/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 1927 by bh, Mon Nov 10 16:57:35 2003 UTC
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1  # Copyright (c) 2001 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,      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())  
55    
56      def draw_shape_layer(self, layer):      def tools_for_property(self, prop):
57          scale = self.scale          fill = prop.GetFill()
58          offx, offy = self.offset          if fill is Transparent:
59                brush = self.TRANSPARENT_BRUSH
60            else:
61                brush = wxBrush(Color2wxColour(fill), wxSOLID)
62    
63          fill = layer.fill          stroke = prop.GetLineColor()
64          if fill is None:          if stroke is Transparent:
65              brush = wxTRANSPARENT_BRUSH              pen = self.TRANSPARENT_PEN
66          else:          else:
67              color = wxColour(fill.red * 255,              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
68                               fill.green * 255,          return pen, brush
69                               fill.blue * 255)  
70              brush = wxBrush(color, wxSOLID)      def low_level_renderer(self, layer):
71          stroke = layer.stroke          """Override inherited method to provide more efficient renderers
72          if stroke is None:  
73              pen = wxTRANSPARENT_PEN          If the underlying data format is not a shapefile or the layer
74            contains points shapes, simply use what the inherited method
75            returns.
76    
77            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            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
82                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
83                offx, offy = self.offset
84                return (True, draw_polygon_shape,
85                        draw_polygon_init(layer.ShapeStore().Shapefile(),
86                                          self.dc, self.map.projection,
87                                          layer.projection,
88                                          self.scale, -self.scale, offx, offy))
89          else:          else:
90              color = wxColour(stroke.red * 255,              return BaseRenderer.low_level_renderer(self, layer)
                              stroke.green * 255,  
                              stroke.blue * 255)  
             pen = wxPen(color, 1, wxSOLID)  
91    
92          map_proj = self.map.projection      def label_font(self):
93          layer_proj = layer.projection          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
94    
95        def draw_raster_data(self, data, format = 'BMP'):
96            stream = cStringIO.StringIO(data)
97            image = wxImageFromStream(stream, raster_format_map[format])
98            bitmap = wxBitmapFromImage(image)
99            self.dc.DrawBitmap(bitmap, 0, 0)
100    
101    
102    class ScreenRenderer(MapRenderer):
103    
104        # On the screen we want to see only visible layers by default
105        honor_visibility = 1
106    
107        def RenderMap(self, selected_layer, selected_shapes):
108            """Render the map.
109    
110            Only the given region (a tuple in window coordinates as returned
111            by a wxrect's asTuple method) needs to be redrawn. Highlight the
112            shapes given by the ids in selected_shapes in the
113            selected_layer.
114            """
115            self.selected_layer = selected_layer
116            self.selected_shapes = selected_shapes
117            self.render_map()
118    
119        def RenderMapIncrementally(self):
120            """Render the map.
121    
122            Only the given region (a tuple in window coordinates as returned
123            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 draw_selection_incrementally(self, layer, selected_shapes):
130            pen = wxPen(wxBLACK, 3, wxSOLID)
131            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
132    
133          shapetype = layer.ShapeType()          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          if shapetype == SHAPETYPE_POLYGON:      def layer_shapes(self, layer):
149              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)  
150    
151      def projected_points(self, layer, index):          Call the layer's ShapesInRegion method to determine the ids so
152            that it can use the quadtree.
153            """
154            # FIXME: the quad-tree should be built from the projected
155            # coordinates not the lat-long ones because it's not trivial to
156            # determine an appropriate rectangle in lat-long for a given
157            # rectangle in projected coordinates which we have to start from
158            # here.
159          proj = self.map.projection          proj = self.map.projection
160          if proj is not None:          if proj is not None:
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
161              inverse = proj.Inverse              inverse = proj.Inverse
162          else:          else:
163              inverse = None              inverse = None
164          shape = layer.Shape(index)  
         points = []  
165          scale = self.scale          scale = self.scale
166          offx, offy = self.offset          offx, offy = self.offset
167          for x, y in shape.Points():          xs = []
168            ys = []
169            x, y, width, height = self.region
170            for winx, winy in ((x, y), (x + width, y),
171                               (x + width, y + height), (x, y + height)):
172                px = (winx - offx) / scale
173                py = -(winy - offy) / scale
174              if inverse:              if inverse:
175                  x, y = inverse(x, y)                  px, py = inverse(px, py)
176              if forward:              xs.append(px)
177                  x, y = forward(x, y)              ys.append(py)
178              points.append(wxPoint(x * scale + offx,          left = min(xs)
179                                    -y * scale + offy))          right = max(xs)
180          return points          top = max(ys)
181            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)  
182    
183      def draw_label_layer(self, layer):          return layer.ShapesInRegion((left, bottom, right, top))
         scale = self.scale  
         offx, offy = self.offset  
184    
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
185    
186          map_proj = self.map.projection  class ExportRenderer(ScreenRenderer):
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
187    
188          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)  
189    
190        def __init__(self, *args, **kw):
191            """Initialize the ExportRenderer.
192    
193  class ScreenRenderer(MapRenderer):          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    
     # On the screen we want to see only visible layers by default  
     honor_visibility = 1  
       
     def RenderMap(self, map, selected_layer, selected_shape):  
216          self.selected_layer = selected_layer          self.selected_layer = selected_layer
217          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
         self.render_map(map)  
218    
219      def draw_shape_layer(self, layer):          # Get some dimensions
220          MapRenderer.draw_shape_layer(self, layer)          llx, lly, urx, ury = self.region
221          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)  
222    
223            # Manipulate the offset to position the map
224            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 PrinterRender(MapRenderer):  class PrinterRenderer(ExportRenderer):
347    
348      # When printing we want to see all layers      # Printing as well as Export / Screen display only the visible layer.
349      honor_visibility = 0      honor_visibility = 1
350    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.6  
changed lines
  Added in v.1927
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