/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 535 by bh, Fri Mar 14 20:42:18 2003 UTC revision 1937 by bh, Tue Nov 11 18:16:42 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__ = "$Revision$"  from __future__ import generators
11    
12  from wxPython.wx import wxPoint, wxPen, wxBrush, wxFont, \  __version__ = "$Revision$"
13       wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  # $Source$
14       wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  # $Id$
15    
16  from wxproj import draw_polygon_shape  import cStringIO
17    
18  from Thuban import _  from Thuban import _
 from Thuban.UI.common import *  
   
 from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  
      SHAPETYPE_POINT  
 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  
19    
20    from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
21        wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
22        wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
23        wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, wxBITMAP_TYPE_JPEG
24    
25  class MapRenderer:  from wxproj import draw_polygon_shape, draw_polygon_init
26    
27      """Class to render a map onto a wxDC"""  from Thuban.UI.common import Color2wxColour
28    from Thuban.UI.classifier import ClassDataPreviewer
29      honor_visibility = 1  from Thuban.UI.scalebar import ScaleBar
30    
31      def __init__(self, dc, scale, offset, resolution = 72.0,  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
32                   honor_visibility = None):       SHAPETYPE_POINT, RAW_SHAPEFILE
         """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  
         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())  
33    
34      def draw_shape_layer(self, layer):  from Thuban.Model.color import Transparent
35          scale = self.scale  import Thuban.Model.resource
         offx, offy = self.offset  
36    
37          map_proj = self.map.projection  from baserenderer import BaseRenderer
         layer_proj = layer.projection  
38    
         shapetype = layer.ShapeType()  
39    
40          brush = wxTRANSPARENT_BRUSH  # Map the strings used for the format parameter of the draw_raster_data
41          pen   = wxTRANSPARENT_PEN  # method to the appropriate wxWindows constants
42    raster_format_map = {
43        "BMP": wxBITMAP_TYPE_BMP,
44        "JPEG": wxBITMAP_TYPE_JPEG,
45        }
46    
47          old_prop = None  class MapRenderer(BaseRenderer):
         lc = layer.GetClassification()  
         field = lc.GetField()  
   
         defaultProps = lc.GetDefaultGroup().GetProperties()  
   
         for i in self.layer_ids(layer):  
             value = None  
   
             if field is not None:  
                 try:  
                     record = layer.table.read_record(i)  
                     if record is not None:  
                         value = record[field]  
                 except:  
                     pass  
   
                 #  
                 # if the above statements fail 'value' should  
                 # be null, at which point this call will  
                 # at least retreive the NullData  
                 #  
                 prop = lc.GetProperties(value)  
             else:  
                 prop = defaultProps  
48    
49              # don't recreate new objects if they are the same as before      """Class to render a map onto a wxDC"""
             if prop != old_prop:  
                 old_prop = prop  
   
                 if shapetype == SHAPETYPE_ARC:  
                     fill = Color.None  
                 else:  
                     fill = prop.GetFill()  
       
                 if fill is Color.None:  
                     brush = wxTRANSPARENT_BRUSH  
                 else:  
                     color = Color2wxColour(fill)  
                     brush = wxBrush(color, wxSOLID)  
       
                 stroke = prop.GetLineColor()  
                 stroke_width = prop.GetLineWidth()  
                 if stroke is Color.None:  
                     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)  
                 self.draw_point_shape(layer, i)  
             else:  
                 self.draw_polygon_shape(layer, i, pen, brush)  
50    
51      def layer_ids(self, layer):      TRANSPARENT_PEN = wxTRANSPARENT_PEN
52          """Return the shape ids of the given layer that have to be drawn.      TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
           
