/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/legend.py
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revision 1063 by frank, Tue May 27 14:08:28 2003 UTC revision 2560 by bh, Tue Feb 8 20:25:22 2005 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003, 2005 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
4  # Frank Koormann <[email protected]>  # Frank Koormann <[email protected]>
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
11    from  math import fabs, cos, pi
12    
13  from Thuban import _  from Thuban import _
14    
15  import resource  import resource
16    
17  from wxPython.wx import *  from wxPython.wx import *
18    import wxPython
19    
20  from Thuban.Model.layer import BaseLayer  from Thuban.Model.layer import BaseLayer
21  from Thuban.Model.map import Map  from Thuban.Model.map import Map
22  from Thuban.Model.classification import ClassGroup  from Thuban.Model.classification import ClassGroup
23    from Thuban.Model.proj import PROJ_UNITS_DEGREES
24    
25  from Thuban.Model.messages import \  from Thuban.Model.messages import \
26      MAP_STACKING_CHANGED, MAP_LAYERS_ADDED, MAP_LAYERS_REMOVED, LAYER_CHANGED,\      MAP_STACKING_CHANGED, MAP_LAYERS_ADDED, MAP_LAYERS_REMOVED, LAYER_CHANGED,\
# Line 28  from Thuban.UI.classifier import ClassDa Line 32  from Thuban.UI.classifier import ClassDa
32  from Thuban.UI.dock import DockPanel  from Thuban.UI.dock import DockPanel
33  from Thuban.UI.scalebar import ScaleBar  from Thuban.UI.scalebar import ScaleBar
34    
35    from Thuban.UI.menu import Menu
36    
37  from Thuban.Lib.connector import ConnectorError  from Thuban.Lib.connector import ConnectorError
38    
39  ID_LEGEND_TOP = 4001  ID_LEGEND_TOP = 4001
# Line 50  SHOW_BMP  = "show_layer" Line 56  SHOW_BMP  = "show_layer"
56  HIDE_BMP  = "hide_layer"  HIDE_BMP  = "hide_layer"
57  PROPS_BMP = "layer_properties"  PROPS_BMP = "layer_properties"
58    
   
59  class LegendPanel(DockPanel):  class LegendPanel(DockPanel):
60    
61      def __init__(self, parent, map, mainWindow):      def __init__(self, parent, map, mainWindow):
# Line 179  class LegendPanel(DockPanel): Line 184  class LegendPanel(DockPanel):
184          self.tree.DoOnHideLayer()          self.tree.DoOnHideLayer()
185          pass          pass
186    
187        def _OnToggleVisibility(self, event):
188            self.tree.ToggleVisibility()
189    
190        def _OnProjection(self, event):
191            self.tree.LayerProjection()
192    
193        def _OnRemoveLayer(self, event):
194            self.mainWindow.RemoveLayer()
195    
196        def _OnShowTable(self, event):
197            self.mainWindow.LayerShowTable()
198    
199      def __EnableButtons(self, on):      def __EnableButtons(self, on):
200          self.toolBar.EnableTool(ID_LEGEND_TOP, on)          self.toolBar.EnableTool(ID_LEGEND_TOP, on)
201          self.toolBar.EnableTool(ID_LEGEND_RAISE, on)          self.toolBar.EnableTool(ID_LEGEND_RAISE, on)
# Line 201  class LegendTree(wxTreeCtrl): Line 218  class LegendTree(wxTreeCtrl):
218          self.mainWindow = mainWindow          self.mainWindow = mainWindow
219          self.map = None          self.map = None
220          self.parent = parent          self.parent = parent
221          self.layer2id = {}          self.changing_selection = 0
222    
223            #
224            # The image list used by the wxTreeCtrl causes problems when
225            # we remove layers and/or change a classification because it
226            # changes the image indices if you remove images from the list.
227            # Rather than removing unused images we use this list to keep
228            # track of which indices are available in the image list
229            # (because of a previous removal) and then  replace those indices
230            # with new images rather than appending to the end of the image
231            # list (assuming there are any that are available).
