/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 1298 by jonathan, Tue Jun 24 18:00:26 2003 UTC revision 2587 by jonathan, Wed Mar 23 15:30:27 2005 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001-2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]> (2001-2003)
4  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]> (2003)
5  # Frank Koormann <[email protected]>  # Frank Koormann <[email protected]> (2003)
6    # Jan-Oliver Wagner <[email protected]> (2003, 2004)
7  #  #
8  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
9  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
10    
11    from __future__ import generators
12    
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    # $Source$
15    # $Id$
16    
17  import cStringIO  import cStringIO
18    
19    import array
20    
21  from Thuban import _  from Thuban import _
22    
23  from wxPython.wx import wxMemoryDC, wxEmptyBitmap, \  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
     wxPoint, wxRect, wxPen, wxBrush, wxFont, \  
24      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
25      wxBLACK_PEN, wxRED_PEN, wxBLACK, \      wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
26      wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \      wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, \
27      wxBitmap, wxImageFromBitmap, wxBitmapFromImage, \      wxBITMAP_TYPE_JPEG, wxBITMAP_TYPE_PNG, wxBITMAP_TYPE_TIF, \
28      wxImageFromStream, wxBITMAP_TYPE_BMP      wxBITMAP_TYPE_GIF, wxEmptyImage, wxMask, wxBitmapFromBits
29    
30  from wxproj import draw_polygon_shape, draw_polygon_init  from wxproj import draw_polygon_shape, draw_polygon_init
31    
# Line 27  from Thuban.UI.common import Color2wxCol Line 33  from Thuban.UI.common import Color2wxCol
33  from Thuban.UI.classifier import ClassDataPreviewer  from Thuban.UI.classifier import ClassDataPreviewer
34  from Thuban.UI.scalebar import ScaleBar  from Thuban.UI.scalebar import ScaleBar
35    
36  from Thuban.Model.layer import Layer, RasterLayer, \  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
37       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  
38    
39  from Thuban.Model.classification import Classification  from Thuban.Model.color import Transparent
 from Thuban.Model.color import Color  
40  import Thuban.Model.resource  import Thuban.Model.resource
41    
42  if Thuban.Model.resource.has_gdal_support():  from baserenderer import BaseRenderer
     from gdalwarp import ProjectRasterFile  
   
 class MapRenderer:  
   
     """Class to render a map onto a wxDC"""  
   
     honor_visibility = 1  
43    
44      def __init__(self, dc, scale, offset, resolution = 72.0,  from math import floor
                  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  
45    
46          self.dc = dc  from types import StringType
         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  
47    
48          if self.scale == 0:  from Thuban.version import versions
             return  
49    
50          #  if Thuban.Model.resource.has_gdal_support():
51          # This is only a good optimization if there is only one      from gdalwarp import ProjectRasterFile
         # 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())  
   
     def draw_shape_layer(self, layer):  
         scale = self.scale  
         offx, offy = self.offset  
52    
         map_proj = self.map.projection  
         layer_proj = layer.projection  
53    
54          shapetype = layer.ShapeType()  # Map the strings used for the format parameter of the draw_raster_data
55    # method to the appropriate wxWindows constants
56    raster_format_map = {
57        "BMP": wxBITMAP_TYPE_BMP,
58        "JPEG": wxBITMAP_TYPE_JPEG,
59        "PNG": wxBITMAP_TYPE_PNG,
60        "TIFF": wxBITMAP_TYPE_TIF,
61        "GIF": wxBITMAP_TYPE_GIF,
62        }
63    
64          brush = wxTRANSPARENT_BRUSH  class MapRenderer(BaseRenderer):
         pen   = wxTRANSPARENT_PEN  
65    
66          old_prop = None      """Class to render a map onto a wxDC"""
         old_group = None  
         lc = layer.GetClassification()  
         field = lc.GetField()  
         defaultGroup = lc.GetDefaultGroup()  
67    
68        TRANSPARENT_PEN = wxTRANSPARENT_PEN
69        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
70    
71          if shapetype != SHAPETYPE_POINT:      def make_point(self, x, y):
72              polygon_render_param = self.polygon_render_param(layer)          return wxPoint(int(round(x)), int(round(y)))
73    
74          if shapetype == SHAPETYPE_POINT:      def tools_for_property(self, prop):
75              draw_func = lambda i: \          fill = prop.GetFill()
76                     self.draw_point_shape(layer, i)          if fill is Transparent:
77                brush = self.TRANSPARENT_BRUSH
78          else:          else:
79              draw_func = lambda i: \              brush = wxBrush(Color2wxColour(fill), wxSOLID)
                    self.draw_polygon_shape(polygon_render_param, i, pen, brush)  
   
         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 = Color.Transparent  
                     else:  
                         fill = prop.GetFill()  
80    
81            stroke = prop.GetLineColor()
82            if stroke is Transparent:
83                pen = self.TRANSPARENT_PEN
84            else:
85                pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
86            return pen, brush
87    
88                      if fill is Color.Transparent:      def low_level_renderer(self, layer):
89                          brush = wxTRANSPARENT_BRUSH          """Override inherited method to provide more efficient renderers
                     else:  
                         color = Color2wxColour(fill)  
                         brush = wxBrush(color, wxSOLID)  
90    
91                      stroke = prop.GetLineColor()          If the underlying data format is not a shapefile or the layer
92                      stroke_width = prop.GetLineWidth()          contains points shapes, simply use what the inherited method
93                      if stroke is Color.Transparent:          returns.
