/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 641 by jonathan, Thu Apr 10 14:36:19 2003 UTC revision 1481 by bh, Thu Jul 24 17:52:59 2003 UTC
# Line 2  Line 2 
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
5    # Frank Koormann <[email protected]>
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
9    
10  __version__ = "$Revision$"  __version__ = "$Revision$"
11    
12  from wxPython.wx import wxPoint, wxPen, wxBrush, wxFont, \  import cStringIO
      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  
      wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  
   
 from wxproj import draw_polygon_shape  
13    
14  from Thuban import _  from Thuban import _
 from Thuban.UI.common import *  
15    
16  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from wxPython.wx import wxMemoryDC, wxEmptyBitmap, \
17       SHAPETYPE_POINT      wxPoint, wxRect, wxPen, wxBrush, wxFont, \
18        wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
19        wxBLACK_PEN, wxRED_PEN, wxBLACK, \
20        wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
21        wxBitmap, wxImageFromBitmap, wxBitmapFromImage, \
22        wxImageFromStream, wxBITMAP_TYPE_BMP
23    
24    from wxproj import draw_polygon_shape, draw_polygon_init
25    
26    from Thuban.UI.common import Color2wxColour
27    from Thuban.UI.classifier import ClassDataPreviewer
28    from Thuban.UI.scalebar import ScaleBar
29    
30    from Thuban.Model.layer import Layer, RasterLayer, \
31         SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT
32  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
33       ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE       ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE
34    
35  from Thuban.Model.classification import Classification  from Thuban.Model.classification import Classification
36  from Thuban.Model.color import Color  from Thuban.Model.color import Transparent
37    import Thuban.Model.resource
38    
39    if Thuban.Model.resource.has_gdal_support():
40        from gdalwarp import ProjectRasterFile
41    
42  class MapRenderer:  class MapRenderer:
43    
# Line 49  class MapRenderer: Line 62  class MapRenderer:
62          """          """
63          # resolution in pixel/inch          # resolution in pixel/inch
64    
         assert scale > 0  
   
65          self.dc = dc          self.dc = dc
66          self.scale = scale          self.scale = scale
67          self.offset = offset          self.offset = offset
# Line 62  class MapRenderer: Line 73  class MapRenderer:
73    
74      def render_map(self, map):      def render_map(self, map):
75          self.map = map          self.map = map
76            seenRaster = True
77    
78            self.dc.BeginDrawing()
79    
80            #
81            # This is only a good optimization if there is only one
82            # raster layer and the image covers the entire window (as
83            # it currently does). We note if there is a raster layer
84            # and only begin drawing layers once we have drawn it.
85            # That way we avoid drawing layers that won't be seen.
86            #
87            if Thuban.Model.resource.has_gdal_support():
88                for layer in map.Layers():
89                    if isinstance(layer, RasterLayer) and layer.Visible():
90                        seenRaster = False
91                        break
92    
93          for layer in map.Layers():          for layer in map.Layers():
94              # if honor_visibility is true, only draw visible layers,              # if honor_visibility is true, only draw visible layers,
95              # otherwise draw all layers              # otherwise draw all layers
96              if not self.honor_visibility or layer.Visible():              if not self.honor_visibility or layer.Visible():
97                  self.draw_shape_layer(layer)                  if isinstance(layer, Layer) and seenRaster:
98                        self.draw_shape_layer(layer)
99                    elif isinstance(layer, RasterLayer) \
100                        and Thuban.Model.resource.has_gdal_support():
101                        self.draw_raster_layer(layer)
102                        seenRaster = True
103    
104          self.draw_label_layer(map.LabelLayer())          self.draw_label_layer(map.LabelLayer())
105    
106            self.dc.EndDrawing()
107    
108      def draw_shape_layer(self, layer):      def draw_shape_layer(self, layer):
109          scale = self.scale          scale = self.scale
110          offx, offy = self.offset          offx, offy = self.offset
# Line 82  class MapRenderer: Line 118  class MapRenderer:
118          pen   = wxTRANSPARENT_PEN          pen   = wxTRANSPARENT_PEN
119    
120          old_prop = None          old_prop = None
121            old_group = None
122          lc = layer.GetClassification()          lc = layer.GetClassification()
123          field = lc.GetField()          field = layer.GetClassificationColumn()
124            defaultGroup = lc.GetDefaultGroup()
125    
         defaultProps = lc.GetDefaultGroup().GetProperties()  
126    
         for i in self.layer_ids(layer):  
             value = None  
127    
128              if field is not None:          if shapetype == SHAPETYPE_POINT:
129                  try:              draw_func = self.draw_point_shape
130                      record = layer.table.read_record(i)              draw_func_param = layer
