/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/map.py
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revision 245 by bh, Mon Jul 29 13:37:55 2002 UTC revision 546 by jonathan, Thu Mar 20 09:44:20 2003 UTC
# Line 7  Line 7 
7    
8  __version__ = "$Revision$"  __version__ = "$Revision$"
9    
10  from messages import LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \  #from messages import MAP_LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
11       CHANGED, LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \       #CHANGED, LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \
12       LAYER_VISIBILITY_CHANGED       #LAYER_VISIBILITY_CHANGED
13    
14    from messages import *
15    
16    from Thuban import _
17    
18  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
19    
# Line 25  class Map(TitledObject, Modifiable): Line 29  class Map(TitledObject, Modifiable):
29    
30          TITLE_CHANGED -- The title has changed. Parameter: the map.          TITLE_CHANGED -- The title has changed. Parameter: the map.
31    
32          LAYERS_CHANGED -- Layers were added, removed or rearranged.          MAP_LAYERS_CHANGED -- Layers were added, removed or rearranged.
33                          Parameters: the map                          Parameters: the map
34    
35          MAP_PROJECTION_CHANGED -- the map's projection has changed.          MAP_PROJECTION_CHANGED -- the map's projection has changed.
36                          Parameter: the map                          Parameter: the map
37      """      """
38    
39      forwarded_channels = (LAYER_PROJECTION_CHANGED,      forwarded_channels = (CHANGED,
40                              LAYER_PROJECTION_CHANGED,
41                            LAYER_LEGEND_CHANGED,                            LAYER_LEGEND_CHANGED,
42                            LAYER_VISIBILITY_CHANGED)                            LAYER_VISIBILITY_CHANGED)
43    
44      def __init__(self, title, projection = None):      def __init__(self, title, projection = None):
45          """Initialize the map."""          """Initialize the map."""
46          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
47            Modifiable.__init__(self)
48          self.layers = []          self.layers = []
49          self.label_layer = LabelLayer("Labels")          self.label_layer = LabelLayer(_("Labels"))
50          self.label_layer.Subscribe(CHANGED, self.forward, LAYERS_CHANGED)          self.label_layer.Subscribe(CHANGED, self.forward, MAP_LAYERS_CHANGED)
51          self.projection = projection          self.projection = projection
52    
53      def Destroy(self):      def Destroy(self):
54          for layer in self.layers:          # call Modifiable.Destroy first since it will call
55              self.unsubscribe_layer_channels(layer)          # Publisher.Destroy which removes all subscriptions. Otherwise
56              layer.Destroy()          # clearing the layers results in messages to be sent which can
57          self.label_layer.Unsubscribe(CHANGED, self.forward, LAYERS_CHANGED)          # cause problems.
58          Modifiable.Destroy(self)          Modifiable.Destroy(self)
59            self.ClearLayers()
60            self.label_layer.Unsubscribe(CHANGED, self.forward, MAP_LAYERS_CHANGED)
61            self.label_layer.Destroy()
62    
63      def AddLayer(self, layer):      def AddLayer(self, layer):
64            """Append layer to the map on top opf all."""
65          self.layers.append(layer)          self.layers.append(layer)
66          self.subscribe_layer_channels(layer)          self.subscribe_layer_channels(layer)
67          self.changed(LAYERS_CHANGED, self)          self.changed(MAP_LAYERS_CHANGED, self)
68            self.changed(MAP_LAYERS_ADDED, self)
69    
70      def RemoveLayer(self, layer):      def RemoveLayer(self, layer):
71            """Remove layer from the map."""
72          self.unsubscribe_layer_channels(layer)          self.unsubscribe_layer_channels(layer)
73          self.layers.remove(layer)          self.layers.remove(layer)
74          self.changed(LAYERS_CHANGED, self)          self.changed(MAP_LAYERS_CHANGED, self)
75            self.changed(MAP_LAYERS_REMOVED, self)
76          layer.Destroy()          layer.Destroy()
77    
78        def CanRemoveLayer(self, layer):
79            """Return true if the layer can be deleted.
80    
81            The default implementation always returns 1. Derived classes
82            should override this method if they have e.g. special layers
83            that the user should not be able to remove.
84            """
85            return 1
86    
87        def ClearLayers(self):
88            """Delete all layers."""
89            for layer in self.layers:
90                self.unsubscribe_layer_channels(layer)
91                layer.Destroy()
92            del self.layers[:]
93            self.label_layer.ClearLabels()
94            self.changed(MAP_LAYERS_CHANGED, self)
95            self.changed(MAP_LAYERS_REMOVED, self)
96    
97      def subscribe_layer_channels(self, layer):      def subscribe_layer_channels(self, layer):
98          """Subscribe to some of layer's channels."""          """Subscribe to some of layer's channels."""
