/[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 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    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
24    
25  from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \  from wxproj import draw_polygon_shape, draw_polygon_init
      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  
      wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  
26    
27  from wxproj import draw_polygon_shape  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.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
32       SHAPETYPE_POINT       SHAPETYPE_POINT, RAW_SHAPEFILE
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
33    
34    from Thuban.Model.color import Transparent
35    import Thuban.Model.resource
36    
37  class MapRenderer:  from baserenderer import BaseRenderer
38    
39    class MapRenderer(BaseRenderer):
40    
41      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
42    
43      honor_visibility = 1      TRANSPARENT_PEN = wxTRANSPARENT_PEN
44        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
45    
46      def __init__(self, dc, scale, offset, resolution = 72.0,      make_point = wxPoint
                  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())  
47    
48      def draw_shape_layer(self, layer):      def tools_for_property(self, prop):
49          scale = self.scale          fill = prop.GetFill()
50          offx, offy = self.offset          if fill is Transparent:
51                brush = self.TRANSPARENT_BRUSH
52            else:
53                brush = wxBrush(Color2wxColour(fill), wxSOLID)
54    
55          fill = layer.fill          stroke = prop.GetLineColor()
56          if fill is None:          if stroke is Transparent:
57              brush = wxTRANSPARENT_BRUSH              pen = self.TRANSPARENT_PEN
58          else:          else:
59              color = wxColour(fill.red * 255,              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
60                               fill.green * 255,          return pen, brush
61                               fill.blue * 255)  
62              brush = wxBrush(color, wxSOLID)      def low_level_renderer(self, layer):
63          stroke = layer.stroke          """Override inherited method to provide more efficient renderers
64          stroke_width = layer.stroke_width  
65          if stroke is None:          If the underlying data format is not a shapefile or the layer
66              pen = wxTRANSPARENT_PEN          contains points shapes, simply use what the inherited method
67            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              color = wxColour(stroke.red * 255,              return BaseRenderer.low_level_renderer(self, layer)
83                               stroke.green * 255,  
84                               stroke.blue * 255)      def label_font(self):
85              pen = wxPen(color, stroke_width, wxSOLID)          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
86    
87          map_proj = self.map.projection      def draw_raster_data(self, data):
88          layer_proj = layer.projection          stream = cStringIO.StringIO(data)
89            image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
90            bitmap = wxBitmapFromImage(image)
91            self.dc.DrawBitmap(bitmap, 0, 0)
92    
93    
94    class ScreenRenderer(MapRenderer):
95    
96        # On the screen we want to see only visible layers by default
97        honor_visibility = 1
98    
99        def RenderMap(self, selected_layer, selected_shapes):
100            """Render the map.
101    
102            Only the given region (a tuple in window coordinates as returned
103            by a wxrect's asTuple method) needs to be redrawn. Highlight the
104            shapes given by the ids in selected_shapes in the
105            selected_layer.
106            """
107            self.selected_layer = selected_layer
108            self.selected_shapes = selected_shapes
109            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_selection_incrementally(self, layer, selected_shapes):
122            pen = wxPen(wxBLACK, 3, wxSOLID)
123            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
124    
125          shapetype = layer.ShapeType()          shapetype = layer.ShapeType()
126            useraw, func, param = self.low_level_renderer(layer)
127            args = (pen, brush)
128            count = 0
129            for index in selected_shapes:
130                count += 1
131                shape = layer.Shape(index)
132                if useraw:
133                    data = shape.RawData()
134                else:
135                    data = shape.Points()
136                func(param, data, *args)
137                if count % 500 == 0:
138                    yield True
139    
140          if shapetype == SHAPETYPE_POLYGON:      def layer_shapes(self, layer):
141              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)  
142    
143      def projected_points(self, layer, index):          Call the layer's ShapesInRegion method to determine the ids so
144            that it can use the quadtree.
145            """
146            # FIXME: the quad-tree should be built from the projected
147            # coordinates not the lat-long ones because it's not trivial to
148            # determine an appropriate rectangle in lat-long for a given
149            # rectangle in projected coordinates which we have to start from
150            # here.
151          proj = self.map.projection          proj = self.map.projection
152          if proj is not None:          if proj is not None:
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
153              inverse = proj.Inverse              inverse = proj.Inverse
154          else:          else:
155              inverse = None              inverse = None
156          shape = layer.Shape(index)  
         points = []  
157          scale = self.scale          scale = self.scale
158          offx, offy = self.offset          offx, offy = self.offset
159          for x, y in shape.Points():          xs = []
160            ys = []
161            x, y, width, height = self.region
162            for winx, winy in ((x, y), (x + width, y),
163                               (x + width, y + height), (x, y + height)):
164                px = (winx - offx) / scale
165                py = -(winy - offy) / scale
166              if inverse:              if inverse:
167                  x, y = inverse(x, y)                  px, py = inverse(px, py)
168              if forward:              xs.append(px)
169                  x, y = forward(x, y)              ys.append(py)
170              points.append(wxPoint(x * scale + offx,          left = min(xs)
171                                    -y * scale + offy))          right = max(xs)
172          return points          top = max(ys)
173            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)  
174    
175      def draw_label_layer(self, layer):          return layer.ShapesInRegion((left, bottom, right, top))
         scale = self.scale  
         offx, offy = self.offset  
176    
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
177    
178          map_proj = self.map.projection  class ExportRenderer(ScreenRenderer):
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
179    
180          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)  
181    
182        def __init__(self, *args, **kw):
183            """Initialize the ExportRenderer.
184    
185  class ScreenRenderer(MapRenderer):          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    
     # On the screen we want to see only visible layers by default  
     honor_visibility = 1  
       
     def RenderMap(self, map, selected_layer, selected_shape):  
208          self.selected_layer = selected_layer          self.selected_layer = selected_layer
209          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
         self.render_map(map)  
210    
211      def draw_shape_layer(self, layer):          # Get some dimensions
212          MapRenderer.draw_shape_layer(self, layer)          llx, lly, urx, ury = self.region
213          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)  
214    
215            # Manipulate the offset to position the map
216            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 PrinterRender(MapRenderer):  class PrinterRenderer(ExportRenderer):
339    
340      # When printing we want to see all layers      # Printing as well as Export / Screen display only the visible layer.
341      honor_visibility = 0      honor_visibility = 1
342    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.76  
changed lines
  Added in v.1866
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