Thuban/Model/layer.py

# Copyright (c) 2001, 2002, 2003 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
# Jonathan Coles <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

import os
import warnings

from Thuban import _

from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
     LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED

import classification

from color import Transparent, Black
from base import TitledObject, Modifiable
from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT

import resource


shapetype_names = {SHAPETYPE_POINT: "Point",
                   SHAPETYPE_ARC: "Arc",
                   SHAPETYPE_POLYGON: "Polygon"}

class BaseLayer(TitledObject, Modifiable):

    """Base class for the layers."""

    def __init__(self, title, visible = True, projection = None):
        """Initialize the layer.

        title -- the title
        visible -- boolean. If true the layer is visible.
        """
        TitledObject.__init__(self, title)
        Modifiable.__init__(self)
        self.visible = visible
        self.projection = projection

    def Visible(self):
        """Return true if layer is visible"""
        return self.visible

    def SetVisible(self, visible):
        """Set the layer's visibility."""
        self.visible = visible
        self.issue(LAYER_VISIBILITY_CHANGED, self)

    def HasClassification(self):
        """Determine if this layer support classifications."""
        return False

    def HasShapes(self):
        """Determine if this layer supports shapes."""
        return False

    def GetProjection(self):
        """Return the layer's projection."""
        return self.projection

    def SetProjection(self, projection):
        """Set the layer's projection"""
        self.projection = projection
        self.changed(LAYER_PROJECTION_CHANGED, self)

class Layer(BaseLayer):

    """Represent the information of one geodata file (currently a shapefile)

    All children of the layer have the same type.

    A layer has fill and stroke colors. Colors should be instances of
    Color. They can also be Transparent, indicating no fill or no stroke.

    The layer objects send the following events, all of which have the
    layer object as parameter:

        TITLE_CHANGED -- The title has changed.
        LAYER_PROJECTION_CHANGED -- the projection has changed.
    """

    def __init__(self, title, data, projection = None,
                 fill = Transparent, 
                 stroke = Black, 
                 lineWidth = 1, 
                 visible = True):
        """Initialize the layer.

        title -- the title
        data -- datastore object for the shape data shown by the layer
        projection -- the projection object. Its Inverse method is
               assumed to map the layer's coordinates to lat/long
               coordinates
        fill -- the fill color or Transparent if the shapes are 
                not filled
        stroke -- the stroke color or Transparent if the shapes 
                are not stroked
        visible -- boolean. If true the layer is visible.

        colors are expected to be instances of Color class
        """
        BaseLayer.__init__(self, title, 
                                 visible = visible,
                                 projection = projection)

        self.__classification = None
        self.store = None

        self.SetShapeStore(data)

        self.classification_column = None
        self.SetClassificationColumn(None)
        self.SetClassification(None)

        self.__classification.SetDefaultLineColor(stroke)
        self.__classification.SetDefaultLineWidth(lineWidth)
        self.__classification.SetDefaultFill(fill)

        self.UnsetModified()

    def SetShapeStore(self, store):
        # Set the classification to None if there is a classification
        # and the new shapestore doesn't have a table with a suitable
        # column, i.e one with the same name and type as before
        # FIXME: Maybe we should keep it the same if the type is
        # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
        if self.__classification is not None:
            columnname = self.classification_column
            columntype = self.GetFieldType(columnname)
            table = store.Table()
            if (columnname is not None
                and (not table.HasColumn(columnname)
                     or table.Column(columnname).type != columntype)):
                self.SetClassification(None)

        self.store = store

        self.changed(LAYER_SHAPESTORE_REPLACED, self)

    def ShapeStore(self):
        return self.store

    def Destroy(self):
        BaseLayer.Destroy(self)
        if self.__classification is not None:
            self.__classification.Unsubscribe(CLASS_CHANGED,
                                              self._classification_changed)

    def BoundingBox(self):
        """Return the layer's bounding box in the intrinsic coordinate system.

        If the layer has no shapes, return None.
        """
        return self.store.BoundingBox()

    def LatLongBoundingBox(self):
        """Return the layer's bounding box in lat/long coordinates.