94                          pen = wxTRANSPARENT_PEN  
95                      else:          Otherwise, i.e. for arc and polygon use the more efficient
96                          color = Color2wxColour(stroke)          wxproj.draw_polygon_shape and its corresponding parameter
97                          pen = wxPen(color, stroke_width, wxSOLID)          created with wxproj.draw_polygon_init.
98            """
99            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
100                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
101                offx, offy = self.offset
102                x = lambda a, b, c, d: None
103                #return (True, x, None)
104                return (True, draw_polygon_shape,
105                        draw_polygon_init(layer.ShapeStore().Shapefile(),
106                                          self.dc, self.map.projection,
107                                          layer.projection,
108                                          self.scale, -self.scale, offx, offy))
109            else:
110                return BaseRenderer.low_level_renderer(self, layer)
111    
112                      if shapetype == SHAPETYPE_POINT:      def label_font(self):
113                          self.dc.SetBrush(brush)          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
114                          self.dc.SetPen(pen)                        wxNORMAL)
115    
116              draw_func(i)      def projected_raster_layer(self, layer, srcProj, dstProj, extents,
117                                   resolution, dimensions, options):
118    
119      def draw_raster_layer(self, layer):          ret = None
         data = None  
         offx, offy = self.offset  
         width, height = self.dc.GetSizeTuple()  
120    
121          inProj = ""          if Thuban.Model.resource.has_gdal_support():
         proj = layer.GetProjection()  
         if proj is not None:  
             for p in proj.GetAllParameters():  
                 inProj += "+" + p + " "  
122    
123          outProj = ""              if versions['wxPython-tuple'] < (2,5,3):
124          proj = self.map.GetProjection()                  options = options | 4  # INVERT_MASK_BITS
125          if proj is not None:                  options = options & ~2 # ALPHA_MASK not supported
126              for p in proj.GetAllParameters():  
127                  outProj += "+" + p + " "              try:
128                    ret = ProjectRasterFile(layer.GetImageFilename(),
129                                            srcProj, dstProj,
130                                            extents, resolution, dimensions,
131                                            options)
132                except (MemoryError, IOError, AttributeError, ValueError):
133                    # Why does this catch AttributeError and ValueError?
134                    # FIXME: The exception should be communicated to the user
135                    # better.
136                    traceback.print_exc()
137    
138            return ret
139    
140        def draw_raster_data(self, layer, x,y, data, format = 'BMP'):
141    
142            mask = None
143            alpha = None
144            width = data[0]
145            height = data[1]
146            image_data, mask_data, alpha_data = data[2]
147    
148            if versions['wxPython-tuple'] < (2,5,3):
149                alpha_data = None
150    
151            if format == 'RAW':
152                image = wxEmptyImage(width, height)
153                image.SetData(image_data)
154                if mask_data is not None:
155                    mask = wxBitmapFromBits(mask_data, width, height, 1)
156                    mask = wxMask(mask)
157                elif alpha_data is not None:
158                    # alpha_data is already in the right format
159                    alpha = alpha_data
160    
         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  
161          else:          else:
162              if data is not None:              stream = cStringIO.StringIO(image_data)
163                  stream = cStringIO.StringIO(data)              image = wxImageFromStream(stream, raster_format_map[format])
164                  image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)              if mask_data is not None:
165                  bitmap = wxBitmapFromImage(image)                  stream = cStringIO.StringIO(mask_data)
166                  self.dc.BeginDrawing()                  mask = wxImageFromStream(stream, raster_format_map[format])
167                  self.dc.DrawBitmap(bitmap, 0, 0)                  mask = wxMask(wxBitmapFromImage(mask, 1))
168                  self.dc.EndDrawing()              elif alpha_data is not None:
169                    stream = cStringIO.StringIO(alpha_data)
170      def layer_ids(self, layer):                  alpha = wxImageFromStream(stream, raster_format_map[format])
171          """Return the shape ids of the given layer that have to be drawn.                  alpha = alpha.GetData()[:] # XXX: do we need to copy this?
