/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 642 by jonathan, Thu Apr 10 14:41:50 2003 UTC revision 1927 by bh, Mon Nov 10 16:57:35 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 *  
19    
20  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
21       SHAPETYPE_POINT      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
22  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \      wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
23       ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE      wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, wxBITMAP_TYPE_JPEG
24    
25  from Thuban.Model.classification import Classification  from wxproj import draw_polygon_shape, draw_polygon_init
 from Thuban.Model.color import Color  
26    
27    from Thuban.UI.common import Color2wxColour
28    from Thuban.UI.classifier import ClassDataPreviewer
29    from Thuban.UI.scalebar import ScaleBar
30    
31  class MapRenderer:  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
32         SHAPETYPE_POINT, RAW_SHAPEFILE
33    
34      """Class to render a map onto a wxDC"""  from Thuban.Model.color import Transparent
35    import Thuban.Model.resource
36    
37      honor_visibility = 1  from baserenderer import BaseRenderer
38    
     def __init__(self, dc, scale, offset, resolution = 72.0,  
                  honor_visibility = None):  
         """Inititalize the renderer.  
   
         dc -- the wxPython DC to render on  
         scale, offset -- the scale factor and translation to convert  
                 between projected coordinates and the DC coordinates  
   
         resolution -- the assumed resolution of the DC. Used to convert  
                 absolute lengths like font sizes to DC coordinates  
   
         honor_visibility -- boolean. If true, honor the visibility flag  
                 of the layers, otherwise draw all layers. If None, use  
                 the renderer's default.  
         """  
         # resolution in pixel/inch  
39    
40          assert scale > 0  # Map the strings used for the format parameter of the draw_raster_data
41    # method to the appropriate wxWindows constants
42          self.dc = dc  raster_format_map = {
43          self.scale = scale      "BMP": wxBITMAP_TYPE_BMP,
44          self.offset = offset      "JPEG": wxBITMAP_TYPE_JPEG,
45          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())  
   
     def draw_shape_layer(self, layer):  
         scale = self.scale  
         offx, offy = self.offset  
46    
47          map_proj = self.map.projection  class MapRenderer(BaseRenderer):
         layer_proj = layer.projection  
48    
49          shapetype = layer.ShapeType()      """Class to render a map onto a wxDC"""
   
         brush = wxTRANSPARENT_BRUSH  
         pen   = wxTRANSPARENT_PEN  
   
         old_prop = None  
         lc = layer.GetClassification()  
         field = lc.GetField()  
   
         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  
                 #  
50    
51                  group = lc.FindGroup(value)      TRANSPARENT_PEN = wxTRANSPARENT_PEN
52        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
53    
54                  #prop = lc.GetProperties(value)      make_point = wxPoint
             else:  
                 group = lc.GetDefaultGroup()  
55    
56              prop = group.GetProperties()      def tools_for_property(self, prop):
57            fill = prop.GetFill()
58            if fill is Transparent:
59                brush = self.TRANSPARENT_BRUSH
60            else:
61                brush = wxBrush(Color2wxColour(fill), wxSOLID)
62    
63              if not group.IsVisible():          stroke = prop.GetLineColor()
64                  continue          if stroke is Transparent:
65                pen = self.TRANSPARENT_PEN
66            else:
67                pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
68            return pen, brush
69    
70              # don't recreate new objects if they are the same as before      def low_level_renderer(self, layer):
71              if prop != old_prop:          """Override inherited method to provide more efficient renderers
                 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)  
                 self.draw_point_shape(layer, i)  
             else:  
                 self.draw_polygon_shape(layer, i, pen, brush)  
72    
73      def layer_ids(self, layer):          If the underlying data format is not a shapefile or the layer
74          """Return the shape ids of the given layer that have to be drawn.          contains points shapes, simply use what the inherited method
75                    returns.
76          The default implementation simply returns all ids in the layer.  
77          Override in derived classes to be more precise.          Otherwise, i.e. for arc and polygon use the more efficient
78            wxproj.draw_polygon_shape and its corresponding parameter
79            created with wxproj.draw_polygon_init.
80          """          """
81          return range(layer.NumShapes())          if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
82                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
83      def draw_polygon_shape(self, layer, index, pen, brush):              offx, offy = self.offset
84          offx, offy = self.offset                      return (True, draw_polygon_shape,
85          draw_polygon_shape(layer.shapefile.cobject(), index,                      draw_polygon_init(layer.ShapeStore().Shapefile(),
86                             self.dc, pen, brush,                                        self.dc, self.map.projection,
87                             self.map.projection, layer.projection,                                        layer.projection,
88                             self.scale, -self.scale, offx, offy)                                        self.scale, -self.scale, offx, offy))
   
