3

我遇到了一些麻烦MapPolyline。如果缩小，它会以某种方式错误地渲染 gps 轨迹。

在较低的 mapControl.ZoomLevel（例如 9）下，仍然会绘制一些线/边缘，但它们不应该。这里有一些截图来演示奇怪的行为。

http://img403.imageshack.us/g/capture4jz.png/

图片描述：

  1. 第一张图片被缩小（ZoomLevel = 9）（注意蓝色的MapPolyline）
  2. 第二张图片放大一点（MapPolyline 还是一样的 -> 不正确）
  3. 第三张图像再次进一步放大（但 MapPolyline 看起来仍然非常相似）
  4. 最后一张图片：这是实际 gps 跟踪的样子。

因此，如果地图缩小，MapPolyline 会错误地绘制 gps 轨迹。似乎它在某个时候停止缩放并在较低的 ZoomLevels 下保持不变（9 - 15 == 缩小）

也许我做错了什么？有人可以告诉我如何解决这个问题吗？一些解决方法？

这是一个简单的测试应用程序来演示这种奇怪的行为（这种行为在设备和模拟器上是相同的）：

主页.xaml

    <!--ContentPanel - place additional content here-->
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0" >
        <my:Map x:Name="mapControl" Margin="8" CredentialsProvider="{Binding CredentialsProvider}">
            <my:MapLayer>
                <my:MapPolyline x:Name="mapPolyline" 
                                Stroke="#FF2C76B7"
           Opacity="0.85"
        StrokeThickness="6" />
            </my:MapLayer>
        </my:Map>
        <Button Content="+" HorizontalAlignment="Left"  Height="86" VerticalAlignment="Bottom" Margin="108,0,0,51" Width="95" Name="zoomInButton"  Click="zoomInButton_Click" />
        <Button Content="-" HorizontalAlignment="Right" Height="86" VerticalAlignment="Bottom" Margin="0,0,101,51" Width="98" Name="zoomOutButton" Click="zoomOutButton_Click" />
    </Grid>

MainPage.xaml.cs

    // Constructor
    public MainPage()
    {
        InitializeComponent();

        this.DataContext = this;

        // load an actual trace
        var loadedTrace = LoadCarDrive();

        var locations = new LocationCollection();
        foreach (var item in loadedTrace)
        {
            locations.Add(item.Location);
        }

        mapPolyline.Locations = locations;

        // zoom to center
        mapControl.SetView(LocationRect.CreateLocationRect(locations));
        mapControl.ZoomLevel = 9;
    }

    private void zoomInButton_Click(object sender, RoutedEventArgs e)
    {
        mapControl.ZoomLevel += 1;
        Debug.WriteLine(mapControl.ZoomLevel);
    }

    private void zoomOutButton_Click(object sender, RoutedEventArgs e)
    {
        mapControl.ZoomLevel -= 1;
        Debug.WriteLine(mapControl.ZoomLevel);
    }

