/[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 2635 by jan, Tue Jun 28 06:48:45 2005 UTC
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1  # Copyright (c) 2001 by Intevation GmbH  # Copyright (c) 2001-2005 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]> (2001-2003)
4    # Jonathan Coles <[email protected]> (2003)
5    # Frank Koormann <[email protected]> (2003)
6    # Jan-Oliver Wagner <[email protected]> (2003-2005)
7  #  #
8  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
9  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
10    
11    from __future__ import generators
12    
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    # $Source$
15    # $Id$
16    
17    import cStringIO
18    
19    import array
20    
21    import traceback
22    
23    from Thuban import _
24    
25    from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
26        wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
27        wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
28        wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, \
29        wxBITMAP_TYPE_JPEG, wxBITMAP_TYPE_PNG, wxBITMAP_TYPE_TIF, \
30        wxBITMAP_TYPE_GIF, wxEmptyImage, wxMask, wxBitmapFromBits
31    
32    from wxproj import draw_polygon_shape, draw_polygon_init
33    
34    from Thuban.UI.common import Color2wxColour
35    from Thuban.UI.classifier import ClassDataPreviewer
36    from Thuban.UI.scalebar import ScaleBar
37    
38    from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
39         SHAPETYPE_POINT, RAW_SHAPEFILE
40    
41    from Thuban.Model.color import Transparent
42    import Thuban.Model.resource
43    
44  from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \  from baserenderer import BaseRenderer
      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  
      wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  
45    
46  from wxproj import draw_polygon_shape  from math import floor
47    
48  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from types import StringType
      SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
49    
50    from Thuban.version import versions
51    
52  class MapRenderer:  if Thuban.Model.resource.has_gdal_support():
53        from gdalwarp import ProjectRasterFile
54    
55    
56    # Map the strings used for the format parameter of the draw_raster_data
57    # method to the appropriate wxWindows constants
58    raster_format_map = {
59        "BMP": wxBITMAP_TYPE_BMP,
60        "JPEG": wxBITMAP_TYPE_JPEG,
61        "PNG": wxBITMAP_TYPE_PNG,
62        "TIFF": wxBITMAP_TYPE_TIF,
63        "GIF": wxBITMAP_TYPE_GIF,
64        }
65    
66    class MapRenderer(BaseRenderer):
67    
68      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
69    
70      honor_visibility = 1      TRANSPARENT_PEN = wxTRANSPARENT_PEN
71        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
72    
73      def __init__(self, dc, scale, offset, resolution = 72.0,      def make_point(self, x, y):
74                   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())  
75    
76      def draw_shape_layer(self, layer):      def tools_for_property(self, prop):
77          scale = self.scale          fill = prop.GetFill()
78          offx, offy = self.offset          if fill is Transparent:
79                brush = self.TRANSPARENT_BRUSH
80            else:
81                brush = wxBrush(Color2wxColour(fill), wxSOLID)
82    
83          fill = layer.fill          stroke = prop.GetLineColor()
84          if fill is None:          if stroke is Transparent:
85              brush = wxTRANSPARENT_BRUSH              pen = self.TRANSPARENT_PEN
86          else:          else:
87              color = wxColour(fill.red * 255,              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
88                               fill.green * 255,          return pen, brush
89                               fill.blue * 255)  
90              brush = wxBrush(color, wxSOLID)      def low_level_renderer(self, layer):
91          stroke = layer.stroke          """Override inherited method to provide more efficient renderers
92          if stroke is None:  
93              pen = wxTRANSPARENT_PEN          If the underlying data format is not a shapefile or the layer
94            contains points shapes, simply use what the inherited method
95            returns.
96    
97            Otherwise, i.e. for arc and polygon use the more efficient
98            wxproj.draw_polygon_shape and its corresponding parameter
99            created with wxproj.draw_polygon_init.
100            """
101            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
102                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
103                offx, offy = self.offset
104                x = lambda a, b, c, d: None
105                #return (True, x, None)
106                return (True, draw_polygon_shape,
107                        draw_polygon_init(layer.ShapeStore().Shapefile(),
108                                          self.dc, self.map.projection,
109                                          layer.projection,
110                                          self.scale, -self.scale, offx, offy))
111          else:          else:
112              color = wxColour(stroke.red * 255,              return BaseRenderer.low_level_renderer(self, layer)
                              stroke.green * 255,  
                              stroke.blue * 255)  
             pen = wxPen(color, 1, wxSOLID)  
113    
114          map_proj = self.map.projection      def label_font(self):
115          layer_proj = layer.projection          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
116                          wxNORMAL)
117    
118        def projected_raster_layer(self, layer, srcProj, dstProj, extents,
119                                   resolution, dimensions, options):
120            """Returns a raster layer image in projected space
121    
122          shapetype = layer.ShapeType()          Based on a given filename.  This method must be implemented in
123            classes derived from BaseRenderer.
