/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/map.py
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revision 249 by bh, Tue Jul 30 14:17:33 2002 UTC revision 1099 by jonathan, Fri May 30 06:28:02 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, LAYER_CHANGED, MAP_STACKING_CHANGED, \
13         MAP_LAYERS_ADDED, MAP_LAYERS_REMOVED
14    
15    from Thuban import _
16    
17  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
18    
19  from label import LabelLayer  from label import LabelLayer
20    
21    
   
22  class Map(TitledObject, Modifiable):  class Map(TitledObject, Modifiable):
23    
24      """Represent a map. A map is simply a list of layers.      """Represent a map. A map is simply a list of layers.
# Line 25  class Map(TitledObject, Modifiable): Line 27  class Map(TitledObject, Modifiable):
27    
28          TITLE_CHANGED -- The title has changed. Parameter: the map.          TITLE_CHANGED -- The title has changed. Parameter: the map.
29    
30          LAYERS_CHANGED -- Layers were added, removed or rearranged.          MAP_LAYERS_CHANGED -- Layers were added, removed or rearranged.
31                          Parameters: the map                          Parameters: the map
32    
33          MAP_PROJECTION_CHANGED -- the map's projection has changed.          MAP_PROJECTION_CHANGED -- the map's projection has changed.
34                          Parameter: the map                          Parameter: the map
35      """      """
36    
37      forwarded_channels = (LAYER_PROJECTION_CHANGED,      forwarded_channels = (CHANGED,
38                              LAYER_PROJECTION_CHANGED,
39                            LAYER_LEGEND_CHANGED,                            LAYER_LEGEND_CHANGED,
40                              LAYER_CHANGED,
41                            LAYER_VISIBILITY_CHANGED)                            LAYER_VISIBILITY_CHANGED)
42    
43      def __init__(self, title, projection = None):      def __init__(self, title, projection = None):
44          """Initialize the map."""          """Initialize the map."""
45          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
46            Modifiable.__init__(self)
47          self.layers = []          self.layers = []
48          self.label_layer = LabelLayer("Labels")          self.label_layer = LabelLayer(_("Labels"))
49          self.label_layer.Subscribe(CHANGED, self.forward, LAYERS_CHANGED)          self.label_layer.Subscribe(CHANGED, self.forward, MAP_LAYERS_CHANGED)
50          self.projection = projection          self.projection = projection
51    
52      def Destroy(self):      def Destroy(self):
# Line 51  class Map(TitledObject, Modifiable): Line 56  class Map(TitledObject, Modifiable):
56          # cause problems.          # cause problems.
57          Modifiable.Destroy(self)          Modifiable.Destroy(self)
58          self.ClearLayers()          self.ClearLayers()
59          self.label_layer.Unsubscribe(CHANGED, self.forward, LAYERS_CHANGED)          self.label_layer.Unsubscribe(CHANGED, self.forward, MAP_LAYERS_CHANGED)
60          self.label_layer.Destroy()          self.label_layer.Destroy()
61    
62      def AddLayer(self, layer):      def AddLayer(self, layer):
63          """Append layer to the map on top opf all."""          """Append layer to the map on top opf all."""
64          self.layers.append(layer)          self.layers.append(layer)
65          self.subscribe_layer_channels(layer)          self.subscribe_layer_channels(layer)
66          self.changed(LAYERS_CHANGED, self)          self.changed(MAP_LAYERS_CHANGED, self)
67            self.changed(MAP_LAYERS_ADDED, self)
68    
69      def RemoveLayer(self, layer):      def RemoveLayer(self, layer):
70          """Remove layer from the map."""          """Remove layer from the map."""
71          self.unsubscribe_layer_channels(layer)          self.unsubscribe_layer_channels(layer)
72          self.layers.remove(layer)          self.layers.remove(layer)
73          self.changed(LAYERS_CHANGED, self)          self.changed(MAP_LAYERS_CHANGED, self)
74            self.changed(MAP_LAYERS_REMOVED, self)
75          layer.Destroy()          layer.Destroy()
76    
77        def CanRemoveLayer(self, layer):
78            """Return true if the layer can be deleted.
79    
80            The default implementation always returns 1. Derived classes
81            should override this method if they have e.g. special layers
82            that the user should not be able to remove.
83            """
84            return 1
85    
86      def ClearLayers(self):      def ClearLayers(self):
87          """Delete all layers."""          """Delete all layers."""
88          for layer in self.layers:          for layer in self.layers:
# Line 74  class Map(TitledObject, Modifiable): Line 90  class Map(TitledObject, Modifiable):
90              layer.Destroy()              layer.Destroy()
91          del self.layers[:]          del self.layers[:]
92          self.label_layer.ClearLabels()          self.label_layer.ClearLabels()
93          self.changed(LAYERS_CHANGED, self)          self.changed(MAP_LAYERS_CHANGED, self)
94            self.changed(MAP_LAYERS_REMOVED, self)
95    
96      def subscribe_layer_channels(self, layer):      def subscribe_layer_channels(self, layer):
97          """Subscribe to some of layer's channels."""          """Subscribe to some of layer's channels."""