232            #
233            self.availImgListIndices = []
234    
235          self.image_list = None          self.image_list = None
236          self.emptyImageIndex = 0          self.emptyImageIndex = 0
237    
238          self.previewer = ClassDataPreviewer()          self.previewer = ClassDataPreviewer()
239    
240            self.preventExpandCollapse = False
241            self.raiseProperties = False
242    
243          EVT_TREE_ITEM_ACTIVATED(self, ID_LEGEND_TREE, self._OnItemActivated)          EVT_TREE_ITEM_ACTIVATED(self, ID_LEGEND_TREE, self._OnItemActivated)
244          EVT_TREE_SEL_CHANGED(self, ID_LEGEND_TREE, self._OnSelChanged)          EVT_TREE_SEL_CHANGED(self, ID_LEGEND_TREE, self._OnSelChanged)
245            EVT_TREE_ITEM_EXPANDING(self, ID_LEGEND_TREE, self.OnItemExpandCollapse)
246            EVT_TREE_ITEM_COLLAPSING(self, ID_LEGEND_TREE, self.OnItemExpandCollapse)
247            EVT_TREE_ITEM_RIGHT_CLICK(self, ID_LEGEND_TREE, self._OnRightClick)
248    
249          EVT_CLOSE(self, self._OnClose)          EVT_CLOSE(self, self._OnClose)
250    
251          self.SetMap(map)          self.SetMap(map)
252    
253        def _OnRightClick(self, event):
254            """Select item and pop up a context menu"""
255    
256            # The pop up menu is related to the legend tree, so we have direct
257            # access on the tree items. The events issued by the menu are handled
258            # by the legend panel, since most of the handlers are already
259            # implemented there.
260    
261            # Update item selection to the right click
262            item = event.GetItem()
263            self.SelectItem(item)
264    
265            # Define the menu
266            popup_menu = Menu("PopUp", "",
267                              [ "layer_visibility",
268                                None,
269                                "layer_properties",
270                                "layer_projection",
271                                "layer_remove",
272                                "layer_show_table",
273                                None,
274                                "layer_to_top",
275                                "layer_raise",
276                                "layer_lower",
277                                "layer_to_bottom"
278                                ])
279    
280            # Display the menu
281            pos = event.GetPoint()
282            shift = self.ClientToScreen((0,0))
283            self.PopupMenu(self.mainWindow.build_menu(popup_menu), pos)
284    
285        def find_layer(self, layer):
286            """Return the tree item for the layer"""
287            root = self.GetRootItem()
288            id, cookie = self.GetFirstChild(root)
289            while id.IsOk():
290                if self.GetPyData(id) is layer:
291                    return id
292                id, cookie = self.GetNextChild(root, cookie)
293            return None
294    
295      def _OnClose(self, event):      def _OnClose(self, event):
296          self.SetMap(None)          self.SetMap(None)
297    
# Line 224  class LegendTree(wxTreeCtrl): Line 301  class LegendTree(wxTreeCtrl):
301      def SetMap(self, map):      def SetMap(self, map):
302    
303          sub_list = [(MAP_STACKING_CHANGED, self._OnMsgMapStackingChanged),          sub_list = [(MAP_STACKING_CHANGED, self._OnMsgMapStackingChanged),
304                      (MAP_LAYERS_ADDED, self._OnMsgMapLayersAddedRemoved),                      (MAP_LAYERS_ADDED, self._OnMsgMapLayersAdded),
305                      (MAP_LAYERS_REMOVED, self._OnMsgMapLayersAddedRemoved)]                      (MAP_LAYERS_REMOVED, self._OnMsgMapLayersRemoved)]
306    
307          if self.map is not None:          if self.map is not None:
308              for msg, func in sub_list: self.map.Unsubscribe(msg, func)              for msg, func in sub_list: self.map.Unsubscribe(msg, func)
# Line 236  class LegendTree(wxTreeCtrl): Line 313  class LegendTree(wxTreeCtrl):
313                      #self._OnMsgMapsChanged)                      #self._OnMsgMapsChanged)
314              #except ConnectorError:              #except ConnectorError:
315                  #pass                  #pass
316              self.__DeleteAllItems()              self.DeleteAllItems()
317                    
318          self.map = map          self.map = map
319    
# Line 252  class LegendTree(wxTreeCtrl): Line 329  class LegendTree(wxTreeCtrl):
329          layer, group = self.GetSelectedHierarchy()          layer, group = self.GetSelectedHierarchy()
330    
331          if layer is not None:          if layer is not None:
332              self.map.TopLayer(layer)              self.map.MoveLayerToTop(layer)
333          else:          else:
334              assert False, "Shouldn't be allowed."              assert False, "Shouldn't be allowed."