     def projected_points(self, layer, index):  
         proj = self.map.projection  
         if proj is not None:  
             forward = proj.Forward  
89          else:          else:
90              forward = None              return BaseRenderer.low_level_renderer(self, layer)
         proj = layer.projection  
         if proj is not None:  
             inverse = proj.Inverse  
         else:  
             inverse = None  
         shape = layer.Shape(index)  
         points = []  
         scale = self.scale  
         offx, offy = self.offset  
         for x, y in shape.Points():  
             if inverse:  
                 x, y = inverse(x, y)  
             if forward:  
                 x, y = forward(x, y)  
             points.append(wxPoint(x * scale + offx,  
                                   -y * scale + offy))  
         return points  
   
     def draw_arc_shape(self, layer, index):  
         points = self.projected_points(layer, index)  
         self.dc.DrawLines(points)  
   
     def draw_point_shape(self, layer, index):  
         pp = self.projected_points(layer, index)  
   
         if len(pp) == 0: return # ignore Null Shapes which have no points  
   
         p = pp[0]  
         radius = self.resolution * 5  
         self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)  
   
     def draw_label_layer(self, layer):  
         scale = self.scale  
         offx, offy = self.offset  
   
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
91    
92          map_proj = self.map.projection      def label_font(self):
93          if map_proj is not None:          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
             forward = map_proj.Forward  
         else:  
             forward = None  
94    
95          for label in layer.Labels():      def draw_raster_data(self, data, format = 'BMP'):
96              x = label.x          stream = cStringIO.StringIO(data)
97              y = label.y          image = wxImageFromStream(stream, raster_format_map[format])
98              text = label.text          bitmap = wxBitmapFromImage(image)
99              if forward:          self.dc.DrawBitmap(bitmap, 0, 0)
                 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)  
100    
101    
102  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
103    
104      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
105      honor_visibility = 1      honor_visibility = 1
106        
107      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, selected_layer, selected_shapes):
108          """Render the map.          """Render the map.
109    
110          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
# Line 247  class ScreenRenderer(MapRenderer): Line 112  class ScreenRenderer(MapRenderer):
112          shapes given by the ids in selected_shapes in the          shapes given by the ids in selected_shapes in the
113          selected_layer.          selected_layer.
114          """          """
         self.update_region = region  
115          self.selected_layer = selected_layer          self.selected_layer = selected_layer
116          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
117          self.render_map(map)          self.render_map()
118    
119      def draw_shape_layer(self, layer):      def RenderMapIncrementally(self):
120          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:  
                 func = self.draw_polygon_shape  
                 args = (pen, brush)  
             elif shapetype == SHAPETYPE_ARC:  
                 func = self.draw_polygon_shape  
                 args = (pen, None)  
             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)  
121    
122              for index in self.selected_shapes:          Only the given region (a tuple in window coordinates as returned
123                  func(layer, index, *args)          by a wxrect's asTuple method) needs to be redrawn. Highlight the
124            shapes given by the ids in selected_shapes in the
125            selected_layer.
126            """
127            return self.render_map_incrementally()
128    
129      def layer_ids(self, layer):      def draw_selection_incrementally(self, layer, selected_shapes):
130            pen = wxPen(wxBLACK, 3, wxSOLID)
131            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
132    
133            shapetype = layer.ShapeType()
134            useraw, func, param = self.low_level_renderer(layer)
135            args = (pen, brush)
136            count = 0
137            for index in selected_shapes:
138                count += 1
139                shape = layer.Shape(index)
140                if useraw:
141                    data = shape.RawData()
142                else:
143                    data = shape.Points()
144                func(param, data, *args)
145                if count % 500 == 0:
146                    yield True
147    
148        def layer_shapes(self, layer):
149          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
150    
151          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 297  class ScreenRenderer(MapRenderer): Line 166  class ScreenRenderer(MapRenderer):
166          offx, offy = self.offset          offx, offy = self.offset
167          xs = []          xs = []
168          ys = []          ys = []
169          x, y, width, height = self.update_region          x, y, width, height = self.region
170          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
171                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
172              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 314  class ScreenRenderer(MapRenderer): Line 183  class ScreenRenderer(MapRenderer):
183          return layer.ShapesInRegion((left, bottom, right, top))          return layer.ShapesInRegion((left, bottom, right, top))
184    
185    
186  class PrinterRender(MapRenderer):  class ExportRenderer(ScreenRenderer):
187    
188        honor_visibility = 1
189    
190        def __init__(self, *args, **kw):
191            """Initialize the ExportRenderer.
192    
193            In addition to all parameters of the the ScreenRender
194            constructor, this class requires and additional keyword argument
195            destination_region with a tuple (minx, miny, maxx, maxy) giving
196            the region in dc coordinates which is to contain the map.
197            """
198            self.destination_region = kw["destination_region"]
199            del kw["destination_region"]
