/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 76 by bh, Mon Feb 4 19:23:30 2002 UTC revision 1937 by bh, Tue Nov 11 18:16:42 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    from __future__ import generators
11    
12  __version__ = "$Revision$"  __version__ = "$Revision$"
13    # $Source$
14    # $Id$
15    
16    import cStringIO
17    
18    from Thuban import _
19    
20    from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
21        wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
22        wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
23        wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, wxBITMAP_TYPE_JPEG
24    
25    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    from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
32         SHAPETYPE_POINT, RAW_SHAPEFILE
33    
34  from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \  from Thuban.Model.color import Transparent
35       wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  import Thuban.Model.resource
      wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  
36    
37  from wxproj import draw_polygon_shape  from baserenderer import BaseRenderer
38    
 from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  
      SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
39    
40    # Map the strings used for the format parameter of the draw_raster_data
41    # method to the appropriate wxWindows constants
42    raster_format_map = {
43        "BMP": wxBITMAP_TYPE_BMP,
44        "JPEG": wxBITMAP_TYPE_JPEG,
45        }
46    
47  class MapRenderer:  class MapRenderer(BaseRenderer):
48    
49      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
50    
51      honor_visibility = 1      TRANSPARENT_PEN = wxTRANSPARENT_PEN
52        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
53    
54      def __init__(self, dc, scale, offset, resolution = 72.0,      def make_point(self, x, y):
55                   honor_visibility = None):          return wxPoint(int(round(x)), int(round(y)))
         """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())  
56    
57      def draw_shape_layer(self, layer):      def tools_for_property(self, prop):
58          scale = self.scale          fill = prop.GetFill()
59          offx, offy = self.offset          if fill is Transparent:
60                brush = self.TRANSPARENT_BRUSH
61            else:
62                brush = wxBrush(Color2wxColour(fill), wxSOLID)
63    
64          fill = layer.fill          stroke = prop.GetLineColor()
65          if fill is None:          if stroke is Transparent:
66              brush = wxTRANSPARENT_BRUSH              pen = self.TRANSPARENT_PEN
67          else:          else:
68              color = wxColour(fill.red * 255,              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
69                               fill.green * 255,          return pen, brush
70                               fill.blue * 255)  
71              brush = wxBrush(color, wxSOLID)      def low_level_renderer(self, layer):
72          stroke = layer.stroke          """Override inherited method to provide more efficient renderers
73          stroke_width = layer.stroke_width  
74          if stroke is None:          If the underlying data format is not a shapefile or the layer
75              pen = wxTRANSPARENT_PEN          contains points shapes, simply use what the inherited method
76            returns.
77    
78            Otherwise, i.e. for arc and polygon use the more efficient
79            wxproj.draw_polygon_shape and its corresponding parameter
80            created with wxproj.draw_polygon_init.
81            """
82            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
83                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
84                offx, offy = self.offset
85                return (True, draw_polygon_shape,
86                        draw_polygon_init(layer.ShapeStore().Shapefile(),
87                                          self.dc, self.map.projection,
88                                          layer.projection,
89                                          self.scale, -self.scale, offx, offy))
90          else:          else:
91              color = wxColour(stroke.red * 255,              return BaseRenderer.low_level_renderer(self, layer)
92                               stroke.green * 255,  
93                               stroke.blue * 255)      def label_font(self):
94              pen = wxPen(color, stroke_width, wxSOLID)          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
95                          wxNORMAL)
96    
97        def draw_raster_data(self, data, format = 'BMP'):
98            stream = cStringIO.StringIO(data)
99            image = wxImageFromStream(stream, raster_format_map[format])
100            bitmap = wxBitmapFromImage(image)
101            self.dc.DrawBitmap(bitmap, 0, 0)
102    
103    
104    class ScreenRenderer(MapRenderer):
105    
106        # On the screen we want to see only visible layers by default
107        honor_visibility = 1
108    
109        def RenderMap(self, selected_layer, selected_shapes):
110            """Render the map.
111    
112            Only the given region (a tuple in window coordinates as returned
113            by a wxrect's asTuple method) needs to be redrawn. Highlight the
114            shapes given by the ids in selected_shapes in the
115            selected_layer.
116            """
117            self.selected_layer = selected_layer
118            self.selected_shapes = selected_shapes
119            self.render_map()
120    
121        def RenderMapIncrementally(self):
122            """Render the map.
123    
124          map_proj = self.map.projection          Only the given region (a tuple in window coordinates as returned
125          layer_proj = layer.projection          by a wxrect's asTuple method) needs to be redrawn. Highlight the
126            shapes given by the ids in selected_shapes in the
127            selected_layer.
