/[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 2394 by jan, Wed Nov 17 22:02:29 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, wxBITMAP_TYPE_JPEG
25    
26    from wxproj import draw_polygon_shape, draw_polygon_init
27    
28    from Thuban.UI.common import Color2wxColour
29    from Thuban.UI.classifier import ClassDataPreviewer
30    from Thuban.UI.scalebar import ScaleBar
31    
32    from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
33         SHAPETYPE_POINT, RAW_SHAPEFILE
34    
35  from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \  from Thuban.Model.color import Transparent
36       wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  import Thuban.Model.resource
      wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  
37    
38  from wxproj import draw_polygon_shape  from baserenderer import BaseRenderer
39    
 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  
40    
41    # Map the strings used for the format parameter of the draw_raster_data
42    # method to the appropriate wxWindows constants
43    raster_format_map = {
44        "BMP": wxBITMAP_TYPE_BMP,
45        "JPEG": wxBITMAP_TYPE_JPEG,
46        }
47    
48  class MapRenderer:  class MapRenderer(BaseRenderer):
49    
50      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
51    
52      honor_visibility = 1      TRANSPARENT_PEN = wxTRANSPARENT_PEN
53        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
54    
55      def __init__(self, dc, scale, offset, resolution = 72.0,      def make_point(self, x, y):
56                   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())  
57    
58      def draw_shape_layer(self, layer):      def tools_for_property(self, prop):
59          scale = self.scale          fill = prop.GetFill()
60          offx, offy = self.offset          if fill is Transparent:
61                brush = self.TRANSPARENT_BRUSH
62            else:
63                brush = wxBrush(Color2wxColour(fill), wxSOLID)
64    
65          fill = layer.fill          stroke = prop.GetLineColor()
66          if fill is None:          if stroke is Transparent:
67              brush = wxTRANSPARENT_BRUSH              pen = self.TRANSPARENT_PEN
68          else:          else:
69              color = wxColour(fill.red * 255,              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
70                               fill.green * 255,          return pen, brush
71                               fill.blue * 255)  
72              brush = wxBrush(color, wxSOLID)      def low_level_renderer(self, layer):
73          stroke = layer.stroke          """Override inherited method to provide more efficient renderers
74          stroke_width = layer.stroke_width  
75          if stroke is None:          If the underlying data format is not a shapefile or the layer
76              pen = wxTRANSPARENT_PEN          contains points shapes, simply use what the inherited method
77            returns.
78    
79            Otherwise, i.e. for arc and polygon use the more efficient
80            wxproj.draw_polygon_shape and its corresponding parameter
81            created with wxproj.draw_polygon_init.
82            """
83            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
84                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
85                offx, offy = self.offset
86                return (True, draw_polygon_shape,
87                        draw_polygon_init(layer.ShapeStore().Shapefile(),
88                                          self.dc, self.map.projection,
89                                          layer.projection,
90                                          self.scale, -self.scale, offx, offy))
91          else:          else:
92              color = wxColour(stroke.red * 255,              return BaseRenderer.low_level_renderer(self, layer)
                              stroke.green * 255,  
                              stroke.blue * 255)  
             pen = wxPen(color, stroke_width, wxSOLID)  
93    
94          map_proj = self.map.projection      def label_font(self):
95          layer_proj = layer.projection          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
96                          wxNORMAL)
97    
98        def draw_raster_data(self, data, format = 'BMP'):
99            stream = cStringIO.StringIO(data)
100            image = wxImageFromStream(stream, raster_format_map[format])
101            bitmap = wxBitmapFromImage(image)
102            self.dc.DrawBitmap(bitmap, 0, 0)
103    
104    
105    class ScreenRenderer(MapRenderer):
106    
107        # On the screen we want to see only visible layers by default
108        honor_visibility = 1
109    
110        def RenderMap(self, selected_layer, selected_shapes):
111            """Render the map.
112    
113            Only the given region (a tuple in window coordinates as returned
114            by a wxrect's asTuple method) needs to be redrawn. Highlight the
115            shapes given by the ids in selected_shapes in the
116            selected_layer.
117            """
118            self.selected_layer = selected_layer
119            self.selected_shapes = selected_shapes
120            self.render_map()
121    
122        def RenderMapIncrementally(self):
123            """Render the map.
124    
125            Only the given region (a tuple in window coordinates as returned
126            by a wxrect's asTuple method) needs to be redrawn. Highlight the
127            shapes given by the ids in selected_shapes in the
128            selected_layer.
129            """
130            return self.render_map_incrementally()
131    
132        def draw_selection_incrementally(self, layer, selected_shapes):
133            """Draw the selected shapes in a emphasized way (i.e.
134            with a special pen and brush.
135            The drawing is performed incrementally, that means every
136            n shapes, the user can have interactions with the map.
137            n is currently fixed to 500.
138    
139            layer -- the layer where the shapes belong to.
