Merge branch 'clicked-point2' of https://github.com/ATL2001/lonboard into clicked-point2

Author: ATL2001

examples/clicked-point.ipynb

@@ -0,0 +1,68 @@
+{
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+   "cell_type": "markdown",
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+   "source": [
+    "# Clicked point\n",
+    "\n",
+    "This notebook demonstrates how you can access the coordinate of the most recent click on a Lonboard map and update a set of widgets to display the x and y coordinates using the [`ipywidgets.observe`](https://ipywidgets.readthedocs.io/en/8.1.5/examples/Widget%20Events.html#traitlet-events) method."
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+   "id": "f986a64e-269f-4966-93b0-cfa5bf1ba882",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import ipywidgets as widgets\n",
+    "import traitlets\n",
+    "\n",
+    "from lonboard import Map\n",
+    "\n",
+    "## Create a Lonboard map and two widgets to display the coordinate\n",
+    "m = Map(layers=[])\n",
+    "clicked_x_display = widgets.FloatText(description=\"last clicked x:\")\n",
+    "clicked_y_display = widgets.FloatText(description=\"last clicked y:\")\n",
+    "\n",
+    "## create a function that accepts the event which fires when we single click in\n",
+    "##  the map while we are not in bounding box selection mode\n",
+    "def on_map_click(event: traitlets.utils.bunch.Bunch) -> None:\n",
+    "    x,y = event.get(\"new\")\n",
+    "    clicked_x_display.value = x\n",
+    "    clicked_y_display.value = y\n",
+    "m.observe(on_map_click, \"clicked_point\")\n",
+    "\n",
+    "## show the widgets\n",
+    "widgets.VBox([\n",
+    "    m,\n",
+    "    clicked_x_display,\n",
+    "    clicked_y_display\n",
+    "])"
+   ]
+  }
+ ],
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