/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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trunk/thuban/Thuban/UI/renderer.py revision 76 by bh, Mon Feb 4 19:23:30 2002 UTC branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py revision 2734 by bramz, Thu Mar 1 12:42:59 2007 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001-2006 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    import wx
26    
27    from wxproj import draw_polygon_shape, draw_polygon_init
28    
29    from Thuban.UI.common import Color2wxColour
30    from Thuban.UI.classifier import ClassDataPreviewer
31    from Thuban.UI.scalebar import ScaleBar
32    
33    from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
34         SHAPETYPE_POINT, RAW_SHAPEFILE
35    
36  from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \  from Thuban.Model.color import Transparent
37       wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  import Thuban.Model.resource
      wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  
38    
39  from wxproj import draw_polygon_shape  from baserenderer import BaseRenderer
40    
41  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from math import floor
      SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
42    
43    from types import StringType
44    
45  class MapRenderer:  from Thuban.version import versions
46    
47    if Thuban.Model.resource.has_gdal_support():
48        from gdalwarp import ProjectRasterFile
49    
50    verbose = 0 # whether to talk more on stdout
51    
52    # Map the strings used for the format parameter of the draw_raster_data
53    # method to the appropriate wxWindows constants
54    raster_format_map = {
55        "BMP": wx.BITMAP_TYPE_BMP,
56        "JPEG": wx.BITMAP_TYPE_JPEG,
57        "PNG": wx.BITMAP_TYPE_PNG,
58        "TIFF": wx.BITMAP_TYPE_TIF,
59        "GIF": wx.BITMAP_TYPE_GIF,
60        }
61    
62    class MapRenderer(BaseRenderer):
63    
64      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
65    
66      honor_visibility = 1      TRANSPARENT_PEN = wx.TRANSPARENT_PEN
67        TRANSPARENT_BRUSH = wx.TRANSPARENT_BRUSH
68    
69      def __init__(self, dc, scale, offset, resolution = 72.0,      def make_point(self, x, y):
70                   honor_visibility = None):          return wx.Point(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())  
71    
72      def draw_shape_layer(self, layer):      def tools_for_property(self, prop):
73          scale = self.scale          fill = prop.GetFill()
74          offx, offy = self.offset          if fill is Transparent:
75                brush = self.TRANSPARENT_BRUSH
76            else:
77                brush = wx.Brush(Color2wxColour(fill), wx.SOLID)
78    
79          fill = layer.fill          stroke = prop.GetLineColor()
80          if fill is None:          if stroke is Transparent:
81              brush = wxTRANSPARENT_BRUSH              pen = self.TRANSPARENT_PEN
82          else:          else:
83              color = wxColour(fill.red * 255,              pen = wx.Pen(Color2wxColour(stroke), prop.GetLineWidth(), wx.SOLID)
84                               fill.green * 255,          return pen, brush
85                               fill.blue * 255)  
86              brush = wxBrush(color, wxSOLID)      def low_level_renderer(self, layer):
87          stroke = layer.stroke          """Override inherited method to provide more efficient renderers
88          stroke_width = layer.stroke_width  
89          if stroke is None:          If the underlying data format is not a shapefile or the layer
90              pen = wxTRANSPARENT_PEN          contains points shapes, simply use what the inherited method
91            returns.
92    
93            Otherwise, i.e. for arc and polygon use the more efficient
94            wxproj.draw_polygon_shape and its corresponding parameter
95            created with wxproj.draw_polygon_init.
96            """
97            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
98                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
99                offx, offy = self.offset
100                x = lambda a, b, c, d: None
101                #return (True, x, None)
102                return (True, draw_polygon_shape,
103                        draw_polygon_init(layer.ShapeStore().Shapefile(),
104                                          self.dc, self.map.projection,
105                                          layer.projection,
106                                          self.scale, -self.scale, offx, offy))
107          else:          else:
108              color = wxColour(stroke.red * 255,              return BaseRenderer.low_level_renderer(self, layer)
                              stroke.green * 255,  
                              stroke.blue * 255)  
             pen = wxPen(color, stroke_width, wxSOLID)  
109    
110          map_proj = self.map.projection      def label_font(self):
111          layer_proj = layer.projection          return wx.Font(int(round(self.resolution * 10)), wx.SWISS, wx.NORMAL,
112                          wx.NORMAL)
113    
114        def projected_raster_layer(self, layer, srcProj, dstProj, extents,
115                                   resolution, dimensions, options):
116            """Returns a raster layer image in projected space
117    
118          shapetype = layer.ShapeType()          Based on a given filename.  This method must be implemented in
119            classes derived from BaseRenderer.
