Changeset 120 for trunk/python/asaplot.py

Timestamp:

12/08/04 18:10:09 (19 years ago)

Author:

cal103

Message:

Added function register() to handle mouse events.

File:

• trunk/python/asaplot.py (modified) (3 diffs)

trunk/python/asaplot.py

@@ -47 +47 @@
         self.figmgr = FigureManagerTkAgg(self.canvas, 1, self.window)
         self.window.wm_title('ASAPlot graphics window')
+
+        self.events = {'button_press':None,
+                       'button_release':None,
+                       'motion_notify':None}
 
         self.set_title(title)
@@ -293 +297 @@
         """
         self.window.destroy()
+
+
+    def register(self, type=None, func=None):
+        """
+        Register, reregister, or deregister events of type 'button_press',
+        'button_release', or 'motion_notify'.
+        
+        The specified callback function should have the following signature:
+
+            def func(event)
+
+        where event is an MplEvent instance containing the following data:
+
+            name                # Event name.
+            canvas              # FigureCanvas instance generating the event.
+            x      = None       # x position - pixels from left of canvas.
+            y      = None       # y position - pixels from bottom of canvas.
+            button = None       # Button pressed: None, 1, 2, 3.
+            key    = None       # Key pressed: None, chr(range(255)), shift,
+                                  win, or control
+            inaxes = None       # Axes instance if cursor within axes.
+            xdata  = None       # x world coordinate.
+            ydata  = None       # y world coordinate.
+
+        For example:
+
+            def mouse_move(event):
+                print event.xdata, event.ydata
+
+            a = asaplot()
+            a.register('motion_notify', mouse_move)
+
+        If func is None, the event is deregistered.
+
+        Note that in TkAgg keyboard button presses don't generate an event.
+        """
+
+        if not self.events.has_key(type): return
+
+        if func is None:
+            if self.events[type] is not None:
+                # It's not clear that this does anything.
+                self.canvas.mpl_disconnect(self.events[type])
+                self.events[type] = None
+
+                # It seems to be necessary to return events to the toolbar.
+                if type == 'motion_notify':
+                    self.canvas.mpl_connect(type + '_event',
+                        self.figmgr.toolbar.mouse_move)
+                elif type == 'button_press':
+                    self.canvas.mpl_connect(type + '_event',
+                        self.figmgr.toolbar.press)
+                elif type == 'button_release':
+                    self.canvas.mpl_connect(type + '_event',
+                        self.figmgr.toolbar.release)
+
+        else:
+            self.events[type] = self.canvas.mpl_connect(type + '_event', func)
 
 
@@ -498 +560 @@
         if l:
             if i is not None:
-                self.i = i
+                self.i = i
 
             if inc is not None:
-                self.i += inc
+                self.i += inc
 
             self.i %= l