335              pass              pass
# Line 279  class LegendTree(wxTreeCtrl): Line 356  class LegendTree(wxTreeCtrl):
356          layer, group = self.GetSelectedHierarchy()          layer, group = self.GetSelectedHierarchy()
357    
358          if layer is not None:          if layer is not None:
359              self.map.BottomLayer(layer)              self.map.MoveLayerToBottom(layer)
360          else:          else:
361              assert False, "Shouldn't be allowed."              assert False, "Shouldn't be allowed."
362              pass              pass
# Line 296  class LegendTree(wxTreeCtrl): Line 373  class LegendTree(wxTreeCtrl):
373              return wxTreeCtrl.OnCompareItems(self, item1, item2)              return wxTreeCtrl.OnCompareItems(self, item1, item2)
374    
375      def DoOnShowLayer(self):      def DoOnShowLayer(self):
         #self.__ShowHideLayer(True)  
376          layer, group = self.GetSelectedHierarchy()          layer, group = self.GetSelectedHierarchy()
377          layer.SetVisible(True)          layer.SetVisible(True)
378    
379      def DoOnHideLayer(self):      def DoOnHideLayer(self):
         #self.__ShowHideLayer(False)  
380          layer, group = self.GetSelectedHierarchy()          layer, group = self.GetSelectedHierarchy()
381          layer.SetVisible(False)          layer.SetVisible(False)
382    
383        def ToggleVisibility(self):
384            layer, group = self.GetSelectedHierarchy()
385    
386            layer.SetVisible(not layer.Visible())
387    
388        def LayerProjection(self):
389            self.parent.mainWindow.LayerProjection()
390    
391      def Sort(self):      def Sort(self):
392          self.SortChildren(self.GetRootItem())          self.SortChildren(self.GetRootItem())
393    
# Line 330  class LegendTree(wxTreeCtrl): Line 413  class LegendTree(wxTreeCtrl):
413          self.SetMap(self.mainWindow.Map())          self.SetMap(self.mainWindow.Map())
414                    
415      def _OnSelChanged(self, event):      def _OnSelChanged(self, event):
416            # If we change the selection from normalize_selection do nothing.
417            if self.changing_selection:
418                return
419    
420            self.normalize_selection()
421          self.__UpdateSelection()          self.__UpdateSelection()
422    
423        def normalize_selection(self):
424            """Select the layer containing currently selected item"""
425            # This is really a workaround for a bug in wx where deleting a
426            # subtree with DeleteChildren does not update the selection
427            # properly and can lead to segfaults later because the return
428            # value of GetSelection points to invalid data.
429            item = self.GetSelection()
430            while item.IsOk():
431                object = self.GetPyData(item)
432                if isinstance(object, BaseLayer):
433                    break
434                item = self.GetItemParent(item)
435            else:
436                # No layer was found in the chain of parents, so there's
437                # nothing we can do.
438                return
439    
440            self.changing_selection = 1
441            try:
442                self.SelectItem(item)
443            finally:
444                self.changing_selection = 0
445    
446    
447        def OnItemExpandCollapse(self, event):
448            if self.preventExpandCollapse:
449                event.Veto()
450                self.preventExpandCollapse = False
451    
452      def _OnItemActivated(self, event):      def _OnItemActivated(self, event):
453          self.parent.DoOnProperties()          # The following looks strange but is need under Windows to
454            # raise the Properties on double-click: The tree control
455            # always gets an Expanded / Collapsed event after the ItemActivated
456            # on double click, which raises the main window again. We add a second
457            # ItemActivated event to the queue, which simply raises the already
458            # displayed window.
459            if self.raiseProperties:
460                self.parent.DoOnProperties()
461                self.raiseProperties = False
462            else:
463                self.raiseProperties = True
464                self.preventExpandCollapse = True
465                self.parent.DoOnProperties()
466                self.AddPendingEvent(event)
467    
468      def _OnMsgLayerChanged(self, layer):      def _OnMsgLayerChanged(self, layer):
469          assert isinstance(layer, BaseLayer)          assert isinstance(layer, BaseLayer)
470    
471          id = self.layer2id[layer]          id = self.find_layer(layer)
472          assert id.IsOk()          assert id is not None
473    
474          # XXX: yikes! this is so bad, we should be doing what is          self.__FillTreeLayer(id)
