/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 909 by frank, Fri May 16 16:23:12 2003 UTC revision 1750 by bh, Wed Sep 24 15:46:27 2003 UTC
# Line 9  Line 9 
9    
10  __version__ = "$Revision$"  __version__ = "$Revision$"
11    
12    import cStringIO
13    
14  from Thuban import _  from Thuban import _
15    
16  from wxPython.wx import wxMemoryDC, wxEmptyBitmap, \  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
     wxPoint, wxRect, wxPen, wxBrush, wxFont, \  
17      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
18      wxBLACK_PEN, wxRED_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL      wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
19        wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP
20    
21  from wxproj import draw_polygon_shape, draw_polygon_init  from wxproj import draw_polygon_shape, draw_polygon_init
22    
# Line 22  from Thuban.UI.common import Color2wxCol Line 24  from Thuban.UI.common import Color2wxCol
24  from Thuban.UI.classifier import ClassDataPreviewer  from Thuban.UI.classifier import ClassDataPreviewer
25  from Thuban.UI.scalebar import ScaleBar  from Thuban.UI.scalebar import ScaleBar
26    
27  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
28       SHAPETYPE_POINT       SHAPETYPE_POINT, RAW_SHAPEFILE
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
   
 from Thuban.Model.classification import Classification  
 from Thuban.Model.color import Color  
   
 class MapRenderer:  
   
     """Class to render a map onto a wxDC"""  
29    
30      honor_visibility = 1  from Thuban.Model.color import Transparent
31    import Thuban.Model.resource
32    
33      def __init__(self, dc, scale, offset, resolution = 72.0,  from baserenderer import BaseRenderer
                  honor_visibility = None):  
         """Inititalize the renderer.  
   
         dc -- the wxPython DC to render on  
         scale, offset -- the scale factor and translation to convert  
                 between projected coordinates and the DC coordinates  
   
         resolution -- the assumed resolution of the DC. Used to convert  
                 absolute lengths like font sizes to DC coordinates  
   
         honor_visibility -- boolean. If true, honor the visibility flag  
                 of the layers, otherwise draw all layers. If None, use  
                 the renderer's default.  
         """  
         # resolution in pixel/inch  
34    
35          self.dc = dc  class MapRenderer(BaseRenderer):
         self.scale = scale  
         self.offset = offset  
         if honor_visibility is not None:  
             self.honor_visibility = honor_visibility  
         # store the resolution in pixel/point because it's more useful  
         # later.  
         self.resolution = resolution / 72.0  
   
     def render_map(self, map):  
         self.map = map  
         for layer in map.Layers():  
             # if honor_visibility is true, only draw visible layers,  
             # otherwise draw all layers  
             if not self.honor_visibility or layer.Visible():  
                 self.draw_shape_layer(layer)  
         self.draw_label_layer(map.LabelLayer())  
36    
37      def draw_shape_layer(self, layer):      """Class to render a map onto a wxDC"""
         scale = self.scale  
         offx, offy = self.offset  
   
         map_proj = self.map.projection  
         layer_proj = layer.projection  
   
         shapetype = layer.ShapeType()  
   
         brush = wxTRANSPARENT_BRUSH  
         pen   = wxTRANSPARENT_PEN  
   
         old_prop = None  
         old_group = None  
         lc = layer.GetClassification()  
         field = lc.GetField()  
         defaultGroup = lc.GetDefaultGroup()  
38    
39        TRANSPARENT_PEN = wxTRANSPARENT_PEN
40        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
41    
42          if shapetype != SHAPETYPE_POINT:      make_point = wxPoint
             polygon_render_param = self.polygon_render_param(layer)  
43    
44          if shapetype == SHAPETYPE_POINT:      def tools_for_property(self, prop):
45              draw_func = lambda i: \          fill = prop.GetFill()
46                     self.draw_point_shape(layer, i)          if fill is Transparent:
47                brush = self.TRANSPARENT_BRUSH
48          else:          else:
49              draw_func = lambda i: \              brush = wxBrush(Color2wxColour(fill), wxSOLID)
                    self.draw_polygon_shape(polygon_render_param, i, pen, brush)  
               
