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 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 __getattr__(self, attr):
        """Access to some attributes for backwards compatibility

        The attributes implemented here are now held by the shapestore
        if at all. For backwards compatibility pretend that they are
        still there but issue a DeprecationWarning when they are
        accessed.
        """
        if attr in ("table", "shapetable"):
            value = self.store.Table()
        elif attr == "shapefile":
            value = self.store.Shapefile()
        elif attr == "filename":
            value = self.store.FileName()
        else:
            raise AttributeError, attr
        warnings.warn("The Layer attribute %r is deprecated."
                      " It's value can be accessed through the shapestore"
                      % attr, DeprecationWarning, stacklevel = 2)
        return value

    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:
            llx, lly, urx, ury = bbox
            if self.projection is not None:
                llx, lly = self.projection.Inverse(llx, lly)
                urx, ury = self.projection.Inverse(urx, ury)
            return llx, lly, urx, ury
        else:
            return None

    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

        llx = []
        lly = []
        urx = []
        ury = []

        if self.projection is not None:
            inverse = lambda x, y: self.projection.Inverse(x, y)
        else:
            inverse = lambda x, y: (x, y)

        for id in shapes:
            left, bottom, right, top = self.Shape(id).compute_bbox()

            left, bottom = inverse(left, bottom)
            right, top   = inverse(right, top)

            llx.append(left)
            lly.append(bottom)
            urx.append(right)
            ury.append(top)

        return (min(llx), min(lly), max(urx), max(ury))

    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 the ids of the shapes that overlap the box.

        Box is a tuple (left, bottom, right, top) in unprojected coordinates.
        """
        if self.projection is not None:
            left, bottom, right, top = bbox
            xs = []; ys = []
            for x, y in [(left, bottom), (left, top), (right, top),
                         (right, bottom)]:
                x, y = self.projection.Forward(x, y)
                xs.append(x)
                ys.append(y)
            bbox = (min(xs), min(ys), max(xs), max(ys))

        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 = 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

        llx, lly, urx, ury = bbox
        if self.projection is not None:
            llx, lly = self.projection.Inverse(llx, lly)
            urx, ury = self.projection.Inverse(urx, ury)

