Detailed explanation of the implementation of WeChat applet track playback and the pitfalls encountered

Detailed explanation of the implementation of WeChat applet track playback and the pitfalls encountered

WeChat applet trajectory playback mainly uses polyline for line drawing operations and markers for car movement operations. The effect diagram is as follows:

Specific implementation code:

trackplay.wxml file

<!--pages/tracker/tracker.wxml-->
<map id="mymap" longitude="{{mapCenter.longitude}}" latitude="{{mapCenter.latitude}}" scale="{{scale}}" markers="{{markers}}" polyline="{{polylineSettings}}" include-points="polygons" setting="{{mapSettings}}" bindregionchange="updatedMap" max-scale="16">
  <cover-view>{{showMessage}}</cover-view>
  <cover-view class="trackerImage" bindtap="trackerSetting">
    <cover-image class="lazy" data-src="{{imageSrc}}"></cover-image>
  </cover-view>
  <!--cover-view class="trackerQuick" bindtap="trackerQuickPlay">
    <cover-image style="line-height:1;" src="{{imageSpeedAdd}}"></cover-image>
  </cover-view>
  <cover-view class="trackerSlow" bindtap="trackerSlowPlay">
    <cover-image src="{{imageSpeedSlow}}"></cover-image>
  </cover-view-->
  <cover-view class="trackerPause" bindtap="trackerPause">
    <cover-image src="{{imagePause}}"></cover-image>
  </cover-view>
  <cover-view class="trackerPlay" bindtap="trackerPlay">
    <cover-image src="{{imagePlay}}"></cover-image>
  </cover-view>
</map>

