/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 394 by jonathan, Mon Feb 10 15:27:13 2003 UTC revision 882 by jonathan, Fri May 9 16:34:28 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    
11  from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \  from Thuban import _
12    
13    from wxPython.wx import wxPoint, wxPen, wxBrush, wxFont, \
14       wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \       wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
15       wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL       wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL
16    
17  from wxproj import draw_polygon_shape  from wxproj import draw_polygon_shape, draw_polygon_init
18    
19  from Thuban import _  from Thuban.UI.common import Color2wxColour
20    
21  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
22       SHAPETYPE_POINT       SHAPETYPE_POINT
# Line 21  from Thuban.Model.label import ALIGN_CEN Line 24  from Thuban.Model.label import ALIGN_CEN
24       ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE       ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE
25    
26  from Thuban.Model.classification import Classification  from Thuban.Model.classification import Classification
27    from Thuban.Model.color import Color
28    
29  class MapRenderer:  class MapRenderer:
30    
# Line 45  class MapRenderer: Line 48  class MapRenderer:
48                  the renderer's default.                  the renderer's default.
49          """          """
50          # resolution in pixel/inch          # resolution in pixel/inch
51    
52          self.dc = dc          self.dc = dc
53          self.scale = scale          self.scale = scale
54          self.offset = offset          self.offset = offset
# Line 76  class MapRenderer: Line 80  class MapRenderer:
80          pen   = wxTRANSPARENT_PEN          pen   = wxTRANSPARENT_PEN
81    
82          old_prop = None          old_prop = None
83            old_group = None
84            lc = layer.GetClassification()
85            field = lc.GetField()
86            defaultGroup = lc.GetDefaultGroup()
87    
88    
89            if shapetype != SHAPETYPE_POINT:
90                polygon_render_param = self.polygon_render_param(layer)
91    
92            if shapetype == SHAPETYPE_POINT:
93                draw_func = lambda i: \
94                       self.draw_point_shape(layer, i)
95            else:
96                draw_func = lambda i: \
97                       self.draw_polygon_shape(polygon_render_param, i, pen, brush)
98                
99          for i in self.layer_ids(layer):          for i in self.layer_ids(layer):
100              value = None  
101              shape = layer.Shape(i)              if field is None:
102              lc = layer.classification                  group = defaultGroup
             field = lc.field  
   
             if field is not None:  
                 record = layer.table.read_record(i)  
                 if record is not None:  
                     value = record[field]  
   
             #  
             # if the above statements fail 'value' should  
             # be null, at which point this call will  
             # at least retreive the NullData  
             #  
             prop = lc.GetProperties(value)  
   
             if prop != old_prop:  
                 old_prop = prop  
   
                 if shapetype == SHAPETYPE_ARC:  
                     fill = None  
                 else:  
                     fill = prop.GetFill()  
       
                 if fill is None:  
                     brush = wxTRANSPARENT_BRUSH  
                 else:  
                     color = wxColour(fill.red * 255,  
                                      fill.green * 255,  
                                      fill.blue * 255)  
                     brush = wxBrush(color, wxSOLID)  
       
                 stroke = prop.GetStroke()  
                 stroke_width = prop.GetStrokeWidth()  
                 if stroke is None:  
                     pen = wxTRANSPARENT_PEN  
                 else:  
                     color = wxColour(stroke.red * 255,  
                                      stroke.green * 255,  
                                      stroke.blue * 255)  
                     pen = wxPen(color, stroke_width, wxSOLID)  
       