   
         The default implementation simply returns all ids in the layer.  
         Override in derived classes to be more precise.  
         """  
         return range(layer.NumShapes())  
   
     def polygon_render_param(self, layer):  
         """Return the low-lever render parameter for the layer"""  
         offx, offy = self.offset  
         return draw_polygon_init(layer.ShapeStore().Shapefile(), self.dc,  
                                  self.map.projection,  
                                  layer.projection,  
                                  self.scale, -self.scale,  
                                  offx, offy)  
172    
173      def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):          #
174          draw_polygon_shape(draw_polygon_info, index, pen, brush)          # if we are using the alpha_data then scale down the alpha values
175            # by the layer's opacity using a string translation table
176      def projected_points(self, layer, index):          #
177          proj = self.map.GetProjection()          if alpha is not None:
178          if proj is not None:              lo = layer.Opacity()
179              forward = proj.Forward              if lo == 0:
180          else:                  return
181              forward = None              elif lo == 1:
182          proj = layer.GetProjection()                  a = alpha
183          if proj is not None:              else:
184              inverse = proj.Inverse                  tr = [int(i*lo) for i in range(256)]
185          else:                  table = array.array('B', tr).tostring()
186              inverse = None                  a = alpha.translate(table)
         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)  
187    
188      def draw_label_layer(self, layer):              image.SetAlphaData(a)
         scale = self.scale  
         offx, offy = self.offset  
189    
190          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)          bitmap = wxBitmapFromImage(image)
         self.dc.SetFont(font)  
191    
192          map_proj = self.map.projection          if mask is not None:
193          if map_proj is not None:              bitmap.SetMask(mask)
             forward = map_proj.Forward  
         else:  
             forward = None  
194    
195          for label in layer.Labels():          self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
             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)  
196    
197    
198  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
199    
200      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
201      honor_visibility = 1      honor_visibility = 1
202        
203      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, selected_layer, selected_shapes):
204          """Render the map.          """Render the map.
205    
206          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
# Line 334  class ScreenRenderer(MapRenderer): Line 208  class ScreenRenderer(MapRenderer):
208          shapes given by the ids in selected_shapes in the          shapes given by the ids in selected_shapes in the
209          selected_layer.          selected_layer.
210          """          """
         self.update_region = region  
211          self.selected_layer = selected_layer          self.selected_layer = selected_layer
212          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
213          self.render_map(map)          self.render_map()
214    
215      def draw_shape_layer(self, layer):      def RenderMapIncrementally(self):
216          MapRenderer.draw_shape_layer(self, layer)          """Render the map.
217          if layer is self.selected_layer and self.selected_shapes:  
218              pen = wxPen(wxBLACK, 3, wxSOLID)          Only the given region (a tuple in window coordinates as returned
219              brush = wxBrush(wxBLACK, wxCROSS_HATCH)          by a wxrect's asTuple method) needs to be redrawn. Highlight the
220            shapes given by the ids in selected_shapes in the
221              shapetype = layer.ShapeType()          selected_layer.
222              if shapetype == SHAPETYPE_POLYGON:          """
223                  offx, offy = self.offset          return self.render_map_incrementally()
                 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)  
224    
225              for index in self.selected_shapes:      def draw_selection_incrementally(self, layer, selected_shapes):
226                  func(renderparam, index, *args)          """Draw the selected shapes in a emphasized way (i.e.
227            with a special pen and brush.
228            The drawing is performed incrementally, that means every
229            n shapes, the user can have interactions with the map.
230            n is currently fixed to 500.
231    
232            layer -- the layer where the shapes belong to.
233            selected_shapes -- a list of the shape-ids representing the
234                               selected shapes for the given layer.
235            """
236            pen = wxPen(wxBLACK, 3, wxSOLID)
237            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
238    
239            shapetype = layer.ShapeType()
240            useraw, func, param = self.low_level_renderer(layer)
241            args = (pen, brush)
242    
243            # for point shapes we need to find out the properties
244            # to determine the size. Based on table and field,
245            # we can find out the properties for object - see below.
