/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 938 by jonathan, Tue May 20 15:25:10 2003 UTC revision 1552 by bh, Wed Aug 6 17:21:32 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
 from gdalwarp import ProjectRasterFile  
22    
23  from Thuban.UI.common import Color2wxColour  from Thuban.UI.common import Color2wxColour
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, SHAPETYPE_POINT
      SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
28    
29  from Thuban.Model.classification import Classification  from Thuban.Model.color import Transparent
30  from Thuban.Model.color import Color  import Thuban.Model.resource
31    
32  class MapRenderer:  from baserenderer import BaseRenderer
33    
34      """Class to render a map onto a wxDC"""  class MapRenderer(BaseRenderer):
   
     honor_visibility = 1  
   
     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  
   
         #  
         # This is only a good optimization if there is only one  
         # raster layer and the image covers the entire window (as  
         # it currently does).  
         #  
         for layer in map.Layers():  
             if isinstance(layer, RasterLayer):  
                 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):  
                     self.draw_raster_layer(layer)  
                     seenRaster = True  
   
         self.draw_label_layer(map.LabelLayer())  
   
     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()  
35    
36          brush = wxTRANSPARENT_BRUSH      """Class to render a map onto a wxDC"""
         pen   = wxTRANSPARENT_PEN  
   
         old_prop = None  
         old_group = None  
         lc = layer.GetClassification()  
         field = lc.GetField()  
         defaultGroup = lc.GetDefaultGroup()  
37    
38        TRANSPARENT_PEN = wxTRANSPARENT_PEN
39        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
40    
41          if shapetype != SHAPETYPE_POINT:      make_point = wxPoint
             polygon_render_param = self.polygon_render_param(layer)  
42    
43          if shapetype == SHAPETYPE_POINT:      def tools_for_property(self, prop):
44              draw_func = lambda i: \          fill = prop.GetFill()
45                     self.draw_point_shape(layer, i)          if fill is Transparent:
46                brush = self.TRANSPARENT_BRUSH
47          else:          else:
48              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):  
   
             if field is None:  
                 group = defaultGroup  
             else:  
                 record = layer.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 = 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)  
   
     def draw_raster_layer(self, layer):  
         data = None  
         offx, offy = self.offset  
         width, height = self.dc.GetSizeTuple()  
   
         inProj = ""  
         proj = layer.GetProjection()  
         if proj is not None:  
             for p in proj.GetAllParameters():  
                 inProj += "+" + p + " "  
   
         outProj = ""  
         proj = self.map.GetProjection()  
         if proj is not None:  
             for p in proj.GetAllParameters():  
                 outProj += "+" + p + " "  
49    
50          print "self.scale: ", self.scale, offx, offy, width, height          stroke = prop.GetLineColor()
51          xmin = (0 - offx) / self.scale          if stroke is Transparent:
52          ymin = (offy - height) / self.scale              pen = self.TRANSPARENT_PEN
         xmax = (width - offx) / self.scale  
         ymax = (offy - 0) / self.scale  
   
         try:  
             data = ProjectRasterFile(  
                 layer.GetImageFilename(),  
                 inProj,  
                 outProj,  
                 str(xmin), str(ymin), str(xmax), str(ymax),  
                 "", str(width), str(height));  
         except (AttributeError, IOError, ValueError):  
             pass  
53          else:          else:
54              if data is not None:              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
55                  stream = cStringIO.StringIO(data)          return pen, brush
                 image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)  
                 bitmap = wxBitmapFromImage(image)  
                 self.dc.BeginDrawing()  
                 self.dc.DrawBitmap(bitmap, 0, 0)  
                 self.dc.EndDrawing()  
56    
57      def layer_ids(self, layer):      def low_level_renderer(self, layer):
58          """Return the shape ids of the given layer that have to be drawn.          """Override inherited method to provide more efficient renderers
59    
60          The default implementation simply returns all ids in the layer.          For point shapes, return self.draw_point_shape and layer just as
61          Override in derived classes to be more precise.          the base class method. For arc and polygon use the more
62            efficient wxproj.draw_polygon_shape and its corresponding
63            parameter created with wxproj.draw_polygon_init.
64          """          """
65          return range(layer.NumShapes())          shapetype = layer.ShapeType()
66            if shapetype == SHAPETYPE_POINT:
67      def polygon_render_param(self, layer):              func = self.draw_point_shape
68          """Return the low-lever render parameter for the layer"""              param = layer
         offx, offy = self.offset  
         return draw_polygon_init(layer.shapefile, self.dc,  
                                  self.map.projection,  
                                  layer.projection,  
                                  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  
         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)  
   
     def draw_label_layer(self, layer):  
         scale = self.scale  
         offx, offy = self.offset  
   
