<head>
<!-- 原始地址：//
AMapUI.load(['ui/misc/PointSimplifier', 'lib/$'], function(PointSimplifier, $) {
if (!PointSimplifier.supportCanvas) {
alert('當前環境不支援 Canvas！');
return;
}
var pointSimplifierIns = new PointSimplifier({
zIndex: 115,
autoSetFitView: false,
map: map, //所屬的地圖例項
getPosition: function(item) {
if (!item) {
return null;
}
var parts = item.split(',');
return [parseFloat(parts[0]), parseFloat(parts[1])];
},
getHoverTitle: function(dataItem, idx) {
return '序號: ' + idx;
},
//使用GroupStyleRender
renderConstructor: PointSimplifier.Render.Canvas.GroupStyleRender,
renderOptions: {
//點的樣式
pointStyle: {
fillStyle: 'red',
width: 5,
height: 5
},
getGroupId: function(item, idx) {
var parts = item.split(',');
//按緯度區間分組
return Math.abs(Math.round(parseFloat(parts[1]) / 3));
},
groupStyleOptions: function(gid) {
return {
pointStyle: {
fillStyle: colors[gid % colors.length]
}
};
}
}
});
$('<div id="loadingTip">載入資料，請稍候...</div>').appendTo(document.body);
$.get('https://a.amap.com/amap-ui/static/data/10w.txt', function(csv) {
var data = csv.split('\n');
pointSimplifierIns.setData(data);
$('#loadingTip').remove();
//startAnim();
});//畫線=====================================================
AMapUI.load(['ui/misc/PathSimplifier', 'lib/$'], function(PathSimplifier, $) {
if (!PathSimplifier.supportCanvas) {
alert('當前環境不支援 Canvas！');
return;
}
var pathSimplifierIns2 = new PathSimplifier({
zIndex: 100,
//autoSetFitView:false,
map: map, //所屬的地圖例項
getPath: function(pathData, pathIndex) {
return pathData.path;
},
getHoverTitle: function(pathData, pathIndex, pointIndex) {
if (pointIndex >= 0) {
//point
return pathData.name + '，點：' + pointIndex + '/' + pathData.path.length;
}
return pathData.name + '，點數量' + pathData.path.length;
},
renderOptions: {
renderAllPointsIfNumberBelow: 100 //繪製路線節點，如不需要可設定為-1
}
});
window.pathSimplifierIns = pathSimplifierIns2;
//設定資料，模擬路線資料
pathSimplifierIns2.setData([{
name: '路線0',
path: [
[113.864691,22.942327],[120.412618,36.382612],[113.370643,22.938827],[113.001181,23.120518],[112.985037,23.15046],[113.890205,22.798043],[110.361899,20.026695],[113.682288,34.618975],
[121.434529,31.215641],[109.488707,18.309754],[120.682502,28.011099],[120.68556,30.912366],[126.687123,45.787618],[120.48506,30.053066],[103.970724,30.397931],[117.270073,37.96162],[117.212164,31.831641],
[120.256218,31.882242],[121.411101,31.059407],[113.336586,33.729581],[104.137953,30.784276],[114.141516,23.159282],[120.499683,30.042305],[120.487242,32.180365],[108.94686,34.362975],[121.299895,31.105064],
[112.873295,22.920901],[114.164329,22.644532],[113.373916,23.086728],[120.282954,30.196059],[113.250159,23.075847],[121.145445,31.193621],[116.675933,39.986343],[120.896422,31.472813],[120.75997,31.734934],
[118.782607,32.00381],[118.314741,32.26999],[105.268729,23.732875],[111.723311,34.771838],[119.537126,26.200017],[119.953287,37.165859],[113.830123,23.00734],[100.70191,25.408898],[119.273795,26.060002],
[121.373427,31.188567],[116.466752,39.951042],[119.276396,33.761172],[114.20716,22.777829],[115.690291,25.098436],[126.118338,45.11481],[117.668326,30.683932],[16.366324,39.781077],