128            """
129            return self.render_map_incrementally()
130    
131        def draw_selection_incrementally(self, layer, selected_shapes):
132            pen = wxPen(wxBLACK, 3, wxSOLID)
133            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
134    
135          shapetype = layer.ShapeType()          shapetype = layer.ShapeType()
136            useraw, func, param = self.low_level_renderer(layer)
137            args = (pen, brush)
138            count = 0
139            for index in selected_shapes:
140                count += 1
141                shape = layer.Shape(index)
142                if useraw:
143                    data = shape.RawData()
144                else:
145                    data = shape.Points()
146                func(param, data, *args)
147                if count % 500 == 0:
148                    yield True
149    
150          if shapetype == SHAPETYPE_POLYGON:      def layer_shapes(self, layer):
151              for i in range(layer.NumShapes()):          """Return the shapeids covered by the region that has to be redrawn
                 self.draw_polygon_shape(layer, i, pen, brush)  
         else:  
             self.dc.SetBrush(brush)  
             self.dc.SetPen(pen)  
             if shapetype == SHAPETYPE_ARC:  
                 f = self.draw_arc_shape  
             elif shapetype == SHAPETYPE_POINT:  
                 f = self.draw_point_shape  
             for i in range(layer.NumShapes()):  
                 f(layer, i)  
   
     def draw_polygon_shape(self, layer, index, pen, brush):  
         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)  
152    
153      def projected_points(self, layer, index):          Call the layer's ShapesInRegion method to determine the ids so
154            that it can use the quadtree.
155            """
156            # FIXME: the quad-tree should be built from the projected
157            # coordinates not the lat-long ones because it's not trivial to
158            # determine an appropriate rectangle in lat-long for a given
159            # rectangle in projected coordinates which we have to start from
160            # here.
161          proj = self.map.projection          proj = self.map.projection
162          if proj is not None:          if proj is not None:
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
163              inverse = proj.Inverse              inverse = proj.Inverse
164          else:          else:
165              inverse = None              inverse = None
166          shape = layer.Shape(index)  
         points = []  
167          scale = self.scale          scale = self.scale
168          offx, offy = self.offset          offx, offy = self.offset
169          for x, y in shape.Points():          xs = []
170            ys = []
171            x, y, width, height = self.region
172            for winx, winy in ((x, y), (x + width, y),
173                               (x + width, y + height), (x, y + height)):
174                px = (winx - offx) / scale
175                py = -(winy - offy) / scale
176              if inverse:              if inverse:
177                  x, y = inverse(x, y)                  px, py = inverse(px, py)
178              if forward:              xs.append(px)
179                  x, y = forward(x, y)              ys.append(py)
180              points.append(wxPoint(x * scale + offx,          left = min(xs)
181                                    -y * scale + offy))          right = max(xs)
182          return points          top = max(ys)
183            bottom = min(ys)
     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)  
184    
185      def draw_label_layer(self, layer):          return layer.ShapesInRegion((left, bottom, right, top))
         scale = self.scale  
         offx, offy = self.offset  
186    
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
187    
188          map_proj = self.map.projection  class ExportRenderer(ScreenRenderer):
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
189    
190          for label in layer.Labels():      honor_visibility = 1
             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)  
191    
192        def __init__(self, *args, **kw):
193            """Initialize the ExportRenderer.
194    
195  class ScreenRenderer(MapRenderer):          In addition to all parameters of the the ScreenRender
196            constructor, this class requires and additional keyword argument
197            destination_region with a tuple (minx, miny, maxx, maxy) giving
198            the region in dc coordinates which is to contain the map.
199            """
200            self.destination_region = kw["destination_region"]
201            del kw["destination_region"]
202            ScreenRenderer.__init__(self, *args, **kw)
203    
204        def RenderMap(self, selected_layer, selected_shapes):
205            """Render the map.
206    
207            The rendering device has been specified during initialisation.
208            The device border distance was set in
209            Thuban.UI.viewport.output_transform().
210    
211            RenderMap renders a frame set (one page frame, one around
212            legend/scalebar and one around the map), the map, the legend and
213            the scalebar on the given DC. The map is rendered with the
214            region displayed in the canvas view, centered on the area
215            available for map display.