        Return None, if the layer doesn't contain any shapes.
        """
        bbox = self.BoundingBox()
        if bbox is not None and self.projection is not None:
            bbox = self.projection.InverseBBox(bbox)
        return bbox

    def ShapesBoundingBox(self, shapes):
        """Return a bounding box in lat/long coordinates for the given
        list of shape ids.

        If shapes is None or empty, return None.
        """

        if shapes is None or len(shapes) == 0: return None

        xs = []
        ys = []

        for id in shapes:
            bbox = self.Shape(id).compute_bbox()
            if self.projection is not None:
                bbox = self.projection.InverseBBox(bbox)
            left, bottom, right, top = bbox
            xs.append(left); xs.append(right)
            ys.append(bottom); ys.append(top)

        return (min(xs), min(ys), max(xs), max(ys))


    def GetFieldType(self, fieldName):
        if self.store:
            table = self.store.Table()
            if table.HasColumn(fieldName):
                return table.Column(fieldName).type
        return None

    def HasShapes(self):
        return True

    def NumShapes(self):
        """Return the number of shapes in the layer"""
        return self.store.NumShapes()

    def ShapeType(self):
        """Return the type of the shapes in the layer.

        The return value is one of the SHAPETYPE_* constants defined in
        Thuban.Model.data.
        """
        return self.store.ShapeType()

    def Shape(self, index):
        """Return the shape with index index"""
        return self.store.Shape(index)

    def ShapesInRegion(self, bbox):
        """Return an iterable over the shapes that overlap the bounding box.

        The bbox parameter should be the bounding box as a tuple in the
        form (minx, miny, maxx, maxy) in unprojected coordinates.
        """
        if self.projection is not None:
            bbox = self.projection.ForwardBBox(bbox)
        return self.store.ShapesInRegion(bbox)

    def GetClassificationColumn(self):
        return self.classification_column

    def SetClassificationColumn(self, column):
        """Set the column to classifiy on, or None. If column is not None
        and the column does not exist in the table, raise a ValueError.
        """
        if column:
            columnType = self.GetFieldType(column)
            if columnType is None:
                raise ValueError()
        changed = self.classification_column != column
        self.classification_column = column
        if changed:
            self.changed(LAYER_CHANGED, self)

    def HasClassification(self):
        return True

    def GetClassification(self):
        return self.__classification

    def SetClassification(self, clazz):
        """Set the classification used by this layer to 'clazz'

        If 'clazz' is None a default classification is created.

        This issues a LAYER_CHANGED event.
        """

        if self.__classification is not None:
            self.__classification.Unsubscribe(CLASS_CHANGED,
                                              self._classification_changed)

        if clazz is None:
            clazz = classification.Classification()

        self.__classification = clazz
        self.__classification.Subscribe(CLASS_CHANGED,
                                        self._classification_changed)

        self._classification_changed()

    def _classification_changed(self):
        """Called from the classification object when it has changed."""
        self.changed(LAYER_CHANGED, self)
 
    def TreeInfo(self):
        items = []

        items.append(_("Filename: %s") % self.ShapeStore().FileName())

        if self.Visible():
            items.append(_("Shown"))
        else:
            items.append(_("Hidden"))
        items.append(_("Shapes: %d") % self.NumShapes())

        bbox = self.LatLongBoundingBox()
        if bbox is not None:
            items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
        else:
            items.append(_("Extent (lat-lon):"))
        items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])

        if self.projection and len(self.projection.params) > 0:
            items.append((_("Projection"),
                        [str(param) for param in self.projection.params]))

        items.append(self.__classification)

        return (_("Layer '%s'") % self.Title(), items)


if resource.has_gdal_support():
    import gdal
    from gdalconst import GA_ReadOnly

class RasterLayer(BaseLayer):

    def __init__(self, title, filename, projection = None, visible = True):
        """Initialize the Raster Layer.

        title -- title for the layer.

        filename -- file name of the source image.

        projection -- Projection object describing the projection which
                      the source image is in.

        visible -- True is the layer should initially be visible.

        Throws IOError if the filename is invalid or points to a file that
        is not in a format GDAL can use.
        """

        BaseLayer.__init__(self, title, visible = visible)

        self.projection = projection
        self.filename = os.path.abspath(filename)

        self.bbox = -1

        if resource.has_gdal_support():
            #
            # temporarily open the file so that GDAL can test if it's valid.
            #
            dataset = gdal.Open(self.filename, GA_ReadOnly)

            if dataset is None:
                raise IOError()

        self.UnsetModified()

    def BoundingBox(self):
        """Return the layer's bounding box in the intrinsic coordinate system.