[106.563101,29.583974],[120.377998,31.578216],[112.50952,37.899569],[116.611935,23.66941],[121.07145,31.10094],[103.787344,30.940037],[116.161048,31.977315],[112.911223,23.164952],[113.90795,22.473978],
[121.946335,39.403784],[120.44004,31.561242],[120.172545,36.009391],[117.3571,31.859773],[126.609854,45.722514],[113.448233,22.652566],[120.531699,32.402873],[102.911877,25.091979],[118.914313,32.013572],
[114.842647,28.133165],[126.597762,45.739299],[114.876072,33.773379],[106.540999,29.520217],[119.437188,32.440656],[114.033057,22.733424],[119.342481,26.050688],[104.041129,30.598338],[113.931555,22.607629],
[119.917693,32.484184],[113.072203,27.813351],[118.371124,35.082682],[116.512489,39.822105],[120.926368,31.320681],[113.714414,27.200748],[120.355238,31.557524],[118.178065,39.817421],[101.775209,36.614975],
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[115.701728,24.066784],[113.360297,22.962038],[104.061447,30.67089],[121.208556,31.421659],[121.123465,31.134162],[121.460029,28.655284],[104.039519,30.719365],[121.444419,28.345353],[116.625662,39.619879],
[121.300635,31.140721],[108.20204,28.004321],[116.084446,28.336149],[113.606513,34.807402],[113.012481,23.02401],[120.213822,30.112851],[121.384539,28.411516],[120.727637,27.798264],[114.556304,33.470221],
[116.452761,39.951122],[115.853758,28.661246],[119.555363,39.932751],[113.978576,22.526649],[120.227111,30.347169],[107.380653,30.314754],[113.377157,31.797137],[109.801429,39.601562],[113.334007,23.107744],
[103.984839,30.68303],[112.641848,22.362319],[104.021757,30.559601],[102.672195,24.974215],[116.729346,23.366757],[120.190691,30.305693],[121.306044,37.479827],[117.023543,36.679076],[119.89984,32.866023],
[118.868849,31.918515],[125.227551,43.904597],[121.473372,31.235574],[121.659163,31.155906],[116.526635,37.131774],[112.559441,34.628217],[113.294417,23.159512],[106.749029,26.5651],[120.163756,30.39902],
[116.151391,39.161228],[121.640998,38.908202],[123.390898,41.771258],[112.767577,22.445482],[113.617148,34.988813],[117.287658,31.873351],[109.132634,34.586277],[117.219603,39.211753],[118.74152,37.460401],
[113.859931,22.971467],[120.206068,30.208895],[112.438353,34.666416],[117.395952,36.673017],[120.415793,36.059608],[113.310853,23.349535],[120.704291,31.825364],[115.714215,37.811101],[118.143882,24.700477],
[113.614631,23.163728],[119.364493,32.328944],[119.959327,36.602313],[121.294195,31.888728],[121.622863,31.294265],[113.365022,22.57829],[121.554824,29.826937],[120.054198,30.664807],[113.995265,22.732452],
[87.658551,44.008315],[116.331976,39.737524],[112.541595,26.763181],[118.595855,24.870478],[115.471106,30.787118],[119.306067,26.102443],[125.265486,43.869571],[117.193445,36.928664],[116.644049,39.807311],
[114.434623,22.801886],[112.702588,22.00886],[118.029471,24.49537],[120.430282,29.365092],[111.171333,37.520834],[114.04317,22.562925],[116.657001,39.89937],[121.22947,31.016796],[113.781089,34.819949],
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[118.868438,32.022459],[113.000335,23.261914],[116.266745,40.173843],[119.317648,25.988715]
]
}]);
//對第一條線路（即索引 0）建立一個巡航器
var navg1 = pathSimplifierIns2.createPathNavigator(0, {
loop: true, //迴圈播放
speed: 1000000 //巡航速度，單位千米/小時
});
navg1.start();
});
</script>
</body>
</html>
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