/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 1467 by jonathan, Tue Jul 22 14:02:57 2003 UTC revision 1562 by bh, Thu Aug 7 17:53:37 2003 UTC
# Line 13  import cStringIO Line 13  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, \      wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
19      wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \      wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP
     wxBitmap, wxImageFromBitmap, 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 27  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 Layer, RasterLayer, \  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
28       SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT       SHAPETYPE_POINT, RAW_SHAPEFILE
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
29    
 from Thuban.Model.classification import Classification  
30  from Thuban.Model.color import Transparent  from Thuban.Model.color import Transparent
31  import Thuban.Model.resource  import Thuban.Model.resource
32    
33  if Thuban.Model.resource.has_gdal_support():  from baserenderer import BaseRenderer
     from gdalwarp import ProjectRasterFile  
34    
35  class MapRenderer:  class MapRenderer(BaseRenderer):
36    
37      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
38    
39      honor_visibility = 1      TRANSPARENT_PEN = wxTRANSPARENT_PEN
40        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
     def __init__(self, dc, scale, offset, resolution = 72.0,  
                  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  
   
         self.dc = dc  
         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  
         seenRaster = True  
   
         self.dc.BeginDrawing()  
   
         #  
         # This is only a good optimization if there is only one  
         # raster layer and the image covers the entire window (as  
         # it currently does). We note if there is a raster layer  
         # and only begin drawing layers once we have drawn it.  
         # That way we avoid drawing layers that won't be seen.  
         #  
         if Thuban.Model.resource.has_gdal_support():  
             for layer in map.Layers():  
                 if isinstance(layer, RasterLayer) and layer.Visible():  
                     seenRaster = False  
                     break  
   
         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():  
                 if isinstance(layer, Layer) and seenRaster:  
                     self.draw_shape_layer(layer)  
                 elif isinstance(layer, RasterLayer) \  
                     and Thuban.Model.resource.has_gdal_support():  
                     self.draw_raster_layer(layer)  
                     seenRaster = True  
   
         self.draw_label_layer(map.LabelLayer())  
   
         self.dc.EndDrawing()  
   
     def draw_shape_layer(self, layer):  
         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 = layer.GetClassificationColumn()  
         defaultGroup = lc.GetDefaultGroup()  
41    
42        make_point = wxPoint
43    
44        def tools_for_property(self, prop):
45          if shapetype == SHAPETYPE_POINT:          fill = prop.GetFill()
46              draw_func = self.draw_point_shape          if fill is Transparent:
47              draw_func_param = layer              brush = self.TRANSPARENT_BRUSH
48          else:          else:
49              draw_func = draw_polygon_shape              brush = wxBrush(Color2wxColour(fill), wxSOLID)
             draw_func_param = self.polygon_render_param(layer)  
   
         table = layer.ShapeStore().Table()  
         for i in self.layer_ids(layer):  
   
             if field is None:  
                 group = defaultGroup  
             else:  
                 record = table.ReadRowAsDict(i)  
                 assert record is not None  
                 group = lc.FindGroup(record[field])  
   
   
             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 = Transparent  
                     else:  
                         fill = prop.GetFill()  
   
   
                     if fill is Transparent:  
                         brush = wxTRANSPARENT_BRUSH  
                     else:  
                         color = Color2wxColour(fill)  
                         brush = wxBrush(color, wxSOLID)  
   
                     stroke = prop.GetLineColor()  
                     stroke_width = prop.GetLineWidth()  
                     if stroke is Transparent:  
                         pen = wxTRANSPARENT_PEN  
                     else:  
                         color = Color2wxColour(stroke)  
                         pen = wxPen(color, stroke_width, wxSOLID)  
   
             draw_func(draw_func_param, i, pen, brush)  
   
     def draw_raster_layer(self, layer):  
         data = None  
         offx, offy = self.offset  
         width, height = self.dc.GetSizeTuple()  
50    
51          inProj = ""          stroke = prop.GetLineColor()
52          proj = layer.GetProjection()          if stroke is Transparent:
53          if proj is not None:              pen = self.TRANSPARENT_PEN
             for p in proj.GetAllParameters():  
                 inProj += "+" + p + " "  
   
         outProj = ""  
         proj = self.map.GetProjection()  
         if proj is not None:  
             for p in proj.GetAllParameters():  
                 outProj += "+" + p + " "  
   
         xmin = (0 - offx) / self.scale  
         ymin = (offy - height) / self.scale  
         xmax = (width - offx) / self.scale  
         ymax = (offy - 0) / self.scale  
   