216            """
217    
     # On the screen we want to see only visible layers by default  
     honor_visibility = 1  
       
     def RenderMap(self, map, selected_layer, selected_shape):  
218          self.selected_layer = selected_layer          self.selected_layer = selected_layer
219          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
         self.render_map(map)  
220    
221      def draw_shape_layer(self, layer):          # Get some dimensions
222          MapRenderer.draw_shape_layer(self, layer)          llx, lly, urx, ury = self.region
223          if layer is self.selected_layer and self.selected_shape is not None:          mminx, mminy, mmaxx, mmaxy = self.destination_region
             pen = wxPen(wxBLACK, 3, wxSOLID)  
             brush = wxBrush(wxBLACK, wxCROSS_HATCH)  
               
             shapetype = layer.ShapeType()  
             index = self.selected_shape  
             if shapetype == SHAPETYPE_POLYGON:  
                 self.draw_polygon_shape(layer, index, pen, brush)  
             else:  
                 self.dc.SetBrush(brush)  
                 self.dc.SetPen(pen)  
                 if shapetype == SHAPETYPE_ARC:  
                     f = self.draw_arc_shape  
                 elif shapetype == SHAPETYPE_POINT:  
                     f = self.draw_point_shape  
                 f(layer, index)  
224    
225            # Manipulate the offset to position the map
226            offx, offy = self.offset
227            # 1. Shift to corner of map drawing area
228            offx = offx + mminx
229            offy = offy + mminy
230    
231            # 2. Center the map on the map drawing area:
232            # region identifies the region on the canvas view:
233            # center of map drawing area - half the size of region: rendering origin
234            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
235            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
236    
237            self.offset = (offx+self.shiftx, offy+self.shifty)
238    
239            # Draw the map
240            self.dc.BeginDrawing()
241            self.dc.DestroyClippingRegion()
242            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
243                                      urx, ury)
244            self.render_map()
245            self.dc.EndDrawing()
246    
247            # Draw the rest (frames, legend, scalebar)
248            self.dc.BeginDrawing()
249            self.dc.DestroyClippingRegion()
250    
251            # Force the font for Legend drawing
252            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
253            self.dc.SetFont(font)
254    
255            self.render_frame()
256            self.render_legend()
257            self.render_scalebar()
258            self.dc.EndDrawing()
259    
260        def render_frame(self):
261            """Render the frames for map and legend/scalebar."""
262    
263            dc = self.dc
264            dc.SetPen(wxBLACK_PEN)
265            dc.SetBrush(wxTRANSPARENT_BRUSH)
266    
267            # Dimension stuff
268            width, height = dc.GetSizeTuple()
269            mminx, mminy, mmaxx, mmaxy = self.destination_region
270    
271            # Page Frame
272            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
273    
274            # Map Frame
275            llx, lly, urx, ury = self.region
276            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
277    
278            # Legend Frame
279            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
280    
281            dc.DestroyClippingRegion()
282            dc.SetClippingRegion(mmaxx+10,mminy,
283                                 (width-20) - (mmaxx+10), mmaxy-mminy)
284    
285        def render_legend(self):
286            """Render the legend on the Map."""
287    
288            previewer = ClassDataPreviewer()
289            dc = self.dc
290            dc.SetPen(wxBLACK_PEN)
291            dc.SetBrush(wxTRANSPARENT_BRUSH)
292    
293            # Dimension stuff
294            width, height = dc.GetSizeTuple()
295            mminx, mminy, mmaxx, mmaxy = self.destination_region
296            textwidth, textheight = dc.GetTextExtent("0")
297            iconwidth  = textheight
298            iconheight = textheight
299            stepy = textheight+3
300            dx = 10
301            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
302                                    # 5 pix inside legend frame
303            posy = mminy + 5        # 5 pix inside legend frame
304    
305            # Render the legend
306            dc.SetTextForeground(wxBLACK)
307            if self.map.HasLayers():
308                layers = self.map.Layers()[:]
309                layers.reverse()
310                for l in layers:
311                    if l.Visible():
312                        # Render title
313                        dc.DrawText(l.Title(), posx, posy)
314                        posy+=stepy
315                        if l.HasClassification():
316                            # Render classification
317                            clazz = l.GetClassification()
318                            shapeType = l.ShapeType()
319                            for g in clazz:
320                                if g.IsVisible():
321                                    previewer.Draw(dc,
322                                        wxRect(posx+dx, posy,
323                                               iconwidth, iconheight),
324                                        g.GetProperties(), shapeType)
325                                    dc.DrawText(g.GetDisplayText(),
326                                                posx+2*dx+iconwidth, posy)
327                                    posy+=stepy
328    
329        def render_scalebar(self):
330            """Render the scalebar."""
331    
332            scalebar = ScaleBar(self.map)
333    
334            # Dimension stuff
335            width, height = self.dc.GetSizeTuple()
336            mminx, mminy, mmaxx, mmaxy = self.destination_region
337    
338            # Render the scalebar
339            scalebar.DrawScaleBar(self.scale, self.dc,
340                                 (mmaxx+10+5, mmaxy-25),
341                                 ((width-15-5) - (mmaxx+10+5),20)
342                                )
343            # 10 pix between map and legend frame, 5 pix inside legend frame
344            # 25 pix from the legend frame bottom line
345            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
346            # Height: 20
347    
348  class PrinterRender(MapRenderer):  class PrinterRenderer(ExportRenderer):
349    
350      # When printing we want to see all layers      # Printing as well as Export / Screen display only the visible layer.
351      honor_visibility = 0      honor_visibility = 1
352    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.76  
changed lines
  Added in v.1937
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