trackplay.js file

const app = getApp();
Page({

 /**
  * Initial data of the page */
 data: {
  mapCtx: null,
  scale: 14,
  imageSrc: '/images/tracker/tracker-search.png',
  imageSpeedAdd: '/images/tracker/speed-add.png',
  imageSpeedSlow: '/images/tracker/speed-slow.png',
  imagePause: '/images/tracker/pause.png',
  imagePlay: '/images/tracker/play.png',
  mapCenter: {
   longitude: 113.324520,
   latitude: 23.099994
  },
  markers: [{ //The marker point is used to display the location of the marker on the map iconPath: "/images/tracker/car.png",
   id: 1,
   width: 25,
   height: 40,
   longitude: 113.324520,
   latitude: 23.099994,
   rotate: 0, //The default rotation angle is 0
   anchor:
    x: .5,
    y: .5
   }, //The latitude and longitude are at the anchor point of the annotation icon, the default bottom edge midpoint {x: .5, y: 1}
   callout: { //Bubble window above the mark point content: 'Track playback',
    color: '#fff',
    fontSize: 16,
    borderRadius: 3,
    borderWidth: 1,
    borderColor: '#07c160',
    bgColor: '#fff',
    padding: 5,
    textAlign: 'center',
    display: 'BYCLICK'
   },
  }],
  polylineSettings: [{ //路线points: [{latitude: 22.596206, longitude: 113.87317, gpsBearing: 244},{latitude: 22.596216, longitude: 113.873192, gpsBearing: 244},{latitude: 22.596213, longitude: 113.873177, gpsBearing: 244},{latitude: 22.596212, longitude: 113.873205, gpsBearing: 244},{latitude: 22.596155, longitude: 113.873147, gpsBearing: 244},{latitude: 22.59614, longitude: 113.87315, gpsBearing: 244},{latitude: 22.596122, longitude: 113.873146, gpsBearing: 244},{latitude: 22.596098, longitude: 113.873101, gpsBearing: 244},{latitude: 22.596123, longitude: 113.873095, gpsBearing: 244},{latitude: 22.59613, longitude: 113.873047, gpsBearing: 244},{latitude: 22.596154, longitude: 113.873006, gpsBearing: 244},{latitude: 22.596142, longitude: 113.873006, gpsBearing: 244},{latitude: 22.596131, longitude: 113.873009, gpsBearing: 244},{latitude: 22.596117, longitude: 113.873011, gpsBearing: 244},{latitude: 22.596112, longitude: 113.873014, gpsBearing: 244},{latitude: 22.596114, longitude: 113.873021, gpsBearing: 244},{latitude: 22.596122, longitude: 113.873029, gpsBearing: 244},{latitude: 22.596131, longitude: 113.873039, gpsBearing: 244},{latitude: 22.596127, longitude: 113.873046, gpsBearing: 244},{latitude: 22.596116, longitude: 113.873053, gpsBearing: 244},{latitude: 22.596097, longitude: 113.873055, gpsBearing: 244},{latitude: 22.596084, longitude: 113.87306, gpsBearing: 244},{latitude: 22.596074, longitude: 113.873069, gpsBearing: 244},{latitude: 22.596062, longitude: 113.873076, gpsBearing: 244},{latitude: 22.596046, longitude: 113.873075, gpsBearing: 244},{latitude: 22.596028, longitude: 113.873072, gpsBearing: 244},{latitude: 22.595997, longitude: 113.873047, gpsBearing: 244},{latitude: 22.595982, longitude: 113.873054, gpsBearing: 244},{latitude: 22.595967, longitude: 113.873067, gpsBearing: 244},{latitude: 22.595971, longitude: 113.873058, gpsBearing: 244},{latitude: 22.595975, longitude: 113.873046, gpsBearing: 244},{latitude: 22.595984, longitude: 113.873035, gpsBearing: 244},{latitude: 22.595992, longitude: 113.87303, gpsBearing: 244},{latitude: 22.59602, longitude: 113.87305, gpsBearing: 244},{latitude: 22.596017, longitude: 113.873057, gpsBearing: 244},{latitude: 22.596017, longitude: 113.873056, gpsBearing: 244},{latitude: 22.596011, longitude: 113.87305, gpsBearing: 244},{latitude: 22.596008, longitude: 113.873049, gpsBearing: 244},{latitude: 22.596006, longitude: 113.87305, gpsBearing: 244},{latitude: 22.596004, longitude: 113.873053, gpsBearing: 244},{latitude: 22.596004, longitude: 113.873054, gpsBearing: 244},{latitude: 22.595989, longitude: 113.873044, gpsBearing: 244},{latitude: 22.595996, longitude: 113.873051, gpsBearing: 244},{latitude: 22.596023, longitude: 113.873084, gpsBearing: 244},{latitude: 22.596033, longitude: 113.873076, gpsBearing: 244},{latitude: 22.59604, longitude: 113.873076, gpsBearing: 244},{latitude: 22.596041, longitude: 113.873077, gpsBearing: 244},{latitude: 22.596035, longitude: 113.87308, gpsBearing: 244},{latitude: 22.596023, longitude: 113.873069, gpsBearing: 244},{latitude: 22.59602, longitude: 113.873076, gpsBearing: 244},{latitude: 22.596019, longitude: 113.873085, gpsBearing: 244},{latitude: 22.596027, longitude: 113.873101, gpsBearing: 244},{latitude: 22.596018, longitude: 113.873105, gpsBearing: 244},{latitude: 22.596012, longitude: 113.873108, gpsBearing: 244},{latitude: 22.596008, longitude: 113.873111, gpsBearing: 244},{latitude: 22.596009, longitude: 113.873119, gpsBearing: 244},{latitude: 22.59601, longitude: 113.873126, gpsBearing: 244},{latitude: 22.596015, longitude: 113.873135, gpsBearing: 244},{latitude: 22.596017, longitude: 113.873143, gpsBearing: 244},{latitude: 22.596017, longitude: 113.873152, gpsBearing: 244},{latitude: 22.595972, longitude: 113.873132, gpsBearing: 