/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 1552 by bh, Wed Aug 6 17:21:32 2003 UTC revision 2700 by dpinte, Mon Sep 18 14:27:02 2006 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 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]>  # Jonathan Coles <[email protected]> (2003)
5  # Frank Koormann <[email protected]>  # 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  import cStringIO
18    
19    import array
20    
21    import traceback
22    
23  from Thuban import _  from Thuban import _
24    
25  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \  import wx
     wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  
     wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \  
     wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP  
26    
27  from wxproj import draw_polygon_shape, draw_polygon_init  from wxproj import draw_polygon_shape, draw_polygon_init
28    
# Line 24  from Thuban.UI.common import Color2wxCol Line 30  from Thuban.UI.common import Color2wxCol
30  from Thuban.UI.classifier import ClassDataPreviewer  from Thuban.UI.classifier import ClassDataPreviewer
31  from Thuban.UI.scalebar import ScaleBar  from Thuban.UI.scalebar import ScaleBar
32    
33  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
34         SHAPETYPE_POINT, RAW_SHAPEFILE
35    
36  from Thuban.Model.color import Transparent  from Thuban.Model.color import Transparent
37  import Thuban.Model.resource  import Thuban.Model.resource
38    
39  from baserenderer import BaseRenderer  from baserenderer import BaseRenderer
40    
41    from math import floor
42    
43    from types import StringType
44    
45    from Thuban.version import versions
46    
47    if Thuban.Model.resource.has_gdal_support():
48        from gdalwarp import ProjectRasterFile
49    
50    
51    # Map the strings used for the format parameter of the draw_raster_data
52    # method to the appropriate wxWindows constants
53    raster_format_map = {
54        "BMP": wx.BITMAP_TYPE_BMP,
55        "JPEG": wx.BITMAP_TYPE_JPEG,
56        "PNG": wx.BITMAP_TYPE_PNG,
57        "TIFF": wx.BITMAP_TYPE_TIF,
58        "GIF": wx.BITMAP_TYPE_GIF,
59        }
60    
61  class MapRenderer(BaseRenderer):  class MapRenderer(BaseRenderer):
62    
63      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
64    
65      TRANSPARENT_PEN = wxTRANSPARENT_PEN      TRANSPARENT_PEN = wx.TRANSPARENT_PEN
66      TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH      TRANSPARENT_BRUSH = wx.TRANSPARENT_BRUSH
67    
68      make_point = wxPoint      def make_point(self, x, y):
69            return wx.Point(int(round(x)), int(round(y)))
70    
71      def tools_for_property(self, prop):      def tools_for_property(self, prop):
72          fill = prop.GetFill()          fill = prop.GetFill()
73          if fill is Transparent:          if fill is Transparent:
74              brush = self.TRANSPARENT_BRUSH              brush = self.TRANSPARENT_BRUSH
75          else:          else:
76              brush = wxBrush(Color2wxColour(fill), wxSOLID)              brush = wx.Brush(Color2wxColour(fill), wx.SOLID)
77    
78          stroke = prop.GetLineColor()          stroke = prop.GetLineColor()
79          if stroke is Transparent:          if stroke is Transparent:
80              pen = self.TRANSPARENT_PEN              pen = self.TRANSPARENT_PEN
81          else:          else:
82              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)              pen = wx.Pen(Color2wxColour(stroke), prop.GetLineWidth(), wx.SOLID)
83          return pen, brush          return pen, brush
84    
85      def low_level_renderer(self, layer):      def low_level_renderer(self, layer):
86          """Override inherited method to provide more efficient renderers          """Override inherited method to provide more efficient renderers
87    
88          For point shapes, return self.draw_point_shape and layer just as          If the underlying data format is not a shapefile or the layer
89          the base class method. For arc and polygon use the more          contains points shapes, simply use what the inherited method
90          efficient wxproj.draw_polygon_shape and its corresponding          returns.
91          parameter created with wxproj.draw_polygon_init.  