         for i in self.layer_ids(layer):  
50    
51              if field is None:          stroke = prop.GetLineColor()
52                  group = defaultGroup          if stroke is Transparent:
53              else:              pen = self.TRANSPARENT_PEN
54                  record = layer.table.ReadRowAsDict(i)          else:
55                  assert record is not None              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
56                  group = lc.FindGroup(record[field])          return pen, brush
   
   
             if not group.IsVisible():  
                 continue  
   
   
             # don't recreate new objects if they are the same as before  
             if group is not old_group:  
                 old_group = group  
   
                 prop = group.GetProperties()  
   
                 if prop != old_prop:  
                     old_prop = prop  
   
                     if shapetype == SHAPETYPE_ARC:  
                         fill = Color.Transparent  
                     else:  
                         fill = prop.GetFill()  
   
   
                     if fill is Color.Transparent:  
                         brush = wxTRANSPARENT_BRUSH  
                     else:  
                         color = Color2wxColour(fill)  
                         brush = wxBrush(color, wxSOLID)  
   
                     stroke = prop.GetLineColor()  
                     stroke_width = prop.GetLineWidth()  
                     if stroke is Color.Transparent:  
                         pen = wxTRANSPARENT_PEN  
                     else:  
                         color = Color2wxColour(stroke)  
                         pen = wxPen(color, stroke_width, wxSOLID)  
   
                     if shapetype == SHAPETYPE_POINT:  
                         self.dc.SetBrush(brush)  
                         self.dc.SetPen(pen)  
   
             draw_func(i)  
57    
58      def layer_ids(self, layer):      def low_level_renderer(self, layer):
59          """Return the shape ids of the given layer that have to be drawn.          """Override inherited method to provide more efficient renderers
60    
61          The default implementation simply returns all ids in the layer.          If the underlying data format is not a shapefile or the layer
62          Override in derived classes to be more precise.          contains points shapes, simply use what the inherited method
63            returns.
64    
65            Otherwise, i.e. for arc and polygon use the more efficient
66            wxproj.draw_polygon_shape and its corresponding parameter
67            created with wxproj.draw_polygon_init.
68          """          """
69          return range(layer.NumShapes())          if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
70                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
71      def polygon_render_param(self, layer):              offx, offy = self.offset
72          """Return the low-lever render parameter for the layer"""              return (True, draw_polygon_shape,
73          offx, offy = self.offset                      draw_polygon_init(layer.ShapeStore().Shapefile(),
74          return draw_polygon_init(layer.shapefile, self.dc,                                        self.dc, self.map.projection,
75                                   self.map.projection,                                        layer.projection,
76                                   layer.projection,                                        self.scale, -self.scale, offx, offy))
                                  self.scale, -self.scale,  
                                  offx, offy)  
   
     def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):  
         draw_polygon_shape(draw_polygon_info, index, pen, brush)  
   
     def projected_points(self, layer, index):  
         proj = self.map.GetProjection()  
         if proj is not None:  
             forward = proj.Forward  
77          else:          else:
78              forward = None              return BaseRenderer.low_level_renderer(self, layer)
         proj = layer.GetProjection()  
         if proj is not None:  
             inverse = proj.Inverse  
         else:  
             inverse = None  
         shape = layer.Shape(index)  
         points = []  
         scale = self.scale  
         offx, offy = self.offset  
         for x, y in shape.Points():  
             if inverse:  
                 x, y = inverse(x, y)  
             if forward:  
                 x, y = forward(x, y)  
             points.append(wxPoint(x * scale + offx,  
                                   -y * scale + offy))  
         return points  
   
     def draw_arc_shape(self, layer, index):  
         points = self.projected_points(layer, index)  
         self.dc.DrawLines(points)  
   
     def draw_point_shape(self, layer, index):  
         pp = self.projected_points(layer, index)  
   
         if len(pp) == 0: return # ignore Null Shapes which have no points  
   
         p = pp[0]  
         radius = self.resolution * 5  
         self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)  
79    
80      def draw_label_layer(self, layer):      def label_font(self):
81          scale = self.scale          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
         offx, offy = self.offset  
82    
83          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)      def draw_raster_data(self, data):
84          self.dc.SetFont(font)          stream = cStringIO.StringIO(data)
85            image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
86          map_proj = self.map.projection          bitmap = wxBitmapFromImage(image)
87          if map_proj is not None:          self.dc.DrawBitmap(bitmap, 0, 0)
             forward = map_proj.Forward  
         else:  
             forward = None  
   