246            if shapetype == SHAPETYPE_POINT:
247                lc = layer.GetClassification()
248                field = layer.GetClassificationColumn()
249                table = layer.ShapeStore().Table()
250    
251            count = 0
252            for index in selected_shapes:
253                count += 1
254                shape = layer.Shape(index)
255    
256                # Get the size of the specific property for this
257                # point
258                if shapetype == SHAPETYPE_POINT and field is not None:
259                    value = table.ReadValue(shape.ShapeID(), field)
260                    group = lc.FindGroup(value)
261                    size = group.GetProperties().GetSize()
262                    args = (pen, brush, size)
263    
264                if useraw:
265                    data = shape.RawData()
266                else:
267                    data = shape.Points()
268                func(param, data, *args)
269                if count % 500 == 0:
270                    yield True
271    
272      def layer_ids(self, layer):      def layer_shapes(self, layer):
273          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
274    
275          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 389  class ScreenRenderer(MapRenderer): Line 290  class ScreenRenderer(MapRenderer):
290          offx, offy = self.offset          offx, offy = self.offset
291          xs = []          xs = []
292          ys = []          ys = []
293          x, y, width, height = self.update_region          x, y, width, height = self.region
294          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
295                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
296              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 409  class ScreenRenderer(MapRenderer): Line 310  class ScreenRenderer(MapRenderer):
310  class ExportRenderer(ScreenRenderer):  class ExportRenderer(ScreenRenderer):
311    
312      honor_visibility = 1      honor_visibility = 1
313        
314      def RenderMap(self, map, region, mapregion,      def __init__(self, *args, **kw):
315                    selected_layer, selected_shapes ):          """Initialize the ExportRenderer.
316    
317            In addition to all parameters of the the ScreenRender
318            constructor, this class requires and additional keyword argument
319            destination_region with a tuple (minx, miny, maxx, maxy) giving
320            the region in dc coordinates which is to contain the map.
321            """
322            self.destination_region = kw["destination_region"]
323            del kw["destination_region"]
324            ScreenRenderer.__init__(self, *args, **kw)
325    
326        def RenderMap(self, selected_layer, selected_shapes):
327          """Render the map.          """Render the map.
328    
329          The rendering device has been specified during initialisation.          The rendering device has been specified during initialisation.
330          The device border distance was set in Thuban.UI.view.OutputTranform().          The device border distance was set in
331                    Thuban.UI.viewport.output_transform().
332    
333          RenderMap renders a frame set (one page frame, one around          RenderMap renders a frame set (one page frame, one around
334          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
335          scalebar on the given DC. The map is rendered with the region displayed          the scalebar on the given DC. The map is rendered with the
336          in the canvas view, centered on the area available for map display.          region displayed in the canvas view, centered on the area
337            available for map display.
338          """          """
339            
         self.update_region = region  
340          self.selected_layer = selected_layer          self.selected_layer = selected_layer
341          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
342    
343          # Get some dimensions          # Get some dimensions
344          llx, lly, urx, ury = region          llx, lly, urx, ury = self.region
345          self.mapregion = mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
         mminx, mminy, mmaxx, mmaxy = self.mapregion  
346    
347          # Manipulate the offset to position the map          # Manipulate the offset to position the map
348          offx, offy = self.offset          offx, offy = self.offset
349          # 1. Shift to corner of map drawing area          # 1. Shift to corner of map drawing area
350          offx = offx + mminx          offx = offx + mminx
351          offy = offy + mminy          offy = offy + mminy
352    
353          # 2. Center the map on the map drawing area:          # 2. Center the map on the map drawing area:
354          # region identifies the region on the canvas view:          # region identifies the region on the canvas view:
355          # center of map drawing area - half the size of region: rendering origin          # center of map drawing area - half the size of region: rendering origin
356          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
357          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
358    
359          self.offset = (offx+self.shiftx, offy+self.shifty)          self.offset = (offx+self.shiftx, offy+self.shifty)
360            self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)
361    
362          # Draw the map          # Draw the map
363          self.dc.BeginDrawing()          self.dc.BeginDrawing()
364          self.dc.DestroyClippingRegion()          self.dc.DestroyClippingRegion()
365          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
366                                    urx, ury)                                    urx, ury)
367          self.render_map(map)          self.render_map()
368          self.dc.EndDrawing()          self.dc.EndDrawing()
369    
370          # Draw the rest (frames, legend, scalebar)          # Draw the rest (frames, legend, scalebar)
# Line 462  class ExportRenderer(ScreenRenderer): Line 375  class ExportRenderer(ScreenRenderer):
375          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
376          self.dc.SetFont(font)          self.dc.SetFont(font)
377    
378          self.render_frame(region)          self.render_frame()
379          self.render_legend(map)          self.render_legend()
380          self.render_scalebar(map)          self.render_scalebar()
381          self.dc.EndDrawing()          self.dc.EndDrawing()
382    
383      def render_frame(self, region):      def render_frame(self):
384          """Render the frames for map and legend/scalebar."""          """Render the frames for map and legend/scalebar."""