        If the there is no support for images, or the file cannot
        be read, or there is no geographics information available, return None.
        """
        if not resource.has_gdal_support():
            return None

        if self.bbox == -1:
            dataset = gdal.Open(self.filename, GA_ReadOnly)
            if dataset is None:
                self.bbox = None
            else:
                geotransform = dataset.GetGeoTransform()
                if geotransform is None:
                    return None

                x = 0
                y = dataset.RasterYSize
                left = geotransform[0] +        \
                       geotransform[1] * x +    \
                       geotransform[2] * y

                bottom = geotransform[3] +      \
                         geotransform[4] * x +  \
                         geotransform[5] * y

                x = dataset.RasterXSize
                y = 0
                right = geotransform[0] +       \
                        geotransform[1] * x +   \
                        geotransform[2] * y

                top = geotransform[3] +         \
                      geotransform[4] * x +     \
                      geotransform[5] * y

                self.bbox = (left, bottom, right, top)

        return self.bbox

    def LatLongBoundingBox(self):
        bbox = self.BoundingBox()
        if bbox is None:
            return None

        if self.projection is not None:
            bbox = self.projection.InverseBBox(bbox)

        return bbox

    def GetImageFilename(self):
        return self.filename

    def TreeInfo(self):
        items = []

        items.append(_("Filename: %s") % self.GetImageFilename())

        if self.Visible():
            items.append(_("Shown"))
        else:
            items.append(_("Hidden"))

        bbox = self.LatLongBoundingBox()
        if bbox is not None:
            items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
        else:
            items.append(_("Extent (lat-lon):"))

        if self.projection and len(self.projection.params) > 0:
            items.append((_("Projection"),
                        [str(param) for param in self.projection.params]))

        return (_("Layer '%s'") % self.Title(), items)

