/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
ViewVC logotype

Diff of /branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 394 by jonathan, Mon Feb 10 15:27:13 2003 UTC revision 1866 by bh, Mon Oct 27 13:01:58 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # 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, wxColour, 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 _
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
24    
25  from Thuban.Model.classification import Classification  from wxproj import draw_polygon_shape, draw_polygon_init
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
     """Class to render a map onto a wxDC"""  
33    
34      honor_visibility = 1  from Thuban.Model.color import Transparent
35    import Thuban.Model.resource
36    
37      def __init__(self, dc, scale, offset, resolution = 72.0,  from baserenderer import BaseRenderer
                  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  
         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())  
38    
39      def draw_shape_layer(self, layer):  class MapRenderer(BaseRenderer):
         scale = self.scale  
         offx, offy = self.offset  
40    
41          map_proj = self.map.projection      """Class to render a map onto a wxDC"""
         layer_proj = layer.projection  
   
         shapetype = layer.ShapeType()  
   
         brush = wxTRANSPARENT_BRUSH  
         pen   = wxTRANSPARENT_PEN  
   
         old_prop = None  
         for i in self.layer_ids(layer):  
             value = None  
             shape = layer.Shape(i)  
             lc = layer.classification  
             field = lc.field  
   
             if field is not None:  
                 record = layer.table.read_record(i)  
                 if record is not None:  
                     value = record[field]  
   
             #  
             # if the above statements fail 'value' should  
             # be null, at which point this call will  
             # at least retreive the NullData  
             #  
             prop = lc.GetProperties(value)  
   
             if prop != old_prop:  
                 old_prop = prop  
   
                 if shapetype == SHAPETYPE_ARC:  
                     fill = None  
                 else:  
                     fill = prop.GetFill()  
       
                 if fill is None:  
                     brush = wxTRANSPARENT_BRUSH  
                 else:  
                     color = wxColour(fill.red * 255,  
                                      fill.green * 255,  
                                      fill.blue * 255)  
                     brush = wxBrush(color, wxSOLID)  
       
                 stroke = prop.GetStroke()  
                 stroke_width = prop.GetStrokeWidth()  
                 if stroke is None:  
                     pen = wxTRANSPARENT_PEN  
                 else:  
                     color = wxColour(stroke.red * 255,  
                                      stroke.green * 255,  
                                      stroke.blue * 255)  
                     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)  
42    
43      def layer_ids(self, layer):      TRANSPARENT_PEN = wxTRANSPARENT_PEN
44          """Return the shape ids of the given layer that have to be drawn.      TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
           
         The default implementation simply returns all ids in the layer.  
         Override in derived classes to be more precise.  
         """  
         return range(layer.NumShapes())  
45    
46      def draw_polygon_shape(self, layer, index, pen, brush):      make_point = wxPoint
         offx, offy = self.offset          
         draw_polygon_shape(layer.shapefile.cobject(), index,  
                            self.dc, pen, brush,  
                            self.map.projection, layer.projection,  
                            self.scale, -self.scale, offx, offy)  
47    
48      def projected_points(self, layer, index):      def tools_for_property(self, prop):
49          proj = self.map.projection          fill = prop.GetFill()
50          if proj is not None:          if fill is Transparent:
51              forward = proj.Forward              brush = self.TRANSPARENT_BRUSH
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
             inverse = proj.Inverse  
52          else:          else:
53              inverse = None              brush = wxBrush(Color2wxColour(fill), wxSOLID)
         shape = layer.Shape(index)  
         points = []  
         scale = self.scale  
         offx, offy = self.offset  
         for x, y in shape.Points():  
             if inverse:  
                 x, y = inverse(x, y)  
             if forward:  
                 x, y = forward(x, y)  
             points.append(wxPoint(x * scale + offx,  
                                   -y * scale + offy))  
         return points  
   
     def draw_arc_shape(self, layer, index):  
         points = self.projected_points(layer, index)  
         self.dc.DrawLines(points)  
   
