merge pr

modules/themes/index.scss

   display: block;
 }
 
-.cesium-viewer {
+.dc-viewer {
   font-family: sans-serif;
   font-size: 16px;
   overflow: hidden;
   height: 100%;
 }
 
-.cesium-viewer-widget-container {
+.dc-viewer-widget-container {
   width: 100%;
   height: 100%;
 }
 
-.cesium-widget {
+.dc-widget {
   font-family: sans-serif;
   font-size: 16px;
   overflow: hidden;
   height: 100%;
 }
 
-.cesium-widget,
-.cesium-widget canvas {
+.dc-widget,
+.dc-widget canvas {
   width: 100%;
   height: 100%;
   touch-action: none;
 }
 
-
 .div-icon {
   user-select: none;
   background-color: #fff;

modules/transform/CoordTransform.js

     if (this.out_of_china(lng, lat)) {
       return [lng, lat]
     } else {
-      let d = this.delta(lng, lat)
-      let mgLng = lng + d[0]
-      let mgLat = lat + d[1]
-      return [lng * 2 - mgLng, lat * 2 - mgLat]
+      let out = [lng, lat]
+
+      let gcj02_point = this.WGS84ToGCJ02(lng, lat)
+      let dlng = gcj02_point[0] - lng
+      let dlat = gcj02_point[1] - lat
+      do {
+        gcj02_point = this.WGS84ToGCJ02((out[0] -= dlng), (out[1] -= dlat))
+        dlng = gcj02_point[0] - lng
+        dlat = gcj02_point[1] - lat
+      } while (Math.abs(dlng) > 1e-7 || Math.abs(dlat) > 1e-7)
+
+      return out
     }
   }