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# Copyright (c) 2001, 2002, 2003, 2004, 2005 by Intevation GmbH |
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# Authors: |
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# Bernhard Herzog <[email protected]> |
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# Jonathan Coles <[email protected]> |
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# Silke Reimer <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with Thuban for details. |
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|
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__version__ = "$Revision$" |
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|
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import os |
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import warnings |
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|
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from wxproj import point_in_polygon_shape, shape_centroid |
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|
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from Thuban import _ |
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|
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from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \ |
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LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED |
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|
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import classification |
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|
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from color import Transparent, Black |
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from base import TitledObject, Modifiable |
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from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT |
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from label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \ |
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ALIGN_LEFT, ALIGN_RIGHT |
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|
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import resource |
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|
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from color import Color |
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|
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shapetype_names = {SHAPETYPE_POINT: "Point", |
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SHAPETYPE_ARC: "Arc", |
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SHAPETYPE_POLYGON: "Polygon"} |
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|
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class BaseLayer(TitledObject, Modifiable): |
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|
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"""Base class for the layers.""" |
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|
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def __init__(self, title, visible = True, projection = None): |
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"""Initialize the layer. |
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|
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title -- the title |
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visible -- boolean. If true the layer is visible. |
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""" |
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TitledObject.__init__(self, title) |
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Modifiable.__init__(self) |
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self.visible = visible |
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self.projection = projection |
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|
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def Visible(self): |
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"""Return true if layer is visible""" |
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return self.visible |
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|
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def SetVisible(self, visible): |
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"""Set the layer's visibility.""" |
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self.visible = visible |
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self.issue(LAYER_VISIBILITY_CHANGED, self) |
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|
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def HasClassification(self): |
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"""Determine if this layer supports classifications.""" |
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return False |
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|
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def HasShapes(self): |
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"""Determine if this layer supports shapes.""" |
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return False |
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|
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def GetProjection(self): |
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"""Return the layer's projection.""" |
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return self.projection |
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|
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def SetProjection(self, projection): |
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"""Set the layer's projection.""" |
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self.projection = projection |
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self.changed(LAYER_PROJECTION_CHANGED, self) |
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|
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def Type(self): |
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return "Unknown" |
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|
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class Layer(BaseLayer): |
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|
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"""Represent the information of one geodata file (currently a shapefile) |
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|
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All children of the layer have the same type. |
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|
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A layer has fill and stroke colors. Colors should be instances of |
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Color. They can also be Transparent, indicating no fill or no stroke. |
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|
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The layer objects send the following events, all of which have the |
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layer object as parameter: |
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|
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TITLE_CHANGED -- The title has changed. |
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LAYER_PROJECTION_CHANGED -- the projection has changed. |
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""" |
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|
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def __init__(self, title, data, projection = None, |
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fill = Transparent, |
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stroke = Black, |
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lineWidth = 1, |
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visible = True): |
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"""Initialize the layer. |
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|
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title -- the title |
