pyic_view: Adds ability to zoom in map.

scripts/pyic_view.py

@@ -164,6 +164,25 @@ class view(object):
         res_menu.grid(row=3, column=0)
         res_menu.bind("<<ComboboxSelected>>", self.make_new_axis)
 
+        # Button to activate zoom mode
+        self.zoom_button = ttk.Button(root, text="Enable Zoom", command=self.activate_zoom)
+        self.zoom_button.grid(row=3, column=2)
+
+        # Variables to store zoom area
+        self.press_event = None
+        self.rect = None
+
+        # Variables to store zoom area
+        self.press_event = None
+        self.rect = None
+
+        # proj entry
+        print('Setup proj dropdown')
+        res_menu = ttk.Combobox(root, textvariable=self.selected_proj, 
+            values=self.proj_all, state="readonly")
+        res_menu.grid(row=3, column=3)
+        res_menu.bind("<<ComboboxSelected>>", self.make_new_axis)
+
         # initial plot
         self.plot_data()
         self.canvas.draw()
@@ -173,6 +192,54 @@ class view(object):
         root.mainloop()
         return
 
+    # for zoom
+    def activate_zoom(self):
+        """Activates zooming mode by connecting event handlers."""
+        self.cid_press = self.canvas.mpl_connect("button_press_event", self.on_press)
+        self.cid_release = self.canvas.mpl_connect("button_release_event", self.on_release)
+        self.cid_motion = self.canvas.mpl_connect("motion_notify_event", self.on_motion)
+
+    # for zoom
+    def on_press(self, event):
+        """Stores the initial click position."""
+        if event.xdata is not None and event.ydata is not None:
+            self.press_event = (event.xdata, event.ydata)
+            self.rect = self.ax.add_patch(plt.Rectangle(self.press_event, 0, 0, fill=False, color="red", linestyle="dashed"))
+            self.canvas.draw()
+
+    # for zoom
+    def on_motion(self, event):
+        """Updates the rectangle while dragging."""
+        if self.press_event and event.xdata is not None and event.ydata is not None:
+            x0, y0 = self.press_event
+            width = event.xdata - x0
+            height = event.ydata - y0
+            self.rect.set_width(width)
+            self.rect.set_height(height)
+            self.canvas.draw()
+
+    # for zoom
+    def on_release(self, event):
+        """Zooms into the selected rectangle and removes it."""
+        if self.press_event and event.xdata is not None and event.ydata is not None:
+            x0, y0 = self.press_event
+            x1, y1 = event.xdata, event.ydata
+
+            # Ensure correct ordering of coordinates
+            self.ax.set_xlim(min(x0, x1), max(x0, x1))
+            self.ax.set_ylim(min(y0, y1), max(y0, y1))
+
+            # Remove the rectangle and redraw
+            self.rect.remove()
+            self.rect = None
+            self.press_event = None
+            self.canvas.draw()
+
+            # Disable event handlers after zooming
+            self.canvas.mpl_disconnect(self.cid_press)
+            self.canvas.mpl_disconnect(self.cid_release)
+            self.canvas.mpl_disconnect(self.cid_motion)
+
     def load_data(self):
         print('opening dataset')
         mfdset_kwargs = dict(