/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 1234 by jonathan, Wed Jun 18 14:47:38 2003 UTC revision 2602 by joey, Mon Apr 25 15:01:48 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    import traceback
22    
23  from Thuban import _  from Thuban import _
24    
25  from wxPython.wx import wxMemoryDC, wxEmptyBitmap, \  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
     wxPoint, wxRect, wxPen, wxBrush, wxFont, \  
26      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
27      wxBLACK_PEN, wxRED_PEN, wxBLACK, \      wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
28      wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \      wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, \
29      wxBitmap, wxImageFromBitmap, wxBitmapFromImage, \      wxBITMAP_TYPE_JPEG, wxBITMAP_TYPE_PNG, wxBITMAP_TYPE_TIF, \
30      wxImageFromStream, wxBITMAP_TYPE_BMP      wxBITMAP_TYPE_GIF, wxEmptyImage, wxMask, wxBitmapFromBits
31    
32  from wxproj import draw_polygon_shape, draw_polygon_init  from wxproj import draw_polygon_shape, draw_polygon_init
33    
# Line 27  from Thuban.UI.common import Color2wxCol Line 35  from Thuban.UI.common import Color2wxCol
35  from Thuban.UI.classifier import ClassDataPreviewer  from Thuban.UI.classifier import ClassDataPreviewer
36  from Thuban.UI.scalebar import ScaleBar  from Thuban.UI.scalebar import ScaleBar
37    
38  from Thuban.Model.layer import Layer, RasterLayer, \  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
39       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  
40    
41  from Thuban.Model.classification import Classification  from Thuban.Model.color import Transparent
 from Thuban.Model.color import Color  
42  import Thuban.Model.resource  import Thuban.Model.resource
43    
44  if Thuban.Model.resource.has_gdal_support():  from baserenderer import BaseRenderer
     from gdalwarp import ProjectRasterFile  
   
 class MapRenderer:  
45    
46      """Class to render a map onto a wxDC"""  from math import floor
   
     honor_visibility = 1  
47    
48      def __init__(self, dc, scale, offset, resolution = 72.0,  from types import StringType
                  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  
49    
50          if self.scale == 0:  from Thuban.version import versions
             return  
51    
52          #  if Thuban.Model.resource.has_gdal_support():
53          # 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  
54    
         map_proj = self.map.projection  
         layer_proj = layer.projection  
55    
56          shapetype = layer.ShapeType()  # Map the strings used for the format parameter of the draw_raster_data
57    # method to the appropriate wxWindows constants
58    raster_format_map = {
59        "BMP": wxBITMAP_TYPE_BMP,
60        "JPEG": wxBITMAP_TYPE_JPEG,
61        "PNG": wxBITMAP_TYPE_PNG,
62        "TIFF": wxBITMAP_TYPE_TIF,
63        "GIF": wxBITMAP_TYPE_GIF,
64        }
65    
66          brush = wxTRANSPARENT_BRUSH  class MapRenderer(BaseRenderer):
         pen   = wxTRANSPARENT_PEN  
67    
68          old_prop = None      """Class to render a map onto a wxDC"""
         old_group = None  
         lc = layer.GetClassification()  
         field = lc.GetField()  
         defaultGroup = lc.GetDefaultGroup()  
69    
70        TRANSPARENT_PEN = wxTRANSPARENT_PEN
71        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
72    
73          if shapetype != SHAPETYPE_POINT:      def make_point(self, x, y):
74              polygon_render_param = self.polygon_render_param(layer)          return wxPoint(int(round(x)), int(round(y)))
75    
76          if shapetype == SHAPETYPE_POINT:      def tools_for_property(self, prop):
77              draw_func = lambda i: \          fill = prop.GetFill()
78                     self.draw_point_shape(layer, i)          if fill is Transparent:
79                brush = self.TRANSPARENT_BRUSH
80          else:          else:
81              draw_func = lambda i: \              brush = wxBrush(Color2wxColour(fill), wxSOLID)
                    self.draw_polygon_shape(polygon_render_param, i, pen, brush)  
82    
83          table = layer.ShapeStore().Table()          stroke = prop.GetLineColor()
84          for i in self.layer_ids(layer):          if stroke is Transparent:
85                pen = self.TRANSPARENT_PEN
86              if field is None:          else:
87                  group = defaultGroup              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
88              else:          return pen, brush
                 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()  
   
   
                     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 + " "  
89    
90          outProj = ""      def low_level_renderer(self, layer):
91          proj = self.map.GetProjection()          """Override inherited method to provide more efficient renderers
         if proj is not None:  
             for p in proj.GetAllParameters():  
                 outProj += "+" + p + " "  
92    
93          xmin = (0 - offx) / self.scale          If the underlying data format is not a shapefile or the layer
94          ymin = (offy - height) / self.scale          contains points shapes, simply use what the inherited method
95          xmax = (width - offx) / self.scale          returns.
