Thuban/Model/map.py

# Copyright (c) 2001 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

from messages import LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
     CHANGED, LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \
     LAYER_VISIBILITY_CHANGED

from base import TitledObject, Modifiable

from label import LabelLayer


class Map(TitledObject, Modifiable):

    """Represent a map. A map is simply a list of layers.

    Map objects send the following message types:

        TITLE_CHANGED -- The title has changed. Parameter: the map.

        LAYERS_CHANGED -- Layers were added, removed or rearranged.
                        Parameters: the map

        MAP_PROJECTION_CHANGED -- the map's projection has changed.
                        Parameter: the map
    """

    forwarded_channels = (LAYER_PROJECTION_CHANGED,
                          LAYER_LEGEND_CHANGED,
                          LAYER_VISIBILITY_CHANGED)

    def __init__(self, title, projection = None):
        """Initialize the map."""
        TitledObject.__init__(self, title)
        self.layers = []
        self.label_layer = LabelLayer("Labels")
        self.label_layer.Subscribe(CHANGED, self.forward, LAYERS_CHANGED)
        self.projection = projection

    def Destroy(self):
        for layer in self.layers:
            layer.Destroy()
        Modifiable.Destroy(self)

    def AddLayer(self, layer):
        self.layers.append(layer)
        for channel in self.forwarded_channels:
            layer.Subscribe(channel, self.forward, channel)
        self.changed(LAYERS_CHANGED, self)

    def RemoveLayer(self, layer):
        for channel in self.forwarded_channels:
            layer.Unsubscribe(channel, self.forward, channel)
        self.layers.remove(layer)
        self.changed(LAYERS_CHANGED, self)
        layer.Destroy()

    def LabelLayer(self):
        """Return the Map's label layer"""
        return self.label_layer

    def Layers(self):
        return self.layers

    def HasLayers(self):
        return len(self.layers) > 0

    def RaiseLayer(self, layer):
        index = self.layers.index(layer)
        if index < len(self.layers) - 1:
            del self.layers[index]
            self.layers.insert(index + 1, layer)
        self.changed(LAYERS_CHANGED, self)

    def LowerLayer(self, layer):
        index = self.layers.index(layer)
        if index > 0:
            del self.layers[index]
            self.layers.insert(index - 1, layer)
        self.changed(LAYERS_CHANGED, self)

    def BoundingBox(self):
        if not self.layers:
            return None
        llx = []
        lly = []
        urx = []
        ury = []
        for layer in self.layers:
            if layer is self.label_layer:
                continue
            left, bottom, right, top = layer.LatLongBoundingBox()
            llx.append(left)
            lly.append(bottom)
            urx.append(right)
            ury.append(top)
        return (min(llx), min(lly), max(urx), max(ury))

    def ProjectedBoundingBox(self):
        # This simply returns the rectangle given by the projected
        # corners of the non-projected bbox.
        bbox = self.BoundingBox()
        if bbox is not None and self.projection is not None:
            bbox = self.projection.ForwardBBox(bbox)
        return bbox

    def SetProjection(self, projection):
        self.projection = projection
        self.changed(MAP_PROJECTION_CHANGED, self)

    def forward(self, *args):
        """Reissue events"""
        if len(args) > 1:
            args = (args[-1],) + args[:-1]
        apply(self.issue, args)

    def WasModified(self):
        """Return true if the map or one of the layers was modified"""
        if self.modified:
            return 1
        else:
            for layer in self.layers:
                if layer.WasModified():
                    return 1
            return self.label_layer.WasModified()

    def UnsetModified(self):
        """Unset the modified flag of the map and the layers"""
        Modifiable.UnsetModified(self)
        for layer in self.layers:
            layer.UnsetModified()
        self.label_layer.UnsetModified()