     def draw_point_shape(self, layer, index):  
         p = self.projected_points(layer, index)[0]  
         radius = self.resolution * 5  
         self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)  
54    
55      def draw_label_layer(self, layer):          stroke = prop.GetLineColor()
56          scale = self.scale          if stroke is Transparent:
57          offx, offy = self.offset              pen = self.TRANSPARENT_PEN
58            else:
59                pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
60            return pen, brush
61    
62          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)      def low_level_renderer(self, layer):
63          self.dc.SetFont(font)          """Override inherited method to provide more efficient renderers
64    
65          map_proj = self.map.projection          If the underlying data format is not a shapefile or the layer
66          if map_proj is not None:          contains points shapes, simply use what the inherited method
67              forward = map_proj.Forward          returns.
68    
69            Otherwise, i.e. for arc and polygon use the more efficient
70            wxproj.draw_polygon_shape and its corresponding parameter
71            created with wxproj.draw_polygon_init.
72            """
73            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
74                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
75                offx, offy = self.offset
76                return (True, draw_polygon_shape,
77                        draw_polygon_init(layer.ShapeStore().Shapefile(),
78                                          self.dc, self.map.projection,
79                                          layer.projection,
80                                          self.scale, -self.scale, offx, offy))
81          else:          else:
82              forward = None              return BaseRenderer.low_level_renderer(self, layer)
83    
84          for label in layer.Labels():      def label_font(self):
85              x = label.x          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
86              y = label.y  
87              text = label.text      def draw_raster_data(self, data):
88              if forward:          stream = cStringIO.StringIO(data)
89                  x, y = forward(x, y)          image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
90              x = x * scale + offx          bitmap = wxBitmapFromImage(image)
91              y = -y * scale + offy          self.dc.DrawBitmap(bitmap, 0, 0)
             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)  
92    
93    
94  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
95    
96      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
97      honor_visibility = 1      honor_visibility = 1
98        
99      def RenderMap(self, map, region, selected_layer, selected_shape):      def RenderMap(self, selected_layer, selected_shapes):
100          """Render the map.          """Render the map.
101    
102          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
103          by a wxrect's asTuple method) needs to be redrawn. Highlight the          by a wxrect's asTuple method) needs to be redrawn. Highlight the
104          shape with id selected_shape in the selected_layer.          shapes given by the ids in selected_shapes in the
105            selected_layer.
106          """          """
         self.update_region = region  
107          self.selected_layer = selected_layer          self.selected_layer = selected_layer
108          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
109          self.render_map(map)          self.render_map()
110    
111        def RenderMapIncrementally(self):
112            """Render the map.
113    
114            Only the given region (a tuple in window coordinates as returned
115            by a wxrect's asTuple method) needs to be redrawn. Highlight the
116            shapes given by the ids in selected_shapes in the
117            selected_layer.
118            """
119            return self.render_map_incrementally()
120    
121      def draw_shape_layer(self, layer):      def draw_selection_incrementally(self, layer, selected_shapes):
122          MapRenderer.draw_shape_layer(self, layer)          pen = wxPen(wxBLACK, 3, wxSOLID)
123          if layer is self.selected_layer and self.selected_shape is not None:          brush = wxBrush(wxBLACK, wxCROSS_HATCH)
124              pen = wxPen(wxBLACK, 3, wxSOLID)  
125              brush = wxBrush(wxBLACK, wxCROSS_HATCH)          shapetype = layer.ShapeType()
126                        useraw, func, param = self.low_level_renderer(layer)
127              shapetype = layer.ShapeType()          args = (pen, brush)
128              index = self.selected_shape          count = 0
129              if shapetype == SHAPETYPE_POLYGON:          for index in selected_shapes:
130                  self.draw_polygon_shape(layer, index, pen, brush)              count += 1
131              elif shapetype == SHAPETYPE_ARC:              shape = layer.Shape(index)
132                  self.draw_polygon_shape(layer, index, pen, None)              if useraw:
133                    data = shape.RawData()
134              else:              else:
135                  self.dc.SetBrush(brush)                  data = shape.Points()
136                  self.dc.SetPen(pen)              func(param, data, *args)
137                  if shapetype == SHAPETYPE_POINT:              if count % 500 == 0:
138                      self.draw_point_shape(layer, index)                  yield True
                 else:  
                     raise TypeError(_("Unhandled shape type %s") % shapetype)  
139    
140      def layer_ids(self, layer):      def layer_shapes(self, layer):
141          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
142    
143          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 272  class ScreenRenderer(MapRenderer): Line 158  class ScreenRenderer(MapRenderer):
158          offx, offy = self.offset          offx, offy = self.offset
159          xs = []          xs = []
160          ys = []          ys = []
161          x, y, width, height = self.update_region          x, y, width, height = self.region
162          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
163                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
164              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 289  class ScreenRenderer(MapRenderer): Line 175  class ScreenRenderer(MapRenderer):
175          return layer.ShapesInRegion((left, bottom, right, top))          return layer.ShapesInRegion((left, bottom, right, top))
176    
177    
178  class PrinterRender(MapRenderer):  class ExportRenderer(ScreenRenderer):
179    
180        honor_visibility = 1
181    
182        def __init__(self, *args, **kw):
183            """Initialize the ExportRenderer.
184    
185            In addition to all parameters of the the ScreenRender
