Ability to save GoogleMap to file (#174)

New function to `saveGoogleMap()`

Required making the mapData a class variable, so that it was readily
available

appJar/appjar.py

@@ -4354,6 +4354,10 @@ def getGoogleMapLocation(self, title):
 
     def getGoogleMapSize(self, title):
         return self.__verifyItem(self.n_maps, title).params["size"]
+
+    def saveGoogleMap(self, title, fileLocation):
+        gMap = self.__verifyItem(self.n_maps, title)
+        return gMap.saveTile(fileLocation)
 
 
 #####################################
@@ -10354,11 +10358,11 @@ def __init__(self, parent):
         self.__setMapParams()
 
         imgObj = None
-        mapData = self.getMapData()
+        self.mapData = self.getMapData()
         # if we got some map data then load it
-        if mapData is not None:
+        if self.mapData is not None:
             try:
-                imgObj = PhotoImage(data=mapData)
+                imgObj = PhotoImage(data=self.mapData)
                 self.h = imgObj.height()
                 self.w = imgObj.width()
             # python 3.3 fails to load data
@@ -10469,6 +10473,16 @@ def addMarker(self, location):
         self.markers.append(location)
         self.parent.after(0, self.updateMap())
 
+    def saveTile(self, location):
+        try:
+            with open(location, "wb") as fh:
+                fh.write(self.mapData)
+            logging.getLogger("appJar").info("Map data written to file: " + str(location))
+            return True
+        except  Exception as e:
+            logging.getLogger("appJar").exception(e)
+            return False
+
     def setSize(self, size):
         if size != self.params["size"]:
             self.params["size"] = size.lower()
@@ -10502,9 +10516,9 @@ def zoom(self, mod):
             self.parent.after(0, self.updateMap())
 
     def updateMap(self):
-        mapData = self.getMapData()
-        if mapData is not None:
-            imgObj = PhotoImage(data=mapData)
+        self.mapData = self.getMapData()
+        if self.mapData is not None:
+            imgObj = PhotoImage(data=self.mapData)
             self.canvas.itemconfig(self.image_on_canvas, image=imgObj)
             self.canvas.img = imgObj
 

docs/mkdocs/docs/pythonDevWidgets.md

@@ -94,6 +94,12 @@ app.go()
 * `.getGoogleMapSize(title)`  
     Returns the current size of the map tile.  
 
+#### Save GoogleMaps  
+
+* `.saveGoogleMap(title, fileName)`  
+    Saves the currently displayed map to the named location.  
+    By default, all map tiles are GIFs.  
+
 ###PieChart
 ---
 Widget to depict a Pie Chart.  

examples/issues/issue136.py

@@ -13,6 +13,8 @@ def press(btn):
         app.setGoogleMapSize("m1", app.getEntry("e1"))
     elif btn == "MARK": 
         app.setGoogleMapMarker("m1", app.getEntry("e1"))
+    elif btn == "SAVE": 
+        app.saveGoogleMap("m1", app.getEntry("e1"))
     else:
         app.zoomGoogleMap("m1", btn)
 
@@ -23,7 +25,7 @@ def press(btn):
 app.setGoogleMapMarker("m1", "swindon")
 app.setGoogleMapSize("m1", "340x500")
 app.addEntry("e1")
-app.addButtons(["SEARCH", "+", "-", "ZOOM", "SIZE", "TERRAIN", "MARK"], press)
+app.addButtons(["SAVE", "SEARCH", "+", "-", "ZOOM", "SIZE", "TERRAIN", "MARK"], press)
 
 app.go()