244},{latitude: 22.595979, longitude: 113.873145, gpsBearing: 244},{latitude: 22.595982, longitude: 113.873143, gpsBearing: 244},{latitude: 22.595988, longitude: 113.873132, gpsBearing: 244},{latitude: 22.595988, longitude: 113.873128, gpsBearing: 244},{latitude: 22.59599, longitude: 113.873135, gpsBearing: 244},{latitude: 22.595992, longitude: 113.87314, gpsBearing: 244},{latitude: 22.596003, longitude: 113.873144, gpsBearing: 244},{latitude: 22.596007, longitude: 113.873157, gpsBearing: 244},{latitude: 22.596009, longitude: 113.873165, gpsBearing: 244},{latitude: 22.59602, longitude: 113.873171, gpsBearing: 244},{latitude: 22.596035, longitude: 113.873175, gpsBearing: 244},{latitude: 22.596044, longitude: 113.873179, gpsBearing: 244},{latitude: 22.596049, longitude: 113.873176, gpsBearing: 244},{latitude: 22.59605, longitude: 113.873174, gpsBearing: 244},{latitude: 22.596049, longitude: 113.873177, gpsBearing: 244},{latitude: 22.596048, longitude: 113.87318, gpsBearing: 244},{latitude: 22.596049, longitude: 113.873186, gpsBearing: 244},{latitude: 22.596052, longitude: 113.873188, gpsBearing: 244},{latitude: 22.596053, longitude: 113.873192, gpsBearing: 244},{latitude: 22.596049, longitude: 113.873199, gpsBearing: 244},{latitude: 22.59605, longitude: 113.873199, gpsBearing: 244},{latitude: 22.596054, longitude: 113.873201, gpsBearing: 244},{latitude: 22.596061, longitude: 113.873211, gpsBearing: 244},{latitude: 22.596063, longitude: 113.873215, gpsBearing: 244},{latitude: 22.596064, longitude: 113.87322, gpsBearing: 244},{latitude: 22.59607, longitude: 113.873222, gpsBearing: 244},{latitude: 22.596067, longitude: 113.873219, gpsBearing: 244},{latitude: 22.596063, longitude: 113.873215, gpsBearing: 244},{latitude: 22.59606, longitude: 113.873219, gpsBearing: 244},{latitude: 22.596061, longitude: 113.873213, gpsBearing: 244},{latitude: 22.595382, longitude: 113.873102, gpsBearing: 0},{latitude: 22.595395, longitude: 113.873132, gpsBearing: 0},{latitude: 22.595371, longitude: 113.873124, gpsBearing: 0},{latitude: 22.595353, longitude: 113.873115, gpsBearing: 0},{latitude: 22.595278, longitude: 113.873133, gpsBearing: 0},{latitude: 22.595199, longitude: 113.873142, gpsBearing: 0},{latitude: 22.594997, longitude: 113.87324, gpsBearing: 91},{latitude: 22.595042, longitude: 113.873372, gpsBearing: 157},{latitude: 22.595165, longitude: 113.873482, gpsBearing: 14},{latitude: 22.595167, longitude: 113.873615, gpsBearing: 264},{latitude: 22.595127, longitude: 113.873673, gpsBearing: 229},{latitude: 22.595109, longitude: 113.873692, gpsBearing: 229},{latitude: 22.595107, longitude: 113.873709, gpsBearing: 229},{latitude: 22.595105, longitude: 113.873715, gpsBearing: 229},{latitude: 22.595092, longitude: 113.873767, gpsBearing: 229},{latitude: 22.595017, longitude: 113.873925, gpsBearing: 113},{latitude: 22.594878, longitude: 113.873748, gpsBearing: 242},{latitude: 22.594688, longitude: 113.873477, gpsBearing: 223},{latitude: 22.594547, longitude: 113.873267, gpsBearing: 243},{latitude: 22.594415, longitude: 113.873053, gpsBearing: 228},{latitude: 22.594323, longitude: 113.872878, gpsBearing: 239},{latitude: 22.594276, longitude: 113.872889, gpsBearing: 242},{latitude: 22.594277, longitude: 113.872878, gpsBearing: 242},{latitude: 22.594272, longitude: 113.872867, gpsBearing: 242},{latitude: 22.594252, longitude: 113.872834, gpsBearing: 242},{latitude: 22.594366, longitude: 113.872594, gpsBearing: 321},{latitude: 22.594751, longitude: 113.872271, gpsBearing: 330},{latitude: 22.595176, longitude: 113.871885, gpsBearing: 327},{latitude: 22.595756, longitude: 113.87141, gpsBearing: 326},{latitude: 22.59617, longitude: 113.870976, gpsBearing: 293},{latitude: 22.595982, longitude: 113.870511, gpsBearing: 228},{latitude: 22.595925, longitude: 113.870396, gpsBearing: 231},{latitude: 22.595922, longitude: 113.870391, gpsBearing: 231},{latitude: 22.595921, longitude: 113.870391, gpsBearing: 231},{latitude: 22.595879, longitude: 113.870283, gpsBearing: 251},{latitude: 22.59587, longitude: 113.870271, gpsBearing: 255},{latitude: 22.59585, longitude: 113.870248, gpsBearing: 255},{latitude: 22.595844, longitude: 113.870242, gpsBearing: 255},{latitude: 22.595838, longitude: 113.870234, gpsBearing: 255},{latitude: 22.595833, longitude: 113.870228, gpsBearing: 255},{latitude: 22.595801, longitude: 113.870155, gpsBearing: 255},{latitude: 22.595781, longitude: 113.870103, gpsBearing: 257},{latitude: 22.59577, longitude: 113.870088, gpsBearing: 257},{latitude: 22.595768, longitude: 113.870055, gpsBearing: 257},{latitude: 22.595792, longitude: 113.870001, gpsBearing: 257},{latitude: 22.595883, longitude: 113.869913, gpsBearing: 311},{latitude: 22.596241, longitude: 113.869685, gpsBearing: 340},{latitude: 22.597061, longitude: 113.86915, gpsBearing: 327},{latitude: 22.597764, longitude: 113.868657, gpsBearing: 327},{latitude: 22.598526, longitude: 