99          for channel in self.forwarded_channels:          for channel in self.forwarded_channels:
# Line 77  class Map(TitledObject, Modifiable): Line 109  class Map(TitledObject, Modifiable):
109          return self.label_layer          return self.label_layer
110    
111      def Layers(self):      def Layers(self):
112            """Return the list of layers contained in the map.
113    
114            The list does not include the label layer"""
115          return self.layers          return self.layers
116    
117      def HasLayers(self):      def HasLayers(self):
118            """Return true if the map has at least one shape layer"""
119          return len(self.layers) > 0          return len(self.layers) > 0
120    
121      def RaiseLayer(self, layer):      def RaiseLayer(self, layer):
122            """Swap the layer with the one above it.
123    
124            If the layer is already at the top do nothing. If the stacking
125            order has been changed, issue a MAP_LAYERS_CHANGED message.
126            """
127          index = self.layers.index(layer)          index = self.layers.index(layer)
128          if index < len(self.layers) - 1:          if index < len(self.layers) - 1:
129              del self.layers[index]              del self.layers[index]
130              self.layers.insert(index + 1, layer)              self.layers.insert(index + 1, layer)
131          self.changed(LAYERS_CHANGED, self)              self.changed(MAP_LAYERS_CHANGED, self)
132                self.changed(MAP_STACKING_CHANGED, self)
133    
134      def LowerLayer(self, layer):      def LowerLayer(self, layer):
135            """Swap the layer with the one below it.
136    
137            If the layer is already at the bottom do nothing. If the
138            stacking order has been changed, issue a MAP_LAYERS_CHANGED message.
139            """
140          index = self.layers.index(layer)          index = self.layers.index(layer)
141          if index > 0:          if index > 0:
142              del self.layers[index]              del self.layers[index]
143              self.layers.insert(index - 1, layer)              self.layers.insert(index - 1, layer)
144          self.changed(LAYERS_CHANGED, self)              self.changed(MAP_LAYERS_CHANGED, self)
145                self.changed(MAP_STACKING_CHANGED, self)
146    
147      def BoundingBox(self):      def BoundingBox(self):
148          """Return the bounding box of the map in projected coordinates.          """Return the bounding box of the map in Lat/Lon coordinates.
149    
150          Return None if there are no layers or no layer contains any shapes.          Return None if there are no layers or no layer contains any shapes.
151          """          """
# Line 126  class Map(TitledObject, Modifiable): Line 174  class Map(TitledObject, Modifiable):
174              return None              return None
175    
176      def ProjectedBoundingBox(self):      def ProjectedBoundingBox(self):
177            """Return the bounding box of the map in projected coordinates.
178    
179            Return None if there are no layers or no layer contains any shapes.
180            """
181          # This simply returns the rectangle given by the projected          # This simply returns the rectangle given by the projected
182          # corners of the non-projected bbox.          # corners of the non-projected bbox.
183          bbox = self.BoundingBox()          bbox = self.BoundingBox()
# Line 134  class Map(TitledObject, Modifiable): Line 186  class Map(TitledObject, Modifiable):
186          return bbox          return bbox
187    
188      def SetProjection(self, projection):      def SetProjection(self, projection):
189            """Set the projection of the map.
190    
191            Issue a MAP_PROJECTION_CHANGED message."""
192          self.projection = projection          self.projection = projection
193          self.changed(MAP_PROJECTION_CHANGED, self)          self.changed(MAP_PROJECTION_CHANGED, self)
194    
# Line 163  class Map(TitledObject, Modifiable): Line 218  class Map(TitledObject, Modifiable):
218      def TreeInfo(self):      def TreeInfo(self):
219          items = []          items = []
220          if self.BoundingBox() != None:          if self.BoundingBox() != None:
221              items.append("Extent (lat-lon): (%g, %g, %g, %g)"              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)")
222                           % self.BoundingBox())                           % self.BoundingBox())
223              if self.projection and len(self.projection.params) > 0:              if self.projection and len(self.projection.params) > 0:
224                  items.append("Extent (projected): (%g, %g, %g, %g)"                  items.append(_("Extent (projected): (%g, %g, %g, %g)")
225                               % self.ProjectedBoundingBox())                               % self.ProjectedBoundingBox())
226                  items.append(("Projection",                  items.append((_("Projection"),
227                                [str(param)                                [str(param)
228                                 for param in self.projection.params]))                                 for param in self.projection.params]))
229    
# Line 176  class Map(TitledObject, Modifiable): Line 231  class Map(TitledObject, Modifiable):
231          layers.reverse()          layers.reverse()
232          items.extend(layers)          items.extend(layers)
233    
234          return ("Map: %s" % self.title, items)          return (_("Map: %s") % self.title, items)
235    
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