Add gpx support

Apps/CesiumViewer/CesiumViewer.js

@@ -11,6 +11,7 @@ import {
   CzmlDataSource,
   GeoJsonDataSource,
   KmlDataSource,
+  GpxDataSource,
   TileMapServiceImageryProvider,
   Viewer,
   viewerCesiumInspectorMixin,
@@ -118,6 +119,8 @@ function main() {
         sourceType = "geojson";
       } else if (/\.kml$/i.test(source) || /\.kmz$/i.test(source)) {
         sourceType = "kml";
+      } else if (/\.gpx$/i.test(source) || /\.gpx$/i.test(source)) {
+        sourceType = "gpx";
       }
     }
 
@@ -132,6 +135,8 @@ function main() {
         canvas: scene.canvas,
         screenOverlayContainer: viewer.container,
       });
+    } else if (sourceType === "gpx") {
+      loadPromise = GpxDataSource.load(source);
     } else {
       showLoadError(source, "Unknown format.");
     }

Apps/SampleData/gpx/complexTrk.gpx

@@ -0,0 +1,219 @@
+<gpx creator="GPS Visualizer http://www.gpsvisualizer.com/" version="1.0">
+  <wpt lat="45.44283" lon="-121.72904"><ele>1374</ele><name>Vista Ridge Trailhead</name><sym>Trail Head</sym></wpt>
+  <wpt lat="45.41000" lon="-121.71349"><ele>1777</ele><name>Wy'East Basin</name></wpt>
+  <wpt lat="45.41124" lon="-121.70404"><ele>1823</ele><name>Dollar Lake</name></wpt>
+  <wpt lat="45.39260" lon="-121.69937"><ele>2394</ele><name>Barrett Spur</name><sym>Summit</sym></wpt>
+  <trk>
+    <name>Barrett Spur 1</name>
+    <trkseg>
+      <trkpt lat="45.4431641" lon="-121.7295456"></trkpt>
+      <trkpt lat="45.4428615" lon="-121.7290800"></trkpt>
+      <trkpt lat="45.4425697" lon="-121.7279085"></trkpt>
+      <trkpt lat="45.4424274" lon="-121.7267360"></trkpt>
+      <trkpt lat="45.4422017" lon="-121.7260429"></trkpt>
+      <trkpt lat="45.4416576" lon="-121.7252347"></trkpt>
+      <trkpt lat="45.4406144" lon="-121.7241181"></trkpt>
+      <trkpt lat="45.4398193" lon="-121.7224890"></trkpt>
+      <trkpt lat="45.4387649" lon="-121.7226112"></trkpt>
+      <trkpt lat="45.4383933" lon="-121.7224328"></trkpt>
+      <trkpt lat="45.4377850" lon="-121.7224159"></trkpt>
+      <trkpt lat="45.4372204" lon="-121.7226603"></trkpt>
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+      <trkpt lat="45.4238682" lon="-121.7219830"></trkpt>
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+      <trkpt lat="45.4099806" lon="-121.7134527"></trkpt>
+    </trkseg>
+    <trkseg>
+      <trkpt lat="45.4099792" lon="-121.7134610"></trkpt>
+      <trkpt lat="45.4091489" lon="-121.7134937"></trkpt>
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+      <trkpt lat="45.3928117" lon="-121.6995661"></trkpt>
+    </trkseg>
+  </trk>
+  <trk>
+    <name>Barrett Spur 2</name>
+    <trkseg>
+      <trkpt lat="45.3928201" lon="-121.6995658"></trkpt>
+      <trkpt lat="45.3935449" lon="-121.6998805"></trkpt>
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+    </trkseg>
+    <trkseg>
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+    <trkseg>
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+    </trkseg>
+  </trk>
+</gpx>