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data -- datastore object for the shape data shown by the layer |
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projection -- the projection object. Its Inverse method is |
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assumed to map the layer's coordinates to lat/long |
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coordinates |
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fill -- the fill color or Transparent if the shapes are |
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not filled |
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stroke -- the stroke color or Transparent if the shapes |
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are not stroked |
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visible -- boolean. If true the layer is visible. |
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|
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colors are expected to be instances of Color class |
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""" |
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BaseLayer.__init__(self, title, |
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visible = visible, |
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projection = projection) |
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|
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self.__classification = None |
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self.store = None |
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|
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self.SetShapeStore(data) |
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|
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self.classification_column = None |
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self.SetClassificationColumn(None) |
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self.SetClassification(None) |
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|
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self.__classification.SetDefaultLineColor(stroke) |
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self.__classification.SetDefaultLineWidth(lineWidth) |
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self.__classification.SetDefaultFill(fill) |
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|
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self.UnsetModified() |
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|
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def SetShapeStore(self, store): |
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# Set the classification to None if there is a classification |
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# and the new shapestore doesn't have a table with a suitable |
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# column, i.e one with the same name and type as before |
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# FIXME: Maybe we should keep it the same if the type is |
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# compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT |
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if self.__classification is not None: |
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columnname = self.classification_column |
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columntype = self.GetFieldType(columnname) |
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table = store.Table() |
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if (columnname is not None |
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and (not table.HasColumn(columnname) |
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or table.Column(columnname).type != columntype)): |
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self.SetClassification(None) |
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|
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self.store = store |
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|
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self.changed(LAYER_SHAPESTORE_REPLACED, self) |
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|
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def ShapeStore(self): |
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return self.store |
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|
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def Destroy(self): |
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BaseLayer.Destroy(self) |
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if self.__classification is not None: |
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self.__classification.Unsubscribe(CLASS_CHANGED, |
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self._classification_changed) |
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|
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def BoundingBox(self): |
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"""Return the layer's bounding box in the intrinsic coordinate system. |
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|
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If the layer has no shapes, return None. |
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""" |
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return self.store.BoundingBox() |
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|
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def LatLongBoundingBox(self): |
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"""Return the layer's bounding box in lat/long coordinates. |
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|
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Return None, if the layer doesn't contain any shapes. |
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""" |
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bbox = self.BoundingBox() |
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if bbox is not None and self.projection is not None: |
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bbox = self.projection.InverseBBox(bbox) |
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return bbox |
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|
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def Type(self): |
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return self.ShapeType(); |
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|
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def ShapesBoundingBox(self, shapes): |
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"""Return a bounding box in lat/long coordinates for the given |
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list of shape ids. |
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|
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If shapes is None or empty, return None. |
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""" |
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|
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if shapes is None or len(shapes) == 0: return None |
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|
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xs = [] |
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ys = [] |
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|
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for id in shapes: |
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bbox = self.Shape(id).compute_bbox() |
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if self.projection is not None: |
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bbox = self.projection.InverseBBox(bbox) |
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left, bottom, right, top = bbox |
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xs.append(left); xs.append(right) |
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ys.append(bottom); ys.append(top) |