131                      if record is not None:          else:
132                          value = record[field]              draw_func = draw_polygon_shape
133                  except:              draw_func_param = self.polygon_render_param(layer)
                     pass  
   
                 #  
                 # if the above statements fail 'value' should  
                 # be null, at which point this call will  
                 # at least retreive the NullData  
                 #  
   
                 group = lc.FindGroup(value)  
                 if not group.IsVisible():  
                     continue  
134    
135                  #prop = lc.GetProperties(value)          table = layer.ShapeStore().Table()
136                  prop = group.GetProperties()          for i in self.layer_ids(layer):
137    
138                if field is None:
139                    group = defaultGroup
140              else:              else:
141                  prop = defaultProps                  record = table.ReadRowAsDict(i)
142                    assert record is not None
143                    group = lc.FindGroup(record[field])
144    
145    
146                if not group.IsVisible():
147                    continue
148    
149    
150              # don't recreate new objects if they are the same as before              # don't recreate new objects if they are the same as before
151              if prop != old_prop:              if group is not old_group:
152                  old_prop = prop                  old_group = group
153    
154                  if shapetype == SHAPETYPE_ARC:                  prop = group.GetProperties()
155                      fill = Color.Transparent  
156                  else:                  if prop != old_prop:
157                      fill = prop.GetFill()                      old_prop = prop
158        
159                  if fill is Color.Transparent:                      if shapetype == SHAPETYPE_ARC:
160                      brush = wxTRANSPARENT_BRUSH                          fill = Transparent
161                  else:                      else:
162                      color = Color2wxColour(fill)                          fill = prop.GetFill()
163                      brush = wxBrush(color, wxSOLID)  
164        
165                  stroke = prop.GetLineColor()                      if fill is Transparent:
166                  stroke_width = prop.GetLineWidth()                          brush = wxTRANSPARENT_BRUSH
167                  if stroke is Color.Transparent:                      else:
168                      pen = wxTRANSPARENT_PEN                          color = Color2wxColour(fill)
169                  else:                          brush = wxBrush(color, wxSOLID)
170                      color = Color2wxColour(stroke)  
171                      pen = wxPen(color, stroke_width, wxSOLID)                      stroke = prop.GetLineColor()
172                            stroke_width = prop.GetLineWidth()
173              if shapetype == SHAPETYPE_POINT:                      if stroke is Transparent:
174                  self.dc.SetBrush(brush)                          pen = wxTRANSPARENT_PEN
175                  self.dc.SetPen(pen)                      else:
176                  self.draw_point_shape(layer, i)                          color = Color2wxColour(stroke)
177              else:                          pen = wxPen(color, stroke_width, wxSOLID)
178                  self.draw_polygon_shape(layer, i, pen, brush)  
179                draw_func(draw_func_param, i, pen, brush)
180    
181        def draw_raster_layer(self, layer):
182            data = None
183            offx, offy = self.offset
184            width, height = self.dc.GetSizeTuple()
185    
186            inProj = ""
187            proj = layer.GetProjection()
188            if proj is not None:
189                for p in proj.GetAllParameters():
190                    inProj += "+" + p + " "
191    
192            outProj = ""
193            proj = self.map.GetProjection()
194            if proj is not None:
195                for p in proj.GetAllParameters():
196                    outProj += "+" + p + " "
197    
198            xmin = (0 - offx) / self.scale
199            ymin = (offy - height) / self.scale
200            xmax = (width - offx) / self.scale
201            ymax = (offy - 0) / self.scale
202    
203            try:
204                data = ProjectRasterFile(
205                    layer.GetImageFilename(),
206                    inProj,
207                    outProj,
208                    (xmin, ymin, xmax, ymax),
209                    "", (width, height))
210            except IOError, (strerr):
211                print strerr
212            except (AttributeError, ValueError):
213                pass
214            else:
215                if data is not None:
216                    stream = cStringIO.StringIO(data)
217                    image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
218                    bitmap = wxBitmapFromImage(image)
219                    self.dc.DrawBitmap(bitmap, 0, 0)
220    
221      def layer_ids(self, layer):      def layer_ids(self, layer):
222          """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.
223            
224          The default implementation simply returns all ids in the layer.          The default implementation simply returns all ids in the layer.