113.868166, gpsBearing: 330},{latitude: 22.599516, longitude: 113.867496, gpsBearing: 326},{latitude: 22.600336, longitude: 113.866976, gpsBearing: 328},{latitude: 22.601014, longitude: 113.866459, gpsBearing: 325},{latitude: 22.601759, longitude: 113.865882, gpsBearing: 319},{latitude: 22.602108, longitude: 113.865617, gpsBearing: 327},{latitude: 22.602445, longitude: 113.865335, gpsBearing: 322},{latitude: 22.604112, longitude: 113.863745, gpsBearing: 318},{latitude: 22.60445, longitude: 113.863392, gpsBearing: 314},{latitude: 22.604655, longitude: 113.863191, gpsBearing: 317},{latitude: 22.604844, longitude: 113.862974, gpsBearing: 326},{latitude: 22.606299, longitude: 113.861679, gpsBearing: 322},{latitude: 22.60691, longitude: 113.861282, gpsBearing: 332},{latitude: 22.607577, longitude: 113.860947, gpsBearing: 336},{latitude: 22.608198, longitude: 113.860659, gpsBearing: 338},{latitude: 22.608535, longitude: 113.860509, gpsBearing: 344},{latitude: 22.608922, longitude: 113.860322, gpsBearing: 332},{latitude: 22.609435, longitude: 113.860072, gpsBearing: 338},{latitude: 22.61004, longitude: 113.859761, gpsBearing: 334},{latitude: 22.610392, longitude: 113.859548, gpsBearing: 335},{latitude: 22.61047, longitude: 113.859458, gpsBearing: 338},{latitude: 22.610558, longitude: 113.859366, gpsBearing: 338},{latitude: 22.610873, longitude: 113.85919, gpsBearing: 333},{latitude: 22.611081, longitude: 113.859092, gpsBearing: 331},{latitude: 22.611356, longitude: 113.858966, gpsBearing: 340},{latitude: 22.611655, longitude: 113.858828, gpsBearing: 333},{latitude: 22.612054, longitude: 113.858623, gpsBearing: 334},{latitude: 22.612305, longitude: 113.858503, gpsBearing: 335},{latitude: 22.612555, longitude: 113.858369, gpsBearing: 335},{latitude: 22.612731, longitude: 113.858277, gpsBearing: 334},{latitude: 22.613101, longitude: 113.858116, gpsBearing: 343},{latitude: 22.613474, longitude: 113.85796, gpsBearing: 341},{latitude: 22.614135, longitude: 113.857541, gpsBearing: 328},{latitude: 22.615013, longitude: 113.856929, gpsBearing: 326},{latitude: 22.616048, longitude: 113.85613, gpsBearing: 322},{latitude: 22.617079, longitude: 113.855296, gpsBearing: 319},{latitude: 22.61802, longitude: 113.854498, gpsBearing: 321},{latitude: 22.618689, longitude: 113.853904, gpsBearing: 321},{latitude: 22.619046, longitude: 113.85358, gpsBearing: 318},{latitude: 22.619278, longitude: 113.853376, gpsBearing: 316},{latitude: 22.619668, longitude: 113.853046, gpsBearing: 329},{latitude: 22.620248, longitude: 113.852555, gpsBearing: 320},{latitude: 22.62042, longitude: 113.85239, gpsBearing: 321},{latitude: 22.62085, longitude: 113.852022, gpsBearing: 321},{latitude: 22.621188, longitude: 113.851787, gpsBearing: 337},{latitude: 22.62167, longitude: 113.851444, gpsBearing: 326},{latitude: 22.622059, longitude: 113.851191, gpsBearing: 331},{latitude: 22.622527, longitude: 113.850892, gpsBearing: 330},{latitude: 22.622824, longitude: 113.850735, gpsBearing: 340},{latitude: 22.623182, longitude: 113.850531, gpsBearing: 332},{latitude: 22.623666, longitude: 113.850243, gpsBearing: 333},{latitude: 22.624357, longitude: 113.84992, gpsBearing: 337},{latitude: 22.624972, longitude: 113.849677, gpsBearing: 342},{latitude: 22.625648, longitude: 113.849314, gpsBearing: 327},{latitude: 22.626399, longitude: 113.848871, gpsBearing: 332},{latitude: 22.626952, longitude: 113.848533, gpsBearing: 328},{latitude: 22.627567, longitude: 113.848077, gpsBearing: 324},{latitude: 22.628267, longitude: 113.847538, gpsBearing: 325},{latitude: 22.62907, longitude: 113.846803, gpsBearing: 320},{latitude: 22.629844, longitude: 113.846088, gpsBearing: 319},{latitude: 22.630508, longitude: 113.845474, gpsBearing: 320},{latitude: 22.631219, longitude: 113.844839, gpsBearing: 320},{latitude: 22.631904, longitude: 113.844202, gpsBearing: 317},{latitude: 22.6326, longitude: 113.843615, gpsBearing: 323},{latitude: 22.63327, longitude: 113.84305, gpsBearing: 319},{latitude: 22.63395, longitude: 113.84246, gpsBearing: 321},{latitude: 22.634749, longitude: 113.841687, gpsBearing: 314},{latitude: 22.635693, longitude: 113.840785, gpsBearing: 318},{latitude: 22.636531, longitude: 113.839701, gpsBearing: 302},{latitude: 22.637421, longitude: 113.838755, gpsBearing: 320},{latitude: 22.638429, longitude: 113.837917, gpsBearing: 318},{latitude: 22.639228, longitude: 113.837153, gpsBearing: 318},{latitude: 22.639727, longitude: 113.836756, gpsBearing: 325},{latitude: 22.640429, longitude: 113.836294, gpsBearing: 330},{latitude: 22.640876, longitude: 113.836018, gpsBearing: 332},{latitude: 22.641161, longitude: 113.835815, gpsBearing: 324},{latitude: 22.641617, longitude: 113.835526, gpsBearing: 334},{latitude: 22.642177, longitude: 113.835227, gpsBearing: 331},{latitude: 22.642515, longitude: 113.834992, gpsBearing: 320},{latitude: 22.643021, longitude: 113.834658, gpsBearing: 329},{latitude: 22.643557, longitude: 