92            Otherwise, i.e. for arc and polygon use the more efficient
93            wxproj.draw_polygon_shape and its corresponding parameter
94            created with wxproj.draw_polygon_init.
95          """          """
96          shapetype = layer.ShapeType()          if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
97          if shapetype == SHAPETYPE_POINT:              and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
             func = self.draw_point_shape  
             param = layer  
         else:  
98              offx, offy = self.offset              offx, offy = self.offset
99              param = draw_polygon_init(layer.ShapeStore().Shapefile(), self.dc,              x = lambda a, b, c, d: None
100                                        self.map.projection,              #return (True, x, None)
101                return (True, draw_polygon_shape,
102                        draw_polygon_init(layer.ShapeStore().Shapefile(),
103                                          self.dc, self.map.projection,
104                                        layer.projection,                                        layer.projection,
105                                        self.scale, -self.scale,                                        self.scale, -self.scale, offx, offy))
106                                        offx, offy)          else:
107              func = draw_polygon_shape              return BaseRenderer.low_level_renderer(self, layer)
         return func, param  
108    
109      def label_font(self):      def label_font(self):
110          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)          return wx.Font(int(round(self.resolution * 10)), wx.SWISS, wx.NORMAL,
111                          wx.NORMAL)
112    
113        def projected_raster_layer(self, layer, srcProj, dstProj, extents,
114                                   resolution, dimensions, options):
115            """Returns a raster layer image in projected space
116    
117            Based on a given filename.  This method must be implemented in
118            classes derived from BaseRenderer.
119            """
120    
121            ret = None
122    
123            if Thuban.Model.resource.has_gdal_support():
124    
125                if versions['wxPython-tuple'] < (2,5,3):
126                    options = options | 4  # INVERT_MASK_BITS
127                    options = options & ~2 # ALPHA_MASK not supported
128    
129                try:
130                    ret = ProjectRasterFile(layer.GetImageFilename(),
131                                            srcProj, dstProj,
132                                            extents, resolution, dimensions,
133                                            options)
134                except (MemoryError, IOError, AttributeError, ValueError):
135                    # Why does this catch AttributeError and ValueError?
136                    # FIXME: The exception should be communicated to the user
137                    # better.
138                    traceback.print_exc()
139    
140            return ret
141    
142        def draw_raster_data(self, x,y, data, format = 'BMP', opacity=1.0):
143    
144            mask = None
145            alpha = None
146            width = data[0]
147            height = data[1]
148            image_data, mask_data, alpha_data = data[2]
149    
150            if versions['wxPython-tuple'] < (2,5,3):
151                alpha_data = None
152    
153            if format == 'RAW':
154                image = wx.EmptyImage(width, height)
155                image.SetData(image_data)
156                if mask_data is not None:
157                    mask = wx.BitmapFromBits(mask_data, width, height, 1)
158                    mask = wx.Mask(mask)
159                elif alpha_data is not None:
160                    # alpha_data is already in the right format
161                    alpha = alpha_data
162    
163            else:
164                stream = cStringIO.StringIO(image_data)
165                image = wx.ImageFromStream(stream, raster_format_map[format])
166    
167      def draw_raster_data(self, data):              if mask_data is not None:
168          stream = cStringIO.StringIO(data)                  stream = cStringIO.StringIO(mask_data)
169          image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)                  mask = wx.ImageFromStream(stream, raster_format_map[format])
170          bitmap = wxBitmapFromImage(image)                  mask = wx.Mask(wx.BitmapFromImage(mask, 1))
171          self.dc.DrawBitmap(bitmap, 0, 0)              elif alpha_data is not None:
172                    stream = cStringIO.StringIO(alpha_data)
173                    alpha = wx.ImageFromStream(stream, raster_format_map[format])
174                    alpha = alpha.GetData() #[:] # XXX: do we need to copy this?
175                elif image.HasAlpha():
176                    alpha = image.GetAlphaData()
177    
178            #
179            # scale down the alpha values the opacity level using a string
180            # translation table for efficiency.