225          Override in derived classes to be more precise.          Override in derived classes to be more precise.
226          """          """
227          return range(layer.NumShapes())          return range(layer.NumShapes())
228    
229      def draw_polygon_shape(self, layer, index, pen, brush):      def polygon_render_param(self, layer):
230          offx, offy = self.offset                  """Return the low-lever render parameter for the layer"""
231          draw_polygon_shape(layer.shapefile.cobject(), index,          offx, offy = self.offset
232                             self.dc, pen, brush,          return draw_polygon_init(layer.ShapeStore().Shapefile(), self.dc,
233                             self.map.projection, layer.projection,                                   self.map.projection,
234                             self.scale, -self.scale, offx, offy)                                   layer.projection,
235                                     self.scale, -self.scale,
236                                     offx, offy)
237    
238        def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):
239            draw_polygon_shape(draw_polygon_info, index, pen, brush)
240    
241      def projected_points(self, layer, index):      def projected_points(self, layer, index):
242          proj = self.map.projection          proj = self.map.GetProjection()
243          if proj is not None:          if proj is not None:
244              forward = proj.Forward              forward = proj.Forward
245          else:          else:
246              forward = None              forward = None
247          proj = layer.projection          proj = layer.GetProjection()
248          if proj is not None:          if proj is not None:
249              inverse = proj.Inverse              inverse = proj.Inverse
250          else:          else:
# Line 186  class MapRenderer: Line 266  class MapRenderer:
266          points = self.projected_points(layer, index)          points = self.projected_points(layer, index)
267          self.dc.DrawLines(points)          self.dc.DrawLines(points)
268    
269      def draw_point_shape(self, layer, index):      def draw_point_shape(self, layer, index, pen, brush):
270          pp = self.projected_points(layer, index)          pp = self.projected_points(layer, index)
271    
272          if len(pp) == 0: return # ignore Null Shapes which have no points          if len(pp) == 0: return # ignore Null Shapes which have no points
273    
274          p = pp[0]          p = pp[0]
275          radius = self.resolution * 5          radius = self.resolution * 5
276            self.dc.SetBrush(brush)
277            self.dc.SetPen(pen)
278          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)
279    
280      def draw_label_layer(self, layer):      def draw_label_layer(self, layer):
# Line 260  class ScreenRenderer(MapRenderer): Line 342  class ScreenRenderer(MapRenderer):
342    
343              shapetype = layer.ShapeType()              shapetype = layer.ShapeType()
344              if shapetype == SHAPETYPE_POLYGON:              if shapetype == SHAPETYPE_POLYGON:
345                    offx, offy = self.offset
346                    renderparam = self.polygon_render_param(layer)
347                  func = self.draw_polygon_shape                  func = self.draw_polygon_shape
348                  args = (pen, brush)                  args = (pen, brush)
349              elif shapetype == SHAPETYPE_ARC:              elif shapetype == SHAPETYPE_ARC:
350                    renderparam = self.polygon_render_param(layer)
351                  func = self.draw_polygon_shape                  func = self.draw_polygon_shape
352                  args = (pen, None)                  args = (pen, None)
353              elif shapetype == SHAPETYPE_POINT:              elif shapetype == SHAPETYPE_POINT:
354                  self.dc.SetBrush(brush)                  renderparam = layer
                 self.dc.SetPen(pen)  
355                  func = self.draw_point_shape                  func = self.draw_point_shape
356                  args = ()                  args = (pen, brush)
357              else:              else:
358                  raise TypeError(_("Unhandled shape type %s") % shapetype)                  raise TypeError(_("Unhandled shape type %s") % shapetype)
359    
360              for index in self.selected_shapes:              for index in self.selected_shapes:
361                  func(layer, index, *args)                  func(renderparam, index, *args)
362    
363      def layer_ids(self, layer):      def layer_ids(self, layer):
364          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
# Line 314  class ScreenRenderer(MapRenderer): Line 398  class ScreenRenderer(MapRenderer):
398          return layer.ShapesInRegion((left, bottom, right, top))          return layer.ShapesInRegion((left, bottom, right, top))
399    
400    
401  class PrinterRender(MapRenderer):  class ExportRenderer(ScreenRenderer):
402    
403      # When printing we want to see all layers      honor_visibility = 1
     honor_visibility = 0  
   
     RenderMap = MapRenderer.render_map  
404            
405        def RenderMap(self, map, region, mapregion,
406                      selected_layer, selected_shapes ):
407            """Render the map.
408    
409            The rendering device has been specified during initialisation.
410            The device border distance was set in Thuban.UI.view.OutputTranform().
411            
412            RenderMap renders a frame set (one page frame, one around
413            legend/scalebar and one around the map), the map, the legend and the
414            scalebar on the given DC. The map is rendered with the region displayed
415            in the canvas view, centered on the area available for map display.