124            """
125    
126            ret = None
127    
128            if Thuban.Model.resource.has_gdal_support():
129    
130                if versions['wxPython-tuple'] < (2,5,3):
131                    options = options | 4  # INVERT_MASK_BITS
132                    options = options & ~2 # ALPHA_MASK not supported
133    
134                try:
135                    ret = ProjectRasterFile(layer.GetImageFilename(),
136                                            srcProj, dstProj,
137                                            extents, resolution, dimensions,
138                                            options)
139                except (MemoryError, IOError, AttributeError, ValueError):
140                    # Why does this catch AttributeError and ValueError?
141                    # FIXME: The exception should be communicated to the user
142                    # better.
143                    traceback.print_exc()
144    
145            return ret
146    
147        def draw_raster_data(self, x,y, data, format = 'BMP', opacity=1.0):
148    
149            mask = None
150            alpha = None
151            width = data[0]
152            height = data[1]
153            image_data, mask_data, alpha_data = data[2]
154    
155            if versions['wxPython-tuple'] < (2,5,3):
156                alpha_data = None
157    
158            if format == 'RAW':
159                image = wxEmptyImage(width, height)
160                image.SetData(image_data)
161                if mask_data is not None:
162                    mask = wxBitmapFromBits(mask_data, width, height, 1)
163                    mask = wxMask(mask)
164                elif alpha_data is not None:
165                    # alpha_data is already in the right format
166                    alpha = alpha_data
167    
         if shapetype == SHAPETYPE_POLYGON:  
             for i in range(layer.NumShapes()):  
                 self.draw_polygon_shape(layer, i, pen, brush)  
168          else:          else:
169              self.dc.SetBrush(brush)              stream = cStringIO.StringIO(image_data)
170              self.dc.SetPen(pen)              image = wxImageFromStream(stream, raster_format_map[format])
171              if shapetype == SHAPETYPE_ARC:  
172                  f = self.draw_arc_shape              if mask_data is not None:
173              elif shapetype == SHAPETYPE_POINT:                  stream = cStringIO.StringIO(mask_data)
174                  f = self.draw_point_shape                  mask = wxImageFromStream(stream, raster_format_map[format])
175              for i in range(layer.NumShapes()):                  mask = wxMask(wxBitmapFromImage(mask, 1))
176                  f(layer, i)              elif alpha_data is not None:
177                    stream = cStringIO.StringIO(alpha_data)
178      def draw_polygon_shape(self, layer, index, pen, brush):                  alpha = wxImageFromStream(stream, raster_format_map[format])
179          offx, offy = self.offset                          alpha = alpha.GetData() #[:] # XXX: do we need to copy this?
180          draw_polygon_shape(layer.shapefile.cobject(), index,              elif image.HasAlpha():
181                             self.dc, pen, brush,                  alpha = image.GetAlphaData()
182                             self.map.projection, layer.projection,  
183                             self.scale, -self.scale, offx, offy)          #
184            # scale down the alpha values the opacity level using a string
185            # translation table for efficiency.
186            #
187            if alpha is not None:
188                if opacity == 0:
189                    return
190                elif opacity == 1:
191                    a = alpha
192                else:
193                    tr = [int(i*opacity) for i in range(256)]
194                    table = array.array('B', tr).tostring()
195                    a = alpha.translate(table)
196    
197                image.SetAlphaData(a)
198    
199            bitmap = wxBitmapFromImage(image)
200    
201            if mask is not None:
202                bitmap.SetMask(mask)
203    
204            self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
205    
206    
207    class ScreenRenderer(MapRenderer):
208    
209        # On the screen we want to see only visible layers by default
210        honor_visibility = 1
211    
212      def projected_points(self, layer, index):      def RenderMap(self, selected_layer, selected_shapes):
213            """Render the map.
214    
215            Only the given region (a tuple in window coordinates as returned
216            by a wxrect's asTuple method) needs to be redrawn. Highlight the
217            shapes given by the ids in selected_shapes in the
218            selected_layer.
219            """
220            self.selected_layer = selected_layer
221            self.selected_shapes = selected_shapes
222            self.render_map()
223    
224        def RenderMapIncrementally(self):
225            """Render the map.
226    
227            Only the given region (a tuple in window coordinates as returned
228            by a wxrect's asTuple method) needs to be redrawn. Highlight the
229            shapes given by the ids in selected_shapes in the
230            selected_layer.