    #region Car Drive Trace
    public List<GeoPosition<GeoCoordinate>> LoadCarDrive()
    {
        return new List<GeoPosition<GeoCoordinate>>() {
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405647110000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24879119, 14.30983157, 264.5, 7, 8, 0, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405667080000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24881212, 14.30975438, 266.25, 9, 8, 3.08515646975006, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405686990000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2488539, 14.30977517, 264.450002034505, 9, 8, 2.7708502915673, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405707010000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24888582, 14.30973458, 264.833329942491, 7, 6, 2.622272942855, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405727010000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24890673, 14.30970928, 264.027773256655, 7, 6, 2.09121417243467, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405747020000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2489299, 14.30967342, 263.053696997372, 7, 6, 1.89013767966395, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405767030000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24893927, 14.30963082, 262.293819348999, 7, 6, 1.66950420129036, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405787040000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2489513, 14.30961666, 260.815840816629, 7, 6, 1.45526477188896, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405807090000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897547, 14.30958534, 260.136549319532, 7, 6, 1.42904734840548, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405827120000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2490056, 14.30956493, 259.084125976376, 7, 4, 1.48926924922331, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405847120000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24901793, 14.30954465, 258.240225098636, 7, 4, 1.8838781127322, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405927280000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24901616, 14.30950247, 257.208112955994, 7, 6, 1.42209719840891, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405947300000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24902166, 14.30943419, 256.616110650371, 9, 6, 1.37894394353935, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405967320000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24902592, 14.30939502, 256.30807656996, 12, 6, 1.19195039763596, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315405987320000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24906708, 14.30934571, 256.508064441282, 7, 6, 2.04223380763222, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406007340000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24907986, 14.30932245, 256.405378302576, 7, 6, 2.21050803017023, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406027360000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24908171, 14.30927428, 256.371151650296, 9, 6, 2.11644554209566, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406067370000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24906849, 14.30929253, 256.325514053301, 7, 6, 1.30317650495332, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406107390000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24908503, 14.3092208, 255.065555234533, 9, 8, 1.03139622772203, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406147410000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24912105, 14.30913114, 253.697027164955, 17, 12, 1.28256512364723, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406167450000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24913691, 14.30915501, 253.087527466496, 17, 12, 1.48256704150828, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406207450000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24910669, 14.30913564, 252.394849509312, 26, 12, 1.45368860226716, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406227460000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24905554, 14.30905891, 252.427454922925, 14, 12, 1.70982854209585, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406247480000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24904891, 14.30902087, 252.407432776241, 14, 12, 2.32817436513961, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406267490000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24903438, 14.30895531, 252.511633302066, 9, 8, 2.40899029224891, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406307520000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2490193, 14.30891254, 254.10635332493, 9, 8, 1.92159113286849, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406327520000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24899752, 14.30886584, 255.33932684116, 9, 8, 1.38514001477141, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406347530000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24899835, 14.30883893, 256.148560055363, 12, 8, 1.2548486272039, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406387570000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24895525, 14.30878854, 257.595958229831, 9, 6, 1.33167435077218, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406407570000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24894308, 14.30881919, 257.748172761731, 7, 6, 1.3437967879493, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406427590000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24894424, 14.30879602, 258.148045698359, 7, 6, 1.40506752120999, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406447590000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897013, 14.3087708, 258.73206875102, 7, 6, 1.32722909233662, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406507630000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24899411, 14.30871161, 258.393367414116, 7, 6, 1.19050981731556, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406527630000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24900568, 14.30880985, 259.441816124056, 7, 6, 1.60071978622932, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406587660000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24901868, 14.30875422, 258.645063213896, 7, 6, 1.42179922641885, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406607680000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2490225, 14.3087142, 258.128955710307, 9, 8, 1.6648361142989, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406627690000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24899202, 14.30876327, 258.258006308068, 7, 6, 1.63091850786356, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406647700000, TimeSpan.FromHours(1)), new GeoCoordinate(48.248999, 14.30873814, 256.795654006125, 7, 6, 1.69687386722371, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406747760000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24898286, 14.30874518, 254.117882702387, 7, 6, 1.19924244305006, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406787770000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24900199, 14.30874282, 252.40450816716, 7, 8, 0, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406807800000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24901148, 14.30871393, 250.174130289849, 7, 12, 0.562022727939566, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406847810000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24902338, 14.30869189, 247.292875416659, 12, 12, 0.674589842740374, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406867820000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24902707, 14.30871843, 246.122333200998, 9, 12, 0.873256080158558, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406907840000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2490188, 14.30875003, 245.538406941563, 9, 12, 0.82098105319536, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406967870000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24903988, 14.30876066, 246.520244679682, 14, 12, 0.75138387232891, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315406987880000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24901843, 14.30869998, 247.552885908253, 14, 12, 1.28196277976357, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407007890000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24901495, 14.30869837, 247.82437482814, 12, 12, 1.07140934525889, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407067930000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24893342, 14.30866289, 245.792420245464, 9, 8, 1.48298498088654, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407087940000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24894735, 14.30866824, 243.872265024535, 9, 8, 0.870070550784878, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407107950000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24895537, 14.3086449, 241.021559722161, 9, 12, 1.11347094540375, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407147970000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24895027, 14.30862412, 238.031278984576, 12, 8, 0.773571842819805, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407167980000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24894213, 14.30857577, 235.850946235579, 14, 12, 1.12116766217648, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407188000000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24895591, 14.30851958, 233.260739705546, 19, 12, 1.27163333307808, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407208000000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24895305, 14.30858254, 230.737230681547, 12, 8, 1.90409780733048, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407228010000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24896214, 14.3085505, 228.832656795698, 14, 8, 1.72105403937988, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407248030000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24891651, 14.30852579, 227.723297860253, 12, 12, 2.15635087285783, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407268030000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24888497, 14.30851276, 226.018651551984, 14, 12, 1.91486801065635, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407308050000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24889868, 14.3084777, 224.780651838584, 17, 12, 1.7239841715139, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407328060000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2489161, 14.3084672, 223.699763727846, 19, 12, 1.19438627085672, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407348070000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24892424, 14.30845455, 222.860140556649, 14, 8, 0.846422498991796, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407388110000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897215, 14.30844792, 223.319966060326, 14, 8, 1.20716161411786, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407428130000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897508, 14.30842744, 224.160031469981, 19, 12, 0.932657766636434, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407448150000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24899233, 14.30847249, 225.093328441092, 14, 12, 1.13484005811991, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407488210000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2489731, 14.30852733, 226.251119970358, 14, 12, 1.0108183931221, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407508180000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24895873, 14.3085864, 226.881478734806, 12, 8, 1.4631129974199, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407528190000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897776, 14.30857073, 227.710866235055, 12, 8, 1.83969601940619, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407548210000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24895268, 14.30856623, 228.097452392297, 14, 8, 1.80248844193688, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407568210000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24899134, 14.30857573, 228.902770841279, 9, 8, 1.87871250563877, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407588220000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24896963, 14.30857888, 229.666741077859, 12, 8, 1.57348661211614, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407608230000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897652, 14.30861496, 230.789833237369, 14, 8, 1.44588983852298, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407648250000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24896462, 14.30855057, 232.685526806248, 12, 12, 1.62641254715026, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407668260000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897762, 14.30855976, 233.658453347872, 14, 12, 1.30362718600298, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407708280000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897772, 14.30853848, 235.647995419212, 7, 8, 1.09568972753188, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315407908300000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24897772, 14.30853848, 235.647995419212, 7, 8, 0, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412290810000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24900281, 14.30853533, 238.398661578303, 7, 6, 0, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412330830000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24916174, 14.30887975, 240.382221033677, 9, 8, 2.0845116247323, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412370850000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24932241, 14.30944236, 242.993631606337, 9, 8, 5.21982023106023, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412390860000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24939839, 14.30973055, 244.458617546671, 7, 6, 8.64711029733088, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412410870000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24949181, 14.31003057, 246.884087120013, 7, 8, 10.8538398691813, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412430880000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24959673, 14.31033509, 248.180905624572, 9, 8, 11.8312, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412450890000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24965238, 14.31066123, 249.088334983872, 7, 8, 12.6028, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412470900000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24978463, 14.3109267, 249.723078168309, 9, 8, 12.5685068628947, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412490910000, TimeSpan.FromHours(1)), new GeoCoordinate(48.24994331, 14.3111727, 249.970473085232, 9, 8, 12.4484800654093, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412510920000, TimeSpan.FromHours(1)), new GeoCoordinate(48.25010288, 14.3112952, 249.897850417847, 9, 6, 11.608293464152, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412550940000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2504877, 14.31153935, 251.089439133188, 7, 6, 10.8881333333333, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412570950000, TimeSpan.FromHours(1)), new GeoCoordinate(48.25063711, 14.31161383, 251.629094482507, 7, 6, 9.91077352956136, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412590960000, TimeSpan.FromHours(1)), new GeoCoordinate(48.25077697, 14.31164086, 251.939513239737, 9, 8, 9.08773349685669, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412610970000, TimeSpan.FromHours(1)), new GeoCoordinate(48.25089215, 14.31165132, 251.956198505071, 12, 8, 7.79596221612368, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412630980000, TimeSpan.FromHours(1)), new GeoCoordinate(48.25094566, 14.31162197, 252.531907983946, 7, 6, 5.73086814976673, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412650990000, TimeSpan.FromHours(1)), new GeoCoordinate(48.25097386, 14.31163463, 252.696037530844, 7, 6, 3.77117962934291, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412671000000, TimeSpan.FromHours(1)), new GeoCoordinate(48.2510034, 14.31162491, 253.075981838263, 9, 6, 2.64702266191533, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412691010000, TimeSpan.FromHours(1)), new GeoCoordinate(48.25102581, 14.31159456, 252.590673123036, 9, 6, 1.97770819383125, 0)),
         new GeoPosition<GeoCoordinate>(new DateTimeOffset(634315412731030000, TimeSpan.FromHours(1)), new GeoCoordinate(48.25103794, 14.31161438, 252.78888905611, 9, 6, 1.61398873787711, 0)),
     };
    }
    #endregion
4