         #      commented out, but there is a problem with keeping  
         #      track of the images in the image list when we replace  
         #      a layer. it ends up causing a seg fault.  
         self.__FillTree(self.map)  
475          self.__UpdateSelection()          self.__UpdateSelection()
         #self.__FillTreeLayer(id)  
476    
477      def _OnMsgMapStackingChanged(self, *args):      def _OnMsgMapStackingChanged(self, *args):
478          self.Sort()          self.Sort()
# Line 357  class LegendTree(wxTreeCtrl): Line 482  class LegendTree(wxTreeCtrl):
482              self.EnsureVisible(id)              self.EnsureVisible(id)
483          self.__UpdateSelection()          self.__UpdateSelection()
484    
485      def _OnMsgMapLayersAddedRemoved(self, map):      def _OnMsgMapLayersAdded(self, map):
486          assert map is self.map          assert map is self.map
487    
488          self.__FillTree(self.map)          # Build a dict with all layers known by the the tree as keys
489            layers = {}
490            root = self.GetRootItem()
491            id, cookie = self.GetFirstChild(root)
492            while id.IsOk():
493                layers[self.GetPyData(id)] = 1
494                id, cookie = self.GetNextChild(root, cookie)
495    
496            # Add layers in the map but not in the dict
497            i = 0
498            for l in map.Layers():
499                if not l in layers:
500                    self.__AddLayer(i, l)
501    
502            self.__UpdateSelection()
503    
504        def _OnMsgMapLayersRemoved(self, map):
505            assert map is self.map
506    
507            layers = map.Layers()
508    
509            root = self.GetRootItem()
510            id, cookie = self.GetFirstChild(root)
511            while id.IsOk():
512                if self.GetPyData(id) not in layers:
513                    self.__RemoveLayer(id)
514                id, cookie = self.GetNextChild(root, cookie)
515    
516    
517          self.__UpdateSelection()          self.__UpdateSelection()
518    
519      def _OnMsgLayerVisibilityChanged(self, layer):      def _OnMsgLayerVisibilityChanged(self, layer):
# Line 371  class LegendTree(wxTreeCtrl): Line 524  class LegendTree(wxTreeCtrl):
524    
525      def _OnMsgLayerTitleChanged(self, layer):      def _OnMsgLayerTitleChanged(self, layer):
526    
527          id = self.layer2id[layer]          id = self.find_layer(layer)
528          if id.IsOk():          if id.IsOk():
529              self.SetItemText(id, layer.Title())              self.SetItemText(id, layer.Title())
530          self.__UpdateSelection()          self.__UpdateSelection()
# Line 384  class LegendTree(wxTreeCtrl): Line 537  class LegendTree(wxTreeCtrl):
537    
538          self.Freeze()          self.Freeze()
539    
540          self.__DeleteAllItems()          self.DeleteAllItems()
541    
542          if map.HasLayers():          if map.HasLayers():
543                root = self.GetRootItem()
             self.image_list = wxImageList(BMP_SIZE_W, BMP_SIZE_H, False, 0)  
                                                                                   
             bmp = wxEmptyBitmap(BMP_SIZE_W, BMP_SIZE_H)  
             dc = wxMemoryDC()  
             dc.SelectObject(bmp)  
             dc.SetBrush(wxBLACK_BRUSH)  
             dc.Clear()  
             dc.SelectObject(wxNullBitmap)  
                                                                                   
             self.emptyImageIndex = \  
                 self.image_list.AddWithColourMask(bmp, wxColour(0, 0, 0))  
                                                                                   
             bmp = resource.GetBitmapResource("legend_icon_layer",  
                                               wxBITMAP_TYPE_XPM)  
             self.mapImageIndex = \  
                 self.image_list.Add(bmp)  
   
             self.AssignImageList(self.image_list)  
   
             root = self.AddRoot("")  
   
544              for l in map.Layers():              for l in map.Layers():
545                  id = self.PrependItem(root, l.Title())                  self.__AddLayer(0, l)
                 self.SetItemImage(id, self.mapImageIndex)  
                 self.SetItemSelectedImage(id, self.mapImageIndex)  
   
                 l.Subscribe(LAYER_CHANGED, self._OnMsgLayerChanged)  
                 l.Subscribe(LAYER_VISIBILITY_CHANGED,  
                             self._OnMsgLayerVisibilityChanged)  