113.834292, gpsBearing: 328},{latitude: 22.644073, longitude: 113.833943, gpsBearing: 327},{latitude: 22.644542, longitude: 113.833564, gpsBearing: 319},{latitude: 22.645273, longitude: 113.832871, gpsBearing: 319},{latitude: 22.64629, longitude: 113.832075, gpsBearing: 321},{latitude: 22.647176, longitude: 113.831203, gpsBearing: 315},{latitude: 22.648153, longitude: 113.830214, gpsBearing: 316},{latitude: 22.64912, longitude: 113.829231, gpsBearing: 316},{latitude: 22.649892, longitude: 113.828469, gpsBearing: 319},{latitude: 22.650929, longitude: 113.827758, gpsBearing: 334},{latitude: 22.652273, longitude: 113.82722, gpsBearing: 346},{latitude: 22.653721, longitude: 113.827043, gpsBearing: 0},{latitude: 22.65517, longitude: 113.827253, gpsBearing: 14},{latitude: 22.656599, longitude: 113.827553, gpsBearing: 11},{latitude: 22.658001, longitude: 113.827843, gpsBearing: 10},{latitude: 22.659265, longitude: 113.828104, gpsBearing: 10},{latitude: 22.660267, longitude: 113.828311, gpsBearing: 11},{latitude: 22.661353, longitude: 113.828523, gpsBearing: 10},{latitude: 22.662587, longitude: 113.828707, gpsBearing: 5},{latitude: 22.663792, longitude: 113.828852, gpsBearing: 9},{latitude: 22.664849, longitude: 113.828935, gpsBearing: 358},{latitude: 22.666112, longitude: 113.828927, gpsBearing: 0},{latitude: 22.66696, longitude: 113.828904, gpsBearing: 0},{latitude: 22.6682, longitude: 113.828904, gpsBearing: 1},{latitude: 22.669147, longitude: 113.828892, gpsBearing: 357},{latitude: 22.670029, longitude: 113.82891, gpsBearing: 1},{latitude: 22.670366, longitude: 113.829053, gpsBearing: 74},{latitude: 22.670421, longitude: 113.829364, gpsBearing: 90},{latitude: 22.670444, longitude: 113.829855, gpsBearing: 93},{latitude: 22.670461, longitude: 113.830243, gpsBearing: 77},{latitude: 22.670541, longitude: 113.830399, gpsBearing: 21},{latitude: 22.670909, longitude: 113.83034, gpsBearing: 349},{latitude: 22.671146, longitude: 113.830415, gpsBearing: 38},{latitude: 22.671149, longitude: 113.830554, gpsBearing: 143},{latitude: 22.671147, longitude: 113.830591, gpsBearing: 103},{latitude: 22.671211, longitude: 113.830701, gpsBearing: 59},{latitude: 22.671229, longitude: 113.830758, gpsBearing: 54},{latitude: 22.671152, longitude: 113.830826, gpsBearing: 141},{latitude: 22.671181, longitude: 113.830789, gpsBearing: 148},{latitude: 22.671081, longitude: 113.830807, gpsBearing: 173},{latitude: 22.671056, longitude: 113.830823, gpsBearing: 176},{latitude: 22.671067, longitude: 113.830761, gpsBearing: 197},{latitude: 22.671138, longitude: 113.830843, gpsBearing: 199},{latitude: 22.67108, longitude: 113.830825, gpsBearing: 204},{latitude: 22.671102, longitude: 113.830873, gpsBearing: 210},{latitude: 22.671024, longitude: 113.830966, gpsBearing: 200},{latitude: 22.670681, longitude: 113.830952, gpsBearing: 146},{latitude: 22.670178, longitude: 113.830837, gpsBearing: 182},{latitude: 22.671683, longitude: 113.830848, gpsBearing: 63},{latitude: 22.671662, longitude: 113.830848, gpsBearing: 63},{latitude: 22.671662, longitude: 113.830841, gpsBearing: 55},{latitude: 22.671555, longitude: 113.83088, gpsBearing: 20},{latitude: 22.671481, longitude: 113.830897, gpsBearing: 11},{latitude: 22.671486, longitude: 113.830877, gpsBearing: 11},{latitude: 22.671422, longitude: 113.830844, gpsBearing: 11},{latitude: 22.6714, longitude: 113.830852, gpsBearing: 11},{latitude: 22.671388, longitude: 113.830872, gpsBearing: 11},{latitude: 22.671458, longitude: 113.830874, gpsBearing: 11},{latitude: 22.671463, longitude: 113.830894, gpsBearing: 11},{latitude: 22.671475, longitude: 113.830892, gpsBearing: 11},{latitude: 22.671493, longitude: 113.830812, gpsBearing: 11},{latitude: 22.67146, longitude: 113.830784, gpsBearing: 11},{latitude: 22.671443, longitude: 113.830807, gpsBearing: 11},{latitude: 22.671389, longitude: 113.830789, gpsBearing: 11},{latitude: 22.671289, longitude: 113.830735, gpsBearing: 11},{latitude: 22.671227, longitude: 113.830663, gpsBearing: 11},{latitude: 22.671224, longitude: 113.830673, gpsBearing: 11},{latitude: 22.671251, longitude: 113.830766, gpsBearing: 11},{latitude: 22.671234, longitude: 113.830775, gpsBearing: 11},{latitude: 22.67121, longitude: 113.830679, gpsBearing: 11},{latitude: 22.67117, longitude: 113.83051, gpsBearing: 11},{latitude: 22.671142, longitude: 113.830573, gpsBearing: 11},{latitude: 22.670879, longitude: 113.830429, gpsBearing: 348},{latitude: 22.670907, longitude: 113.830445, gpsBearing: 260},{latitude: 22.670978, longitude: 113.830479, gpsBearing: 224},{latitude: 22.671004, longitude: 113.830568, gpsBearing: 224},{latitude: 22.670994, longitude: 113.830727, gpsBearing: 153},{latitude: 22.670997, longitude: 113.830757, gpsBearing: 161},{latitude: 22.671047, longitude: 113.830795, gpsBearing: 166},{latitude: 22.671073, longitude: 113.830817, gpsBearing: 169},{latitude: 22.671085, longitude: 113.830824, gpsBearing: 