140            selected_shapes -- a list of the shape-ids representing the
141                               selected shapes for the given layer.
142            """
143            pen = wxPen(wxBLACK, 3, wxSOLID)
144            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
145    
146          shapetype = layer.ShapeType()          shapetype = layer.ShapeType()
147            useraw, func, param = self.low_level_renderer(layer)
148            args = (pen, brush)
149    
150          if shapetype == SHAPETYPE_POLYGON:          # for point shapes we need to find out the properties
151              for i in range(layer.NumShapes()):          # to determine the size. Based on table and field,
152                  self.draw_polygon_shape(layer, i, pen, brush)          # we can find out the properties for object - see below.
153          else:          if shapetype == SHAPETYPE_POINT:
154              self.dc.SetBrush(brush)              lc = layer.GetClassification()
155              self.dc.SetPen(pen)              field = layer.GetClassificationColumn()
156              if shapetype == SHAPETYPE_ARC:              table = layer.ShapeStore().Table()
157                  f = self.draw_arc_shape  
158              elif shapetype == SHAPETYPE_POINT:          count = 0
159                  f = self.draw_point_shape          for index in selected_shapes:
160              for i in range(layer.NumShapes()):              count += 1
161                  f(layer, i)              shape = layer.Shape(index)
162    
163      def draw_polygon_shape(self, layer, index, pen, brush):              # Get the size of the specific property for this
164          offx, offy = self.offset                      # point
165          draw_polygon_shape(layer.shapefile.cobject(), index,              if shapetype == SHAPETYPE_POINT:
166                             self.dc, pen, brush,                  value = table.ReadValue(shape.ShapeID(), field)
167                             self.map.projection, layer.projection,                  group = lc.FindGroup(value)
168                             self.scale, -self.scale, offx, offy)                  size = group.GetProperties().GetSize()
169                    args = (pen, brush, size)
170    
171                if useraw:
172                    data = shape.RawData()
173                else:
174                    data = shape.Points()
175                func(param, data, *args)
176                if count % 500 == 0:
177                    yield True
178    
179      def projected_points(self, layer, index):      def layer_shapes(self, layer):
180            """Return the shapeids covered by the region that has to be redrawn
181    
182            Call the layer's ShapesInRegion method to determine the ids so
183            that it can use the quadtree.
184            """
185            # FIXME: the quad-tree should be built from the projected
186            # coordinates not the lat-long ones because it's not trivial to
187            # determine an appropriate rectangle in lat-long for a given
188            # rectangle in projected coordinates which we have to start from
189            # here.
190          proj = self.map.projection          proj = self.map.projection
191          if proj is not None:          if proj is not None:
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
192              inverse = proj.Inverse              inverse = proj.Inverse
193          else:          else:
194              inverse = None              inverse = None
195          shape = layer.Shape(index)  
         points = []  
196          scale = self.scale          scale = self.scale
197          offx, offy = self.offset          offx, offy = self.offset
198          for x, y in shape.Points():          xs = []
199            ys = []
200            x, y, width, height = self.region
201            for winx, winy in ((x, y), (x + width, y),
202                               (x + width, y + height), (x, y + height)):
203                px = (winx - offx) / scale
204                py = -(winy - offy) / scale
205              if inverse:              if inverse:
206                  x, y = inverse(x, y)                  px, py = inverse(px, py)
207              if forward:              xs.append(px)
208                  x, y = forward(x, y)              ys.append(py)
209              points.append(wxPoint(x * scale + offx,          left = min(xs)
210                                    -y * scale + offy))          right = max(xs)
211          return points          top = max(ys)
212            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)  
213    
214      def draw_label_layer(self, layer):          return layer.ShapesInRegion((left, bottom, right, top))
         scale = self.scale  
         offx, offy = self.offset  
215    
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
216    
217          map_proj = self.map.projection  class ExportRenderer(ScreenRenderer):
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
218    
219          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)  
220    
221        def __init__(self, *args, **kw):
222            """Initialize the ExportRenderer.
223    
224  class ScreenRenderer(MapRenderer):          In addition to all parameters of the the ScreenRender
225            constructor, this class requires and additional keyword argument
226            destination_region with a tuple (minx, miny, maxx, maxy) giving
227            the region in dc coordinates which is to contain the map.
228            """
229            self.destination_region = kw["destination_region"]
230            del kw["destination_region"]
231            ScreenRenderer.__init__(self, *args, **kw)
232    
233        def RenderMap(self, selected_layer, selected_shapes):
234            """Render the map.
235    
236            The rendering device has been specified during initialisation.
237            The device border distance was set in
238            Thuban.UI.viewport.output_transform().
239    
240            RenderMap renders a frame set (one page frame, one around
241            legend/scalebar and one around the map), the map, the legend and
242            the scalebar on the given DC. The map is rendered with the
243            region displayed in the canvas view, centered on the area
244            available for map display.