         for label in layer.Labels():  
             x = label.x  
             y = label.y  
             text = label.text  
             if forward:  
                 x, y = forward(x, y)  
             x = x * scale + offx  
             y = -y * scale + offy  
             width, height = self.dc.GetTextExtent(text)  
             if label.halign == ALIGN_LEFT:  
                 # nothing to be done  
                 pass  
             elif label.halign == ALIGN_RIGHT:  
                 x = x - width  
             elif label.halign == ALIGN_CENTER:  
                 x = x - width/2  
             if label.valign == ALIGN_TOP:  
                 # nothing to be done  
                 pass  
             elif label.valign == ALIGN_BOTTOM:  
                 y = y - height  
             elif label.valign == ALIGN_CENTER:  
                 y = y - height/2  
             self.dc.DrawText(text, x, y)  
88    
89    
90  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
91    
92      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
93      honor_visibility = 1      honor_visibility = 1
94        
95      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, map, region, selected_layer, selected_shapes):
96          """Render the map.          """Render the map.
97    
# Line 270  class ScreenRenderer(MapRenderer): Line 112  class ScreenRenderer(MapRenderer):
112              brush = wxBrush(wxBLACK, wxCROSS_HATCH)              brush = wxBrush(wxBLACK, wxCROSS_HATCH)
113    
114              shapetype = layer.ShapeType()              shapetype = layer.ShapeType()
115              if shapetype == SHAPETYPE_POLYGON:              useraw, func, param = self.low_level_renderer(layer)
116                  offx, offy = self.offset              args = (pen, brush)
                 renderparam = self.polygon_render_param(layer)  
                 func = self.draw_polygon_shape  
                 args = (pen, brush)  
             elif shapetype == SHAPETYPE_ARC:  
                 renderparam = self.polygon_render_param(layer)  
                 func = self.draw_polygon_shape  
                 args = (pen, None)  
             elif shapetype == SHAPETYPE_POINT:  
                 renderparam = layer  
                 self.dc.SetBrush(brush)  
                 self.dc.SetPen(pen)  
                 func = self.draw_point_shape  
                 args = ()  
             else:  
                 raise TypeError(_("Unhandled shape type %s") % shapetype)  
   
