/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 389 by jonathan, Mon Feb 10 15:25:30 2003 UTC revision 1012 by jan, Fri May 23 09:13:58 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Jonathan Coles <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
 import os  
11  from math import log, ceil  from math import log, ceil
12    
13  from Thuban import _  from Thuban import _
14    
15  import shapelib, shptree  import shapelib, shptree
16    
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  import gdal
18       LAYER_VISIBILITY_CHANGED  from gdalconst import GA_ReadOnly
19    
20  from color import Color  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
21  # Some predefined colors for internal use       LAYER_CHANGED
 _black = Color(0, 0, 0)  
22    
23  from classification import Classification  from color import Color
24    
25  from table import Table  import classification
26    
27  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
28    
29    
30  class Shape:  class Shape:
31    
32      """Represent one shape"""      """Represent one shape"""
# Line 34  class Shape: Line 34  class Shape:
34      def __init__(self, points):      def __init__(self, points):
35          self.points = points          self.points = points
36          #self.compute_bbox()          #self.compute_bbox()
37            self.bbox = None
38    
39      def compute_bbox(self):      def compute_bbox(self):
40            if self.bbox is not None:
41                return self.bbox
42    
43          xs = []          xs = []
44          ys = []          ys = []
45          for x, y in self.points:          for x, y in self.points:
# Line 46  class Shape: Line 50  class Shape:
50          self.urx = max(xs)          self.urx = max(xs)
51          self.ury = max(ys)          self.ury = max(ys)
52    
53            self.bbox = (self.llx, self.lly, self.urx, self.ury)
54    
55            return self.bbox
56    
57      def Points(self):      def Points(self):
58          return self.points          return self.points
59    
# Line 69  class BaseLayer(TitledObject, Modifiable Line 77  class BaseLayer(TitledObject, Modifiable
77    
78      """Base class for the layers."""      """Base class for the layers."""
79    
80      def __init__(self, title, visible = 1):      def __init__(self, title, visible = True, projection = None):
81          """Initialize the layer.          """Initialize the layer.
82    
83          title -- the title          title -- the title
# Line 78  class BaseLayer(TitledObject, Modifiable Line 86  class BaseLayer(TitledObject, Modifiable
86          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
87          Modifiable.__init__(self)          Modifiable.__init__(self)
88          self.visible = visible          self.visible = visible
89            self.projection = projection
90    
91      def Visible(self):      def Visible(self):
92          """Return true if layer is visible"""          """Return true if layer is visible"""
# Line 88  class BaseLayer(TitledObject, Modifiable Line 97  class BaseLayer(TitledObject, Modifiable
97          self.visible = visible          self.visible = visible
98          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
99    
100        def HasClassification(self):
101            """Determine if this layer support classifications."""
102            return False
103    
104        def GetProjection(self):
105            """Return the layer's projection."""
106            return self.projection
107    
108        def SetProjection(self, projection):
109            """Set the layer's projection"""
110            self.projection = projection
111            self.changed(LAYER_PROJECTION_CHANGED, self)
112    
113  class Layer(BaseLayer):  class Layer(BaseLayer):
114    
# Line 103  class Layer(BaseLayer): Line 124  class Layer(BaseLayer):
124    
125          TITLE_CHANGED -- The title has changed.          TITLE_CHANGED -- The title has changed.
126          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
         LAYER_LEGEND_CHANGED -- the fill or stroke attributes have changed  
   
127      """      """
128    
129      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
130                   fill = None, stroke = _black, stroke_width = 1, visible = 1):                   fill = Color.Transparent,
131                     stroke = Color.Black,
132                     lineWidth = 1,
133                     visible = True):
134          """Initialize the layer.          """Initialize the layer.