169},{latitude: 22.671058, longitude: 113.830814, gpsBearing: 169},{latitude: 22.671086, longitude: 113.830899, gpsBearing: 169},{latitude: 22.671089, longitude: 113.830965, gpsBearing: 169},{latitude: 22.671117, longitude: 113.830947, gpsBearing: 169},{latitude: 22.671631, longitude: 113.831154, gpsBearing: 158},{latitude: 22.6716, longitude: 113.831148, gpsBearing: 145},{latitude: 22.67152, longitude: 113.831287, gpsBearing: 145},{latitude: 22.671486, longitude: 113.831509, gpsBearing: 77},{latitude: 22.67135, longitude: 113.831558, gpsBearing: 96},{latitude: 22.671349, longitude: 113.831529, gpsBearing: 102},{latitude: 22.671346, longitude: 113.831489, gpsBearing: 95},{latitude: 22.671388, longitude: 113.831372, gpsBearing: 95},{latitude: 22.671386, longitude: 113.831333, gpsBearing: 95},{latitude: 22.671407, longitude: 113.831286, gpsBearing: 95},{latitude: 22.671292, longitude: 113.831228, gpsBearing: 95},{latitude: 22.671025, longitude: 113.831196, gpsBearing: 149},{latitude: 22.671026, longitude: 113.831183, gpsBearing: 180},{latitude: 22.671076, longitude: 113.83113, gpsBearing: 180},{latitude: 22.671119, longitude: 113.831024, gpsBearing: 180},{latitude: 22.67117, longitude: 113.830974, gpsBearing: 180},{latitude: 22.67112, longitude: 113.830935, gpsBearing: 180},{latitude: 22.671233, longitude: 113.830912, gpsBearing: 180},{latitude: 22.671269, longitude: 113.830879, gpsBearing: 180},{latitude: 22.671215, longitude: 113.830906, gpsBearing: 180},{latitude: 22.6712, longitude: 113.830907, gpsBearing: 180},{latitude: 22.671278, longitude: 113.830979, gpsBearing: 180},{latitude: 22.671498, longitude: 113.831101, gpsBearing: 180},{latitude: 22.671705, longitude: 113.831304, gpsBearing: 43},{latitude: 22.671713, longitude: 113.831276, gpsBearing: 297},{latitude: 22.67165, longitude: 113.831221, gpsBearing: 298},{latitude: 22.671617, longitude: 113.83117, gpsBearing: 312},{latitude: 22.671463, longitude: 113.831156, gpsBearing: 326},{latitude: 22.671413, longitude: 113.831106, gpsBearing: 339},{latitude: 22.671225, longitude: 113.831049, gpsBearing: 353},{latitude: 22.670929, longitude: 113.830936, gpsBearing: 99},{latitude: 22.670841, longitude: 113.83088, gpsBearing: 225},{latitude: 22.671066, longitude: 113.830904, gpsBearing: 231},{latitude: 22.671164, longitude: 113.830972, gpsBearing: 20},{latitude: 22.671189, longitude: 113.83107, gpsBearing: 22},{latitude: 22.671145, longitude: 113.831111, gpsBearing: 29},{latitude: 22.671133, longitude: 113.830951, gpsBearing: 34},{latitude: 22.671185, longitude: 113.830818, gpsBearing: 29},{latitude: 22.671209, longitude: 113.830802, gpsBearing: 348},{latitude: 22.671145, longitude: 113.830834, gpsBearing: 348},{latitude: 22.67109, longitude: 113.830825, gpsBearing: 348},{latitude: 22.671034, longitude: 113.830765, gpsBearing: 348},{latitude: 22.671065, longitude: 113.830838, gpsBearing: 348},{latitude: 22.671175, longitude: 113.830935, gpsBearing: 348},{latitude: 22.671178, longitude: 113.830935, gpsBearing: 348},{latitude: 22.671248, longitude: 113.830893, gpsBearing: 348},{latitude: 22.671134, longitude: 113.83089, gpsBearing: 348},{latitude: 22.671147, longitude: 113.830964, gpsBearing: 348},{latitude: 22.671283, longitude: 113.831064, gpsBearing: 348},{latitude: 22.671341, longitude: 113.831058, gpsBearing: 348}],
   color: "#7b7af8",
   width: 5,
   //borderWidth: 2,
   borderColor: '#7b7af8',
   level: 'abovebuildings', //Overlapping relationship arrowLine: true //Line with arrow}],
  polygons: [],
  mapSettings: { //Uniformly set map configuration skew: 0, //Tilt angle rotate: 0, //Rotation angle showScale: false, //Show scale, the tool does not support it yet subKey: '', //Key used for personalized maps
   layerStyle: 1, // Personalized map configuration style
   enableZoom: true, //Zoom enableScroll: true, //Drag enableRotate: false, //Rotate showCompass: false, //Compass enable3D: false, //Show 3D buildings (not supported by the tool yet)
   enableOverlooking: false, //Overlooking enableSatellite: false, //Satellite image enableTraffic: false, //Real-time traffic conditions},
  playIndex: 0,
  showMessage: "",
  step: 1,
  duration: 100,
  maxDuration: 2000,
  minDuration: 500,
  isPause: false
 },
 trackPlay: function () { //track interface const that = this;
  const points = this.data.polylineSettings[0].points;
  that.setData({
   'markers[0].latitude': points[0].latitude,
   'markers[0].longitude': points[0].longitude,
   mapCenter: points[0],
  }, function () {
   that.mapCtx.translateMarker({
    markerId: 1,
    autoRotate: true,
    moveWithRotate: true,
    duration: 1000,
    destination: points[0]
   })
   that.beginTrack() //Track playback})
 },
 beginTrack: function () { //Track playback const that = this;
  let index = that.data.playIndex === 0 ? 0 : that.data.playIndex;
  let points = this.data.polylineSettings[0].points;
  let duration = that.data.duration;