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|
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return (min(xs), min(ys), max(xs), max(ys)) |
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|
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|
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def GetFieldType(self, fieldName): |
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if self.store: |
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table = self.store.Table() |
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if table.HasColumn(fieldName): |
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return table.Column(fieldName).type |
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return None |
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|
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def HasShapes(self): |
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return True |
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|
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def NumShapes(self): |
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"""Return the number of shapes in the layer""" |
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return self.store.NumShapes() |
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|
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def ShapeType(self): |
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"""Return the type of the shapes in the layer. |
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|
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The return value is one of the SHAPETYPE_* constants defined in |
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Thuban.Model.data. |
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""" |
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return self.store.ShapeType() |
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|
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def Shape(self, index): |
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"""Return the shape with index index""" |
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return self.store.Shape(index) |
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|
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def ShapesInRegion(self, bbox): |
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"""Return an iterable over the shapes that overlap the bounding box. |
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|
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The bbox parameter should be the bounding box as a tuple in the |
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form (minx, miny, maxx, maxy) in unprojected coordinates. |
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""" |
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if self.projection is not None: |
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# Ensure that region lies within the layer's bounding box |
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# Otherwise projection of the region would lead to incorrect |
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# values. |
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clipbbox = self.__mangle_bounding_box(bbox) |
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bbox = self.projection.ForwardBBox(clipbbox) |
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return self.store.ShapesInRegion(bbox) |
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|
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def GetClassificationColumn(self): |
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return self.classification_column |
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|
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def SetClassificationColumn(self, column): |
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"""Set the column to classifiy on, or None. If column is not None |
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and the column does not exist in the table, raise a ValueError. |
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""" |
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if column: |
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columnType = self.GetFieldType(column) |
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if columnType is None: |
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raise ValueError() |
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changed = self.classification_column != column |
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self.classification_column = column |
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if changed: |
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self.changed(LAYER_CHANGED, self) |
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|
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def HasClassification(self): |
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return True |
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|
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def GetClassification(self): |
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return self.__classification |
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|
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def SetClassification(self, clazz): |
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"""Set the classification used by this layer to 'clazz' |
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|
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If 'clazz' is None a default classification is created. |
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|
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This issues a LAYER_CHANGED event. |
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""" |
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|
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if self.__classification is not None: |
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self.__classification.Unsubscribe(CLASS_CHANGED, |
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self._classification_changed) |
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|
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if clazz is None: |
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clazz = classification.Classification() |
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|
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self.__classification = clazz |
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self.__classification.Subscribe(CLASS_CHANGED, |
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self._classification_changed) |
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|
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self._classification_changed() |
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|
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def _classification_changed(self): |
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"""Called from the classification object when it has changed.""" |
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self.changed(LAYER_CHANGED, self) |
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|
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def TreeInfo(self): |
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items = [] |
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|
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items.append(_("Filename: %s") % self.ShapeStore().FileName()) |
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|
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if self.Visible(): |
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items.append(_("Shown")) |
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else: |
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items.append(_("Hidden")) |
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items.append(_("Shapes: %d") % self.NumShapes()) |