186            constructor, this class requires and additional keyword argument
187            destination_region with a tuple (minx, miny, maxx, maxy) giving
188            the region in dc coordinates which is to contain the map.
189            """
190            self.destination_region = kw["destination_region"]
191            del kw["destination_region"]
192            ScreenRenderer.__init__(self, *args, **kw)
193    
194        def RenderMap(self, selected_layer, selected_shapes):
195            """Render the map.
196    
197            The rendering device has been specified during initialisation.
198            The device border distance was set in
199            Thuban.UI.viewport.output_transform().
200    
201            RenderMap renders a frame set (one page frame, one around
202            legend/scalebar and one around the map), the map, the legend and
203            the scalebar on the given DC. The map is rendered with the
204            region displayed in the canvas view, centered on the area
205            available for map display.
206            """
207    
208            self.selected_layer = selected_layer
209            self.selected_shapes = selected_shapes
210    
211            # Get some dimensions
212            llx, lly, urx, ury = self.region
213            mminx, mminy, mmaxx, mmaxy = self.destination_region
214    
215      # When printing we want to see all layers          # Manipulate the offset to position the map
216      honor_visibility = 0          offx, offy = self.offset
217            # 1. Shift to corner of map drawing area
218            offx = offx + mminx
219            offy = offy + mminy
220    
221            # 2. Center the map on the map drawing area:
222            # region identifies the region on the canvas view:
223            # center of map drawing area - half the size of region: rendering origin
224            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
225            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
226    
227            self.offset = (offx+self.shiftx, offy+self.shifty)
228    
229            # Draw the map
230            self.dc.BeginDrawing()
231            self.dc.DestroyClippingRegion()
232            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
233                                      urx, ury)
234            self.render_map()
235            self.dc.EndDrawing()
236    
237            # Draw the rest (frames, legend, scalebar)
238            self.dc.BeginDrawing()
239            self.dc.DestroyClippingRegion()
240    
241            # Force the font for Legend drawing
242            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
243            self.dc.SetFont(font)
244    
245            self.render_frame()
246            self.render_legend()
247            self.render_scalebar()
248            self.dc.EndDrawing()
249    
250        def render_frame(self):
251            """Render the frames for map and legend/scalebar."""
252    
253            dc = self.dc
254            dc.SetPen(wxBLACK_PEN)
255            dc.SetBrush(wxTRANSPARENT_BRUSH)
256    
257            # Dimension stuff
258            width, height = dc.GetSizeTuple()
259            mminx, mminy, mmaxx, mmaxy = self.destination_region
260    
261            # Page Frame
262            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
263    
264            # Map Frame
265            llx, lly, urx, ury = self.region
266            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
267    
268            # Legend Frame
269            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
270    
271            dc.DestroyClippingRegion()
272            dc.SetClippingRegion(mmaxx+10,mminy,
273                                 (width-20) - (mmaxx+10), mmaxy-mminy)
274    
275        def render_legend(self):
276            """Render the legend on the Map."""
277    
278            previewer = ClassDataPreviewer()
279            dc = self.dc
280            dc.SetPen(wxBLACK_PEN)
281            dc.SetBrush(wxTRANSPARENT_BRUSH)
282    
283            # Dimension stuff
284            width, height = dc.GetSizeTuple()
285            mminx, mminy, mmaxx, mmaxy = self.destination_region
286            textwidth, textheight = dc.GetTextExtent("0")
287            iconwidth  = textheight
288            iconheight = textheight
289            stepy = textheight+3
290            dx = 10
291            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
292                                    # 5 pix inside legend frame
293            posy = mminy + 5        # 5 pix inside legend frame
294    
295            # Render the legend
296            dc.SetTextForeground(wxBLACK)
297            if self.map.HasLayers():
298                layers = self.map.Layers()[:]
299                layers.reverse()
300                for l in layers:
301                    if l.Visible():
302                        # Render title
303                        dc.DrawText(l.Title(), posx, posy)
304                        posy+=stepy
305                        if l.HasClassification():
306                            # Render classification
307                            clazz = l.GetClassification()
308                            shapeType = l.ShapeType()
309                            for g in clazz:
310                                if g.IsVisible():
311                                    previewer.Draw(dc,
312                                        wxRect(posx+dx, posy,
313                                               iconwidth, iconheight),
314                                        g.GetProperties(), shapeType)
315                                    dc.DrawText(g.GetDisplayText(),
316                                                posx+2*dx+iconwidth, posy)
317                                    posy+=stepy
318    
319        def render_scalebar(self):
320            """Render the scalebar."""
321    
322            scalebar = ScaleBar(self.map)
323    
324            # Dimension stuff
325            width, height = self.dc.GetSizeTuple()
326            mminx, mminy, mmaxx, mmaxy = self.destination_region
327    
328            # Render the scalebar
329            scalebar.DrawScaleBar(self.scale, self.dc,
330                                 (mmaxx+10+5, mmaxy-25),
331                                 ((width-15-5) - (mmaxx+10+5),20)
332                                )
333            # 10 pix between map and legend frame, 5 pix inside legend frame
334            # 25 pix from the legend frame bottom line
335            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
336            # Height: 20
337    
338    class PrinterRenderer(ExportRenderer):
339    
340        # Printing as well as Export / Screen display only the visible layer.
341        honor_visibility = 1
342    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.394  
changed lines
  Added in v.1866
[email protected]
 ViewVC Help
Powered by ViewVC 1.1.26