135    
136          title -- the title          title -- the title
137          filename -- the name of the shapefile          data -- datastore object for the shape data shown by the layer
138          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
139                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
140                 coordinates                 coordinates
141          fill -- the fill color or None if the shapes are not filled          fill -- the fill color or Color.Transparent if the shapes are
142          stroke -- the stroke color or None if the shapes are not stroked                  not filled
143            stroke -- the stroke color or Color.Transparent if the shapes
144                    are not stroked
145          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
146    
147          colors are expected to be instances of Color class          colors are expected to be instances of Color class
148          """          """
149          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title,
150                                     visible = visible,
151                                     projection = projection)
152    
153            #
154            # this is really important so that when the classification class
155            # tries to set its parent layer the variable will exist
156            #
157            self.__classification = None
158            self.__setClassLock = False
159    
160            self.SetShapeStore(data)
161    
162            self.SetClassification(None)
163    
164            self.__classification.SetDefaultLineColor(stroke)
165            self.__classification.SetDefaultLineWidth(lineWidth)
166            self.__classification.SetDefaultFill(fill)
167            self.__classification.SetLayer(self)
168    
169          # Make the filename absolute. The filename will be          self.UnsetModified()
         # interpreted relative to that anyway, but when saving a  
         # session we need to compare absolute paths and it's usually  
         # safer to always work with absolute paths.  
         self.filename = os.path.abspath(filename)  
170    
         self.projection = projection  
         self.fill = fill  
         self.stroke = stroke  
         self.stroke_width = stroke_width  
         self.shapefile = None  
         self.shapetree = None  
         self.open_shapefile()  
         # shapetable is the table associated with the shapefile, while  
         # table is the default table used to look up attributes for  
         # display  
         self.shapetable = Table(filename)  
         self.table = self.shapetable  
171    
172          self.classification = Classification(self)      def SetShapeStore(self, store):
173          self.classification.SetDefaultStroke(stroke)          self.store = store
174          self.classification.SetDefaultStrokeWidth(stroke_width)          self.shapefile = self.store.Shapefile()
175          self.classification.SetDefaultFill(fill)          self.shapetable = self.store.Table()
176            if hasattr(self.store, "FileName"):
177                self.filename = self.store.FileName()
178            self.table = self.shapetable
179    
180          self.UnsetModified()          numshapes, shapetype, mins, maxs = self.shapefile.info()
181            self.numshapes = numshapes
182            self.shapetype = shapelib_shapetypes[shapetype]
183    
184            # if there are shapes, set the bbox accordingly. Otherwise
185            # set it to None.
186            if self.numshapes:
187                self.bbox = mins[:2] + maxs[:2]
188            else:
189                self.bbox = None
190    
191      def open_shapefile(self):          # estimate a good depth for the quad tree. Each depth
192          if self.shapefile is None:          # multiplies the number of nodes by four, therefore we
193              self.shapefile = shapelib.ShapeFile(self.filename)          # basically take the base 4 logarithm of the number of
194              numshapes, shapetype, mins, maxs = self.shapefile.info()          # shapes.
195              self.numshapes = numshapes          if self.numshapes < 4:
196              self.shapetype = shapelib_shapetypes[shapetype]              maxdepth = 1
197            else:
198              # if there are shapes, set the bbox accordinly. Otherwise              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
             # set it to None.  
             if self.numshapes:  
                 self.bbox = mins[:2] + maxs[:2]  
             else:  
                 self.bbox = None  
199    
200              # estimate a good depth for the quad tree. Each depth          self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
201              # multiplies the number of nodes by four, therefore we                                           maxdepth)
202              # basically take the base 4 logarithm of the number of          if self.__classification is not None:
203              # shapes.              fieldname = self.__classification.GetField()
204              if self.numshapes < 4:              if fieldname is not None and \
205                  maxdepth = 1                 not self.store.Table().HasColumn(fieldname):
206              else:                  self.SetClassification(None)
207                  maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))          self.changed(LAYER_CHANGED, self)
208    
209              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,      def ShapeStore(self):
210                                               maxdepth)          return self.store
211    
212      def Destroy(self):      def Destroy(self):
213          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
214          if self.shapefile is not None:          self.SetClassification(None)
             self.shapefile.close()  
             self.shapefile = None  
             self.shapetree = None  
         self.table.Destroy()  
215    
216      def BoundingBox(self):      def BoundingBox(self):