96          ymax = (offy - 0) / self.scale  
97            Otherwise, i.e. for arc and polygon use the more efficient
98          try:          wxproj.draw_polygon_shape and its corresponding parameter
99              data = ProjectRasterFile(          created with wxproj.draw_polygon_init.
100                  layer.GetImageFilename(),          """
101                  inProj,          if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
102                  outProj,              and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
103                  (xmin, ymin, xmax, ymax),              offx, offy = self.offset
104                  "", (width, height))              x = lambda a, b, c, d: None
105          except IOError, (strerr):              #return (True, x, None)
106              print strerr              return (True, draw_polygon_shape,
107          except (AttributeError, ValueError):                      draw_polygon_init(layer.ShapeStore().Shapefile(),
108              pass                                        self.dc, self.map.projection,
109                                          layer.projection,
110                                          self.scale, -self.scale, offx, offy))
111          else:          else:
112              if data is not None:              return BaseRenderer.low_level_renderer(self, layer)
                 stream = cStringIO.StringIO(data)  
                 image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)  
                 bitmap = wxBitmapFromImage(image)  
                 self.dc.BeginDrawing()  
                 self.dc.DrawBitmap(bitmap, 0, 0)  
                 self.dc.EndDrawing()  
113    
114      def layer_ids(self, layer):      def label_font(self):
115          """Return the shape ids of the given layer that have to be drawn.          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
116                          wxNORMAL)
117    
118        def projected_raster_layer(self, layer, srcProj, dstProj, extents,
119                                   resolution, dimensions, options):
120            """Returns a raster layer image in projected space
121    
122          The default implementation simply returns all ids in the layer.          Based on a given filename.  This method must be implemented in
123          Override in derived classes to be more precise.          classes derived from BaseRenderer.
124          """          """
         return range(layer.NumShapes())  
125    
126      def polygon_render_param(self, layer):          ret = None
         """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)  
127    
128      def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):          if Thuban.Model.resource.has_gdal_support():
129          draw_polygon_shape(draw_polygon_info, index, pen, brush)  
130                if versions['wxPython-tuple'] < (2,5,3):
131                    options = options | 4  # INVERT_MASK_BITS
132                    options = options & ~2 # ALPHA_MASK not supported
133    
134                try:
135                    ret = ProjectRasterFile(layer.GetImageFilename(),
136                                            srcProj, dstProj,
137                                            extents, resolution, dimensions,
138                                            options)
139                except (MemoryError, IOError, AttributeError, ValueError):
140                    # Why does this catch AttributeError and ValueError?
141                    # FIXME: The exception should be communicated to the user
142                    # better.
143                    traceback.print_exc()
144    
145            return ret
146    
147        def draw_raster_data(self, layer, x,y, data, format = 'BMP'):
148    
149            mask = None
150            alpha = None
151            width = data[0]
152            height = data[1]
153            image_data, mask_data, alpha_data = data[2]
154    
155            if versions['wxPython-tuple'] < (2,5,3):
156                alpha_data = None
157    
158            if format == 'RAW':
159                image = wxEmptyImage(width, height)
160                image.SetData(image_data)
161                if mask_data is not None:
162                    mask = wxBitmapFromBits(mask_data, width, height, 1)
163                    mask = wxMask(mask)
164                elif alpha_data is not None:
165                    # alpha_data is already in the right format
166                    alpha = alpha_data
167    
     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  
168          else:          else:
169              inverse = None              stream = cStringIO.StringIO(image_data)
170          shape = layer.Shape(index)              image = wxImageFromStream(stream, raster_format_map[format])
171          points = []              if mask_data is not None:
172          scale = self.scale                  stream = cStringIO.StringIO(mask_data)
173          offx, offy = self.offset                  mask = wxImageFromStream(stream, raster_format_map[format])
174          for x, y in shape.Points():                  mask = wxMask(wxBitmapFromImage(mask, 1))
175              if inverse:              elif alpha_data is not None:
176                  x, y = inverse(x, y)                  stream = cStringIO.StringIO(alpha_data)
177              if forward:                  alpha = wxImageFromStream(stream, raster_format_map[format])
178                  x, y = forward(x, y)                  alpha = alpha.GetData()[:] # XXX: do we need to copy this?