1	bh	701	# Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2	bh	6	# Authors:
3			# Bernhard Herzog <[email protected]>
4	jonathan	412	# Jonathan Coles <[email protected]>
5	bh	6	#
6			# This program is free software under the GPL (>=v2)
7			# Read the file COPYING coming with Thuban for details.
8
9			__version__ = "$Revision$"
10
11	bh	1599	import os
12	bh	1219	import warnings
13	bh	171
14	jan	374	from Thuban import _
15	bh	6
16	bh	701	from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
17	jonathan	1427	LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
18	bh	6
19	jonathan	437	import classification
20	bh	6
21	jonathan	1338	from color import Transparent, Black
22	bh	6	from base import TitledObject, Modifiable
23	bh	1558	from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT
24	bh	6
25	jonathan	1158	import resource
26	bh	723
27	jonathan	1158
28	bh	6	shapetype_names = {SHAPETYPE_POINT: "Point",
29			SHAPETYPE_ARC: "Arc",
30			SHAPETYPE_POLYGON: "Polygon"}
31
32			class BaseLayer(TitledObject, Modifiable):
33
34			"""Base class for the layers."""
35
36	jonathan	929	def __init__(self, title, visible = True, projection = None):
37	bh	6	"""Initialize the layer.
38
39			title -- the title
40			visible -- boolean. If true the layer is visible.
41			"""
42			TitledObject.__init__(self, title)
43			Modifiable.__init__(self)
44			self.visible = visible
45	jonathan	929	self.projection = projection
46	bh	6
47			def Visible(self):
48			"""Return true if layer is visible"""
49			return self.visible
50
51			def SetVisible(self, visible):
52			"""Set the layer's visibility."""
53			self.visible = visible
54			self.issue(LAYER_VISIBILITY_CHANGED, self)
55	bh	276
56	jonathan	929	def HasClassification(self):
57			"""Determine if this layer support classifications."""
58			return False
59	bh	276
60	jonathan	1273	def HasShapes(self):
61			"""Determine if this layer supports shapes."""
62			return False
63
64	jonathan	929	def GetProjection(self):
65			"""Return the layer's projection."""
66			return self.projection
67
68			def SetProjection(self, projection):
69			"""Set the layer's projection"""
70			self.projection = projection
71			self.changed(LAYER_PROJECTION_CHANGED, self)
72
73	bh	6	class Layer(BaseLayer):
74
75			"""Represent the information of one geodata file (currently a shapefile)
76
77			All children of the layer have the same type.
78
79			A layer has fill and stroke colors. Colors should be instances of
80	jonathan	1338	Color. They can also be Transparent, indicating no fill or no stroke.
81	bh	6
82			The layer objects send the following events, all of which have the
83			layer object as parameter:
84
85			TITLE_CHANGED -- The title has changed.
86			LAYER_PROJECTION_CHANGED -- the projection has changed.
87			"""
88
89	bh	723	def __init__(self, title, data, projection = None,
90	jonathan	1338	fill = Transparent,
91			stroke = Black,
92	jonathan	464	lineWidth = 1,
93	jonathan	771	visible = True):
94	bh	6	"""Initialize the layer.
95
96			title -- the title
97	bh	723	data -- datastore object for the shape data shown by the layer
98	bh	6	projection -- the projection object. Its Inverse method is
99			assumed to map the layer's coordinates to lat/long
100			coordinates
101	jonathan	1338	fill -- the fill color or Transparent if the shapes are
102	jonathan	610	not filled
103	jonathan	1338	stroke -- the stroke color or Transparent if the shapes
104	jonathan	610	are not stroked
105	bh	6	visible -- boolean. If true the layer is visible.
106
107			colors are expected to be instances of Color class
108			"""
109	jonathan	929	BaseLayer.__init__(self, title,
110			visible = visible,
111			projection = projection)
112	bh	276
113	bh	723	self.__classification = None
114	jonathan	1427	self.store = None
115	jonathan	481
116	bh	723	self.SetShapeStore(data)
117	jonathan	492
118	bh	1452	self.classification_column = None
119			self.SetClassificationColumn(None)
120	jonathan	492	self.SetClassification(None)
121
122	jonathan	464	self.__classification.SetDefaultLineColor(stroke)
123			self.__classification.SetDefaultLineWidth(lineWidth)
124	jonathan	412	self.__classification.SetDefaultFill(fill)
125	jonathan	364
126	jonathan	389	self.UnsetModified()
127
128	bh	723	def SetShapeStore(self, store):
129	jonathan	1427	# Set the classification to None if there is a classification
130			# and the new shapestore doesn't have a table with a suitable
131			# column, i.e one with the same name and type as before
132			# FIXME: Maybe we should keep it the same if the type is
133			# compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
134			if self.__classification is not None:
135	bh	1452	columnname = self.classification_column
