/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 76 by bh, Mon Feb 4 19:23:30 2002 UTC revision 2431 by joey, Sun Dec 5 15:05:02 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001-2004 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, 2004)
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    from Thuban import _
20    
21    from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
22        wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
23        wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
24        wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, \
25        wxBITMAP_TYPE_JPEG, wxBITMAP_TYPE_PNG, wxBITMAP_TYPE_TIF, wxBITMAP_TYPE_GIF
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    
 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  
41    
42    # Map the strings used for the format parameter of the draw_raster_data
43    # method to the appropriate wxWindows constants
44    raster_format_map = {
45        "BMP": wxBITMAP_TYPE_BMP,
46        "JPEG": wxBITMAP_TYPE_JPEG,
47        "PNG": wxBITMAP_TYPE_PNG,
48        "TIFF": wxBITMAP_TYPE_TIF,
49        "GIF": wxBITMAP_TYPE_GIF,
50        }
51    
52  class MapRenderer:  class MapRenderer(BaseRenderer):
53    
54      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
55    
56      honor_visibility = 1      TRANSPARENT_PEN = wxTRANSPARENT_PEN
57        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
58    
59      def __init__(self, dc, scale, offset, resolution = 72.0,      def make_point(self, x, y):
60                   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())  
61    
62      def draw_shape_layer(self, layer):      def tools_for_property(self, prop):
63          scale = self.scale          fill = prop.GetFill()
64          offx, offy = self.offset          if fill is Transparent:
65                brush = self.TRANSPARENT_BRUSH
66            else:
67                brush = wxBrush(Color2wxColour(fill), wxSOLID)
68    
69          fill = layer.fill          stroke = prop.GetLineColor()
70          if fill is None:          if stroke is Transparent:
71              brush = wxTRANSPARENT_BRUSH              pen = self.TRANSPARENT_PEN
72          else:          else:
73              color = wxColour(fill.red * 255,              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
74                               fill.green * 255,          return pen, brush
75                               fill.blue * 255)  
76              brush = wxBrush(color, wxSOLID)      def low_level_renderer(self, layer):
77          stroke = layer.stroke          """Override inherited method to provide more efficient renderers
78          stroke_width = layer.stroke_width  
79          if stroke is None:          If the underlying data format is not a shapefile or the layer
80              pen = wxTRANSPARENT_PEN          contains points shapes, simply use what the inherited method
81            returns.
82    
83            Otherwise, i.e. for arc and polygon use the more efficient
84            wxproj.draw_polygon_shape and its corresponding parameter
85            created with wxproj.draw_polygon_init.
86            """
87            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
88                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
89                offx, offy = self.offset
90                return (True, draw_polygon_shape,
91                        draw_polygon_init(layer.ShapeStore().Shapefile(),
92                                          self.dc, self.map.projection,
93                                          layer.projection,
94                                          self.scale, -self.scale, offx, offy))
95          else:          else:
96              color = wxColour(stroke.red * 255,              return BaseRenderer.low_level_renderer(self, layer)
                              stroke.green * 255,  
                              stroke.blue * 255)  
             pen = wxPen(color, stroke_width, wxSOLID)  
97    
98          map_proj = self.map.projection      def label_font(self):
99          layer_proj = layer.projection          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
100                          wxNORMAL)
101    
102        def draw_raster_data(self, data, format = 'BMP'):
103            stream = cStringIO.StringIO(data)
104            image = wxImageFromStream(stream, raster_format_map[format])
105            bitmap = wxBitmapFromImage(image)
106            self.dc.DrawBitmap(bitmap, 0, 0)
107    
108    
109    class ScreenRenderer(MapRenderer):
110    
111        # On the screen we want to see only visible layers by default
112        honor_visibility = 1
113    
114        def RenderMap(self, selected_layer, selected_shapes):
115            """Render the map.
116    
117            Only the given region (a tuple in window coordinates as returned
118            by a wxrect's asTuple method) needs to be redrawn. Highlight the
119            shapes given by the ids in selected_shapes in the
120            selected_layer.
121            """
122            self.selected_layer = selected_layer
123            self.selected_shapes = selected_shapes
124            self.render_map()
125    
126        def RenderMapIncrementally(self):
127            """Render the map.
128    
129            Only the given region (a tuple in window coordinates as returned
130            by a wxrect's asTuple method) needs to be redrawn. Highlight the
131            shapes given by the ids in selected_shapes in the
132            selected_layer.
133            """
134            return self.render_map_incrementally()
135    
136        def draw_selection_incrementally(self, layer, selected_shapes):
137            """Draw the selected shapes in a emphasized way (i.e.
138            with a special pen and brush.
139            The drawing is performed incrementally, that means every
140            n shapes, the user can have interactions with the map.
141            n is currently fixed to 500.
142    
143            layer -- the layer where the shapes belong to.
