Merge pull request #154 from deviantony/master

Added support for minZoomOverride flag. If set to true, the minZoom o…

README.md

@@ -385,6 +385,21 @@ and if so, uses it, so it won't load a second copy of the library.
 <script type="text/javascript" src="https://maps.google.com/maps/api/js?libraries=places&sensor=false"></script>
 ```
 
+### Override the default minimum zoom
+
+*WARNING*: Setting these options can break markers calculation, causing no homeomorphism between screen coordinates and map.
+
+You can use the `minZoomOverride` associated with the `minZoom` in the custom map options to prevent a minimum zoom from being calculated:
+
+```javascript
+function createMapOptions() {
+  return {
+    minZoomOverride: true,
+    minZoom: 2,
+  };
+}
+```
+
 ---
 
 (*Really big thanks to [April Arcus](https://github.com/AprilArcus) for documentation fixes*)   

src/google_map.js

@@ -306,6 +306,13 @@ export default class GoogleMap extends Component {
     return DEFAULT_MIN_ZOOM;
   }
 
+  _computeMinZoom = (minZoomOverride, minZoom) => {
+    if (minZoomOverride) {
+      return minZoom ? minZoom : DEFAULT_MIN_ZOOM;
+    }
+    return this._getMinZoom();
+  }
+
   _initMap = () => {
     // only initialize the map once
     if (this.initialized_) {
@@ -356,7 +363,7 @@ export default class GoogleMap extends Component {
       const draggableOptions = this.props.draggable !== undefined &&
         {draggable: this.props.draggable};
 
-      const minZoom = this._getMinZoom();
+      const minZoom = this._computeMinZoom(options.minZoomOverride, options.minZoom);
       this.minZoom_ = minZoom;
 
       const preMapOptions = {
@@ -494,7 +501,9 @@ export default class GoogleMap extends Component {
       maps.event.addListener(map, 'idle', () => {
         if (this.resetSizeOnIdle_) {
           this._setViewSize();
-          const currMinZoom = this._getMinZoom();
+          const currMinZoom = this._computeMinZoom(
+            this.props.options.minZoomOverride,
+            this.props.options.minZoom);
 
           if (currMinZoom !== this.minZoom_) {
             this.minZoom_ = currMinZoom;