181            #
182            if alpha is not None:
183                if opacity == 0:
184                    return
185                elif opacity == 1:
186                    a = alpha
187                else:
188                    tr = [int(i*opacity) for i in range(256)]
189                    table = array.array('B', tr).tostring()
190                    a = alpha.translate(table)
191    
192                image.SetAlphaData(a)
193    
194            bitmap = wx.BitmapFromImage(image)
195    
196            if mask is not None:
197                bitmap.SetMask(mask)
198    
199            self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
200    
201    
202  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
# Line 91  class ScreenRenderer(MapRenderer): Line 204  class ScreenRenderer(MapRenderer):
204      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
205      honor_visibility = 1      honor_visibility = 1
206    
207      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, selected_layer, selected_shapes):
208          """Render the map.          """Render the map.
209    
210          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
# Line 99  class ScreenRenderer(MapRenderer): Line 212  class ScreenRenderer(MapRenderer):
212          shapes given by the ids in selected_shapes in the          shapes given by the ids in selected_shapes in the
213          selected_layer.          selected_layer.
214          """          """
         self.update_region = region  
215          self.selected_layer = selected_layer          self.selected_layer = selected_layer
216          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
217          self.render_map(map)          self.render_map()
218    
219        def RenderMapIncrementally(self):
220            """Render the map.
221    
222            Only the given region (a tuple in window coordinates as returned
223            by a wxrect's asTuple method) needs to be redrawn. Highlight the
224            shapes given by the ids in selected_shapes in the
225            selected_layer.
226            """
227            return self.render_map_incrementally()
228    
229        def draw_selection_incrementally(self, layer, selected_shapes):
230            """Draw the selected shapes in a emphasized way (i.e.
231            with a special pen and brush.
232            The drawing is performed incrementally, that means every
233            n shapes, the user can have interactions with the map.
234            n is currently fixed to 500.
235    
236            layer -- the layer where the shapes belong to.
237            selected_shapes -- a list of the shape-ids representing the
238                               selected shapes for the given layer.
239            """
240            pen = wx.Pen(wx.BLACK, 3, wx.SOLID)
241            brush = wx.Brush(wx.BLACK, wx.CROSS_HATCH)
242    
243            shapetype = layer.ShapeType()
244            useraw, func, param = self.low_level_renderer(layer)
245            args = (pen, brush)
246    
247      def draw_shape_layer(self, layer):          # for point shapes we need to find out the properties
248          MapRenderer.draw_shape_layer(self, layer)          # to determine the size. Based on table and field,
249          if layer is self.selected_layer and self.selected_shapes:          # we can find out the properties for object - see below.
250              pen = wxPen(wxBLACK, 3, wxSOLID)          if shapetype == SHAPETYPE_POINT:
251              brush = wxBrush(wxBLACK, wxCROSS_HATCH)              lc = layer.GetClassification()
252                field = layer.GetClassificationColumn()
253              shapetype = layer.ShapeType()              table = layer.ShapeStore().Table()
254              func, param = self.low_level_renderer(layer)  
255              args = (pen, brush)          count = 0
256              for index in self.selected_shapes:          for index in selected_shapes:
257                  func(param, index, *args)              count += 1
258                shape = layer.Shape(index)
259    
260                # Get the size of the specific property for this
261                # point
262                if shapetype == SHAPETYPE_POINT:
263                    if field is not None:
264                        value = table.ReadValue(shape.ShapeID(), field)
265                        group = lc.FindGroup(value)
266                        size = group.GetProperties().GetSize()
267                    else:
268                        size = lc.GetDefaultGroup().GetProperties().GetSize()
269                    args = (pen, brush, size)
270    
271                if useraw:
272                    data = shape.RawData()
273                else:
274                    data = shape.Points()
275                func(param, data, *args)
276                if count % 500 == 0:
277                    yield True
278    
279      def layer_ids(self, layer):      def layer_shapes(self, layer):
280          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
281    
282          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 137  class ScreenRenderer(MapRenderer): Line 297  class ScreenRenderer(MapRenderer):
297          offx, offy = self.offset          offx, offy = self.offset
298          xs = []          xs = []
299          ys = []          ys = []
300          x, y, width, height = self.update_region          x, y, width, height = self.region
301          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
302                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
303              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 158  class ExportRenderer(ScreenRenderer): Line 318  class ExportRenderer(ScreenRenderer):
318    
319      honor_visibility = 1      honor_visibility = 1
320    
321      def RenderMap(self, map, region, mapregion,      def __init__(self, *args, **kw):
322                    selected_layer, selected_shapes ):          """Initialize the ExportRenderer.