120            """
121    
122            ret = None
123    
124            if Thuban.Model.resource.has_gdal_support():
125    
126                if versions['wxPython-tuple'] < (2,5,3):
127                    options = options | 4  # INVERT_MASK_BITS
128                    options = options & ~2 # ALPHA_MASK not supported
129    
130                try:
131                    if verbose > 0:
132                        print "doing ProjectRasterFile '%s' -> '%s'" % \
133                                    (srcProj, dstProj)
134                        print "extents:", extents, "resolution:", resolution
135                        print "dimensions:", dimensions, "options:", options
136                    ret = ProjectRasterFile(layer.GetImageFilename(),
137                                            srcProj, dstProj,
138                                            extents, resolution, dimensions,
139                                            options)
140                except (MemoryError, IOError, AttributeError, ValueError):
141                    # Why does this catch AttributeError and ValueError?
142                    # FIXME: The exception should be communicated to the user
143                    # better.
144                    traceback.print_exc()
145    
146            return ret
147    
148        def draw_raster_data(self, x,y, data, format = 'BMP', opacity=1.0):
149    
150            mask = None
151            alpha = None
152            width = data[0]
153            height = data[1]
154            image_data, mask_data, alpha_data = data[2]
155    
156            if versions['wxPython-tuple'] < (2,5,3):
157                alpha_data = None
158    
159            if format == 'RAW':
160                image = wx.EmptyImage(width, height)
161                image.SetData(image_data)
162                if mask_data is not None:
163                    mask = wx.BitmapFromBits(mask_data, width, height, 1)
164                    mask = wx.Mask(mask)
165                elif alpha_data is not None:
166                    # alpha_data is already in the right format
167                    alpha = alpha_data
168    
         if shapetype == SHAPETYPE_POLYGON:  
             for i in range(layer.NumShapes()):  
                 self.draw_polygon_shape(layer, i, pen, brush)  
169          else:          else:
170              self.dc.SetBrush(brush)              stream = cStringIO.StringIO(image_data)
171              self.dc.SetPen(pen)              image = wx.ImageFromStream(stream, raster_format_map[format])
172              if shapetype == SHAPETYPE_ARC:  
173                  f = self.draw_arc_shape              if mask_data is not None:
174              elif shapetype == SHAPETYPE_POINT:                  stream = cStringIO.StringIO(mask_data)
175                  f = self.draw_point_shape                  mask = wx.ImageFromStream(stream, raster_format_map[format])
176              for i in range(layer.NumShapes()):                  mask = wx.Mask(wx.BitmapFromImage(mask, 1))
177                  f(layer, i)              elif alpha_data is not None:
178                    stream = cStringIO.StringIO(alpha_data)
179      def draw_polygon_shape(self, layer, index, pen, brush):                  alpha = wx.ImageFromStream(stream, raster_format_map[format])
180          offx, offy = self.offset                          alpha = alpha.GetData() #[:] # XXX: do we need to copy this?
181          draw_polygon_shape(layer.shapefile.cobject(), index,              elif image.HasAlpha():
182                             self.dc, pen, brush,                  alpha = image.GetAlphaData()
183                             self.map.projection, layer.projection,  
184                             self.scale, -self.scale, offx, offy)          #
185            # scale down the alpha values the opacity level using a string
186            # translation table for efficiency.
187            #
188            if alpha is not None:
189                if opacity == 0:
190                    return
191                elif opacity == 1:
192                    a = alpha
193                else:
194                    tr = [int(i*opacity) for i in range(256)]
195                    table = array.array('B', tr).tostring()
196                    a = alpha.translate(table)
197    
198                image.SetAlphaData(a)
199    
200            bitmap = wx.BitmapFromImage(image)
201    
202            if mask is not None:
203                bitmap.SetMask(mask)
204    
205            self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
206    
207    
208    class ScreenRenderer(MapRenderer):
209    
210        # On the screen we want to see only visible layers by default
211        honor_visibility = 1
212    
213        def RenderMap(self, selected_layer, selected_shapes):
214            """Render the map.
215    
216            Only the given region (a tuple in window coordinates as returned
217            by a wxrect's asTuple method) needs to be redrawn. Highlight the
218            shapes given by the ids in selected_shapes in the
219            selected_layer.
220            """
221            self.selected_layer = selected_layer
222            self.selected_shapes = selected_shapes
223            self.render_map()
224    
225        def RenderMapIncrementally(self):
226            """Render the map.
227    
228            Only the given region (a tuple in window coordinates as returned
229            by a wxrect's asTuple method) needs to be redrawn. Highlight the
230            shapes given by the ids in selected_shapes in the
231            selected_layer.
232            """
233            return self.render_map_incrementally()
234    
235        def draw_selection_incrementally(self, layer, selected_shapes):
236            """Draw the selected shapes in a emphasized way (i.e.
237            with a special pen and brush.