136			columntype = self.GetFieldType(columnname)
137	jonathan	1427	table = store.Table()
138	bh	1452	if (columnname is not None
139			and (not table.HasColumn(columnname)
140			or table.Column(columnname).type != columntype)):
141	jonathan	1427	self.SetClassification(None)
142
143	bh	723	self.store = store
144	bh	179
145	bh	1142	self.changed(LAYER_SHAPESTORE_REPLACED, self)
146	bh	723
147			def ShapeStore(self):
148			return self.store
149
150	bh	258	def Destroy(self):
151	bh	260	BaseLayer.Destroy(self)
152	jonathan	1427	if self.__classification is not None:
153	bh	1452	self.__classification.Unsubscribe(CLASS_CHANGED,
154			self._classification_changed)
155	bh	258
156	bh	6	def BoundingBox(self):
157	bh	179	"""Return the layer's bounding box in the intrinsic coordinate system.
158
159			If the layer has no shapes, return None.
160			"""
161	bh	1535	return self.store.BoundingBox()
162	bh	6
163			def LatLongBoundingBox(self):
164	bh	179	"""Return the layer's bounding box in lat/long coordinates.
165	bh	6
166	bh	179	Return None, if the layer doesn't contain any shapes.
167			"""
168			bbox = self.BoundingBox()
169	bh	1983	if bbox is not None and self.projection is not None:
170			bbox = self.projection.InverseBBox(bbox)
171			return bbox
172	bh	179
173	jonathan	828	def ShapesBoundingBox(self, shapes):
174			"""Return a bounding box in lat/long coordinates for the given
175			list of shape ids.
176
177			If shapes is None or empty, return None.
178			"""
179
180			if shapes is None or len(shapes) == 0: return None
181
182	bh	1983	xs = []
183			ys = []
184	jonathan	828
185			for id in shapes:
186	bh	1983	bbox = self.Shape(id).compute_bbox()
187			if self.projection is not None:
188			bbox = self.projection.InverseBBox(bbox)
189			left, bottom, right, top = bbox
190			xs.append(left); xs.append(right)
191			ys.append(bottom); ys.append(top)
192	jonathan	828
193	bh	1983	return (min(xs), min(ys), max(xs), max(ys))
194	jonathan	828
195
196	jonathan	464	def GetFieldType(self, fieldName):
197	jonathan	1427	if self.store:
198			table = self.store.Table()
199			if table.HasColumn(fieldName):
200			return table.Column(fieldName).type
201	bh	839	return None
202	jonathan	464
203	jonathan	1273	def HasShapes(self):
204			return True
205
206	bh	6	def NumShapes(self):
207			"""Return the number of shapes in the layer"""
208	bh	1535	return self.store.NumShapes()
209	bh	6
210			def ShapeType(self):
211			"""Return the type of the shapes in the layer.
212	bh	1535
213			The return value is one of the SHAPETYPE_* constants defined in
214			Thuban.Model.data.
215	bh	6	"""
216	bh	1535	return self.store.ShapeType()
217	bh	6
218			def Shape(self, index):
219			"""Return the shape with index index"""
220	bh	1535	return self.store.Shape(index)
221	jonathan	364
222	bh	1587	def ShapesInRegion(self, bbox):
223	bh	1593	"""Return an iterable over the shapes that overlap the bounding box.
224	bh	143
225	bh	1593	The bbox parameter should be the bounding box as a tuple in the
226			form (minx, miny, maxx, maxy) in unprojected coordinates.
227	bh	143	"""
228	jonathan	794	if self.projection is not None:
229	bh	1983	bbox = self.projection.ForwardBBox(bbox)
230	bh	1587	return self.store.ShapesInRegion(bbox)
231	bh	143
232	bh	1452	def GetClassificationColumn(self):
233			return self.classification_column
234	jonathan	1427
235	bh	1452	def SetClassificationColumn(self, column):
236			"""Set the column to classifiy on, or None. If column is not None
237			and the column does not exist in the table, raise a ValueError.
238	jonathan	1427	"""
239	bh	1452	if column:
240			columnType = self.GetFieldType(column)
241			if columnType is None:
242	jonathan	1427	raise ValueError()
243	bh	1452	changed = self.classification_column != column
244			self.classification_column = column
245			if changed:
246			self.changed(LAYER_CHANGED, self)
247	jonathan	1427
248	jonathan	929	def HasClassification(self):
249			return True
250	jonathan	725
251	jonathan	412	def GetClassification(self):
252			return self.__classification
253
254			def SetClassification(self, clazz):
255	jonathan	1338	"""Set the classification used by this layer to 'clazz'
256	jonathan	481
257	jonathan	1338	If 'clazz' is None a default classification is created.
258
259	jonathan	1427	This issues a LAYER_CHANGED event.
260	jonathan	492	"""
261	jonathan	481
262	jonathan	1427	if self.__classification is not None:
263	bh	1452	self.__classification.Unsubscribe(CLASS_CHANGED,
264			self._classification_changed)
265	jonathan	529
266	jonathan	1338	if clazz is None:
267			clazz = classification.Classification()
268	jonathan	529
269	jonathan	1427	self.__classification = clazz
270	bh	1452	self.__classification.Subscribe(CLASS_CHANGED,