323    
324            In addition to all parameters of the the ScreenRender
325            constructor, this class requires and additional keyword argument
326            destination_region with a tuple (minx, miny, maxx, maxy) giving
327            the region in dc coordinates which is to contain the map.
328            """
329            self.destination_region = kw["destination_region"]
330            del kw["destination_region"]
331            ScreenRenderer.__init__(self, *args, **kw)
332    
333        def RenderMap(self, selected_layer, selected_shapes):
334          """Render the map.          """Render the map.
335    
336          The rendering device has been specified during initialisation.          The rendering device has been specified during initialisation.
337          The device border distance was set in Thuban.UI.view.OutputTranform().          The device border distance was set in
338            Thuban.UI.viewport.output_transform().
339    
340          RenderMap renders a frame set (one page frame, one around          RenderMap renders a frame set (one page frame, one around
341          legend/scalebar and one around the map), the map, the legend and the          legend/scalebar and one around the map), the map, the legend and
342          scalebar on the given DC. The map is rendered with the region displayed          the scalebar on the given DC. The map is rendered with the
343          in the canvas view, centered on the area available for map display.          region displayed in the canvas view, centered on the area
344            available for map display.
345          """          """
346    
         self.update_region = region  
347          self.selected_layer = selected_layer          self.selected_layer = selected_layer
348          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
349    
350          # Get some dimensions          # Get some dimensions
351          llx, lly, urx, ury = region          llx, lly, urx, ury = self.region
352          self.mapregion = mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
         mminx, mminy, mmaxx, mmaxy = self.mapregion  
353    
354          # Manipulate the offset to position the map          # Manipulate the offset to position the map
355          offx, offy = self.offset          offx, offy = self.offset
# Line 193  class ExportRenderer(ScreenRenderer): Line 364  class ExportRenderer(ScreenRenderer):
364          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
365    
366          self.offset = (offx+self.shiftx, offy+self.shifty)          self.offset = (offx+self.shiftx, offy+self.shifty)
367            self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)
368    
369          # Draw the map          # Draw the map
370          self.dc.BeginDrawing()          self.dc.BeginDrawing()
371          self.dc.DestroyClippingRegion()          self.dc.DestroyClippingRegion()
372          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
373                                    urx, ury)                                    urx, ury)
374          self.render_map(map)          self.render_map()
375          self.dc.EndDrawing()          self.dc.EndDrawing()
376    
377          # Draw the rest (frames, legend, scalebar)          # Draw the rest (frames, legend, scalebar)
# Line 207  class ExportRenderer(ScreenRenderer): Line 379  class ExportRenderer(ScreenRenderer):
379          self.dc.DestroyClippingRegion()          self.dc.DestroyClippingRegion()
380    
381          # Force the font for Legend drawing          # Force the font for Legend drawing
382          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)          font = wx.Font(self.resolution * 10, wx.SWISS, wx.NORMAL, wx.NORMAL)
383          self.dc.SetFont(font)          self.dc.SetFont(font)
384    
385          self.render_frame(region)          self.render_frame()
386          self.render_legend(map)          self.render_legend()
387          self.render_scalebar(map)          self.render_scalebar()
388          self.dc.EndDrawing()          self.dc.EndDrawing()
389    
390      def render_frame(self, region):      def render_frame(self):
391          """Render the frames for map and legend/scalebar."""          """Render the frames for map and legend/scalebar."""