144            selected_shapes -- a list of the shape-ids representing the
145                               selected shapes for the given layer.
146            """
147            pen = wxPen(wxBLACK, 3, wxSOLID)
148            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
149    
150          shapetype = layer.ShapeType()          shapetype = layer.ShapeType()
151            useraw, func, param = self.low_level_renderer(layer)
152            args = (pen, brush)
153    
154          if shapetype == SHAPETYPE_POLYGON:          # for point shapes we need to find out the properties
155              for i in range(layer.NumShapes()):          # to determine the size. Based on table and field,
156                  self.draw_polygon_shape(layer, i, pen, brush)          # we can find out the properties for object - see below.
157          else:          if shapetype == SHAPETYPE_POINT:
158              self.dc.SetBrush(brush)              lc = layer.GetClassification()
159              self.dc.SetPen(pen)              field = layer.GetClassificationColumn()
160              if shapetype == SHAPETYPE_ARC:              table = layer.ShapeStore().Table()
161                  f = self.draw_arc_shape  
162              elif shapetype == SHAPETYPE_POINT:          count = 0
163                  f = self.draw_point_shape          for index in selected_shapes:
164              for i in range(layer.NumShapes()):              count += 1
165                  f(layer, i)              shape = layer.Shape(index)
166    
167      def draw_polygon_shape(self, layer, index, pen, brush):              # Get the size of the specific property for this
168          offx, offy = self.offset                      # point
169          draw_polygon_shape(layer.shapefile.cobject(), index,              if shapetype == SHAPETYPE_POINT:
170                             self.dc, pen, brush,                  value = table.ReadValue(shape.ShapeID(), field)
171                             self.map.projection, layer.projection,                  group = lc.FindGroup(value)
172                             self.scale, -self.scale, offx, offy)                  size = group.GetProperties().GetSize()
173                    args = (pen, brush, size)
174    
175                if useraw:
176                    data = shape.RawData()
177                else:
178                    data = shape.Points()
179                func(param, data, *args)
180                if count % 500 == 0:
181                    yield True
182    
183      def projected_points(self, layer, index):      def layer_shapes(self, layer):
184            """Return the shapeids covered by the region that has to be redrawn
185    
186            Call the layer's ShapesInRegion method to determine the ids so
187            that it can use the quadtree.
188            """
189            # FIXME: the quad-tree should be built from the projected
190            # coordinates not the lat-long ones because it's not trivial to
191            # determine an appropriate rectangle in lat-long for a given
192            # rectangle in projected coordinates which we have to start from
193            # here.
194          proj = self.map.projection          proj = self.map.projection
195          if proj is not None:          if proj is not None:
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
196              inverse = proj.Inverse              inverse = proj.Inverse
197          else:          else:
198              inverse = None              inverse = None
199          shape = layer.Shape(index)  
         points = []  
200          scale = self.scale          scale = self.scale
201          offx, offy = self.offset          offx, offy = self.offset
202          for x, y in shape.Points():          xs = []
203            ys = []
204            x, y, width, height = self.region
205            for winx, winy in ((x, y), (x + width, y),
206                               (x + width, y + height), (x, y + height)):
207                px = (winx - offx) / scale
208                py = -(winy - offy) / scale
209              if inverse:              if inverse:
210                  x, y = inverse(x, y)                  px, py = inverse(px, py)
211              if forward:              xs.append(px)
212                  x, y = forward(x, y)              ys.append(py)
213              points.append(wxPoint(x * scale + offx,          left = min(xs)
214                                    -y * scale + offy))          right = max(xs)
215          return points          top = max(ys)
216            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)  
217    
218      def draw_label_layer(self, layer):          return layer.ShapesInRegion((left, bottom, right, top))
         scale = self.scale  
         offx, offy = self.offset  
219    
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
220    
221          map_proj = self.map.projection  class ExportRenderer(ScreenRenderer):
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
222    
223          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)  
224    
225        def __init__(self, *args, **kw):
226            """Initialize the ExportRenderer.
227    
228  class ScreenRenderer(MapRenderer):          In addition to all parameters of the the ScreenRender
229            constructor, this class requires and additional keyword argument
230            destination_region with a tuple (minx, miny, maxx, maxy) giving
231            the region in dc coordinates which is to contain the map.
232            """
233            self.destination_region = kw["destination_region"]
234            del kw["destination_region"]
235            ScreenRenderer.__init__(self, *args, **kw)
236    
237        def RenderMap(self, selected_layer, selected_shapes):
238            """Render the map.
239    
240            The rendering device has been specified during initialisation.
241            The device border distance was set in
242            Thuban.UI.viewport.output_transform().
243    
244            RenderMap renders a frame set (one page frame, one around
245            legend/scalebar and one around the map), the map, the legend and
246            the scalebar on the given DC. The map is rendered with the
247            region displayed in the canvas view, centered on the area
248            available for map display.