  //this.play();
  that.data.trackTimer = setInterval(function () {
   const point = points[index];
   that.data.lastPoint = point;
   //console.log("Last point:",that.data.lastPoint);
   // console.log(point,that.getCurrentTime());
   that.mapCtx.translateMarker({
    markerId: 1,
    autoRotate: false,
    moveWithRotate: true,
    duration: duration,
    destination: point,
    rotate: point.gpsBearing,
    fail: function (res) {
     console.log(res);
    },
    success: function () {
     that.setData({
      playIndex: index,
      showMessage: point.latitude + "," + point.longitude + "," + point.gpsBearing + "," + points.length + "," + index
     })
     that.mapCtx.getRegion({
      success: function (e) {
       if (that.checkOutRegion(point, e.southwest, e.northeast)) {
        that.setData({
         mapCenter: point,
        })
       }
      }
     });
     if (index + 1 >= points.length) {
      that.stopTrack()
     }
     index++;
    }
   })

  }, duration);
 },
 stopTrack: function () { //End playback const that = this;
  let points = this.data.polylineSettings[0].points;
  that.setData({
   playIndex: 0,
   'markers[0].latitude': points[0].latitude,
   'markers[0].longitude': points[0].longitude,
  });
  clearInterval(that.data.trackTimer);
 },
 checkOutRegion: function (point, southwest, northeast) {
  // console.log(point,southwest,northeast);
  if (point.longitude < southwest.longitude || point.latitude < southwest.latitude) {
   return true;
  }
  if (point.longitude > northeast.longitude || point.latitude > northeast.latitude) {
   return true;
  }
  return false;
 },
 trackerPause: function () {
  if (!this.data.isPause) {
   clearInterval(this.data.trackTimer);
   this.setData({
    isPause: true
   });
  }