117              for index in self.selected_shapes:              for index in self.selected_shapes:
118                  func(renderparam, index, *args)                  shape = layer.Shape(index)
119                    if useraw:
120                        data = shape.RawData()
121                    else:
122                        data = shape.Points()
123                    func(param, data, *args)
124    
125      def layer_ids(self, layer):      def layer_shapes(self, layer):
126          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
127    
128          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 333  class ScreenRenderer(MapRenderer): Line 163  class ScreenRenderer(MapRenderer):
163  class ExportRenderer(ScreenRenderer):  class ExportRenderer(ScreenRenderer):
164    
165      honor_visibility = 1      honor_visibility = 1
166        
167      def RenderMap(self, map, region, mapregion,      def RenderMap(self, map, region, mapregion,
168                    selected_layer, selected_shapes ):                    selected_layer, selected_shapes ):
169          """Render the map.          """Render the map.
170    
171          The rendering device has been specified during initialisation.          The rendering device has been specified during initialisation.
172          The device border distance was set in Thuban.UI.view.OutputTranform().          The device border distance was set in Thuban.UI.view.OutputTranform().
173            
174          RenderMap renders a frame set (one page frame, one around          RenderMap renders a frame set (one page frame, one around
175          legend/scalebar and one around the map), the map, the legend and the          legend/scalebar and one around the map), the map, the legend and the
176          scalebar on the given DC. The map is rendered with the region displayed          scalebar on the given DC. The map is rendered with the region displayed
177          in the canvas view, centered on the area available for map display.          in the canvas view, centered on the area available for map display.
178          """          """
179            
180          self.update_region = region          self.update_region = region
181          self.selected_layer = selected_layer          self.selected_layer = selected_layer
182          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
183    
184          # Get some dimensions          # Get some dimensions
185          llx, lly, urx, ury = region          llx, lly, urx, ury = region
186          self.mapregion = mapregion          self.mapregion = mapregion
187          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.mapregion
188    
189          # Manipulate the offset to position the map          # Manipulate the offset to position the map
190          offx, offy = self.offset          offx, offy = self.offset
191          # 1. Shift to corner of map drawing area          # 1. Shift to corner of map drawing area
192          offx = offx + mminx          offx = offx + mminx
193          offy = offy + mminy          offy = offy + mminy
194    
195          # 2. Center the map on the map drawing area:          # 2. Center the map on the map drawing area:
196          # region identifies the region on the canvas view:          # region identifies the region on the canvas view:
197          # center of map drawing area - half the size of region: rendering origin          # center of map drawing area - half the size of region: rendering origin
198          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
199          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
# Line 373  class ExportRenderer(ScreenRenderer): Line 203  class ExportRenderer(ScreenRenderer):
203          # Draw the map          # Draw the map
204          self.dc.BeginDrawing()          self.dc.BeginDrawing()
205          self.dc.DestroyClippingRegion()          self.dc.DestroyClippingRegion()
206          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
207                                    urx, ury)                                    urx, ury)
208          self.render_map(map)          self.render_map(map)
209          self.dc.EndDrawing()          self.dc.EndDrawing()
# Line 404  class ExportRenderer(ScreenRenderer): Line 234  class ExportRenderer(ScreenRenderer):
234    
235          # Page Frame          # Page Frame
236          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
237            
238          # Map Frame          # Map Frame
239          llx, lly, urx, ury = region          llx, lly, urx, ury = region
240          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
241            
242          # Legend Frame          # Legend Frame
243          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
244    
# Line 432  class ExportRenderer(ScreenRenderer): Line 262  class ExportRenderer(ScreenRenderer):
262          iconheight = textheight          iconheight = textheight
263          stepy = textheight+3          stepy = textheight+3
264          dx = 10          dx = 10
265          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
266                                  # 5 pix inside legend frame                                  # 5 pix inside legend frame
267          posy = mminy + 5        # 5 pix inside legend frame          posy = mminy + 5        # 5 pix inside legend frame
268            
269          # Render the legend          # Render the legend
270          dc.SetTextForeground(wxBLACK)          dc.SetTextForeground(wxBLACK)
271          if map.HasLayers():          if map.HasLayers():
272              for l in map.Layers():              layers = map.Layers()[:]
273                layers.reverse()
274                for l in layers:
275                  if l.Visible():                  if l.Visible():
276                      # Render title                      # Render title
277                      dc.DrawText(l.Title(), posx, posy)                      dc.DrawText(l.Title(), posx, posy)
278                      posy+=stepy                      posy+=stepy
279                      # Render classification                      if l.HasClassification():
280                      clazz = l.GetClassification()                          # Render classification
281                      shapeType = l.ShapeType()                          clazz = l.GetClassification()
282                      for g in clazz:                          shapeType = l.ShapeType()
283                          if g.IsVisible():                          for g in clazz:
284                              previewer.Draw(dc,                              if g.IsVisible():
285                                  wxRect(posx+dx, posy, iconwidth, iconheight),                                  previewer.Draw(dc,
286                                  g.GetProperties(), shapeType)                                      wxRect(posx+dx, posy,
287                              dc.DrawText(g.GetDisplayText(),                                             iconwidth, iconheight),
288                                          posx+2*dx+iconwidth, posy)                                      g.GetProperties(), shapeType)
289                              posy+=stepy                                  dc.DrawText(g.GetDisplayText(),
290                                                        posx+2*dx+iconwidth, posy)
291                                    posy+=stepy
292    
293      def render_scalebar(self, map):      def render_scalebar(self, map):
294          """Render the scalebar."""          """Render the scalebar."""
295    
# Line 464  class ExportRenderer(ScreenRenderer): Line 298  class ExportRenderer(ScreenRenderer):
298          # Dimension stuff          # Dimension stuff
299          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
300          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.mapregion
301          
302          # Render the scalebar          # Render the scalebar
303          scalebar.DrawScaleBar(self.scale, self.dc,          scalebar.DrawScaleBar(self.scale, self.dc,
304                               (mmaxx+10+5, mmaxy-25),                               (mmaxx+10+5, mmaxy-25),
305                               ((width-15-5) - (mmaxx+10+5),20)                               ((width-15-5) - (mmaxx+10+5),20)
306                              )                              )
Legend:
Removed from v.909  
changed lines
  Added in v.1750
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