385    
386          dc = self.dc          dc = self.dc
# Line 476  class ExportRenderer(ScreenRenderer): Line 389  class ExportRenderer(ScreenRenderer):
389    
390          # Dimension stuff          # Dimension stuff
391          width, height = dc.GetSizeTuple()          width, height = dc.GetSizeTuple()
392          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
393    
394          # Page Frame          # Page Frame
395          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
396            
397          # Map Frame          # Map Frame
398          llx, lly, urx, ury = region          llx, lly, urx, ury = self.region
399          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
400            
401          # Legend Frame          # Legend Frame
402          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
403    
# Line 492  class ExportRenderer(ScreenRenderer): Line 405  class ExportRenderer(ScreenRenderer):
405          dc.SetClippingRegion(mmaxx+10,mminy,          dc.SetClippingRegion(mmaxx+10,mminy,
406                               (width-20) - (mmaxx+10), mmaxy-mminy)                               (width-20) - (mmaxx+10), mmaxy-mminy)
407    
408      def render_legend(self, map):      def render_legend(self):
409          """Render the legend on the Map."""          """Render the legend on the Map."""
410    
411          previewer = ClassDataPreviewer()          previewer = ClassDataPreviewer()
# Line 502  class ExportRenderer(ScreenRenderer): Line 415  class ExportRenderer(ScreenRenderer):
415    
416          # Dimension stuff          # Dimension stuff
417          width, height = dc.GetSizeTuple()          width, height = dc.GetSizeTuple()
418          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
419          textwidth, textheight = dc.GetTextExtent("0")          textwidth, textheight = dc.GetTextExtent("0")
420          iconwidth  = textheight          iconwidth  = textheight
421          iconheight = textheight          iconheight = textheight
422          stepy = textheight+3          stepy = textheight+3
423          dx = 10          dx = 10
424          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
425                                  # 5 pix inside legend frame                                  # 5 pix inside legend frame
426          posy = mminy + 5        # 5 pix inside legend frame          posy = mminy + 5        # 5 pix inside legend frame
427            
428          # Render the legend          # Render the legend
429          dc.SetTextForeground(wxBLACK)          dc.SetTextForeground(wxBLACK)
430          if map.HasLayers():          if self.map.HasLayers():
431              for l in map.Layers():              layers = self.map.Layers()[:]
432                layers.reverse()
433                for l in layers:
434                  if l.Visible():                  if l.Visible():
435                      # Render title                      # Render title
436                      dc.DrawText(l.Title(), posx, posy)                      dc.DrawText(l.Title(), posx, posy)
# Line 526  class ExportRenderer(ScreenRenderer): Line 441  class ExportRenderer(ScreenRenderer):
441                          shapeType = l.ShapeType()                          shapeType = l.ShapeType()
442                          for g in clazz:                          for g in clazz:
443                              if g.IsVisible():                              if g.IsVisible():
444                                  previewer.Draw(dc,                                  previewer.Draw(dc,
445                                      wxRect(posx+dx, posy,                                      wxRect(posx+dx, posy,
446                                             iconwidth, iconheight),                                             iconwidth, iconheight),
447                                      g.GetProperties(), shapeType)                                      g.GetProperties(), shapeType)
448                                  dc.DrawText(g.GetDisplayText(),                                  dc.DrawText(g.GetDisplayText(),
449                                              posx+2*dx+iconwidth, posy)                                              posx+2*dx+iconwidth, posy)
450                                  posy+=stepy                                  posy+=stepy
451            
452      def render_scalebar(self, map):      def render_scalebar(self):
453          """Render the scalebar."""          """Render the scalebar."""
454    
455          scalebar = ScaleBar(map)          scalebar = ScaleBar(self.map)
456    
457          # Dimension stuff          # Dimension stuff
458          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
459          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
460          
461          # Render the scalebar          # Render the scalebar
462          scalebar.DrawScaleBar(self.scale, self.dc,          scalebar.DrawScaleBar(self.scale, self.dc,
463                               (mmaxx+10+5, mmaxy-25),                               (mmaxx+10+5, mmaxy-25),
464                               ((width-15-5) - (mmaxx+10+5),20)                               ((width-15-5) - (mmaxx+10+5),20)
465                              )                              )
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