249            """
250    
     # On the screen we want to see only visible layers by default  
     honor_visibility = 1  
       
     def RenderMap(self, map, selected_layer, selected_shape):  
251          self.selected_layer = selected_layer          self.selected_layer = selected_layer
252          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
         self.render_map(map)  
253    
254      def draw_shape_layer(self, layer):          # Get some dimensions
255          MapRenderer.draw_shape_layer(self, layer)          llx, lly, urx, ury = self.region
256          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)  
257    
258            # Manipulate the offset to position the map
259            offx, offy = self.offset
260            # 1. Shift to corner of map drawing area
261            offx = offx + mminx
262            offy = offy + mminy
263    
264            # 2. Center the map on the map drawing area:
265            # region identifies the region on the canvas view:
266            # center of map drawing area - half the size of region: rendering origin
267            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
268            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
269    
270            self.offset = (offx+self.shiftx, offy+self.shifty)
271    
272            # Draw the map
273            self.dc.BeginDrawing()
274            self.dc.DestroyClippingRegion()
275            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
276                                      urx, ury)
277            self.render_map()
278            self.dc.EndDrawing()
279    
280            # Draw the rest (frames, legend, scalebar)
281            self.dc.BeginDrawing()
282            self.dc.DestroyClippingRegion()
283    
284            # Force the font for Legend drawing
285            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
286            self.dc.SetFont(font)
287    
288            self.render_frame()
289            self.render_legend()
290            self.render_scalebar()
291            self.dc.EndDrawing()
292    
293        def render_frame(self):
294            """Render the frames for map and legend/scalebar."""
295    
296            dc = self.dc
297            dc.SetPen(wxBLACK_PEN)
298            dc.SetBrush(wxTRANSPARENT_BRUSH)
299    
300            # Dimension stuff
301            width, height = dc.GetSizeTuple()
302            mminx, mminy, mmaxx, mmaxy = self.destination_region
303    
304            # Page Frame
305            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
306    
307            # Map Frame
308            llx, lly, urx, ury = self.region
309            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
310    
311            # Legend Frame
312            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
313    
314            dc.DestroyClippingRegion()
315            dc.SetClippingRegion(mmaxx+10,mminy,
316                                 (width-20) - (mmaxx+10), mmaxy-mminy)
317    
318        def render_legend(self):
319            """Render the legend on the Map."""
320    
321            previewer = ClassDataPreviewer()
322            dc = self.dc
323            dc.SetPen(wxBLACK_PEN)
324            dc.SetBrush(wxTRANSPARENT_BRUSH)
325    
326            # Dimension stuff
327            width, height = dc.GetSizeTuple()
328            mminx, mminy, mmaxx, mmaxy = self.destination_region
329            textwidth, textheight = dc.GetTextExtent("0")
330            iconwidth  = textheight
331            iconheight = textheight
332            stepy = textheight+3
333            dx = 10
334            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
335                                    # 5 pix inside legend frame
336            posy = mminy + 5        # 5 pix inside legend frame
337    
338            # Render the legend
339            dc.SetTextForeground(wxBLACK)
340            if self.map.HasLayers():
341                layers = self.map.Layers()[:]
342                layers.reverse()
343                for l in layers:
344                    if l.Visible():
345                        # Render title
346                        dc.DrawText(l.Title(), posx, posy)
347                        posy+=stepy
348                        if l.HasClassification():
349                            # Render classification
350                            clazz = l.GetClassification()
351                            shapeType = l.ShapeType()
352                            for g in clazz:
353                                if g.IsVisible():
354                                    previewer.Draw(dc,
355                                        wxRect(posx+dx, posy,
356                                               iconwidth, iconheight),
357                                        g.GetProperties(), shapeType)
358                                    dc.DrawText(g.GetDisplayText(),
359                                                posx+2*dx+iconwidth, posy)
360                                    posy+=stepy
361    
362        def render_scalebar(self):
363            """Render the scalebar."""
364    
365            scalebar = ScaleBar(self.map)
366    
367            # Dimension stuff
368            width, height = self.dc.GetSizeTuple()
369            mminx, mminy, mmaxx, mmaxy = self.destination_region
370    
371            # Render the scalebar
372            scalebar.DrawScaleBar(self.scale, self.dc,
373                                 (mmaxx+10+5, mmaxy-25),
374                                 ((width-15-5) - (mmaxx+10+5),20)
375                                )
376            # 10 pix between map and legend frame, 5 pix inside legend frame
377            # 25 pix from the legend frame bottom line
378            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
379            # Height: 20
380    
381  class PrinterRender(MapRenderer):  class PrinterRenderer(ExportRenderer):
382    
383      # When printing we want to see all layers      # Printing as well as Export / Screen display only the visible layer.
384      honor_visibility = 0      honor_visibility = 1
385    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.76  
changed lines
  Added in v.2431
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