         The default implementation simply returns all ids in the layer.  
         Override in derived classes to be more precise.  
         """  
         return range(layer.NumShapes())  
53    
54      def draw_polygon_shape(self, layer, index, pen, brush):      def make_point(self, x, y):
55          offx, offy = self.offset                  return wxPoint(int(round(x)), int(round(y)))
         draw_polygon_shape(layer.shapefile.cobject(), index,  
                            self.dc, pen, brush,  
                            self.map.projection, layer.projection,  
                            self.scale, -self.scale, offx, offy)  
56    
57      def projected_points(self, layer, index):      def tools_for_property(self, prop):
58          proj = self.map.projection          fill = prop.GetFill()
59          if proj is not None:          if fill is Transparent:
60              forward = proj.Forward              brush = self.TRANSPARENT_BRUSH
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
             inverse = proj.Inverse  
61          else:          else:
62              inverse = None              brush = wxBrush(Color2wxColour(fill), wxSOLID)
         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):  
         p = self.projected_points(layer, index)[0]  
         radius = self.resolution * 5  
         self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)  
63    
64      def draw_label_layer(self, layer):          stroke = prop.GetLineColor()
65          scale = self.scale          if stroke is Transparent:
66          offx, offy = self.offset              pen = self.TRANSPARENT_PEN
67            else:
68                pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
69            return pen, brush
70    
71          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)      def low_level_renderer(self, layer):
72          self.dc.SetFont(font)          """Override inherited method to provide more efficient renderers
73    
74          map_proj = self.map.projection          If the underlying data format is not a shapefile or the layer
75          if map_proj is not None:          contains points shapes, simply use what the inherited method
76              forward = map_proj.Forward          returns.
77    
78            Otherwise, i.e. for arc and polygon use the more efficient
79            wxproj.draw_polygon_shape and its corresponding parameter
80            created with wxproj.draw_polygon_init.
81            """
82            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
83                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
84                offx, offy = self.offset
85                return (True, draw_polygon_shape,
86                        draw_polygon_init(layer.ShapeStore().Shapefile(),
87                                          self.dc, self.map.projection,
88                                          layer.projection,
89                                          self.scale, -self.scale, offx, offy))
90          else:          else:
91              forward = None              return BaseRenderer.low_level_renderer(self, layer)
92    
93          for label in layer.Labels():      def label_font(self):
94              x = label.x          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
95              y = label.y                        wxNORMAL)
96              text = label.text  
97              if forward:      def draw_raster_data(self, data, format = 'BMP'):
98                  x, y = forward(x, y)          stream = cStringIO.StringIO(data)
99              x = x * scale + offx          image = wxImageFromStream(stream, raster_format_map[format])
100              y = -y * scale + offy          bitmap = wxBitmapFromImage(image)
101              width, height = self.dc.GetTextExtent(text)          self.dc.DrawBitmap(bitmap, 0, 0)
             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)  
102    
103    
104  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
105    
106      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
107      honor_visibility = 1      honor_visibility = 1
108        
109      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, selected_layer, selected_shapes):
110          """Render the map.          """Render the map.
111    
112          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
# Line 234  class ScreenRenderer(MapRenderer): Line 114  class ScreenRenderer(MapRenderer):
114          shapes given by the ids in selected_shapes in the          shapes given by the ids in selected_shapes in the
115          selected_layer.          selected_layer.
116          """          """
         self.update_region = region  
117          self.selected_layer = selected_layer          self.selected_layer = selected_layer
118          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
119          self.render_map(map)          self.render_map()
120    
121      def draw_shape_layer(self, layer):      def RenderMapIncrementally(self):
122          MapRenderer.draw_shape_layer(self, layer)          """Render the map.
123          if layer is self.selected_layer and self.selected_shapes:  
124              pen = wxPen(wxBLACK, 3, wxSOLID)          Only the given region (a tuple in window coordinates as returned
125              brush = wxBrush(wxBLACK, wxCROSS_HATCH)          by a wxrect's asTuple method) needs to be redrawn. Highlight the
126            shapes given by the ids in selected_shapes in the
127              shapetype = layer.ShapeType()          selected_layer.
128              if shapetype == SHAPETYPE_POLYGON:          """
129                  func = self.draw_polygon_shape          return self.render_map_incrementally()
130                  args = (pen, brush)  
131              elif shapetype == SHAPETYPE_ARC:      def draw_selection_incrementally(self, layer, selected_shapes):
132                  func = self.draw_polygon_shape          pen = wxPen(wxBLACK, 3, wxSOLID)
133                  args = (pen, None)          brush = wxBrush(wxBLACK, wxCROSS_HATCH)
             elif shapetype == SHAPETYPE_POINT:  
                 self.dc.SetBrush(brush)  
                 self.dc.SetPen(pen)  
                 func = self.draw_point_shape  
                 args = ()  
             else:  
                 raise TypeError(_("Unhandled shape type %s") % shapetype)  
134    
135              for index in self.selected_shapes:          shapetype = layer.ShapeType()
136                  func(layer, index, *args)          useraw, func, param = self.low_level_renderer(layer)
137            args = (pen, brush)
138            count = 0
139            for index in selected_shapes:
140                count += 1
141                shape = layer.Shape(index)
142                if useraw:
143                    data = shape.RawData()
144                else:
145                    data = shape.Points()
146                func(param, data, *args)
147                if count % 500 == 0:
148                    yield True
149    
150      def layer_ids(self, layer):      def layer_shapes(self, layer):
151          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
152    
153          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 284  class ScreenRenderer(MapRenderer): Line 168  class ScreenRenderer(MapRenderer):
168          offx, offy = self.offset          offx, offy = self.offset
169          xs = []          xs = []
170          ys = []          ys = []
171          x, y, width, height = self.update_region          x, y, width, height = self.region
172          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