        return llx, lly, urx, ury

    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	# Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2	# Authors:
3	# Bernhard Herzog <[email protected]>
4	# Jonathan Coles <[email protected]>
5	#
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	import warnings
12
13	from Thuban import _
14
15	from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
16	LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
17
18	import classification
19
20	from color import Transparent, Black
21	from base import TitledObject, Modifiable
22	from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT
23
24	import resource
25
26
27	shapetype_names = {SHAPETYPE_POINT: "Point",
28	SHAPETYPE_ARC: "Arc",
29	SHAPETYPE_POLYGON: "Polygon"}
30
31	class BaseLayer(TitledObject, Modifiable):
32
33	"""Base class for the layers."""
34
35	def __init__(self, title, visible = True, projection = None):
36	"""Initialize the layer.
37
38	title -- the title
39	visible -- boolean. If true the layer is visible.
40	"""
41	TitledObject.__init__(self, title)
42	Modifiable.__init__(self)
43	self.visible = visible
44	self.projection = projection
45
46	def Visible(self):
47	"""Return true if layer is visible"""
48	return self.visible
49
50	def SetVisible(self, visible):
51	"""Set the layer's visibility."""
52	self.visible = visible
53	self.issue(LAYER_VISIBILITY_CHANGED, self)
54
55	def HasClassification(self):
56	"""Determine if this layer support classifications."""
57	return False
58
59	def HasShapes(self):
60	"""Determine if this layer supports shapes."""
61	return False
62
63	def GetProjection(self):
64	"""Return the layer's projection."""
65	return self.projection
66
67	def SetProjection(self, projection):
68	"""Set the layer's projection"""
69	self.projection = projection
70	self.changed(LAYER_PROJECTION_CHANGED, self)
71
72	class Layer(BaseLayer):
73
74	"""Represent the information of one geodata file (currently a shapefile)
75
76	All children of the layer have the same type.
77
78	A layer has fill and stroke colors. Colors should be instances of
79	Color. They can also be Transparent, indicating no fill or no stroke.
80
81	The layer objects send the following events, all of which have the
82	layer object as parameter:
83
84	TITLE_CHANGED -- The title has changed.
85	LAYER_PROJECTION_CHANGED -- the projection has changed.
86	"""
87
88	def __init__(self, title, data, projection = None,
89	fill = Transparent,
90	stroke = Black,
91	lineWidth = 1,
92	visible = True):
93	"""Initialize the layer.
94
95	title -- the title
96	data -- datastore object for the shape data shown by the layer
97	projection -- the projection object. Its Inverse method is
98	assumed to map the layer's coordinates to lat/long
99	coordinates
100	fill -- the fill color or Transparent if the shapes are
101	not filled
102	stroke -- the stroke color or Transparent if the shapes
103	are not stroked
104	visible -- boolean. If true the layer is visible.
105
106	colors are expected to be instances of Color class
107	"""
108	BaseLayer.__init__(self, title,
109	visible = visible,
110	projection = projection)
111
112	self.__classification = None
113	self.store = None
114
115	self.SetShapeStore(data)
116
117	self.classification_column = None
118	self.SetClassificationColumn(None)
119	self.SetClassification(None)
120
121	self.__classification.SetDefaultLineColor(stroke)
122	self.__classification.SetDefaultLineWidth(lineWidth)
123	self.__classification.SetDefaultFill(fill)
124
125	self.UnsetModified()
126
127	def __getattr__(self, attr):
128	"""Access to some attributes for backwards compatibility
129
130	The attributes implemented here are now held by the shapestore
131	if at all. For backwards compatibility pretend that they are
132	still there but issue a DeprecationWarning when they are
133	accessed.
134	"""
135	if attr in ("table", "shapetable"):
136	value = self.store.Table()
137	elif attr == "shapefile":
138	value = self.store.Shapefile()
139	elif attr == "filename":
140	value = self.store.FileName()
141	else:
142	raise AttributeError, attr
143	warnings.warn("The Layer attribute %r is deprecated."
144	" It's value can be accessed through the shapestore"
145	% attr, DeprecationWarning, stacklevel = 2)
146	return value
147
148	def SetShapeStore(self, store):
149	# Set the classification to None if there is a classification