             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)  
179    
180      def draw_label_layer(self, layer):          #
181          scale = self.scale          # if we are using the alpha_data then scale down the alpha values
182          offx, offy = self.offset          # by the layer's opacity using a string translation table
183            #
184            if alpha is not None:
185                lo = layer.Opacity()
186                if lo == 0:
187                    return
188                elif lo == 1:
189                    a = alpha
190                else:
191                    tr = [int(i*lo) for i in range(256)]
192                    table = array.array('B', tr).tostring()
193                    a = alpha.translate(table)
194    
195          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)              image.SetAlphaData(a)
         self.dc.SetFont(font)  
196    
197          map_proj = self.map.projection          bitmap = wxBitmapFromImage(image)
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
198    
199          for label in layer.Labels():          if mask is not None:
200              x = label.x              bitmap.SetMask(mask)
201              y = label.y  
202              text = label.text          self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
             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)  
203    
204    
205  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
206    
207      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
208      honor_visibility = 1      honor_visibility = 1
209        
210      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, selected_layer, selected_shapes):
211          """Render the map.          """Render the map.
212    
213          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 215  class ScreenRenderer(MapRenderer):
215          shapes given by the ids in selected_shapes in the          shapes given by the ids in selected_shapes in the
216          selected_layer.          selected_layer.
217          """          """
         self.update_region = region  
218          self.selected_layer = selected_layer          self.selected_layer = selected_layer
219          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
220          self.render_map(map)          self.render_map()
221    
222      def draw_shape_layer(self, layer):      def RenderMapIncrementally(self):
223          MapRenderer.draw_shape_layer(self, layer)          """Render the map.
         if layer is self.selected_layer and self.selected_shapes:  
             pen = wxPen(wxBLACK, 3, wxSOLID)  
             brush = wxBrush(wxBLACK, wxCROSS_HATCH)  
   
             shapetype = layer.ShapeType()  
             if shapetype == SHAPETYPE_POLYGON:  
                 offx, offy = self.offset  
                 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:          Only the given region (a tuple in window coordinates as returned
226                  func(renderparam, index, *args)          by a wxrect's asTuple method) needs to be redrawn. Highlight the
227            shapes given by the ids in selected_shapes in the
228            selected_layer.
229            """
230            return self.render_map_incrementally()
231    
232        def draw_selection_incrementally(self, layer, selected_shapes):
233            """Draw the selected shapes in a emphasized way (i.e.
234            with a special pen and brush.
235            The drawing is performed incrementally, that means every
236            n shapes, the user can have interactions with the map.
237            n is currently fixed to 500.
238    
239            layer -- the layer where the shapes belong to.
240            selected_shapes -- a list of the shape-ids representing the
241                               selected shapes for the given layer.
242            """
243            pen = wxPen(wxBLACK, 3, wxSOLID)
244            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
245    
246            shapetype = layer.ShapeType()
247            useraw, func, param = self.low_level_renderer(layer)
248            args = (pen, brush)
249    
250            # for point shapes we need to find out the properties
251            # to determine the size. Based on table and field,
252            # we can find out the properties for object - see below.