173                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
174              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 301  class ScreenRenderer(MapRenderer): Line 185  class ScreenRenderer(MapRenderer):
185          return layer.ShapesInRegion((left, bottom, right, top))          return layer.ShapesInRegion((left, bottom, right, top))
186    
187    
188  class PrinterRender(MapRenderer):  class ExportRenderer(ScreenRenderer):
189    
190        honor_visibility = 1
191    
192        def __init__(self, *args, **kw):
193            """Initialize the ExportRenderer.
194    
195            In addition to all parameters of the the ScreenRender
196            constructor, this class requires and additional keyword argument
197            destination_region with a tuple (minx, miny, maxx, maxy) giving
198            the region in dc coordinates which is to contain the map.
199            """
200            self.destination_region = kw["destination_region"]
201            del kw["destination_region"]
202            ScreenRenderer.__init__(self, *args, **kw)
203    
204      # When printing we want to see all layers      def RenderMap(self, selected_layer, selected_shapes):
205      honor_visibility = 0          """Render the map.
206    
207            The rendering device has been specified during initialisation.
208            The device border distance was set in
209            Thuban.UI.viewport.output_transform().
210    
211            RenderMap renders a frame set (one page frame, one around
212            legend/scalebar and one around the map), the map, the legend and
213            the scalebar on the given DC. The map is rendered with the
214            region displayed in the canvas view, centered on the area
215            available for map display.
216            """
217    
218            self.selected_layer = selected_layer
219            self.selected_shapes = selected_shapes
220    
221            # Get some dimensions
222            llx, lly, urx, ury = self.region
223            mminx, mminy, mmaxx, mmaxy = self.destination_region
224    
225            # Manipulate the offset to position the map
226            offx, offy = self.offset
227            # 1. Shift to corner of map drawing area
228            offx = offx + mminx
229            offy = offy + mminy
230    
231            # 2. Center the map on the map drawing area:
232            # region identifies the region on the canvas view:
233            # center of map drawing area - half the size of region: rendering origin
234            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
235            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
236    
237            self.offset = (offx+self.shiftx, offy+self.shifty)
238    
239            # Draw the map
240            self.dc.BeginDrawing()
241            self.dc.DestroyClippingRegion()
242            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
243                                      urx, ury)
244            self.render_map()
245            self.dc.EndDrawing()
246    
247            # Draw the rest (frames, legend, scalebar)
248            self.dc.BeginDrawing()
249            self.dc.DestroyClippingRegion()
250    
251            # Force the font for Legend drawing
252            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
253            self.dc.SetFont(font)
254    
255            self.render_frame()
256            self.render_legend()
257            self.render_scalebar()
258            self.dc.EndDrawing()
259    
260        def render_frame(self):
261            """Render the frames for map and legend/scalebar."""
262    
263            dc = self.dc
264            dc.SetPen(wxBLACK_PEN)
265            dc.SetBrush(wxTRANSPARENT_BRUSH)
266    
267            # Dimension stuff
268            width, height = dc.GetSizeTuple()
269            mminx, mminy, mmaxx, mmaxy = self.destination_region
270    
271            # Page Frame
272            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
273    
274            # Map Frame
275            llx, lly, urx, ury = self.region
276            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
277    
278            # Legend Frame
279            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
280    
281            dc.DestroyClippingRegion()
282            dc.SetClippingRegion(mmaxx+10,mminy,
283                                 (width-20) - (mmaxx+10), mmaxy-mminy)
284    
285        def render_legend(self):
286            """Render the legend on the Map."""
287    
288            previewer = ClassDataPreviewer()
289            dc = self.dc
290            dc.SetPen(wxBLACK_PEN)
291            dc.SetBrush(wxTRANSPARENT_BRUSH)
292    
293            # Dimension stuff
294            width, height = dc.GetSizeTuple()
295            mminx, mminy, mmaxx, mmaxy = self.destination_region
296            textwidth, textheight = dc.GetTextExtent("0")
297            iconwidth  = textheight
298            iconheight = textheight
299            stepy = textheight+3
300            dx = 10
301            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
302                                    # 5 pix inside legend frame
303            posy = mminy + 5        # 5 pix inside legend frame
304    
305            # Render the legend
306            dc.SetTextForeground(wxBLACK)
307            if self.map.HasLayers():
308                layers = self.map.Layers()[:]
309                layers.reverse()
310                for l in layers:
311                    if l.Visible():
312                        # Render title
313                        dc.DrawText(l.Title(), posx, posy)
314                        posy+=stepy
315                        if l.HasClassification():
316                            # Render classification
317                            clazz = l.GetClassification()
318                            shapeType = l.ShapeType()
319                            for g in clazz:
320                                if g.IsVisible():
321                                    previewer.Draw(dc,
322                                        wxRect(posx+dx, posy,
323                                               iconwidth, iconheight),
324                                        g.GetProperties(), shapeType)
325                                    dc.DrawText(g.GetDisplayText(),
326                                                posx+2*dx+iconwidth, posy)
327                                    posy+=stepy
328    
329        def render_scalebar(self):
330            """Render the scalebar."""
331    
332            scalebar = ScaleBar(self.map)
333    
334            # Dimension stuff
335            width, height = self.dc.GetSizeTuple()
336            mminx, mminy, mmaxx, mmaxy = self.destination_region
337    
338            # Render the scalebar
339            scalebar.DrawScaleBar(self.scale, self.dc,
340                                 (mmaxx+10+5, mmaxy-25),
341                                 ((width-15-5) - (mmaxx+10+5),20)
342                                )
343            # 10 pix between map and legend frame, 5 pix inside legend frame
344            # 25 pix from the legend frame bottom line
345            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
346            # Height: 20
347    
348    class PrinterRenderer(ExportRenderer):
349    
350        # Printing as well as Export / Screen display only the visible layer.
351        honor_visibility = 1
352    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.535  
changed lines
  Added in v.1937
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