150	# and the new shapestore doesn't have a table with a suitable
151	# column, i.e one with the same name and type as before
152	# FIXME: Maybe we should keep it the same if the type is
153	# compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
154	if self.__classification is not None:
155	columnname = self.classification_column
156	columntype = self.GetFieldType(columnname)
157	table = store.Table()
158	if (columnname is not None
159	and (not table.HasColumn(columnname)
160	or table.Column(columnname).type != columntype)):
161	self.SetClassification(None)
162
163	self.store = store
164
165	self.changed(LAYER_SHAPESTORE_REPLACED, self)
166
167	def ShapeStore(self):
168	return self.store
169
170	def Destroy(self):
171	BaseLayer.Destroy(self)
172	if self.__classification is not None:
173	self.__classification.Unsubscribe(CLASS_CHANGED,
174	self._classification_changed)
175
176	def BoundingBox(self):
177	"""Return the layer's bounding box in the intrinsic coordinate system.
178
179	If the layer has no shapes, return None.
180	"""
181	return self.store.BoundingBox()
182
183	def LatLongBoundingBox(self):
184	"""Return the layer's bounding box in lat/long coordinates.
185
186	Return None, if the layer doesn't contain any shapes.
187	"""
188	bbox = self.BoundingBox()
189	if bbox is not None:
190	llx, lly, urx, ury = bbox
191	if self.projection is not None:
192	llx, lly = self.projection.Inverse(llx, lly)
193	urx, ury = self.projection.Inverse(urx, ury)
194	return llx, lly, urx, ury
195	else:
196	return None
197
198	def ShapesBoundingBox(self, shapes):
199	"""Return a bounding box in lat/long coordinates for the given
200	list of shape ids.
201
202	If shapes is None or empty, return None.
203	"""
204
205	if shapes is None or len(shapes) == 0: return None
206
207	llx = []
208	lly = []
209	urx = []
210	ury = []
211
212	if self.projection is not None:
213	inverse = lambda x, y: self.projection.Inverse(x, y)
214	else:
215	inverse = lambda x, y: (x, y)
216
217	for id in shapes:
218	left, bottom, right, top = self.Shape(id).compute_bbox()
219
220	left, bottom = inverse(left, bottom)
221	right, top = inverse(right, top)
222
223	llx.append(left)
224	lly.append(bottom)
225	urx.append(right)
226	ury.append(top)
227
228	return (min(llx), min(lly), max(urx), max(ury))
229
230	def GetFieldType(self, fieldName):
231	if self.store:
232	table = self.store.Table()
233	if table.HasColumn(fieldName):
234	return table.Column(fieldName).type
235	return None
236
237	def HasShapes(self):
238	return True
239
240	def NumShapes(self):
241	"""Return the number of shapes in the layer"""
242	return self.store.NumShapes()
243
244	def ShapeType(self):
245	"""Return the type of the shapes in the layer.
246
247	The return value is one of the SHAPETYPE_* constants defined in
248	Thuban.Model.data.
249	"""
250	return self.store.ShapeType()
251
252	def Shape(self, index):
253	"""Return the shape with index index"""
254	return self.store.Shape(index)
255
256	def ShapesInRegion(self, bbox):
257	"""Return the ids of the shapes that overlap the box.
258
259	Box is a tuple (left, bottom, right, top) in unprojected coordinates.
260	"""
261	if self.projection is not None:
262	left, bottom, right, top = bbox
263	xs = []; ys = []
264	for x, y in [(left, bottom), (left, top), (right, top),
265	(right, bottom)]:
266	x, y = self.projection.Forward(x, y)
267	xs.append(x)
268	ys.append(y)
269	bbox = (min(xs), min(ys), max(xs), max(ys))
270
271	return self.store.ShapesInRegion(bbox)
272
273	def GetClassificationColumn(self):
274	return self.classification_column
275
276	def SetClassificationColumn(self, column):
277	"""Set the column to classifiy on, or None. If column is not None
278	and the column does not exist in the table, raise a ValueError.
279	"""
280	if column:
281	columnType = self.GetFieldType(column)
282	if columnType is None:
283	raise ValueError()
284	changed = self.classification_column != column
285	self.classification_column = column
286	if changed:
287	self.changed(LAYER_CHANGED, self)
288
289	def HasClassification(self):
290	return True
291
292	def GetClassification(self):
293	return self.__classification
294
295	def SetClassification(self, clazz):
296	"""Set the classification used by this layer to 'clazz'
297
298	If 'clazz' is None a default classification is created.
299
300	This issues a LAYER_CHANGED event.
301	"""
302