2 回答 2

3

我不认为你做错了什么，问题是（我相信）在一个小附近有大量数据。这意味着许多具有相当高的 StrokeThickness 的锐角都融合成一个斑点。

一种使这更令人赏心悦目的解决方法是根据缩放级别更改 StrokeThickness（越缩小，StrokeThickness 越低），如下所示：

private void mapControl_ViewChangeEnd(object sender, MapEventArgs e)
    {
        if (mapControl.ZoomLevel > 17)
            mapPolyline.StrokeThickness = 6.00;
        else
            mapPolyline.StrokeThickness = 2.00;
    }

我确实相信这是需要研究的东西。

于 2011-01-26T10:36:55.373 回答
1

实际上，我宁愿认为问题不在于微软，而在于工具使用不当。在缩小数据时细化数据是正常的专业做法。例如，我公司的基于网络的车队跟踪产品可以显示车辆的行为。

对于 48 小时的旅程，如果您缩小到国家级别，您将看到大约一万个位置样本。发送给客户端的数据量非常可笑，尤其是因为这些点会相互模糊十到一个像素。

所以我们用一个接近阈值来对它们进行聚类，这个阈值是地图比例的函数。这使我们在合理的数字上相距大约十个像素，并消除了额外的噪声。请记住使用时间和空间上的接近度进行聚类，否则您可能会在往返路线中得到不适当的分组。

于 2011-05-15T11:29:09.173 回答