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|
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bbox = self.LatLongBoundingBox() |
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if bbox is not None: |
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items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % tuple(bbox)) |
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else: |
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items.append(_("Extent (lat-lon):")) |
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items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()]) |
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|
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if self.projection and len(self.projection.params) > 0: |
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items.append((_("Projection"), |
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[str(param) for param in self.projection.params])) |
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|
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items.append(self.__classification) |
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|
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return (_("Layer '%s'") % self.Title(), items) |
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|
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def __mangle_bounding_box(self, bbox): |
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# FIXME: This method doesn't make much sense. |
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# See RT #2845 which effectively says: |
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# |
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# If this method, which was originally called ClipBoundingBox, |
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# is supposed to do clipping it shouldn't return the parameter |
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# unchanged when it lies completely outside of the bounding box. |
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# It would be better to return None and return an empty list in |
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# ShapesInRegion (the only caller) in that case. |
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# |
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# This method was introduced to fix a bug that IIRC had |
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# something todo with projections and bounding boxes containing |
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# NaN or INF when the parameter to ShapesInRegion covered the |
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# entire earth or something similarly large). |
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bminx, bminy, bmaxx, bmaxy = bbox |
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lminx, lminy, lmaxx, lmaxy = self.LatLongBoundingBox() |
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if bminx > lmaxx or bmaxx < lminx: |
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left, right = bminx, bmaxx |
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else: |
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left = max(lminx, bminx) |
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right = min(lmaxx, bmaxx) |
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if bminy > lmaxy or bmaxy < lminy: |
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bottom, top = bminy, bmaxy |
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else: |
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bottom = max(lminy, bminy) |
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top = min(lmaxy, bmaxy) |
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|
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return (left, bottom, right, top) |
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|
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def GetLabelPosFromShape(self, cmap, shape_index): |
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''' |
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Return the label position parameters (x, y, halign, valign) from the |
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shape object |
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''' |
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proj = cmap.projection |
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if proj is not None: |
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map_proj = proj |
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else: |
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map_proj = None |
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proj = self.projection |
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if proj is not None: |
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layer_proj = proj |
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else: |
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layer_proj = None |
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|
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shapetype = self.ShapeType() |
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if shapetype == SHAPETYPE_POLYGON: |
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shapefile = self.ShapeStore().Shapefile().cobject() |
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x, y = shape_centroid(shapefile, shape_index, |
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map_proj, layer_proj, 1, 1, 0, 0) |
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if map_proj is not None: |
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x, y = map_proj.Inverse(x, y) |
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else: |
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shape = self.Shape(shape_index) |
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if shapetype == SHAPETYPE_POINT: |
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x, y = shape.Points()[0][0] |
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else: |
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# assume SHAPETYPE_ARC |
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points = shape.Points()[0] |
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x, y = points[len(points) / 2] |
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if layer_proj is not None: |
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x, y = layer_proj.Inverse(x, y) |
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if shapetype == SHAPETYPE_POINT: |
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halign = ALIGN_LEFT |
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valign = ALIGN_CENTER |
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elif shapetype == SHAPETYPE_POLYGON: |
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halign = ALIGN_CENTER |
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valign = ALIGN_CENTER |
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elif shapetype == SHAPETYPE_ARC: |
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halign = ALIGN_LEFT |
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valign = ALIGN_CENTER |
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|
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return (x, y, halign, valign) |
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|
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|
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|
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if resource.has_gdal_support(): |
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import gdal |
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from gdalconst import GA_ReadOnly |
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|
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class RasterLayer(BaseLayer): |
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|
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MASK_NONE = 0 |