303	if self.__classification is not None:
304	self.__classification.Unsubscribe(CLASS_CHANGED,
305	self._classification_changed)
306
307	if clazz is None:
308	clazz = classification.Classification()
309
310	self.__classification = clazz
311	self.__classification.Subscribe(CLASS_CHANGED,
312	self._classification_changed)
313
314	self._classification_changed()
315
316	def _classification_changed(self):
317	"""Called from the classification object when it has changed."""
318	self.changed(LAYER_CHANGED, self)
319
320	def TreeInfo(self):
321	items = []
322
323	items.append(_("Filename: %s") % self.ShapeStore().FileName())
324
325	if self.Visible():
326	items.append(_("Shown"))
327	else:
328	items.append(_("Hidden"))
329	items.append(_("Shapes: %d") % self.NumShapes())
330
331	bbox = self.LatLongBoundingBox()
332	if bbox is not None:
333	items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
334	else:
335	items.append(_("Extent (lat-lon):"))
336	items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
337
338	if self.projection and len(self.projection.params) > 0:
339	items.append((_("Projection"),
340	[str(param) for param in self.projection.params]))
341
342	items.append(self.__classification)
343
344	return (_("Layer '%s'") % self.Title(), items)
345
346
347	if resource.has_gdal_support():
348	import gdal
349	from gdalconst import GA_ReadOnly
350
351	class RasterLayer(BaseLayer):
352
353	def __init__(self, title, filename, projection = None, visible = True):
354	"""Initialize the Raster Layer.
355
356	title -- title for the layer.
357
358	filename -- file name of the source image.
359
360	projection -- Projection object describing the projection which
361	the source image is in.
362
363	visible -- True is the layer should initially be visible.
364
365	Throws IOError if the filename is invalid or points to a file that
366	is not in a format GDAL can use.
367	"""
368
369	BaseLayer.__init__(self, title, visible = visible)
370
371	self.projection = projection
372	self.filename = filename
373
374	self.bbox = -1
375
376	if resource.has_gdal_support():
377	#
378	# temporarily open the file so that GDAL can test if it's valid.
379	#
380	dataset = gdal.Open(self.filename, GA_ReadOnly)
381
382	if dataset is None:
383	raise IOError()
384
385	self.UnsetModified()
386
387	def BoundingBox(self):
388	"""Return the layer's bounding box in the intrinsic coordinate system.
389
390	If the there is no support for images, or the file cannot
391	be read, or there is no geographics information available, return None.
392	"""
393	if not resource.has_gdal_support():
394	return None
395
396	if self.bbox == -1:
397	dataset = gdal.Open(self.filename, GA_ReadOnly)
398	if dataset is None:
399	self.bbox = None
400	else:
401	geotransform = dataset.GetGeoTransform()
402	if geotransform is None:
403	return None
404
405	x = 0
406	y = dataset.RasterYSize
407	left = geotransform[0] + \
408	geotransform[1] * x + \
409	geotransform[2] * y
410
411	bottom = geotransform[3] + \
412	geotransform[4] * x + \
413	geotransform[5] * y
414
415	x = dataset.RasterXSize
416	y = 0
417	right = geotransform[0] + \
418	geotransform[1] * x + \
419	geotransform[2] * y
420
421	top = geotransform[3] + \
422	geotransform[4] * x + \
423	geotransform[5] * y
424
425	self.bbox = (left, bottom, right, top)
426
427	return self.bbox
428
429	def LatLongBoundingBox(self):
430	bbox = self.BoundingBox()
431	if bbox is None:
432	return None
433
434	llx, lly, urx, ury = bbox
435	if self.projection is not None:
436	llx, lly = self.projection.Inverse(llx, lly)
437	urx, ury = self.projection.Inverse(urx, ury)
438
439	return llx, lly, urx, ury
440
441	def GetImageFilename(self):
442	return self.filename
443
444	def TreeInfo(self):
445	items = []
446
447	items.append(_("Filename: %s") % self.GetImageFilename())
448
449	if self.Visible():
450	items.append(_("Shown"))
451	else:
452	items.append(_("Hidden"))
453
454	bbox = self.LatLongBoundingBox()
455	if bbox is not None:
456	items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
457	else:
458	items.append(_("Extent (lat-lon):"))
459
460	if self.projection and len(self.projection.params) > 0:
461	items.append((_("Projection"),
462	[str(param) for param in self.projection.params]))
463
464	return (_("Layer '%s'") % self.Title(), items)
465
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svn:keywords	Author Date Id Revision