200            ScreenRenderer.__init__(self, *args, **kw)
201    
202        def RenderMap(self, selected_layer, selected_shapes):
203            """Render the map.
204    
205            The rendering device has been specified during initialisation.
206            The device border distance was set in
207            Thuban.UI.viewport.output_transform().
208    
209            RenderMap renders a frame set (one page frame, one around
210            legend/scalebar and one around the map), the map, the legend and
211            the scalebar on the given DC. The map is rendered with the
212            region displayed in the canvas view, centered on the area
213            available for map display.
214            """
215    
216            self.selected_layer = selected_layer
217            self.selected_shapes = selected_shapes
218    
219            # Get some dimensions
220            llx, lly, urx, ury = self.region
221            mminx, mminy, mmaxx, mmaxy = self.destination_region
222    
223      # When printing we want to see all layers          # Manipulate the offset to position the map
224      honor_visibility = 0          offx, offy = self.offset
225            # 1. Shift to corner of map drawing area
226            offx = offx + mminx
227            offy = offy + mminy
228    
229            # 2. Center the map on the map drawing area:
230            # region identifies the region on the canvas view:
231            # center of map drawing area - half the size of region: rendering origin
232            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
233            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
234    
235            self.offset = (offx+self.shiftx, offy+self.shifty)
236    
237            # Draw the map
238            self.dc.BeginDrawing()
239            self.dc.DestroyClippingRegion()
240            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
241                                      urx, ury)
242            self.render_map()
243            self.dc.EndDrawing()
244    
245            # Draw the rest (frames, legend, scalebar)
246            self.dc.BeginDrawing()
247            self.dc.DestroyClippingRegion()
248    
249            # Force the font for Legend drawing
250            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
251            self.dc.SetFont(font)
252    
253            self.render_frame()
254            self.render_legend()
255            self.render_scalebar()
256            self.dc.EndDrawing()
257    
258        def render_frame(self):
259            """Render the frames for map and legend/scalebar."""
260    
261            dc = self.dc
262            dc.SetPen(wxBLACK_PEN)
263            dc.SetBrush(wxTRANSPARENT_BRUSH)
264    
265            # Dimension stuff
266            width, height = dc.GetSizeTuple()
267            mminx, mminy, mmaxx, mmaxy = self.destination_region
268    
269            # Page Frame
270            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
271    
272            # Map Frame
273            llx, lly, urx, ury = self.region
274            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
275    
276            # Legend Frame
277            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
278    
279            dc.DestroyClippingRegion()
280            dc.SetClippingRegion(mmaxx+10,mminy,
281                                 (width-20) - (mmaxx+10), mmaxy-mminy)
282    
283        def render_legend(self):
284            """Render the legend on the Map."""
285    
286            previewer = ClassDataPreviewer()
287            dc = self.dc
288            dc.SetPen(wxBLACK_PEN)
289            dc.SetBrush(wxTRANSPARENT_BRUSH)
290    
291            # Dimension stuff
292            width, height = dc.GetSizeTuple()
293            mminx, mminy, mmaxx, mmaxy = self.destination_region
294            textwidth, textheight = dc.GetTextExtent("0")
295            iconwidth  = textheight
296            iconheight = textheight
297            stepy = textheight+3
298            dx = 10
299            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
300                                    # 5 pix inside legend frame
301            posy = mminy + 5        # 5 pix inside legend frame
302    
303            # Render the legend
304            dc.SetTextForeground(wxBLACK)
305            if self.map.HasLayers():
306                layers = self.map.Layers()[:]
307                layers.reverse()
308                for l in layers:
309                    if l.Visible():
310                        # Render title
311                        dc.DrawText(l.Title(), posx, posy)
312                        posy+=stepy
313                        if l.HasClassification():
314                            # Render classification
315                            clazz = l.GetClassification()
316                            shapeType = l.ShapeType()
317                            for g in clazz:
318                                if g.IsVisible():
319                                    previewer.Draw(dc,
320                                        wxRect(posx+dx, posy,
321                                               iconwidth, iconheight),
322                                        g.GetProperties(), shapeType)
323                                    dc.DrawText(g.GetDisplayText(),
324                                                posx+2*dx+iconwidth, posy)
325                                    posy+=stepy
326    
327        def render_scalebar(self):
328            """Render the scalebar."""
329    
330            scalebar = ScaleBar(self.map)
331    
332            # Dimension stuff
333            width, height = self.dc.GetSizeTuple()
334            mminx, mminy, mmaxx, mmaxy = self.destination_region
335    
336            # Render the scalebar
337            scalebar.DrawScaleBar(self.scale, self.dc,
338                                 (mmaxx+10+5, mmaxy-25),
339                                 ((width-15-5) - (mmaxx+10+5),20)
340                                )
341            # 10 pix between map and legend frame, 5 pix inside legend frame
342            # 25 pix from the legend frame bottom line
343            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
344            # Height: 20
345    
346    class PrinterRenderer(ExportRenderer):
347    
348        # Printing as well as Export / Screen display only the visible layer.
349        honor_visibility = 1
350    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.642  
changed lines
  Added in v.1927
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