/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 686 by bh, Wed Apr 16 13:22:25 2003 UTC revision 1866 by bh, Mon Oct 27 13:01:58 2003 UTC
# Line 2  Line 2 
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
5    # Frank Koormann <[email protected]>
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
9    
10  __version__ = "$Revision$"  from __future__ import generators
11    
12  from wxPython.wx import wxPoint, wxPen, wxBrush, wxFont, \  __version__ = "$Revision$"
13       wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  # $Source$
14       wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  # $Id$
15    
16  from wxproj import draw_polygon_shape, draw_polygon_init  import cStringIO
17    
18  from Thuban import _  from Thuban import _
 from Thuban.UI.common import *  
   
 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  
   
 from Thuban.Model.classification import Classification  
 from Thuban.Model.color import Color  
   
   
 class MapRenderer:  
   
     """Class to render a map onto a wxDC"""  
   
     honor_visibility = 1  
   
     def __init__(self, dc, scale, offset, resolution = 72.0,  
                  honor_visibility = None):  
         """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  
   
         assert scale > 0  
   
         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())  
   
     def draw_shape_layer(self, layer):  
         scale = self.scale  
         offx, offy = self.offset  
   
         map_proj = self.map.projection  
         layer_proj = layer.projection  
   
         shapetype = layer.ShapeType()  
   
         brush = wxTRANSPARENT_BRUSH  
         pen   = wxTRANSPARENT_PEN  
19    
20          old_prop = None  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
21          lc = layer.GetClassification()      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
22          field = lc.GetField()      wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
23        wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP
24    
25    from wxproj import draw_polygon_shape, draw_polygon_init
26    
27          if shapetype != SHAPETYPE_POINT:  from Thuban.UI.common import Color2wxColour
28              polygon_render_param = self.polygon_render_param(layer)  from Thuban.UI.classifier import ClassDataPreviewer
29    from Thuban.UI.scalebar import ScaleBar
         for i in self.layer_ids(layer):  
             value = None  
   
             if field is not None:  
                 try:  
                     record = layer.table.read_record(i)  
                     if record is not None:  
                         value = record[field]  
                 except:  
                     pass  
   
                 #  
                 # if the above statements fail 'value' should  
                 # be null, at which point this call will  
                 # at least retreive the NullData  
                 #  
   
                 group = lc.FindGroup(value)  
   
                 #prop = lc.GetProperties(value)  
             else:  
                 group = lc.GetDefaultGroup()  
   
30    
31              if not group.IsVisible():  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
32                  continue       SHAPETYPE_POINT, RAW_SHAPEFILE
33    
34              prop = group.GetProperties()  from Thuban.Model.color import Transparent
35    import Thuban.Model.resource
36    
37              # don't recreate new objects if they are the same as before  from baserenderer import BaseRenderer
             if prop != old_prop:  
                 old_prop = prop  
38    
39                  if shapetype == SHAPETYPE_ARC:  class MapRenderer(BaseRenderer):
                     fill = Color.Transparent  
                 else:  
                     fill = prop.GetFill()  
40    
41        """Class to render a map onto a wxDC"""
42    
43                  if fill is Color.Transparent:      TRANSPARENT_PEN = wxTRANSPARENT_PEN
44                      brush = wxTRANSPARENT_BRUSH      TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
                 else:  
                     color = Color2wxColour(fill)  
                     brush = wxBrush(color, wxSOLID)  
45    
46                  stroke = prop.GetLineColor()      make_point = wxPoint
                 stroke_width = prop.GetLineWidth()  
                 if stroke is Color.Transparent:  
                     pen = wxTRANSPARENT_PEN  
                 else:  
                     color = Color2wxColour(stroke)  
                     pen = wxPen(color, stroke_width, wxSOLID)  
47    
48        def tools_for_property(self, prop):
49            fill = prop.GetFill()
50            if fill is Transparent:
51                brush = self.TRANSPARENT_BRUSH
52            else:
53                brush = wxBrush(Color2wxColour(fill), wxSOLID)
54    
55              if shapetype == SHAPETYPE_POINT:          stroke = prop.GetLineColor()
56                  self.dc.SetBrush(brush)          if stroke is Transparent:
57                  self.dc.SetPen(pen)              pen = self.TRANSPARENT_PEN
58                  self.draw_point_shape(layer, i)          else:
59              else:              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
60                  self.draw_polygon_shape(polygon_render_param, i, pen, brush)          return pen, brush
61    
62      def layer_ids(self, layer):      def low_level_renderer(self, layer):
63          """Return the shape ids of the given layer that have to be drawn.          """Override inherited method to provide more efficient renderers
64    
65          The default implementation simply returns all ids in the layer.          If the underlying data format is not a shapefile or the layer
66          Override in derived classes to be more precise.          contains points shapes, simply use what the inherited method
67            returns.
68    
69            Otherwise, i.e. for arc and polygon use the more efficient
70            wxproj.draw_polygon_shape and its corresponding parameter
71            created with wxproj.draw_polygon_init.
72          """          """
73          return range(layer.NumShapes())          if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
74                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
75      def polygon_render_param(self, layer):              offx, offy = self.offset
76          """Return the low-lever render parameter for the layer"""              return (True, draw_polygon_shape,
77          offx, offy = self.offset                      draw_polygon_init(layer.ShapeStore().Shapefile(),
78          return draw_polygon_init(layer.shapefile, self.dc,                                        self.dc, self.map.projection,
79                                   self.map.projection,                                        layer.projection,
80                                   layer.projection,                                        self.scale, -self.scale, offx, offy))
                                  self.scale, -self.scale,  
                                  offx, offy)  
   