238            The drawing is performed incrementally, that means every
239            n shapes, the user can have interactions with the map.
240            n is currently fixed to 500.
241    
242            layer -- the layer where the shapes belong to.
243            selected_shapes -- a list of the shape-ids representing the
244                               selected shapes for the given layer.
245            """
246            pen = wx.Pen(wx.BLACK, 3, wx.SOLID)
247            brush = wx.Brush(wx.BLACK, wx.CROSS_HATCH)
248    
249            shapetype = layer.ShapeType()
250            useraw, func, param = self.low_level_renderer(layer)
251            args = (pen, brush)
252    
253      def projected_points(self, layer, index):          # for point shapes we need to find out the properties
254            # to determine the size. Based on table and field,
255            # we can find out the properties for object - see below.
256            if shapetype == SHAPETYPE_POINT:
257                lc = layer.GetClassification()
258                field = layer.GetClassificationColumn()
259                table = layer.ShapeStore().Table()
260    
261            count = 0
262            for index in selected_shapes:
263                count += 1
264                shape = layer.Shape(index)
265    
266                # Get the size of the specific property for this
267                # point
268                if shapetype == SHAPETYPE_POINT:
269                    if field is not None:
270                        value = table.ReadValue(shape.ShapeID(), field)
271                        group = lc.FindGroup(value)
272                        size = group.GetProperties().GetSize()
273                    else:
274                        size = lc.GetDefaultGroup().GetProperties().GetSize()
275                    args = (pen, brush, size)
276    
277                if useraw:
278                    data = shape.RawData()
279                else:
280                    data = shape.Points()
281                func(param, data, *args)
282                if count % 500 == 0:
283                    yield True
284    
285        def layer_shapes(self, layer):
286            """Return the shapeids covered by the region that has to be redrawn
287    
288            Call the layer's ShapesInRegion method to determine the ids so
289            that it can use the quadtree.
290            """
291            # FIXME: the quad-tree should be built from the projected
292            # coordinates not the lat-long ones because it's not trivial to
293            # determine an appropriate rectangle in lat-long for a given
294            # rectangle in projected coordinates which we have to start from
295            # here.
296          proj = self.map.projection          proj = self.map.projection
297          if proj is not None:          if proj is not None:
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
298              inverse = proj.Inverse              inverse = proj.Inverse
299          else:          else:
300              inverse = None              inverse = None
301          shape = layer.Shape(index)  
         points = []  
302          scale = self.scale          scale = self.scale
303          offx, offy = self.offset          offx, offy = self.offset
304          for x, y in shape.Points():          xs = []
305            ys = []
306            x, y, width, height = self.region
307            for winx, winy in ((x, y), (x + width, y),
308                               (x + width, y + height), (x, y + height)):
309                px = (winx - offx) / scale
310                py = -(winy - offy) / scale
311              if inverse:              if inverse:
312                  x, y = inverse(x, y)                  px, py = inverse(px, py)
313              if forward:              xs.append(px)
314                  x, y = forward(x, y)              ys.append(py)
315              points.append(wxPoint(x * scale + offx,          left = min(xs)
316                                    -y * scale + offy))          right = max(xs)
317          return points          top = max(ys)
318            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)  
319    
320      def draw_label_layer(self, layer):          return layer.ShapesInRegion((left, bottom, right, top))
         scale = self.scale  
         offx, offy = self.offset  
321    
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
322    
323          map_proj = self.map.projection  class ExportRenderer(ScreenRenderer):
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
324    
325          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)  
326    
327        def __init__(self, *args, **kw):
328            """Initialize the ExportRenderer.
329    
330  class ScreenRenderer(MapRenderer):          In addition to all parameters of the the ScreenRender
331            constructor, this class requires and additional keyword argument
332            destination_region with a tuple (minx, miny, maxx, maxy) giving
333            the region in dc coordinates which is to contain the map.
334            """
335            self.destination_region = kw["destination_region"]
336            del kw["destination_region"]
337            ScreenRenderer.__init__(self, *args, **kw)
338    
339        def RenderMap(self, selected_layer, selected_shapes):
340            """Render the map.
341    
342            The rendering device has been specified during initialisation.
343            The device border distance was set in
344            Thuban.UI.viewport.output_transform().
345    
346            RenderMap renders a frame set (one page frame, one around
347            legend/scalebar and one around the map), the map, the legend and
348            the scalebar on the given DC. The map is rendered with the
349            region displayed in the canvas view, centered on the area
350            available for map display.