             if shapetype == SHAPETYPE_POINT:  
                 self.dc.SetBrush(brush)  
                 self.dc.SetPen(pen)  
                 self.draw_point_shape(layer, i)  
103              else:              else:
104                  self.draw_polygon_shape(layer, i, pen, brush)                  record = layer.table.ReadRowAsDict(i)
105                    assert record is not None
106                    group = lc.FindGroup(record[field])
107    
108    
109                if not group.IsVisible():
110                    continue
111    
112    
113                # don't recreate new objects if they are the same as before
114                if group is not old_group:
115                    old_group = group
116    
117                    prop = group.GetProperties()
118    
119                    if prop != old_prop:
120                        old_prop = prop
121    
122                        if shapetype == SHAPETYPE_ARC:
123                            fill = Color.Transparent
124                        else:
125                            fill = prop.GetFill()
126    
127    
128                        if fill is Color.Transparent:
129                            brush = wxTRANSPARENT_BRUSH
130                        else:
131                            color = Color2wxColour(fill)
132                            brush = wxBrush(color, wxSOLID)
133    
134                        stroke = prop.GetLineColor()
135                        stroke_width = prop.GetLineWidth()
136                        if stroke is Color.Transparent:
137                            pen = wxTRANSPARENT_PEN
138                        else:
139                            color = Color2wxColour(stroke)
140                            pen = wxPen(color, stroke_width, wxSOLID)
141    
142                        if shapetype == SHAPETYPE_POINT:
143                            self.dc.SetBrush(brush)
144                            self.dc.SetPen(pen)
145    
146                draw_func(i)
147    
148      def layer_ids(self, layer):      def layer_ids(self, layer):
149          """Return the shape ids of the given layer that have to be drawn.          """Return the shape ids of the given layer that have to be drawn.
150            
151          The default implementation simply returns all ids in the layer.          The default implementation simply returns all ids in the layer.
152          Override in derived classes to be more precise.          Override in derived classes to be more precise.
153          """          """
154          return range(layer.NumShapes())          return range(layer.NumShapes())
155    
156      def draw_polygon_shape(self, layer, index, pen, brush):      def polygon_render_param(self, layer):
157          offx, offy = self.offset                  """Return the low-lever render parameter for the layer"""
158          draw_polygon_shape(layer.shapefile.cobject(), index,          offx, offy = self.offset
159                             self.dc, pen, brush,          return draw_polygon_init(layer.shapefile, self.dc,
160                             self.map.projection, layer.projection,                                   self.map.projection,
161                             self.scale, -self.scale, offx, offy)                                   layer.projection,
162                                     self.scale, -self.scale,
163                                     offx, offy)
164    
165        def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):
166            draw_polygon_shape(draw_polygon_info, index, pen, brush)
167    
168      def projected_points(self, layer, index):      def projected_points(self, layer, index):
169          proj = self.map.projection          proj = self.map.GetProjection()
170          if proj is not None:          if proj is not None:
171              forward = proj.Forward              forward = proj.Forward
172          else:          else:
173              forward = None              forward = None
174          proj = layer.projection          proj = layer.GetProjection()
175          if proj is not None:          if proj is not None:
176              inverse = proj.Inverse              inverse = proj.Inverse
177          else:          else:
# Line 171  class MapRenderer: Line 194  class MapRenderer:
194          self.dc.DrawLines(points)          self.dc.DrawLines(points)
195    
196      def draw_point_shape(self, layer, index):      def draw_point_shape(self, layer, index):
197          p = self.projected_points(layer, index)[0]          pp = self.projected_points(layer, index)
198    
199            if len(pp) == 0: return # ignore Null Shapes which have no points
200    
201            p = pp[0]
202          radius = self.resolution * 5          radius = self.resolution * 5
203          self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)          self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)
204    
# Line 219  class ScreenRenderer(MapRenderer): Line 246  class ScreenRenderer(MapRenderer):
246      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
247      honor_visibility = 1      honor_visibility = 1
248            
249      def RenderMap(self, map, region, selected_layer, selected_shape):      def RenderMap(self, map, region, selected_layer, selected_shapes):
250          """Render the map.          """Render the map.
251    
252          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
253          by a wxrect's asTuple method) needs to be redrawn. Highlight the          by a wxrect's asTuple method) needs to be redrawn. Highlight the
254          shape with id selected_shape in the selected_layer.          shapes given by the ids in selected_shapes in the
255            selected_layer.
256          """          """
257          self.update_region = region          self.update_region = region
258          self.selected_layer = selected_layer          self.selected_layer = selected_layer
259          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
260          self.render_map(map)          self.render_map(map)
261    
262      def draw_shape_layer(self, layer):      def draw_shape_layer(self, layer):
263          MapRenderer.draw_shape_layer(self, layer)          MapRenderer.draw_shape_layer(self, layer)
264          if layer is self.selected_layer and self.selected_shape is not None:          if layer is self.selected_layer and self.selected_shapes:
265              pen = wxPen(wxBLACK, 3, wxSOLID)              pen = wxPen(wxBLACK, 3, wxSOLID)
266              brush = wxBrush(wxBLACK, wxCROSS_HATCH)              brush = wxBrush(wxBLACK, wxCROSS_HATCH)
267                
268              shapetype = layer.ShapeType()              shapetype = layer.ShapeType()
             index = self.selected_shape  
269              if shapetype == SHAPETYPE_POLYGON:              if shapetype == SHAPETYPE_POLYGON:
270                  self.draw_polygon_shape(layer, index, pen, brush)                  offx, offy = self.offset
271                    renderparam = self.polygon_render_param(layer)
272                    func = self.draw_polygon_shape
273                    args = (pen, brush)
274              elif shapetype == SHAPETYPE_ARC:              elif shapetype == SHAPETYPE_ARC:
275                  self.draw_polygon_shape(layer, index, pen, None)                  renderparam = self.polygon_render_param(layer)
276              else:                  func = self.draw_polygon_shape
277                    args = (pen, None)
278                elif shapetype == SHAPETYPE_POINT:
279                    renderparam = layer
280                  self.dc.SetBrush(brush)                  self.dc.SetBrush(brush)
281                  self.dc.SetPen(pen)                  self.dc.SetPen(pen)
282                  if shapetype == SHAPETYPE_POINT:                  func = self.draw_point_shape
283                      self.draw_point_shape(layer, index)                  args = ()
284                  else:              else:
285                      raise TypeError(_("Unhandled shape type %s") % shapetype)                  raise TypeError(_("Unhandled shape type %s") % shapetype)
286    
287                for index in self.selected_shapes:
288                    func(renderparam, index, *args)
289    
290    
291      def layer_ids(self, layer):      def layer_ids(self, layer):
292          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
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