         try:  
             data = ProjectRasterFile(  
                 layer.GetImageFilename(),  
                 inProj,  
                 outProj,  
                 (xmin, ymin, xmax, ymax),  
                 "", (width, height))  
         except IOError, (strerr):  
             print strerr  
         except (AttributeError, ValueError):  
             pass  
54          else:          else:
55              if data is not None:              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
56                  stream = cStringIO.StringIO(data)          return pen, brush
                 image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)  
                 bitmap = wxBitmapFromImage(image)  
                 self.dc.DrawBitmap(bitmap, 0, 0)  
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 (draw_polygon_shape,
73          offx, offy = self.offset                      draw_polygon_init(layer.ShapeStore().Shapefile(),
74          return draw_polygon_init(layer.ShapeStore().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  
         else:  
             forward = None  
         proj = layer.GetProjection()  
         if proj is not None:  
             inverse = proj.Inverse  
77          else:          else:
78              inverse = None              return BaseRenderer.low_level_renderer(self, layer)
         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, pen, brush):  
         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.SetBrush(brush)  
         self.dc.SetPen(pen)  
         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 341  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:              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 = (pen, brush)  
             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)                  func(param, index, *args)
119    
120      def layer_ids(self, layer):      def layer_ids(self, layer):
121          """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 403  class ScreenRenderer(MapRenderer): Line 158  class ScreenRenderer(MapRenderer):
158  class ExportRenderer(ScreenRenderer):  class ExportRenderer(ScreenRenderer):
159    
160      honor_visibility = 1      honor_visibility = 1
161        
162      def RenderMap(self, map, region, mapregion,      def RenderMap(self, map, region, mapregion,
163                    selected_layer, selected_shapes ):                    selected_layer, selected_shapes ):
164          """Render the map.          """Render the map.
165    
166          The rendering device has been specified during initialisation.          The rendering device has been specified during initialisation.
167          The device border distance was set in Thuban.UI.view.OutputTranform().          The device border distance was set in Thuban.UI.view.OutputTranform().
168            
169          RenderMap renders a frame set (one page frame, one around          RenderMap renders a frame set (one page frame, one around
170          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
171          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
172          in the canvas view, centered on the area available for map display.          in the canvas view, centered on the area available for map display.
173          """          """
174            
175          self.update_region = region          self.update_region = region
176          self.selected_layer = selected_layer          self.selected_layer = selected_layer
177          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
178    
179          # Get some dimensions          # Get some dimensions
180          llx, lly, urx, ury = region          llx, lly, urx, ury = region
181          self.mapregion = mapregion          self.mapregion = mapregion
182          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.mapregion
183    
184          # Manipulate the offset to position the map          # Manipulate the offset to position the map
185          offx, offy = self.offset          offx, offy = self.offset
186          # 1. Shift to corner of map drawing area          # 1. Shift to corner of map drawing area
187          offx = offx + mminx          offx = offx + mminx
188          offy = offy + mminy          offy = offy + mminy
189    
190          # 2. Center the map on the map drawing area:          # 2. Center the map on the map drawing area:
191          # region identifies the region on the canvas view:          # region identifies the region on the canvas view:
192          # center of map drawing area - half the size of region: rendering origin          # center of map drawing area - half the size of region: rendering origin
193          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
194          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
# Line 443  class ExportRenderer(ScreenRenderer): Line 198  class ExportRenderer(ScreenRenderer):
198          # Draw the map          # Draw the map
199          self.dc.BeginDrawing()          self.dc.BeginDrawing()
200          self.dc.DestroyClippingRegion()          self.dc.DestroyClippingRegion()
201          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
202                                    urx, ury)                                    urx, ury)
203          self.render_map(map)          self.render_map(map)
204          self.dc.EndDrawing()          self.dc.EndDrawing()
# Line 474  class ExportRenderer(ScreenRenderer): Line 229  class ExportRenderer(ScreenRenderer):
229    
230          # Page Frame          # Page Frame
231          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
232            
233          # Map Frame          # Map Frame
234          llx, lly, urx, ury = region          llx, lly, urx, ury = region
235          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
236            
237          # Legend Frame          # Legend Frame
238          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
239    
# Line 502  class ExportRenderer(ScreenRenderer): Line 257  class ExportRenderer(ScreenRenderer):
257          iconheight = textheight          iconheight = textheight
258          stepy = textheight+3          stepy = textheight+3
259          dx = 10          dx = 10
260          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
261                                  # 5 pix inside legend frame                                  # 5 pix inside legend frame
262          posy = mminy + 5        # 5 pix inside legend frame          posy = mminy + 5        # 5 pix inside legend frame
263            
264          # Render the legend          # Render the legend
265          dc.SetTextForeground(wxBLACK)          dc.SetTextForeground(wxBLACK)
266          if map.HasLayers():          if map.HasLayers():
# Line 522  class ExportRenderer(ScreenRenderer): Line 277  class ExportRenderer(ScreenRenderer):
277                          shapeType = l.ShapeType()                          shapeType = l.ShapeType()
278                          for g in clazz:                          for g in clazz:
279                              if g.IsVisible():                              if g.IsVisible():
280                                  previewer.Draw(dc,                                  previewer.Draw(dc,
281                                      wxRect(posx+dx, posy,                                      wxRect(posx+dx, posy,
282                                             iconwidth, iconheight),                                             iconwidth, iconheight),
283                                      g.GetProperties(), shapeType)                                      g.GetProperties(), shapeType)
284                                  dc.DrawText(g.GetDisplayText(),                                  dc.DrawText(g.GetDisplayText(),
285                                              posx+2*dx+iconwidth, posy)                                              posx+2*dx+iconwidth, posy)
286                                  posy+=stepy                                  posy+=stepy
287            
288      def render_scalebar(self, map):      def render_scalebar(self, map):
289          """Render the scalebar."""          """Render the scalebar."""
290    
# Line 538  class ExportRenderer(ScreenRenderer): Line 293  class ExportRenderer(ScreenRenderer):
293          # Dimension stuff          # Dimension stuff
294          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
295          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.mapregion
296          
297          # Render the scalebar          # Render the scalebar
298          scalebar.DrawScaleBar(self.scale, self.dc,          scalebar.DrawScaleBar(self.scale, self.dc,
299                               (mmaxx+10+5, mmaxy-25),                               (mmaxx+10+5, mmaxy-25),
300                               ((width-15-5) - (mmaxx+10+5),20)                               ((width-15-5) - (mmaxx+10+5),20)
301                              )                              )
Legend:
Removed from v.1467  
changed lines
  Added in v.1562
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