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
   
         map_proj = self.map.projection  
         if map_proj is not None:  
             forward = map_proj.Forward  
69          else:          else:
70              forward = None              offx, offy = self.offset
71                param = draw_polygon_init(layer.ShapeStore().Shapefile(), self.dc,
72          for label in layer.Labels():                                        self.map.projection,
73              x = label.x                                        layer.projection,
74              y = label.y                                        self.scale, -self.scale,
75              text = label.text                                        offx, offy)
76              if forward:              func = draw_polygon_shape
77                  x, y = forward(x, y)          return func, param
78              x = x * scale + offx  
79              y = -y * scale + offy      def label_font(self):
80              width, height = self.dc.GetTextExtent(text)          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
81              if label.halign == ALIGN_LEFT:  
82                  # nothing to be done      def draw_raster_data(self, data):
83                  pass          stream = cStringIO.StringIO(data)
84              elif label.halign == ALIGN_RIGHT:          image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
85                  x = x - width          bitmap = wxBitmapFromImage(image)
86              elif label.halign == ALIGN_CENTER:          self.dc.DrawBitmap(bitmap, 0, 0)
                 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)  
87    
88    
89  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
90    
91      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
92      honor_visibility = 1      honor_visibility = 1
93        
94      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, map, region, selected_layer, selected_shapes):
95          """Render the map.          """Render the map.
96    
# Line 334  class ScreenRenderer(MapRenderer): Line 111  class ScreenRenderer(MapRenderer):
111              brush = wxBrush(wxBLACK, wxCROSS_HATCH)              brush = wxBrush(wxBLACK, wxCROSS_HATCH)
112    
113              shapetype = layer.ShapeType()              shapetype = layer.ShapeType()
114              if shapetype == SHAPETYPE_POLYGON:              func, param = self.low_level_renderer(layer)
115                  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)  
   
116              for index in self.selected_shapes:              for index in self.selected_shapes:
117                  func(renderparam, index, *args)                  func(param, index, *args)
   