392    
393          dc = self.dc          dc = self.dc
394          dc.SetPen(wxBLACK_PEN)          dc.SetPen(wx.BLACK_PEN)
395          dc.SetBrush(wxTRANSPARENT_BRUSH)          dc.SetBrush(wx.TRANSPARENT_BRUSH)
396    
397          # Dimension stuff          # Dimension stuff
398          width, height = dc.GetSizeTuple()          width, height = dc.GetSizeTuple()
399          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
400    
401          # Page Frame          # Page Frame
402          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
403    
404          # Map Frame          # Map Frame
405          llx, lly, urx, ury = region          llx, lly, urx, ury = self.region
406          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
407    
408          # Legend Frame          # Legend Frame
# Line 240  class ExportRenderer(ScreenRenderer): Line 412  class ExportRenderer(ScreenRenderer):
412          dc.SetClippingRegion(mmaxx+10,mminy,          dc.SetClippingRegion(mmaxx+10,mminy,
413                               (width-20) - (mmaxx+10), mmaxy-mminy)                               (width-20) - (mmaxx+10), mmaxy-mminy)
414    
415      def render_legend(self, map):      def render_legend(self):
416          """Render the legend on the Map."""          """Render the legend on the Map."""
417    
418          previewer = ClassDataPreviewer()          previewer = ClassDataPreviewer()
419          dc = self.dc          dc = self.dc
420          dc.SetPen(wxBLACK_PEN)          dc.SetPen(wx.BLACK_PEN)
421          dc.SetBrush(wxTRANSPARENT_BRUSH)          dc.SetBrush(wx.TRANSPARENT_BRUSH)
422    
423          # Dimension stuff          # Dimension stuff
424          width, height = dc.GetSizeTuple()          width, height = dc.GetSizeTuple()
425          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
426          textwidth, textheight = dc.GetTextExtent("0")          textwidth, textheight = dc.GetTextExtent("0")
427          iconwidth  = textheight          iconwidth  = textheight
428          iconheight = textheight          iconheight = textheight
# Line 261  class ExportRenderer(ScreenRenderer): Line 433  class ExportRenderer(ScreenRenderer):
433          posy = mminy + 5        # 5 pix inside legend frame          posy = mminy + 5        # 5 pix inside legend frame
434    
435          # Render the legend          # Render the legend
436          dc.SetTextForeground(wxBLACK)          dc.SetTextForeground(wx.BLACK)
437          if map.HasLayers():          if self.map.HasLayers():
438              layers = map.Layers()              layers = self.map.Layers()[:]
439              layers.reverse()              layers.reverse()
440              for l in layers:              for l in layers:
441                  if l.Visible():                  if l.Visible():
# Line 277  class ExportRenderer(ScreenRenderer): Line 449  class ExportRenderer(ScreenRenderer):
449                          for g in clazz:                          for g in clazz:
450                              if g.IsVisible():                              if g.IsVisible():
451                                  previewer.Draw(dc,                                  previewer.Draw(dc,
452                                      wxRect(posx+dx, posy,                                      wx.Rect(posx+dx, posy,
453                                             iconwidth, iconheight),                                             iconwidth, iconheight),
454                                      g.GetProperties(), shapeType)                                      g.GetProperties(), shapeType)
455                                  dc.DrawText(g.GetDisplayText(),                                  dc.DrawText(g.GetDisplayText(),
456                                              posx+2*dx+iconwidth, posy)                                              posx+2*dx+iconwidth, posy)
457                                  posy+=stepy                                  posy+=stepy
458    
459      def render_scalebar(self, map):      def render_scalebar(self):
460          """Render the scalebar."""          """Render the scalebar."""
461    
462          scalebar = ScaleBar(map)          scalebar = ScaleBar(self.map)
463    
464          # Dimension stuff          # Dimension stuff
465          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
466          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
467    
468          # Render the scalebar          # Render the scalebar
469          scalebar.DrawScaleBar(self.scale, self.dc,          scalebar.DrawScaleBar(self.scale, self.dc,
Legend:
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  Added in v.2700
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