253            if shapetype == SHAPETYPE_POINT:
254                lc = layer.GetClassification()
255                field = layer.GetClassificationColumn()
256                table = layer.ShapeStore().Table()
257    
258            count = 0
259            for index in selected_shapes:
260                count += 1
261                shape = layer.Shape(index)
262    
263                # Get the size of the specific property for this
264                # point
265                if shapetype == SHAPETYPE_POINT and field is not None:
266                    value = table.ReadValue(shape.ShapeID(), field)
267                    group = lc.FindGroup(value)
268                    size = group.GetProperties().GetSize()
269                    args = (pen, brush, size)
270    
271                if useraw:
272                    data = shape.RawData()
273                else:
274                    data = shape.Points()
275                func(param, data, *args)
276                if count % 500 == 0:
277                    yield True
278    
279      def layer_ids(self, layer):      def layer_shapes(self, layer):
280          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
281    
282          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 297  class ScreenRenderer(MapRenderer):
297          offx, offy = self.offset          offx, offy = self.offset
298          xs = []          xs = []
299          ys = []          ys = []
300          x, y, width, height = self.update_region          x, y, width, height = self.region
301          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
302                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
303              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 409  class ScreenRenderer(MapRenderer): Line 317  class ScreenRenderer(MapRenderer):
317  class ExportRenderer(ScreenRenderer):  class ExportRenderer(ScreenRenderer):
318    
319      honor_visibility = 1      honor_visibility = 1
320        
321      def RenderMap(self, map, region, mapregion,      def __init__(self, *args, **kw):
322                    selected_layer, selected_shapes ):          """Initialize the ExportRenderer.
323    
324            In addition to all parameters of the the ScreenRender
325            constructor, this class requires and additional keyword argument
326            destination_region with a tuple (minx, miny, maxx, maxy) giving
327            the region in dc coordinates which is to contain the map.
328            """
329            self.destination_region = kw["destination_region"]
330            del kw["destination_region"]
331            ScreenRenderer.__init__(self, *args, **kw)
332    
333        def RenderMap(self, selected_layer, selected_shapes):
334          """Render the map.          """Render the map.
335    
336          The rendering device has been specified during initialisation.          The rendering device has been specified during initialisation.
337          The device border distance was set in Thuban.UI.view.OutputTranform().          The device border distance was set in
338                    Thuban.UI.viewport.output_transform().
339    
340          RenderMap renders a frame set (one page frame, one around          RenderMap renders a frame set (one page frame, one around
341          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
342          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
343          in the canvas view, centered on the area available for map display.          region displayed in the canvas view, centered on the area
344            available for map display.
345          """          """
346            
         self.update_region = region  
347          self.selected_layer = selected_layer          self.selected_layer = selected_layer
348          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
349    
350          # Get some dimensions          # Get some dimensions
351          llx, lly, urx, ury = region          llx, lly, urx, ury = self.region
352          self.mapregion = mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
         mminx, mminy, mmaxx, mmaxy = self.mapregion  
353    
354          # Manipulate the offset to position the map          # Manipulate the offset to position the map
355          offx, offy = self.offset          offx, offy = self.offset
356          # 1. Shift to corner of map drawing area          # 1. Shift to corner of map drawing area
357          offx = offx + mminx          offx = offx + mminx
358          offy = offy + mminy          offy = offy + mminy
359    
360          # 2. Center the map on the map drawing area:          # 2. Center the map on the map drawing area:
361          # region identifies the region on the canvas view:          # region identifies the region on the canvas view:
362          # center of map drawing area - half the size of region: rendering origin          # center of map drawing area - half the size of region: rendering origin
363          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
364          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
365    
366          self.offset = (offx+self.shiftx, offy+self.shifty)          self.offset = (offx+self.shiftx, offy+self.shifty)
367            self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)
368    
369          # Draw the map          # Draw the map
370          self.dc.BeginDrawing()          self.dc.BeginDrawing()
371          self.dc.DestroyClippingRegion()          self.dc.DestroyClippingRegion()
372          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
373                                    urx, ury)                                    urx, ury)
374          self.render_map(map)          self.render_map()
375          self.dc.EndDrawing()          self.dc.EndDrawing()
376    
377          # Draw the rest (frames, legend, scalebar)          # Draw the rest (frames, legend, scalebar)
# Line 462  class ExportRenderer(ScreenRenderer): Line 382  class ExportRenderer(ScreenRenderer):
382          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
383          self.dc.SetFont(font)          self.dc.SetFont(font)
384    
385          self.render_frame(region)          self.render_frame()
386          self.render_legend(map)          self.render_legend()
387          self.render_scalebar(map)          self.render_scalebar()
388          self.dc.EndDrawing()          self.dc.EndDrawing()
389    
390      def render_frame(self, region):      def render_frame(self):
391          """Render the frames for map and legend/scalebar."""          """Render the frames for map and legend/scalebar."""