118    
119      def layer_ids(self, layer):      def layer_ids(self, layer):
120          """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 397  class ScreenRenderer(MapRenderer): Line 157  class ScreenRenderer(MapRenderer):
157  class ExportRenderer(ScreenRenderer):  class ExportRenderer(ScreenRenderer):
158    
159      honor_visibility = 1      honor_visibility = 1
160        
161      def RenderMap(self, map, region, mapregion,      def RenderMap(self, map, region, mapregion,
162                    selected_layer, selected_shapes ):                    selected_layer, selected_shapes ):
163          """Render the map.          """Render the map.
164    
165          The rendering device has been specified during initialisation.          The rendering device has been specified during initialisation.
166          The device border distance was set in Thuban.UI.view.OutputTranform().          The device border distance was set in Thuban.UI.view.OutputTranform().
167            
168          RenderMap renders a frame set (one page frame, one around          RenderMap renders a frame set (one page frame, one around
169          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
170          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
171          in the canvas view, centered on the area available for map display.          in the canvas view, centered on the area available for map display.
172          """          """
173            
174          self.update_region = region          self.update_region = region
175          self.selected_layer = selected_layer          self.selected_layer = selected_layer
176          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
177    
178          # Get some dimensions          # Get some dimensions
179          llx, lly, urx, ury = region          llx, lly, urx, ury = region
180          self.mapregion = mapregion          self.mapregion = mapregion
181          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.mapregion
182    
183          # Manipulate the offset to position the map          # Manipulate the offset to position the map
184          offx, offy = self.offset          offx, offy = self.offset
185          # 1. Shift to corner of map drawing area          # 1. Shift to corner of map drawing area
186          offx = offx + mminx          offx = offx + mminx
187          offy = offy + mminy          offy = offy + mminy
188    
189          # 2. Center the map on the map drawing area:          # 2. Center the map on the map drawing area:
190          # region identifies the region on the canvas view:          # region identifies the region on the canvas view:
191          # center of map drawing area - half the size of region: rendering origin          # center of map drawing area - half the size of region: rendering origin
192          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
193          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
# Line 437  class ExportRenderer(ScreenRenderer): Line 197  class ExportRenderer(ScreenRenderer):
197          # Draw the map          # Draw the map
198          self.dc.BeginDrawing()          self.dc.BeginDrawing()
199          self.dc.DestroyClippingRegion()          self.dc.DestroyClippingRegion()
200          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
201                                    urx, ury)                                    urx, ury)
202          self.render_map(map)          self.render_map(map)
203          self.dc.EndDrawing()          self.dc.EndDrawing()
# Line 468  class ExportRenderer(ScreenRenderer): Line 228  class ExportRenderer(ScreenRenderer):
228    
229          # Page Frame          # Page Frame
230          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
231            
232          # Map Frame          # Map Frame
233          llx, lly, urx, ury = region          llx, lly, urx, ury = region
234          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
235            
236          # Legend Frame          # Legend Frame
237          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
238    
# Line 496  class ExportRenderer(ScreenRenderer): Line 256  class ExportRenderer(ScreenRenderer):
256          iconheight = textheight          iconheight = textheight
257          stepy = textheight+3          stepy = textheight+3
258          dx = 10          dx = 10
259          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
260                                  # 5 pix inside legend frame                                  # 5 pix inside legend frame
261          posy = mminy + 5        # 5 pix inside legend frame          posy = mminy + 5        # 5 pix inside legend frame
262            
263          # Render the legend          # Render the legend
264          dc.SetTextForeground(wxBLACK)          dc.SetTextForeground(wxBLACK)
265          if map.HasLayers():          if map.HasLayers():
266              for l in map.Layers():              layers = map.Layers()
267                layers.reverse()
268                for l in layers:
269                  if l.Visible():                  if l.Visible():
270                      # Render title                      # Render title
271                      dc.DrawText(l.Title(), posx, posy)                      dc.DrawText(l.Title(), posx, posy)
272                      posy+=stepy                      posy+=stepy
273                      # Render classification                      if l.HasClassification():
274                      clazz = l.GetClassification()                          # Render classification
275                      shapeType = l.ShapeType()                          clazz = l.GetClassification()
276                      for g in clazz:                          shapeType = l.ShapeType()
277                          if g.IsVisible():                          for g in clazz:
278                              previewer.Draw(dc,                              if g.IsVisible():
279                                  wxRect(posx+dx, posy, iconwidth, iconheight),                                  previewer.Draw(dc,
280                                  g.GetProperties(), shapeType)                                      wxRect(posx+dx, posy,
281                              dc.DrawText(g.GetDisplayText(),                                             iconwidth, iconheight),
282                                          posx+2*dx+iconwidth, posy)                                      g.GetProperties(), shapeType)
283                              posy+=stepy                                  dc.DrawText(g.GetDisplayText(),
284                                                        posx+2*dx+iconwidth, posy)
285                                    posy+=stepy
286    
287      def render_scalebar(self, map):      def render_scalebar(self, map):
288          """Render the scalebar."""          """Render the scalebar."""
289    
# Line 528  class ExportRenderer(ScreenRenderer): Line 292  class ExportRenderer(ScreenRenderer):
292          # Dimension stuff          # Dimension stuff
293          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
294          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.mapregion
295          
296          # Render the scalebar          # Render the scalebar
297          scalebar.DrawScaleBar(self.scale, self.dc,          scalebar.DrawScaleBar(self.scale, self.dc,
298                               (mmaxx+10+5, mmaxy-25),                               (mmaxx+10+5, mmaxy-25),
299                               ((width-15-5) - (mmaxx+10+5),20)                               ((width-15-5) - (mmaxx+10+5),20)
300                              )                              )
Legend:
Removed from v.938  
changed lines
  Added in v.1552
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