231            """
232            return self.render_map_incrementally()
233    
234        def draw_selection_incrementally(self, layer, selected_shapes):
235            """Draw the selected shapes in a emphasized way (i.e.
236            with a special pen and brush.
237            The drawing is performed incrementally, that means every
238            n shapes, the user can have interactions with the map.
239            n is currently fixed to 500.
240    
241            layer -- the layer where the shapes belong to.
242            selected_shapes -- a list of the shape-ids representing the
243                               selected shapes for the given layer.
244            """
245            pen = wxPen(wxBLACK, 3, wxSOLID)
246            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
247    
248            shapetype = layer.ShapeType()
249            useraw, func, param = self.low_level_renderer(layer)
250            args = (pen, brush)
251    
252            # for point shapes we need to find out the properties
253            # to determine the size. Based on table and field,
254            # we can find out the properties for object - see below.
255            if shapetype == SHAPETYPE_POINT:
256                lc = layer.GetClassification()
257                field = layer.GetClassificationColumn()
258                table = layer.ShapeStore().Table()
259    
260            count = 0
261            for index in selected_shapes:
262                count += 1
263                shape = layer.Shape(index)
264    
265                # Get the size of the specific property for this
266                # point
267                if shapetype == SHAPETYPE_POINT:
268                    if field is not None:
269                        value = table.ReadValue(shape.ShapeID(), field)
270                        group = lc.FindGroup(value)
271                        size = group.GetProperties().GetSize()
272                    else:
273                        size = lc.GetDefaultSize()
274                    args = (pen, brush, size)
275    
276                if useraw:
277                    data = shape.RawData()
278                else:
279                    data = shape.Points()
280                func(param, data, *args)
281                if count % 500 == 0:
282                    yield True
283    
284        def layer_shapes(self, layer):
285            """Return the shapeids covered by the region that has to be redrawn
286    
287            Call the layer's ShapesInRegion method to determine the ids so
288            that it can use the quadtree.
289            """
290            # FIXME: the quad-tree should be built from the projected
291            # coordinates not the lat-long ones because it's not trivial to
292            # determine an appropriate rectangle in lat-long for a given
293            # rectangle in projected coordinates which we have to start from
294            # here.
295          proj = self.map.projection          proj = self.map.projection
296          if proj is not None:          if proj is not None:
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
297              inverse = proj.Inverse              inverse = proj.Inverse
298          else:          else:
299              inverse = None              inverse = None
300          shape = layer.Shape(index)  
         points = []  
301          scale = self.scale          scale = self.scale
302          offx, offy = self.offset          offx, offy = self.offset
303          for x, y in shape.Points():          xs = []
304            ys = []
305            x, y, width, height = self.region
306            for winx, winy in ((x, y), (x + width, y),
307                               (x + width, y + height), (x, y + height)):
308                px = (winx - offx) / scale
309                py = -(winy - offy) / scale
310              if inverse:              if inverse:
311                  x, y = inverse(x, y)                  px, py = inverse(px, py)
312              if forward:              xs.append(px)
313                  x, y = forward(x, y)              ys.append(py)
314              points.append(wxPoint(x * scale + offx,          left = min(xs)
315                                    -y * scale + offy))          right = max(xs)
316          return points          top = max(ys)
317            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)  
318    
319      def draw_label_layer(self, layer):          return layer.ShapesInRegion((left, bottom, right, top))
         scale = self.scale  
         offx, offy = self.offset  
320    
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
321    
322          map_proj = self.map.projection  class ExportRenderer(ScreenRenderer):
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
323    
324          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)  
325    
326        def __init__(self, *args, **kw):
327            """Initialize the ExportRenderer.
328    
329  class ScreenRenderer(MapRenderer):          In addition to all parameters of the the ScreenRender
330            constructor, this class requires and additional keyword argument
331            destination_region with a tuple (minx, miny, maxx, maxy) giving
332            the region in dc coordinates which is to contain the map.
333            """
334            self.destination_region = kw["destination_region"]
335            del kw["destination_region"]
336            ScreenRenderer.__init__(self, *args, **kw)
337    
338        def RenderMap(self, selected_layer, selected_shapes):
339            """Render the map.
340    
341            The rendering device has been specified during initialisation.
342            The device border distance was set in
343            Thuban.UI.viewport.output_transform().
344    
345            RenderMap renders a frame set (one page frame, one around
346            legend/scalebar and one around the map), the map, the legend and
347            the scalebar on the given DC. The map is rendered with the
348            region displayed in the canvas view, centered on the area
349            available for map display.