                 l.Subscribe(TITLE_CHANGED, self._OnMsgLayerTitleChanged)  
                 self.SetPyData(id, l)  
                 self.__SetVisibilityStyle(l.Visible(), id)  
   
                 self.layer2id[l] = id  
   
                 self.__FillTreeLayer(id)  
                 self.Expand(id)  
546    
547          self.Thaw()          self.Thaw()
548    
# Line 454  class LegendTree(wxTreeCtrl): Line 572  class LegendTree(wxTreeCtrl):
572                          self.SetItemImage(id, -1)                          self.SetItemImage(id, -1)
573                          self.SetItemSelectedImage(id, -1)                          self.SetItemSelectedImage(id, -1)
574                      else:                      else:
575                          i = self.image_list.Add(bmp)                          if self.availImgListIndices:
576                                i = self.availImgListIndices.pop(0)
577                                self.image_list.Replace(i, bmp)
578                            else:
579                                i = self.image_list.Add(bmp)
580    
581                          self.SetItemImage(id, i)                          self.SetItemImage(id, i)
582                          self.SetItemSelectedImage(id, i)                          self.SetItemSelectedImage(id, i)
583    
# Line 472  class LegendTree(wxTreeCtrl): Line 595  class LegendTree(wxTreeCtrl):
595    
596          return bmp          return bmp
597    
598      def __DeleteAllItems(self):      def DeleteAllItems(self):
599    
600          while len(self.layer2id) > 0:          pid = self.GetRootItem()
             layer, id = self.layer2id.popitem()  
             layer.Unsubscribe(LAYER_CHANGED,  
                               self._OnMsgLayerChanged)  
             layer.Unsubscribe(LAYER_VISIBILITY_CHANGED,  
                               self._OnMsgLayerVisibilityChanged)  
             layer.Unsubscribe(TITLE_CHANGED, self._OnMsgLayerTitleChanged)  
601    
602          self.DeleteAllItems()          id, cookie = self.GetFirstChild(pid)
603            while id.IsOk():
604                self.__RemoveLayer(id)
605                id, cookie = self.GetNextChild(pid, cookie)
606    
607            wxTreeCtrl.DeleteAllItems(self)
608    
609        def __AddLayer(self, before, l):
610            root = self.GetRootItem()
611            id = self.InsertItemBefore(root, before,
612                                l.Title(),
613                                self.mapImageIndex,
614                                self.mapImageIndex)
615    
616            self.SetPyData(id, l)
617            self.__SetVisibilityStyle(l.Visible(), id)
618    
619            self.__FillTreeLayer(id)
620            self.Expand(id)
621    
622            l.Subscribe(LAYER_CHANGED, self._OnMsgLayerChanged)
623            l.Subscribe(LAYER_VISIBILITY_CHANGED,
624                        self._OnMsgLayerVisibilityChanged)
625            l.Subscribe(TITLE_CHANGED, self._OnMsgLayerTitleChanged)
626    
627        def __RemoveLayer(self, id):
628            self.DeleteChildren(id)
629    
630            layer = self.GetPyData(id)
631            layer.Unsubscribe(LAYER_CHANGED,
632                              self._OnMsgLayerChanged)
633            layer.Unsubscribe(LAYER_VISIBILITY_CHANGED,
634                              self._OnMsgLayerVisibilityChanged)
635            layer.Unsubscribe(TITLE_CHANGED, self._OnMsgLayerTitleChanged)
636    
637            self.Delete(id)
638    
639        def DeleteChildren(self, pid):
640            id, cookie = self.GetFirstChild(pid)
641            while id.IsOk():
642                self.availImgListIndices.append(self.GetItemImage(id))
643                id, cookie = self.GetNextChild(pid, cookie)
644            wxTreeCtrl.DeleteChildren(self, pid)
645    
646        def GetRootItem(self):
647            root = wxTreeCtrl.GetRootItem(self)
648    
649            if not root.IsOk():
650                self.image_list = wxImageList(BMP_SIZE_W, BMP_SIZE_H, False, 0)
651    
652                bmp = wxEmptyBitmap(BMP_SIZE_W, BMP_SIZE_H)
653                dc = wxMemoryDC()
654                dc.SelectObject(bmp)
655                dc.SetBrush(wxBLACK_BRUSH)
656                dc.Clear()
657                dc.SelectObject(wxNullBitmap)
658    
659                self.emptyImageIndex = \
660                    self.image_list.AddWithColourMask(bmp, wxColour(0, 0, 0))
661    