# Line 100  class Map(TitledObject, Modifiable): Line 117  class Map(TitledObject, Modifiable):
117          """Return true if the map has at least one shape layer"""          """Return true if the map has at least one shape layer"""
118          return len(self.layers) > 0          return len(self.layers) > 0
119    
120        def MoveLayerToTop(self, layer):
121            """Put the layer on top of the layer stack.
122    
123            If the layer is already at the top do nothing. If the stacking
124            order has been changed, issue a MAP_LAYERS_CHANGED message.
125            """
126            index = self.layers.index(layer)
127            if index < len(self.layers) - 1:
128                del self.layers[index]
129                self.layers.append(layer)
130                self.changed(MAP_LAYERS_CHANGED, self)
131                self.changed(MAP_STACKING_CHANGED, self)
132    
133            
134      def RaiseLayer(self, layer):      def RaiseLayer(self, layer):
135          """Swap the layer with the one above it.          """Swap the layer with the one above it.
136    
137          If the layer is already at the top do nothing. If the stacking          If the layer is already at the top do nothing. If the stacking
138          order has been changed, issue a LAYERS_CHANGED message.          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 < len(self.layers) - 1:          if index < len(self.layers) - 1:
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 LowerLayer(self, layer):      def LowerLayer(self, layer):
148          """Swap the layer with the one below it.          """Swap the layer with the one below it.
149    
150          If the layer is already at the bottom do nothing. If the          If the layer is already at the bottom do nothing. If the
151          stacking order has been changed, issue a LAYERS_CHANGED message.          stacking order has been changed, issue a MAP_LAYERS_CHANGED message.
152          """          """
153          index = self.layers.index(layer)          index = self.layers.index(layer)
154          if index > 0:          if index > 0:
155              del self.layers[index]              del self.layers[index]
156              self.layers.insert(index - 1, layer)              self.layers.insert(index - 1, layer)
157              self.changed(LAYERS_CHANGED, self)              self.changed(MAP_LAYERS_CHANGED, self)
158                self.changed(MAP_STACKING_CHANGED, self)
159    
160        def MoveLayerToBottom(self, layer):
161            """Put the layer at the bottom of the stack.
162    
163            If the layer is already at the bottom do nothing. If the
164            stacking order has been changed, issue a MAP_LAYERS_CHANGED message.
165            """
166            index = self.layers.index(layer)
167            if index > 0:
168                del self.layers[index]
169                self.layers.insert(0, layer)
170                self.changed(MAP_LAYERS_CHANGED, self)
171                self.changed(MAP_STACKING_CHANGED, self)
172    
173      def BoundingBox(self):      def BoundingBox(self):
174          """Return the bounding box of the map in Lat/Lon coordinates.          """Return the bounding box of the map in Lat/Lon coordinates.
# Line 138  class Map(TitledObject, Modifiable): Line 184  class Map(TitledObject, Modifiable):
184          for layer in self.layers:          for layer in self.layers:
185              if layer is self.label_layer:              if layer is self.label_layer:
186                  continue                  continue
187              # the layer's bbox may be None if it doesn't have any layers              # the layer's bbox may be None if it doesn't have any shapes
188              bbox = layer.LatLongBoundingBox()              bbox = layer.LatLongBoundingBox()
189              if bbox is not None:              if bbox is not None:
190                  left, bottom, right, top = bbox                  left, bottom, right, top = bbox
# Line 165  class Map(TitledObject, Modifiable): Line 211  class Map(TitledObject, Modifiable):
211              bbox = self.projection.ForwardBBox(bbox)              bbox = self.projection.ForwardBBox(bbox)
212          return bbox          return bbox
213    
214        def GetProjection(self):
215            return self.projection
216    
217      def SetProjection(self, projection):      def SetProjection(self, projection):
218          """Set the projection of the map.          """Set the projection of the map.
219    
# Line 198  class Map(TitledObject, Modifiable): Line 247  class Map(TitledObject, Modifiable):
247      def TreeInfo(self):      def TreeInfo(self):
248          items = []          items = []
249          if self.BoundingBox() != None:          if self.BoundingBox() != None:
250              items.append("Extent (lat-lon): (%g, %g, %g, %g)"              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)")
251                           % self.BoundingBox())                           % self.BoundingBox())
252              if self.projection and len(self.projection.params) > 0:              if self.projection and len(self.projection.params) > 0:
253                  items.append("Extent (projected): (%g, %g, %g, %g)"                  items.append(_("Extent (projected): (%g, %g, %g, %g)")
254                               % self.ProjectedBoundingBox())                               % self.ProjectedBoundingBox())
255                  items.append(("Projection",                  items.append((_("Projection"),
256                                [str(param)                                [str(param)
257                                 for param in self.projection.params]))                                 for param in self.projection.params]))
258    
# Line 211  class Map(TitledObject, Modifiable): Line 260  class Map(TitledObject, Modifiable):
260          layers.reverse()          layers.reverse()
261          items.extend(layers)          items.extend(layers)
262    
263          return ("Map: %s" % self.title, items)          return (_("Map: %s") % self.title, items)
264    
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