350            """
351    
     # On the screen we want to see only visible layers by default  
     honor_visibility = 1  
       
     def RenderMap(self, map, selected_layer, selected_shape):  
352          self.selected_layer = selected_layer          self.selected_layer = selected_layer
353          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
         self.render_map(map)  
354    
355      def draw_shape_layer(self, layer):          # Get some dimensions
356          MapRenderer.draw_shape_layer(self, layer)          llx, lly, urx, ury = self.region
357          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)  
358    
359            # Manipulate the offset to position the map
360            offx, offy = self.offset
361            # 1. Shift to corner of map drawing area
362            offx = offx + mminx
363            offy = offy + mminy
364    
365            # 2. Center the map on the map drawing area:
366            # region identifies the region on the canvas view:
367            # center of map drawing area - half the size of region: rendering origin
368            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
369            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
370    
371            self.offset = (offx+self.shiftx, offy+self.shifty)
372            self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)
373    
374            # Draw the map
375            self.dc.BeginDrawing()
376            self.dc.DestroyClippingRegion()
377            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
378                                      urx, ury)
379            self.render_map()
380            self.dc.EndDrawing()
381    
382            # Draw the rest (frames, legend, scalebar)
383            self.dc.BeginDrawing()
384            self.dc.DestroyClippingRegion()
385    
386  class PrinterRender(MapRenderer):          # Force the font for Legend drawing
387            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
388            self.dc.SetFont(font)
389    
390            self.render_frame()
391            self.render_legend()
392            self.render_scalebar()
393            self.dc.EndDrawing()
394    
395        def render_frame(self):
396            """Render the frames for map and legend/scalebar."""
397    
398            dc = self.dc
399            dc.SetPen(wxBLACK_PEN)
400            dc.SetBrush(wxTRANSPARENT_BRUSH)
401    
402            # Dimension stuff
403            width, height = dc.GetSizeTuple()
404            mminx, mminy, mmaxx, mmaxy = self.destination_region
405    
406            # Page Frame
407            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
408    
409            # Map Frame
410            llx, lly, urx, ury = self.region
411            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
412    
413            # Legend Frame
414            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
415    
416            dc.DestroyClippingRegion()
417            dc.SetClippingRegion(mmaxx+10,mminy,
418                                 (width-20) - (mmaxx+10), mmaxy-mminy)
419    
420        def render_legend(self):
421            """Render the legend on the Map."""
422    
423            previewer = ClassDataPreviewer()
424            dc = self.dc
425            dc.SetPen(wxBLACK_PEN)
426            dc.SetBrush(wxTRANSPARENT_BRUSH)
427    
428            # Dimension stuff
429            width, height = dc.GetSizeTuple()
430            mminx, mminy, mmaxx, mmaxy = self.destination_region
431            textwidth, textheight = dc.GetTextExtent("0")
432            iconwidth  = textheight
433            iconheight = textheight
434            stepy = textheight+3
435            dx = 10
436            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
437                                    # 5 pix inside legend frame
438            posy = mminy + 5        # 5 pix inside legend frame
439    
440            # Render the legend
441            dc.SetTextForeground(wxBLACK)
442            if self.map.HasLayers():
443                layers = self.map.Layers()[:]
444                layers.reverse()
445                for l in layers:
446                    if l.Visible():
447                        # Render title
448                        dc.DrawText(l.Title(), posx, posy)
449                        posy+=stepy
450                        if l.HasClassification():
451                            # Render classification
452                            clazz = l.GetClassification()
453                            shapeType = l.ShapeType()
454                            for g in clazz:
455                                if g.IsVisible():
456                                    previewer.Draw(dc,
457                                        wxRect(posx+dx, posy,
458                                               iconwidth, iconheight),
459                                        g.GetProperties(), shapeType)
460                                    dc.DrawText(g.GetDisplayText(),
461                                                posx+2*dx+iconwidth, posy)
462                                    posy+=stepy
463    
464        def render_scalebar(self):
465            """Render the scalebar."""
466    
467            scalebar = ScaleBar(self.map)
468    
469            # Dimension stuff
470            width, height = self.dc.GetSizeTuple()
471            mminx, mminy, mmaxx, mmaxy = self.destination_region
472    
473            # Render the scalebar
474            scalebar.DrawScaleBar(self.scale, self.dc,
475                                 (mmaxx+10+5, mmaxy-25),
476                                 ((width-15-5) - (mmaxx+10+5),20)
477                                )
478            # 10 pix between map and legend frame, 5 pix inside legend frame
479            # 25 pix from the legend frame bottom line
480            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
481            # Height: 20
482    
483      # When printing we want to see all layers  class PrinterRenderer(ExportRenderer):
484      honor_visibility = 0  
485        # Printing as well as Export / Screen display only the visible layer.
486        honor_visibility = 1
487    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.6  
changed lines
  Added in v.2635
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