     def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):  
         draw_polygon_shape(draw_polygon_info, index, pen, brush)  
   
     def projected_points(self, layer, index):  
         proj = self.map.projection  
         if proj is not None:  
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
             inverse = proj.Inverse  
81          else:          else:
82              inverse = None              return BaseRenderer.low_level_renderer(self, layer)
         shape = layer.Shape(index)  
         points = []  
         scale = self.scale  
         offx, offy = self.offset  
         for x, y in shape.Points():  
             if inverse:  
                 x, y = inverse(x, y)  
             if forward:  
                 x, y = forward(x, y)  
             points.append(wxPoint(x * scale + offx,  
                                   -y * scale + offy))  
         return points  
   
     def draw_arc_shape(self, layer, index):  
         points = self.projected_points(layer, index)  
         self.dc.DrawLines(points)  
   
     def draw_point_shape(self, layer, index):  
         pp = self.projected_points(layer, index)  
   
         if len(pp) == 0: return # ignore Null Shapes which have no points  
   
         p = pp[0]  
         radius = self.resolution * 5  
         self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)  
83    
84      def draw_label_layer(self, layer):      def label_font(self):
85          scale = self.scale          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
         offx, offy = self.offset  
   
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
   
         map_proj = self.map.projection  
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
86    
87          for label in layer.Labels():      def draw_raster_data(self, data):
88              x = label.x          stream = cStringIO.StringIO(data)
89              y = label.y          image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
90              text = label.text          bitmap = wxBitmapFromImage(image)
91              if forward:          self.dc.DrawBitmap(bitmap, 0, 0)
                 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)  
92    
93    
94  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
95    
96      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
97      honor_visibility = 1      honor_visibility = 1
98        
99      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, selected_layer, selected_shapes):
100          """Render the map.          """Render the map.
101    
102          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
# Line 259  class ScreenRenderer(MapRenderer): Line 104  class ScreenRenderer(MapRenderer):
104          shapes given by the ids in selected_shapes in the          shapes given by the ids in selected_shapes in the
105          selected_layer.          selected_layer.
106          """          """
         self.update_region = region  
107          self.selected_layer = selected_layer          self.selected_layer = selected_layer
108          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
109          self.render_map(map)          self.render_map()
110    
111      def draw_shape_layer(self, layer):      def RenderMapIncrementally(self):
112          MapRenderer.draw_shape_layer(self, layer)          """Render the map.
         if layer is self.selected_layer and self.selected_shapes:  
             pen = wxPen(wxBLACK, 3, wxSOLID)  
             brush = wxBrush(wxBLACK, wxCROSS_HATCH)  
   