416            """
417            
418            self.update_region = region
419            self.selected_layer = selected_layer
420            self.selected_shapes = selected_shapes
421    
422            # Get some dimensions
423            llx, lly, urx, ury = region
424            self.mapregion = mapregion
425            mminx, mminy, mmaxx, mmaxy = self.mapregion
426    
427            # Manipulate the offset to position the map
428            offx, offy = self.offset
429            # 1. Shift to corner of map drawing area
430            offx = offx + mminx
431            offy = offy + mminy
432    
433            # 2. Center the map on the map drawing area:
434            # region identifies the region on the canvas view:
435            # center of map drawing area - half the size of region: rendering origin
436            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
437            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
438    
439            self.offset = (offx+self.shiftx, offy+self.shifty)
440    
441            # Draw the map
442            self.dc.BeginDrawing()
443            self.dc.DestroyClippingRegion()
444            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
445                                      urx, ury)
446            self.render_map(map)
447            self.dc.EndDrawing()
448    
449            # Draw the rest (frames, legend, scalebar)
450            self.dc.BeginDrawing()
451            self.dc.DestroyClippingRegion()
452    
453            # Force the font for Legend drawing
454            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
455            self.dc.SetFont(font)
456    
457            self.render_frame(region)
458            self.render_legend(map)
459            self.render_scalebar(map)
460            self.dc.EndDrawing()
461    
462        def render_frame(self, region):
463            """Render the frames for map and legend/scalebar."""
464    
465            dc = self.dc
466            dc.SetPen(wxBLACK_PEN)
467            dc.SetBrush(wxTRANSPARENT_BRUSH)
468    
469            # Dimension stuff
470            width, height = dc.GetSizeTuple()
471            mminx, mminy, mmaxx, mmaxy = self.mapregion
472    
473            # Page Frame
474            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
475            
476            # Map Frame
477            llx, lly, urx, ury = region
478            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
479            
480            # Legend Frame
481            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
482    
483            dc.DestroyClippingRegion()
484            dc.SetClippingRegion(mmaxx+10,mminy,
485                                 (width-20) - (mmaxx+10), mmaxy-mminy)
486    
487        def render_legend(self, map):
488            """Render the legend on the Map."""
489    
490            previewer = ClassDataPreviewer()
491            dc = self.dc
492            dc.SetPen(wxBLACK_PEN)
493            dc.SetBrush(wxTRANSPARENT_BRUSH)
494    
495            # Dimension stuff
496            width, height = dc.GetSizeTuple()
497            mminx, mminy, mmaxx, mmaxy = self.mapregion
498            textwidth, textheight = dc.GetTextExtent("0")
499            iconwidth  = textheight
500            iconheight = textheight
501            stepy = textheight+3
502            dx = 10
503            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
504                                    # 5 pix inside legend frame
505            posy = mminy + 5        # 5 pix inside legend frame
506            
507            # Render the legend
508            dc.SetTextForeground(wxBLACK)
509            if map.HasLayers():
510                layers = map.Layers()
511                layers.reverse()
512                for l in layers:
513                    if l.Visible():
514                        # Render title
515                        dc.DrawText(l.Title(), posx, posy)
516                        posy+=stepy
517                        if l.HasClassification():
518                            # Render classification
519                            clazz = l.GetClassification()
520                            shapeType = l.ShapeType()
521                            for g in clazz:
522                                if g.IsVisible():
523                                    previewer.Draw(dc,
524                                        wxRect(posx+dx, posy,
525                                               iconwidth, iconheight),
526                                        g.GetProperties(), shapeType)
527                                    dc.DrawText(g.GetDisplayText(),
528                                                posx+2*dx+iconwidth, posy)
529                                    posy+=stepy
530            
531        def render_scalebar(self, map):
532            """Render the scalebar."""
533    
534            scalebar = ScaleBar(map)
535    
536            # Dimension stuff
537            width, height = self.dc.GetSizeTuple()
538            mminx, mminy, mmaxx, mmaxy = self.mapregion
539          
540            # Render the scalebar
541            scalebar.DrawScaleBar(self.scale, self.dc,
542                                 (mmaxx+10+5, mmaxy-25),
543                                 ((width-15-5) - (mmaxx+10+5),20)
544                                )
545            # 10 pix between map and legend frame, 5 pix inside legend frame
546            # 25 pix from the legend frame bottom line
547            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
548            # Height: 20
549    
550    class PrinterRenderer(ExportRenderer):
551    
552        # Printing as well as Export / Screen display only the visible layer.
553        honor_visibility = 1
554    
Legend:
Removed from v.641  
changed lines
  Added in v.1481
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