217          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
218    
219          If the layer has no shapes, return None.          If the layer has no shapes, return None.
220          """          """
         # The bbox will be set by open_shapefile just as we need it  
         # here.  
         self.open_shapefile()  
221          return self.bbox          return self.bbox
222    
223      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
# Line 209  class Layer(BaseLayer): Line 235  class Layer(BaseLayer):
235          else:          else:
236              return None              return None
237    
238        def ShapesBoundingBox(self, shapes):
239            """Return a bounding box in lat/long coordinates for the given
240            list of shape ids.
241    
242            If shapes is None or empty, return None.
243            """
244    
245            if shapes is None or len(shapes) == 0: return None
246    
247            llx = []
248            lly = []
249            urx = []
250            ury = []
251    
252            if self.projection is not None:
253                inverse = lambda x, y: self.projection.Inverse(x, y)
254            else:
255                inverse = lambda x, y: (x, y)
256    
257            for id in shapes:
258                left, bottom, right, top = self.Shape(id).compute_bbox()
259    
260                left, bottom = inverse(left, bottom)
261                right, top   = inverse(right, top)
262    
263                llx.append(left)
264                lly.append(bottom)
265                urx.append(right)
266                ury.append(top)
267    
268            return (min(llx), min(lly), max(urx), max(ury))
269    
270        def GetFieldType(self, fieldName):
271            if self.table.HasColumn(fieldName):
272                return self.table.Column(fieldName).type
273            return None
274    
275      def NumShapes(self):      def NumShapes(self):
276          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
277          return self.numshapes          return self.numshapes
278    
279      def ShapeType(self):      def ShapeType(self):
280          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
281          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
282          """          """
         self.open_shapefile()  
283          return self.shapetype          return self.shapetype
284    
285      def Shape(self, index):      def Shape(self, index):
286          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
287          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
288    
289          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
# Line 240  class Layer(BaseLayer): Line 300  class Layer(BaseLayer):
300      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
301          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
302    
303          Box is a tuple (left, bottom, right, top) in the coordinate          Box is a tuple (left, bottom, right, top) in unprojected coordinates.
         system used by the layer's shapefile.  
304          """          """
305          left, bottom, right, top = box          left, bottom, right, top = box
306    
307            if self.projection is not None:
308                left,  bottom = self.projection.Forward(left, bottom)
309                right, top    = self.projection.Forward(right, top)
310    
311          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
312    
313      def SetProjection(self, projection):      def HasClassification(self):
314          """Set the layer's projection"""          return True
         self.projection = projection  
         self.changed(LAYER_PROJECTION_CHANGED, self)  
315    
316        def GetClassification(self):
317            return self.__classification
318    
319        def SetClassification(self, clazz):
320            """Set the classification to 'clazz'
321    
322            If 'clazz' is None a default classification is created
323            """
324    
325            # prevent infinite recursion when calling SetLayer()
326            if self.__setClassLock: return
327    
328            self.__setClassLock = True
329    
330            if clazz is None:
331                if self.__classification is not None:
332                    self.__classification.SetLayer(None)
333                self.__classification = classification.Classification()
334            else:
335                self.__classification = clazz
336                try:
337                    self.__classification.SetLayer(self)
338                except ValueError:
339                    self.__setClassLock = False
340                    raise ValueError
341    
342            self.changed(LAYER_CHANGED, self)
343    
344            self.__setClassLock = False
345    
346        def ClassChanged(self):
347            """Called from the classification object when it has changed."""