             shapetype = layer.ShapeType()  
             if shapetype == SHAPETYPE_POLYGON:  
                 offx, offy = self.offset  
                 renderparam = self.polygon_render_param(layer)  
                 func = self.draw_polygon_shape  
                 args = (pen, brush)  
             elif shapetype == SHAPETYPE_ARC:  
                 renderparam = self.polygon_render_param(layer)  
                 func = self.draw_polygon_shape  
                 args = (pen, None)  
             elif shapetype == SHAPETYPE_POINT:  
                 renderparam = layer  
                 self.dc.SetBrush(brush)  
                 self.dc.SetPen(pen)  
                 func = self.draw_point_shape  
                 args = ()  
             else:  
                 raise TypeError(_("Unhandled shape type %s") % shapetype)  
113    
114              for index in self.selected_shapes:          Only the given region (a tuple in window coordinates as returned
115                  func(renderparam, index, *args)          by a wxrect's asTuple method) needs to be redrawn. Highlight the
116            shapes given by the ids in selected_shapes in the
117            selected_layer.
118            """
119            return self.render_map_incrementally()
120    
121        def draw_selection_incrementally(self, layer, selected_shapes):
122            pen = wxPen(wxBLACK, 3, wxSOLID)
123            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
124    
125            shapetype = layer.ShapeType()
126            useraw, func, param = self.low_level_renderer(layer)
127            args = (pen, brush)
128            count = 0
129            for index in selected_shapes:
130                count += 1
131                shape = layer.Shape(index)
132                if useraw:
133                    data = shape.RawData()
134                else:
135                    data = shape.Points()
136                func(param, data, *args)
137                if count % 500 == 0:
138                    yield True
139    
140      def layer_ids(self, layer):      def layer_shapes(self, layer):
141          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
142    
143          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 314  class ScreenRenderer(MapRenderer): Line 158  class ScreenRenderer(MapRenderer):
158          offx, offy = self.offset          offx, offy = self.offset
159          xs = []          xs = []
160          ys = []          ys = []
161          x, y, width, height = self.update_region          x, y, width, height = self.region
162          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
163                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
164              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 331  class ScreenRenderer(MapRenderer): Line 175  class ScreenRenderer(MapRenderer):
175          return layer.ShapesInRegion((left, bottom, right, top))          return layer.ShapesInRegion((left, bottom, right, top))
176    
177    
178  class PrinterRender(MapRenderer):  class ExportRenderer(ScreenRenderer):
179    
180      # When printing we want to see all layers      honor_visibility = 1
181      honor_visibility = 0  
182        def __init__(self, *args, **kw):
183            """Initialize the ExportRenderer.
184    
185            In addition to all parameters of the the ScreenRender
186            constructor, this class requires and additional keyword argument
187            destination_region with a tuple (minx, miny, maxx, maxy) giving
188            the region in dc coordinates which is to contain the map.
189            """
190            self.destination_region = kw["destination_region"]
191            del kw["destination_region"]
192            ScreenRenderer.__init__(self, *args, **kw)
193    
194        def RenderMap(self, selected_layer, selected_shapes):
195            """Render the map.
196    
197            The rendering device has been specified during initialisation.
198            The device border distance was set in
199            Thuban.UI.viewport.output_transform().
200    
201            RenderMap renders a frame set (one page frame, one around
202            legend/scalebar and one around the map), the map, the legend and
203            the scalebar on the given DC. The map is rendered with the
204            region displayed in the canvas view, centered on the area
205            available for map display.
206            """
207    
208            self.selected_layer = selected_layer
209            self.selected_shapes = selected_shapes
210    
211            # Get some dimensions
212            llx, lly, urx, ury = self.region
213            mminx, mminy, mmaxx, mmaxy = self.destination_region
214    
215            # Manipulate the offset to position the map
216            offx, offy = self.offset
217            # 1. Shift to corner of map drawing area
218            offx = offx + mminx
219            offy = offy + mminy
220    
221            # 2. Center the map on the map drawing area:
222            # region identifies the region on the canvas view:
223            # center of map drawing area - half the size of region: rendering origin
224            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
225            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
226    
227            self.offset = (offx+self.shiftx, offy+self.shifty)
228    
229            # Draw the map
230            self.dc.BeginDrawing()
231            self.dc.DestroyClippingRegion()
232            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
233                                      urx, ury)
234            self.render_map()
235            self.dc.EndDrawing()
236    
237            # Draw the rest (frames, legend, scalebar)
238            self.dc.BeginDrawing()
239            self.dc.DestroyClippingRegion()
240    
241            # Force the font for Legend drawing
242            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
243            self.dc.SetFont(font)
244    
245            self.render_frame()
246            self.render_legend()
247            self.render_scalebar()
248            self.dc.EndDrawing()
249    
250        def render_frame(self):
251            """Render the frames for map and legend/scalebar."""
252    
253            dc = self.dc
254            dc.SetPen(wxBLACK_PEN)
255            dc.SetBrush(wxTRANSPARENT_BRUSH)
256    
257            # Dimension stuff
258            width, height = dc.GetSizeTuple()
259            mminx, mminy, mmaxx, mmaxy = self.destination_region
260    
261            # Page Frame
262            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
263    
264            # Map Frame
265            llx, lly, urx, ury = self.region
266            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
267    
268            # Legend Frame
269            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
270    
271            dc.DestroyClippingRegion()
272            dc.SetClippingRegion(mmaxx+10,mminy,
273                                 (width-20) - (mmaxx+10), mmaxy-mminy)
274    
275        def render_legend(self):
276            """Render the legend on the Map."""
277    
278            previewer = ClassDataPreviewer()
279            dc = self.dc
280            dc.SetPen(wxBLACK_PEN)
281            dc.SetBrush(wxTRANSPARENT_BRUSH)
282    
283            # Dimension stuff
284            width, height = dc.GetSizeTuple()
285            mminx, mminy, mmaxx, mmaxy = self.destination_region
286            textwidth, textheight = dc.GetTextExtent("0")
287            iconwidth  = textheight
288            iconheight = textheight
289            stepy = textheight+3
290            dx = 10
291            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
292                                    # 5 pix inside legend frame
293            posy = mminy + 5        # 5 pix inside legend frame
294    
295            # Render the legend
296            dc.SetTextForeground(wxBLACK)
297            if self.map.HasLayers():
298                layers = self.map.Layers()[:]
299                layers.reverse()
300                for l in layers:
301                    if l.Visible():
302                        # Render title
303                        dc.DrawText(l.Title(), posx, posy)
304                        posy+=stepy
305                        if l.HasClassification():
306                            # Render classification
307                            clazz = l.GetClassification()
308                            shapeType = l.ShapeType()
309                            for g in clazz:
310                                if g.IsVisible():
311                                    previewer.Draw(dc,
312                                        wxRect(posx+dx, posy,
313                                               iconwidth, iconheight),
314                                        g.GetProperties(), shapeType)
315                                    dc.DrawText(g.GetDisplayText(),
316                                                posx+2*dx+iconwidth, posy)
317                                    posy+=stepy
318    
319        def render_scalebar(self):
320            """Render the scalebar."""
321    
322            scalebar = ScaleBar(self.map)
323    
324            # Dimension stuff
325            width, height = self.dc.GetSizeTuple()
326            mminx, mminy, mmaxx, mmaxy = self.destination_region
327    
328            # Render the scalebar
329            scalebar.DrawScaleBar(self.scale, self.dc,
330                                 (mmaxx+10+5, mmaxy-25),
331                                 ((width-15-5) - (mmaxx+10+5),20)
332                                )
333            # 10 pix between map and legend frame, 5 pix inside legend frame
334            # 25 pix from the legend frame bottom line
335            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
336            # Height: 20
337    
338    class PrinterRenderer(ExportRenderer):
339    
340        # Printing as well as Export / Screen display only the visible layer.
341        honor_visibility = 1
342    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.686  
changed lines
  Added in v.1866
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