1	bh	6	# Copyright (c) 2001 by Intevation GmbH
2			# Authors:
3			# Bernhard Herzog <[email protected]>
4			#
5			# This program is free software under the GPL (>=v2)
6			# Read the file COPYING coming with Thuban for details.
7
8			__version__ = "$Revision$"
9
10			from messages import LAYERS_CHANGED, MAP_PROJECTION_CHANGED, \
11			CHANGED, LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \
12			LAYER_VISIBILITY_CHANGED
13
14			from base import TitledObject, Modifiable
15
16			from label import LabelLayer
17
18
19
20			class Map(TitledObject, Modifiable):
21
22			"""Represent a map. A map is simply a list of layers.
23
24			Map objects send the following message types:
25
26			TITLE_CHANGED -- The title has changed. Parameter: the map.
27
28			LAYERS_CHANGED -- Layers were added, removed or rearranged.
29			Parameters: the map
30
31			MAP_PROJECTION_CHANGED -- the map's projection has changed.
32			Parameter: the map
33			"""
34
35			forwarded_channels = (LAYER_PROJECTION_CHANGED,
36			LAYER_LEGEND_CHANGED,
37			LAYER_VISIBILITY_CHANGED)
38
39			def __init__(self, title, projection = None):
40			"""Initialize the map."""
41			TitledObject.__init__(self, title)
42			self.layers = []
43			self.label_layer = LabelLayer("Labels")
44			self.label_layer.Subscribe(CHANGED, self.forward, LAYERS_CHANGED)
45			self.projection = projection
46
47			def Destroy(self):
48			for layer in self.layers:
49			layer.Destroy()
50			Modifiable.Destroy(self)
51
52			def AddLayer(self, layer):
53			self.layers.append(layer)
54			for channel in self.forwarded_channels:
55			layer.Subscribe(channel, self.forward, channel)
56			self.changed(LAYERS_CHANGED, self)
57
58			def RemoveLayer(self, layer):
59			for channel in self.forwarded_channels:
60			layer.Unsubscribe(channel, self.forward, channel)
61			self.layers.remove(layer)
62			self.changed(LAYERS_CHANGED, self)
63			layer.Destroy()
64
65			def LabelLayer(self):
66			"""Return the Map's label layer"""
67			return self.label_layer
68
69			def Layers(self):
70			return self.layers
71
72			def HasLayers(self):
73			return len(self.layers) > 0
74
75			def RaiseLayer(self, layer):
76			index = self.layers.index(layer)
77			if index < len(self.layers) - 1:
78			del self.layers[index]
79			self.layers.insert(index + 1, layer)
80			self.changed(LAYERS_CHANGED, self)
81
82			def LowerLayer(self, layer):
83			index = self.layers.index(layer)
84			if index > 0:
85			del self.layers[index]
86			self.layers.insert(index - 1, layer)
87			self.changed(LAYERS_CHANGED, self)
88
89			def BoundingBox(self):
90			if not self.layers:
91			return None
92			llx = []
93			lly = []
94			urx = []
95			ury = []
96			for layer in self.layers:
97			if layer is self.label_layer:
98			continue
99			left, bottom, right, top = layer.LatLongBoundingBox()
100			llx.append(left)
101			lly.append(bottom)
102			urx.append(right)
103			ury.append(top)
104			return (min(llx), min(lly), max(urx), max(ury))
105
106			def ProjectedBoundingBox(self):
107			# This simply returns the rectangle given by the projected
108			# corners of the non-projected bbox.
109			bbox = self.BoundingBox()
110			if bbox is not None and self.projection is not None:
111			bbox = self.projection.ForwardBBox(bbox)
112			return bbox
113
114			def SetProjection(self, projection):
115			self.projection = projection
116			self.changed(MAP_PROJECTION_CHANGED, self)
117
118			def forward(self, *args):
119			"""Reissue events"""
120			if len(args) > 1:
121			args = (args[-1],) + args[:-1]
122			apply(self.issue, args)
123
124			def WasModified(self):
125			"""Return true if the map or one of the layers was modified"""
126			if self.modified:
127			return 1
128			else:
129			for layer in self.layers:
130			if layer.WasModified():
131			return 1
132			return self.label_layer.WasModified()
133
134			def UnsetModified(self):
135			"""Unset the modified flag of the map and the layers"""
136			Modifiable.UnsetModified(self)
137			for layer in self.layers:
138			layer.UnsetModified()
139			self.label_layer.UnsetModified()
140
141
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svn:keywords	Author Date Id Revision