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MASK_BIT = 1 |
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MASK_ALPHA = 2 |
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|
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def __init__(self, title, filename, projection = None, |
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visible = True, opacity = 1, masktype = MASK_BIT): |
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"""Initialize the Raster Layer. |
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|
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title -- title for the layer. |
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|
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filename -- file name of the source image. |
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|
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projection -- Projection object describing the projection which |
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the source image is in. |
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|
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visible -- True is the layer should initially be visible. |
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|
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Throws IOError if the filename is invalid or points to a file that |
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is not in a format GDAL can use. |
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""" |
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|
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BaseLayer.__init__(self, title, visible = visible) |
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|
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self.projection = projection |
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self.filename = os.path.abspath(filename) |
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|
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self.bbox = -1 |
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|
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self.mask_type = masktype |
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self.opacity = opacity |
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|
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self.image_info = None |
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|
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if resource.has_gdal_support(): |
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# |
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# temporarily open the file so that GDAL can test if it's valid. |
| 439 |
# |
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dataset = gdal.Open(self.filename, GA_ReadOnly) |
| 441 |
|
| 442 |
if dataset is None: |
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raise IOError() |
| 444 |
|
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# |
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# while we have the file, extract some basic information |
| 447 |
# that we can display later |
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# |
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self.image_info = {} |
| 450 |
|
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self.image_info["nBands"] = dataset.RasterCount |
| 452 |
self.image_info["Size"] = (dataset.RasterXSize, dataset.RasterYSize) |
| 453 |
self.image_info["Driver"] = dataset.GetDriver().ShortName |
| 454 |
|
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# store some information about the individual bands |
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# [min_value, max_value] |
| 457 |
a = self.image_info["BandData"] = [] |
| 458 |
|
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for i in range(1, dataset.RasterCount+1): |
| 460 |
band = dataset.GetRasterBand(i) |
| 461 |
a.append(band.ComputeRasterMinMax()) |
| 462 |
|
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self.UnsetModified() |
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|
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def BoundingBox(self): |
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"""Return the layer's bounding box in the intrinsic coordinate system. |
| 467 |
|
| 468 |
If the there is no support for images, or the file cannot |
| 469 |
be read, or there is no geographics information available, return None. |
| 470 |
""" |
| 471 |
if not resource.has_gdal_support(): |
| 472 |
return None |
| 473 |
|
| 474 |
if self.bbox == -1: |
| 475 |
dataset = gdal.Open(self.filename, GA_ReadOnly) |
| 476 |
if dataset is None: |
| 477 |
self.bbox = None |
| 478 |
else: |
| 479 |
geotransform = dataset.GetGeoTransform() |
| 480 |
if geotransform is None: |
| 481 |
return None |
| 482 |
|
| 483 |
x = 0 |
| 484 |
y = dataset.RasterYSize |
| 485 |
left = geotransform[0] + \ |
| 486 |
geotransform[1] * x + \ |
| 487 |
geotransform[2] * y |
| 488 |
|
| 489 |
bottom = geotransform[3] + \ |
| 490 |
geotransform[4] * x + \ |
| 491 |
geotransform[5] * y |
| 492 |
|
| 493 |
x = dataset.RasterXSize |
| 494 |
y = 0 |
| 495 |
right = geotransform[0] + \ |
| 496 |
geotransform[1] * x + \ |
| 497 |
geotransform[2] * y |
| 498 |
|
| 499 |
top = geotransform[3] + \ |
| 500 |
geotransform[4] * x + \ |
| 501 |
geotransform[5] * y |
| 502 |
|
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self.bbox = (left, bottom, right, top) |
| 504 |
|
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return self.bbox |
| 506 |
|
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def LatLongBoundingBox(self): |
| 508 |
bbox = self.BoundingBox() |
| 509 |
if bbox is None: |
| 510 |
return None |
| 511 |
|
| 512 |
if self.projection is not None: |
| 513 |
bbox = self.projection.InverseBBox(bbox) |
| 514 |
|
| 515 |
return bbox |
| 516 |
|
| 517 |
def Type(self): |
| 518 |
return "Image" |
| 519 |
|
| 520 |
def GetImageFilename(self): |
| 521 |
return self.filename |
| 522 |
|
| 523 |
def MaskType(self): |
| 524 |
"""Return True if the mask should be used when rendering the layer.""" |
| 525 |
return self.mask_type |
| 526 |
|
| 527 |
def SetMaskType(self, type): |
| 528 |
"""Set the type of mask to use. |
| 529 |
|
| 530 |
type can be one of MASK_NONE, MASK_BIT, MASK_ALPHA |
| 531 |
|
| 532 |
If the state changes, a LAYER_CHANGED message is sent. |
| 533 |
""" |
| 534 |
if type not in (self.MASK_NONE, self.MASK_BIT, self.MASK_ALPHA): |
| 535 |
raise ValueError("type is invalid") |
| 536 |
|
| 537 |
if type != self.mask_type: |
| 538 |
self.mask_type = type |
| 539 |
self.changed(LAYER_CHANGED, self) |
| 540 |
|
| 541 |
def Opacity(self): |
| 542 |
"""Return the level of opacity used in alpha blending. |
| 543 |
""" |
| 544 |
return self.opacity |
| 545 |
|
| 546 |
def SetOpacity(self, op): |
| 547 |
"""Set the level of alpha opacity. |
| 548 |
|
| 549 |
0 <= op <= 1. |
| 550 |
|
| 551 |
The layer is fully opaque when op = 1. |
| 552 |
""" |
| 553 |
if not (0 <= op <= 1): |
| 554 |
raise ValueError("op out of range") |
| 555 |
|
| 556 |
if op != self.opacity: |
| 557 |
self.opacity = op |
| 558 |
self.changed(LAYER_CHANGED, self) |
| 559 |
|
| 560 |
def ImageInfo(self): |
| 561 |
return self.image_info |
| 562 |
|
| 563 |
def TreeInfo(self): |
| 564 |
items = [] |
| 565 |
|
| 566 |
items.append(_("Filename: %s") % self.GetImageFilename()) |
| 567 |
|
| 568 |
if self.Visible(): |
| 569 |
items.append(_("Shown")) |
| 570 |
else: |
| 571 |
items.append(_("Hidden")) |
| 572 |
|
| 573 |
bbox = self.LatLongBoundingBox() |
| 574 |
if bbox is not None: |
| 575 |
items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox) |
| 576 |
else: |
| 577 |
items.append(_("Extent (lat-lon):")) |
| 578 |
|
| 579 |
if self.projection and len(self.projection.params) > 0: |
| 580 |
items.append((_("Projection"), |
| 581 |
[str(param) for param in self.projection.params])) |
| 582 |
|
| 583 |
return (_("Layer '%s'") % self.Title(), items) |
| 584 |
|
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