351            """
352    
     # On the screen we want to see only visible layers by default  
     honor_visibility = 1  
       
     def RenderMap(self, map, selected_layer, selected_shape):  
353          self.selected_layer = selected_layer          self.selected_layer = selected_layer
354          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
         self.render_map(map)  
355    
356      def draw_shape_layer(self, layer):          # Get some dimensions
357          MapRenderer.draw_shape_layer(self, layer)          llx, lly, urx, ury = self.region
358          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)  
359    
360            # Manipulate the offset to position the map
361            offx, offy = self.offset
362            # 1. Shift to corner of map drawing area
363            offx = offx + mminx
364            offy = offy + mminy
365    
366            # 2. Center the map on the map drawing area:
367            # region identifies the region on the canvas view:
368            # center of map drawing area - half the size of region: rendering origin
369            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
370            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
371    
372            self.offset = (offx+self.shiftx, offy+self.shifty)
373            self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)
374    
375            # Draw the map
376            self.dc.BeginDrawing()
377            self.dc.DestroyClippingRegion()
378            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
379                                      urx, ury)
380            self.render_map()
381            self.dc.EndDrawing()
382    
383            # Draw the rest (frames, legend, scalebar)
384            self.dc.BeginDrawing()
385            self.dc.DestroyClippingRegion()
386    
387  class PrinterRender(MapRenderer):          # Force the font for Legend drawing
388            font = wx.Font(self.resolution * 10, wx.SWISS, wx.NORMAL, wx.NORMAL)
389            self.dc.SetFont(font)
390    
391            self.render_frame()
392            self.render_legend()
393            self.render_scalebar()
394            self.dc.EndDrawing()
395    
396        def render_frame(self):
397            """Render the frames for map and legend/scalebar."""
398    
399            dc = self.dc
400            dc.SetPen(wx.BLACK_PEN)
401            dc.SetBrush(wx.TRANSPARENT_BRUSH)
402    
403            # Dimension stuff
404            width, height = dc.GetSizeTuple()
405            mminx, mminy, mmaxx, mmaxy = self.destination_region
406    
407            # Page Frame
408            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
409    
410            # Map Frame
411            llx, lly, urx, ury = self.region
412            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
413    
414            # Legend Frame
415            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
416    
417            dc.DestroyClippingRegion()
418            dc.SetClippingRegion(mmaxx+10,mminy,
419                                 (width-20) - (mmaxx+10), mmaxy-mminy)
420    
421        def render_legend(self):
422            """Render the legend on the Map."""
423    
424            previewer = ClassDataPreviewer()
425            dc = self.dc
426            dc.SetPen(wx.BLACK_PEN)
427            dc.SetBrush(wx.TRANSPARENT_BRUSH)
428    
429            # Dimension stuff
430            width, height = dc.GetSizeTuple()
431            mminx, mminy, mmaxx, mmaxy = self.destination_region
432            textwidth, textheight = dc.GetTextExtent("0")
433            iconwidth  = textheight
434            iconheight = textheight
435            stepy = textheight+3
436            dx = 10
437            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
438                                    # 5 pix inside legend frame
439            posy = mminy + 5        # 5 pix inside legend frame
440    
441            # Render the legend
442            dc.SetTextForeground(wx.BLACK)
443            if self.map.HasLayers():
444                layers = self.map.Layers()[:]
445                layers.reverse()
446                for l in layers:
447                    if l.Visible():
448                        # Render title
449                        dc.DrawText(l.Title(), posx, posy)
450                        posy+=stepy
451                        if l.HasClassification():
452                            # Render classification
453                            clazz = l.GetClassification()
454                            shapeType = l.ShapeType()
455                            for g in clazz:
456                                if g.IsVisible():
457                                    previewer.Draw(dc,
458                                        wx.Rect(posx+dx, posy,
459                                               iconwidth, iconheight),
460                                        g.GetProperties(), shapeType)
461                                    dc.DrawText(g.GetDisplayText(),
462                                                posx+2*dx+iconwidth, posy)
463                                    posy+=stepy
464    
465        def render_scalebar(self):
466            """Render the scalebar."""
467    
468            scalebar = ScaleBar(self.map)
469    
470            # Dimension stuff
471            width, height = self.dc.GetSizeTuple()
472            mminx, mminy, mmaxx, mmaxy = self.destination_region
473    
474            # Render the scalebar
475            scalebar.DrawScaleBar(self.scale, self.dc,
476                                 (mmaxx+10+5, mmaxy-25),
477                                 ((width-15-5) - (mmaxx+10+5),20)
478                                )
479            # 10 pix between map and legend frame, 5 pix inside legend frame
480            # 25 pix from the legend frame bottom line
481            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
482            # Height: 20
483    
484      # When printing we want to see all layers  class PrinterRenderer(ExportRenderer):
485      honor_visibility = 0  
486        # Printing as well as Export / Screen display only the visible layer.
487        honor_visibility = 1
488    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.76  
changed lines
  Added in v.2734
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