348            self.changed(LAYER_CHANGED, self)
349    
350      def TreeInfo(self):      def TreeInfo(self):
351          items = []          items = []
352    
353            items.append(_("Filename: %s") % self.filename)
354    
355          if self.Visible():          if self.Visible():
356              items.append(_("Shown"))              items.append(_("Shown"))
357          else:          else:
# Line 267  class Layer(BaseLayer): Line 365  class Layer(BaseLayer):
365              items.append(_("Extent (lat-lon):"))              items.append(_("Extent (lat-lon):"))
366          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
367    
368          def color_string(color):          if self.projection and len(self.projection.params) > 0:
369              if color is None:              items.append((_("Projection"),
370                  return "None"                          [str(param) for param in self.projection.params]))
             return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue)  
371    
372          # layers will always have a classification with at least a NULL data set          items.append(self.__classification)
373    
374          #items.append((_("Fill: %s") % color_string(self.fill), self.fill))          return (_("Layer '%s'") % self.Title(), items)
375          #items.append((_("Outline: %s") % color_string(self.stroke), self.stroke))  
376    
377    class RasterLayer(BaseLayer):
378    
379        def __init__(self, title, filename, projection = None, visible = True):
380            """Initialize the Raster Layer.
381    
382            title -- title for the layer.
383    
384            filename -- file name of the source image.
385    
386            projection -- Projection object describing the projection which
387                          the source image is in.
388    
389            visible -- True is the layer should initially be visible.
390    
391            Throws IOError if the filename is invalid or points to a file that
392            is not in a format GDAL can use.
393            """
394    
395            BaseLayer.__init__(self, title, visible = visible)
396    
397            self.projection = projection
398            self.filename = filename
399    
400            self.bbox = -1
401    
402            #
403            # temporarily open the file so that GDAL can test if it's valid.
404            #
405            dataset = gdal.Open(self.filename, GA_ReadOnly)
406    
407            if dataset is None:
408                raise IOError()
409    
410            self.UnsetModified()
411    
412        def BoundingBox(self):
413            """Return the layer's bounding box in the intrinsic coordinate system.
414    
415            If the layer has no shapes, return None.
416            """
417            if self.bbox == -1:
418                dataset = gdal.Open(self.filename, GA_ReadOnly)
419                if dataset is None:
420                    self.bbox = None
421                else:
422                    geotransform = dataset.GetGeoTransform()
423                    if geotransform is None:
424                        return None
425    
426                    x = 0
427                    y = dataset.RasterYSize
428                    left = geotransform[0] +        \
429                           geotransform[1] * x +    \
430                           geotransform[2] * y
431    
432                    bottom = geotransform[3] +      \
433                             geotransform[4] * x +  \
434                             geotransform[5] * y
435    
436                    x = dataset.RasterXSize
437                    y = 0
438                    right = geotransform[0] +       \
439                            geotransform[1] * x +   \
440                            geotransform[2] * y
441    
442                    top = geotransform[3] +         \
443                          geotransform[4] * x +     \
444                          geotransform[5] * y
445    
446                    self.bbox = (left, bottom, right, top)
447    
448            return self.bbox
449    
450        def LatLongBoundingBox(self):
451            bbox = self.BoundingBox()
452            if bbox is None:
453                return None
454    
455            llx, lly, urx, ury = bbox
456            if self.projection is not None:
457                llx, lly = self.projection.Inverse(llx, lly)
458                urx, ury = self.projection.Inverse(urx, ury)
459    
460            return llx, lly, urx, ury
461    
462        def GetImageFilename(self):
463            return self.filename
464    
465        def TreeInfo(self):
466            items = []
467    
468            if self.Visible():
469                items.append(_("Shown"))
470            else:
471                items.append(_("Hidden"))
472            items.append(_("Shapes: %d") % self.NumShapes())
473    
474            bbox = self.LatLongBoundingBox()
475            if bbox is not None:
476                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
477            else:
478                items.append(_("Extent (lat-lon):"))
479    
480          items.append(self.classification)          if self.projection and len(self.projection.params) > 0:
481                items.append((_("Projection"),
482                            [str(param) for param in self.projection.params]))
483    
484          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
485    
Legend:
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changed lines
  Added in v.1012
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