662                bmp = resource.GetBitmapResource("legend_icon_layer",
663                                                  wxBITMAP_TYPE_XPM)
664                self.mapImageIndex = \
665                    self.image_list.Add(bmp)
666    
667                self.AssignImageList(self.image_list)
668                self.availImgListIndices = []
669    
670                root = self.AddRoot("")
671    
672            return root
673    
674      def __SetVisibilityStyle(self, visible, id):      def __SetVisibilityStyle(self, visible, id):
675          font = self.GetItemFont(id)          font = self.GetItemFont(id)
# Line 499  class LegendTree(wxTreeCtrl): Line 686  class LegendTree(wxTreeCtrl):
686          self.SetItemFont(id, font)          self.SetItemFont(id, font)
687                    
688      def __ShowHideLayer(self, layer):      def __ShowHideLayer(self, layer):
689          parent = self.layer2id[layer]          parent = self.find_layer(layer)
690          assert parent.IsOk()          assert parent.IsOk()
691    
692          visible = layer.Visible()          visible = layer.Visible()
693    
694          self.__SetVisibilityStyle(visible, parent)          self.__SetVisibilityStyle(visible, parent)
695    
696          id, cookie = self.GetFirstChild(parent, 123)          id, cookie = self.GetFirstChild(parent)
697    
698          while id.IsOk():          while id.IsOk():
699              self.__SetVisibilityStyle(visible, id)              self.__SetVisibilityStyle(visible, id)
700              id, cookie = self.GetNextChild(parent, cookie)              id, cookie = self.GetNextChild(parent, cookie)
701                
702        # In wxPython 2.4 the GetFirstChild method has to be called with a
703        # second argument and in 2.5 it must not.  Reading the code of
704        # wxPython 2.4 it seems that the second parameter was intended to be
705        # optional there but due to a bug in the C++ code it doesn't work
706        # and omitting the second argument leads to a segfault.  To cope
707        # with this and to make the code usable with both 2.5 and 2.4 we
708        # overwrite the inherited method when running with 2.4 to provide a
709        # default value for the second argument.
710        if map(int, wxPython.__version__.split(".")[:2]) < [2, 5]:
711            def GetFirstChild(self, item):
712                return wxTreeCtrl.GetFirstChild(self, item, 0)
713    
714    
715  class ScaleBarBitmap(wxBoxSizer):  class ScaleBarBitmap(wxBoxSizer):
716    
717      def __init__(self, parent, map, mainWindow):      def __init__(self, parent, map, mainWindow):
# Line 553  class ScaleBarBitmap(wxBoxSizer): Line 753  class ScaleBarBitmap(wxBoxSizer):
753          dc.SelectObject(bmp)          dc.SelectObject(bmp)
754          dc.Clear()          dc.Clear()
755    
756          self.scalebar.DrawScaleBar(scale, dc, (0,0), dc.GetSizeTuple())          if self.canvas.map is not None \
757                and self.canvas.map.projection is not None:
758    
759                # if we are using a projection with geographics coordinates
760                # we need to change the scale value based on where we are
761                # on the globe.
762                if self.canvas.map.projection.GetProjectedUnits() \
763                    == PROJ_UNITS_DEGREES:
764    
765                    width, height = self.canvas.GetSizeTuple()
766                    long, lat = self.canvas.win_to_proj(width/2, height/2)
767    
768                    # slightly inaccurate, but if we are looking at
769                    # the north/south pole we could end up dividing by zero
770                    #
771                    # it shouldn't matter for our purposes that we ignore
772                    # the original sign of lat.
773                    if fabs(lat) > 89.9: lat = 89.9
774    
775                    #
776                    # one degree is about 111,133m at the equator
777                    # we need to adjust that for latitude as
778                    # we move north/south. use the center of the map
779                    # as the point to scale the length to.
780                    #
781                    scale = scale / (111133.0 * fabs(cos(lat * pi/180)))
782    
783                self.scalebar.DrawScaleBar(scale, dc, (0,0), dc.GetSizeTuple())
784    
785          self.scalebarBitmap.SetBitmap(bmp)          self.scalebarBitmap.SetBitmap(bmp)
786    
Legend:
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