271			self._classification_changed)
272	jonathan	1338
273	bh	1452	self._classification_changed()
274	jonathan	492
275	bh	1452	def _classification_changed(self):
276	jonathan	492	"""Called from the classification object when it has changed."""
277	jonathan	558	self.changed(LAYER_CHANGED, self)
278	jonathan	492
279	bh	217	def TreeInfo(self):
280			items = []
281
282	jonathan	1338	items.append(_("Filename: %s") % self.ShapeStore().FileName())
283	jan	1012
284	bh	217	if self.Visible():
285	jan	374	items.append(_("Shown"))
286	bh	217	else:
287	jan	374	items.append(_("Hidden"))
288			items.append(_("Shapes: %d") % self.NumShapes())
289	bh	217
290			bbox = self.LatLongBoundingBox()
291			if bbox is not None:
292	jan	374	items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
293	bh	217	else:
294	jan	374	items.append(_("Extent (lat-lon):"))
295			items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
296	bh	217
297	jonathan	736	if self.projection and len(self.projection.params) > 0:
298			items.append((_("Projection"),
299			[str(param) for param in self.projection.params]))
300
301	jonathan	412	items.append(self.__classification)
302	bh	217
303	jan	374	return (_("Layer '%s'") % self.Title(), items)
304	jonathan	382
305	jonathan	736
306	jonathan	1158	if resource.has_gdal_support():
307			import gdal
308			from gdalconst import GA_ReadOnly
309
310	jonathan	929	class RasterLayer(BaseLayer):
311
312			def __init__(self, title, filename, projection = None, visible = True):
313			"""Initialize the Raster Layer.
314
315			title -- title for the layer.
316
317			filename -- file name of the source image.
318
319			projection -- Projection object describing the projection which
320			the source image is in.
321
322			visible -- True is the layer should initially be visible.
323	jonathan	961
324			Throws IOError if the filename is invalid or points to a file that
325			is not in a format GDAL can use.
326	jonathan	929	"""
327
328			BaseLayer.__init__(self, title, visible = visible)
329
330			self.projection = projection
331	bh	1599	self.filename = os.path.abspath(filename)
332	jonathan	929
333			self.bbox = -1
334
335	jonathan	1158	if resource.has_gdal_support():
336			#
337			# temporarily open the file so that GDAL can test if it's valid.
338			#
339			dataset = gdal.Open(self.filename, GA_ReadOnly)
340	jonathan	961
341	jonathan	1158	if dataset is None:
342			raise IOError()
343	jonathan	961
344	jonathan	929	self.UnsetModified()
345
346			def BoundingBox(self):
347			"""Return the layer's bounding box in the intrinsic coordinate system.
348
349	jonathan	1338	If the there is no support for images, or the file cannot
350			be read, or there is no geographics information available, return None.
351	jonathan	929	"""
352	jonathan	1158	if not resource.has_gdal_support():
353			return None
354
355	jonathan	929	if self.bbox == -1:
356			dataset = gdal.Open(self.filename, GA_ReadOnly)
357			if dataset is None:
358			self.bbox = None
359			else:
360	jonathan	961	geotransform = dataset.GetGeoTransform()
361			if geotransform is None:
362			return None
363
364			x = 0
365			y = dataset.RasterYSize
366			left = geotransform[0] + \
367			geotransform[1] * x + \
368			geotransform[2] * y
369
370			bottom = geotransform[3] + \
371			geotransform[4] * x + \
372			geotransform[5] * y
373
374			x = dataset.RasterXSize
375			y = 0
376			right = geotransform[0] + \
377			geotransform[1] * x + \
378			geotransform[2] * y
379
380			top = geotransform[3] + \
381			geotransform[4] * x + \
382			geotransform[5] * y
383
384	jonathan	929	self.bbox = (left, bottom, right, top)
385
386			return self.bbox
387
388			def LatLongBoundingBox(self):
389			bbox = self.BoundingBox()
390	jonathan	961	if bbox is None:
391	jonathan	929	return None
392
393	jonathan	961	if self.projection is not None:
394	bh	1983	bbox = self.projection.InverseBBox(bbox)
395	jonathan	961
396	bh	1983	return bbox
397	jonathan	961
398	jonathan	929	def GetImageFilename(self):
399			return self.filename
400
401			def TreeInfo(self):
402			items = []
403
404	jonathan	1338	items.append(_("Filename: %s") % self.GetImageFilename())
405
406	jonathan	929	if self.Visible():
407			items.append(_("Shown"))
408			else:
409			items.append(_("Hidden"))
410
411			bbox = self.LatLongBoundingBox()
412			if bbox is not None:
413			items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
414			else:
415			items.append(_("Extent (lat-lon):"))
416
417			if self.projection and len(self.projection.params) > 0:
418			items.append((_("Projection"),
419			[str(param) for param in self.projection.params]))
420
421			return (_("Layer '%s'") % self.Title(), items)
422
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