392    
393          dc = self.dc          dc = self.dc
# Line 476  class ExportRenderer(ScreenRenderer): Line 396  class ExportRenderer(ScreenRenderer):
396    
397          # Dimension stuff          # Dimension stuff
398          width, height = dc.GetSizeTuple()          width, height = dc.GetSizeTuple()
399          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
400    
401          # Page Frame          # Page Frame
402          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
403            
404          # Map Frame          # Map Frame
405          llx, lly, urx, ury = region          llx, lly, urx, ury = self.region
406          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
407            
408          # Legend Frame          # Legend Frame
409          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
410    
# Line 492  class ExportRenderer(ScreenRenderer): Line 412  class ExportRenderer(ScreenRenderer):
412          dc.SetClippingRegion(mmaxx+10,mminy,          dc.SetClippingRegion(mmaxx+10,mminy,
413                               (width-20) - (mmaxx+10), mmaxy-mminy)                               (width-20) - (mmaxx+10), mmaxy-mminy)
414    
415      def render_legend(self, map):      def render_legend(self):
416          """Render the legend on the Map."""          """Render the legend on the Map."""
417    
418          previewer = ClassDataPreviewer()          previewer = ClassDataPreviewer()
# Line 502  class ExportRenderer(ScreenRenderer): Line 422  class ExportRenderer(ScreenRenderer):
422    
423          # Dimension stuff          # Dimension stuff
424          width, height = dc.GetSizeTuple()          width, height = dc.GetSizeTuple()
425          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
426          textwidth, textheight = dc.GetTextExtent("0")          textwidth, textheight = dc.GetTextExtent("0")
427          iconwidth  = textheight          iconwidth  = textheight
428          iconheight = textheight          iconheight = textheight
429          stepy = textheight+3          stepy = textheight+3
430          dx = 10          dx = 10
431          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
432                                  # 5 pix inside legend frame                                  # 5 pix inside legend frame
433          posy = mminy + 5        # 5 pix inside legend frame          posy = mminy + 5        # 5 pix inside legend frame
434            
435          # Render the legend          # Render the legend
436          dc.SetTextForeground(wxBLACK)          dc.SetTextForeground(wxBLACK)
437          if map.HasLayers():          if self.map.HasLayers():
438              for l in map.Layers():              layers = self.map.Layers()[:]
439                layers.reverse()
440                for l in layers:
441                  if l.Visible():                  if l.Visible():
442                      # Render title                      # Render title
443                      dc.DrawText(l.Title(), posx, posy)                      dc.DrawText(l.Title(), posx, posy)
444                      posy+=stepy                      posy+=stepy
445                      # Render classification                      if l.HasClassification():
446                      clazz = l.GetClassification()                          # Render classification
447                      shapeType = l.ShapeType()                          clazz = l.GetClassification()
448                      for g in clazz:                          shapeType = l.ShapeType()
449                          if g.IsVisible():                          for g in clazz:
450                              previewer.Draw(dc,                              if g.IsVisible():
451                                  wxRect(posx+dx, posy, iconwidth, iconheight),                                  previewer.Draw(dc,
452                                  g.GetProperties(), shapeType)                                      wxRect(posx+dx, posy,
453                              dc.DrawText(g.GetDisplayText(),                                             iconwidth, iconheight),
454                                          posx+2*dx+iconwidth, posy)                                      g.GetProperties(), shapeType)
455                              posy+=stepy                                  dc.DrawText(g.GetDisplayText(),
456                                                        posx+2*dx+iconwidth, posy)
457      def render_scalebar(self, map):                                  posy+=stepy
458    
459        def render_scalebar(self):
460          """Render the scalebar."""          """Render the scalebar."""
461    
462          scalebar = ScaleBar(map)          scalebar = ScaleBar(self.map)
463    
464          # Dimension stuff          # Dimension stuff
465          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
466          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
467          
468          # Render the scalebar          # Render the scalebar
469          scalebar.DrawScaleBar(self.scale, self.dc,          scalebar.DrawScaleBar(self.scale, self.dc,
470                               (mmaxx+10+5, mmaxy-25),                               (mmaxx+10+5, mmaxy-25),
471                               ((width-15-5) - (mmaxx+10+5),20)                               ((width-15-5) - (mmaxx+10+5),20)
472                              )                              )
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