245            """
246    
     # On the screen we want to see only visible layers by default  
     honor_visibility = 1  
       
     def RenderMap(self, map, selected_layer, selected_shape):  
247          self.selected_layer = selected_layer          self.selected_layer = selected_layer
248          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
         self.render_map(map)  
249    
250      def draw_shape_layer(self, layer):          # Get some dimensions
251          MapRenderer.draw_shape_layer(self, layer)          llx, lly, urx, ury = self.region
252          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)  
253    
254            # Manipulate the offset to position the map
255            offx, offy = self.offset
256            # 1. Shift to corner of map drawing area
257            offx = offx + mminx
258            offy = offy + mminy
259    
260            # 2. Center the map on the map drawing area:
261            # region identifies the region on the canvas view:
262            # center of map drawing area - half the size of region: rendering origin
263            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
264            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
265    
266            self.offset = (offx+self.shiftx, offy+self.shifty)
267    
268            # Draw the map
269            self.dc.BeginDrawing()
270            self.dc.DestroyClippingRegion()
271            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
272                                      urx, ury)
273            self.render_map()
274            self.dc.EndDrawing()
275    
276            # Draw the rest (frames, legend, scalebar)
277            self.dc.BeginDrawing()
278            self.dc.DestroyClippingRegion()
279    
280            # Force the font for Legend drawing
281            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
282            self.dc.SetFont(font)
283    
284            self.render_frame()
285            self.render_legend()
286            self.render_scalebar()
287            self.dc.EndDrawing()
288    
289        def render_frame(self):
290            """Render the frames for map and legend/scalebar."""
291    
292            dc = self.dc
293            dc.SetPen(wxBLACK_PEN)
294            dc.SetBrush(wxTRANSPARENT_BRUSH)
295    
296            # Dimension stuff
297            width, height = dc.GetSizeTuple()
298            mminx, mminy, mmaxx, mmaxy = self.destination_region
299    
300            # Page Frame
301            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
302    
303            # Map Frame
304            llx, lly, urx, ury = self.region
305            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
306    
307            # Legend Frame
308            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
309    
310            dc.DestroyClippingRegion()
311            dc.SetClippingRegion(mmaxx+10,mminy,
312                                 (width-20) - (mmaxx+10), mmaxy-mminy)
313    
314        def render_legend(self):
315            """Render the legend on the Map."""
316    
317            previewer = ClassDataPreviewer()
318            dc = self.dc
319            dc.SetPen(wxBLACK_PEN)
320            dc.SetBrush(wxTRANSPARENT_BRUSH)
321    
322            # Dimension stuff
323            width, height = dc.GetSizeTuple()
324            mminx, mminy, mmaxx, mmaxy = self.destination_region
325            textwidth, textheight = dc.GetTextExtent("0")
326            iconwidth  = textheight
327            iconheight = textheight
328            stepy = textheight+3
329            dx = 10
330            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
331                                    # 5 pix inside legend frame
332            posy = mminy + 5        # 5 pix inside legend frame
333    
334            # Render the legend
335            dc.SetTextForeground(wxBLACK)
336            if self.map.HasLayers():
337                layers = self.map.Layers()[:]
338                layers.reverse()
339                for l in layers:
340                    if l.Visible():
341                        # Render title
342                        dc.DrawText(l.Title(), posx, posy)
343                        posy+=stepy
344                        if l.HasClassification():
345                            # Render classification
346                            clazz = l.GetClassification()
347                            shapeType = l.ShapeType()
348                            for g in clazz:
349                                if g.IsVisible():
350                                    previewer.Draw(dc,
351                                        wxRect(posx+dx, posy,
352                                               iconwidth, iconheight),
353                                        g.GetProperties(), shapeType)
354                                    dc.DrawText(g.GetDisplayText(),
355                                                posx+2*dx+iconwidth, posy)
356                                    posy+=stepy
357    
358        def render_scalebar(self):
359            """Render the scalebar."""
360    
361            scalebar = ScaleBar(self.map)
362    
363            # Dimension stuff
364            width, height = self.dc.GetSizeTuple()
365            mminx, mminy, mmaxx, mmaxy = self.destination_region
366    
367            # Render the scalebar
368            scalebar.DrawScaleBar(self.scale, self.dc,
369                                 (mmaxx+10+5, mmaxy-25),
370                                 ((width-15-5) - (mmaxx+10+5),20)
371                                )
372            # 10 pix between map and legend frame, 5 pix inside legend frame
373            # 25 pix from the legend frame bottom line
374            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
375            # Height: 20
376    
377  class PrinterRender(MapRenderer):  class PrinterRenderer(ExportRenderer):
378    
379      # When printing we want to see all layers      # Printing as well as Export / Screen display only the visible layer.
380      honor_visibility = 0      honor_visibility = 1
381    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.76  
changed lines
  Added in v.2394
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