 },
 trackerPlay: function () {
  if (this.data.isPause) {
   this.beginTrack();
   this.setData({
    isPause: false
   });
  }

 },
 /**
  * Life cycle function--listen for page loading*/
 onLoad: function (options) {
  this.mapCtx = wx.createMapContext('mymap');
  this.trackPlay();
 },
})

If you switch the center point of the map every time you move a point to follow the position of the vehicle, the map will feel jittery. Therefore, we made a judgment on the visualization area, and when the car leaves the visualization area, we will switch the center point of the map.

The translateMarker function is also used here to switch the car's deflection angle so that the car can switch smoothly. Please note that the default direction of the car image is upward, which is equivalent to the north direction.

Currently, the track playback function is implemented, and we will continue to add fast forward and fast rewind functions in the future.

During the implementation process, I encountered several small program bugs that cannot be solved for the time being. I will record them first and wait for WeChat to update:

1. The borderWidth setting in the trajectory drawing line causes the trajectory to be unable to be displayed on the real machine.

2. The track is invisible due to map level switching. For details, please refer to: https://developers.weixin.qq.com/community/develop/doc/000e8eed2fc20884237a791105b800

I haven't found a solution to the above two problems. If you have a solution, please send me a message to tell me

This concludes this article on the detailed explanation of the WeChat Mini Program track playback implementation and the pitfalls encountered. For more relevant Mini Program track playback content, please search for previous articles on 123WORDPRESS.COM or continue to browse the related articles below. I hope everyone will support 123WORDPRESS.COM in the future!

You may also be interested in:
  • Sample code for implementing track playback in WeChat applet

<<:  Analysis of the usage of replace and regexp for regular expression replacement in MySQL

>>:  How to solve the abnormal error ERROR: 2002 in mysql

Recommend

The MySql 8.0.16 version installation prompts that "UTF8B4" is used instead of "UTF8B3"

When installing in MySQL 8.0.16, some errors may ...

Div nested html without iframe

Recently, when doing homework, I needed to nest a ...

JavaScript Basics: Immediate Execution Function

Table of contents Immediately execute function fo...

How to modify port 3389 of Windows server 2008 R2 remote desktop

The default port number of the Windows server rem...

Using Docker Enterprise Edition to build your own private registry server

Docker is really cool, especially because it'...

Example code of how to implement pivot table in MySQL/MariaDB

The previous article introduced several methods f...

Compatibility issues when inserting audio files in HTML and playing them in browsers

Let's talk about some problems I have encounte...

An article teaches you to write clean JavaScript code

Table of contents 1. Variables Use meaningful nam...

Vue Element front-end application development conventional Element interface components

Table of contents 1. List interface and other mod...

A quick solution to the error #1929 Incorrect datetime value: '''' for column ''createtime'' when using MySQL 5.x or above

After I installed MySQL, when I tried to save and...

3 methods to restore table structure from frm file in mysql [recommended]

When mysql is running normally, it is not difficu...

Detailed explanation of moment.js time and date processing

Monday to Sunday time format conversion (Y --- ye...

mysql5.7.19 winx64 installation and configuration method graphic tutorial (win10)

The installation tutorial of mysql 5.7.19 winx64 ...

MySQL query syntax summary

Preface: This article mainly introduces the query...

Solution to MySQL remote connection failure

I have encountered the problem that MySQL can con...