/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
ViewVC logotype

Diff of /branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 535 by bh, Fri Mar 14 20:42:18 2003 UTC revision 1927 by bh, Mon Nov 10 16:57:35 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  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  
19    
20    from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
21        wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
22        wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
23        wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, wxBITMAP_TYPE_JPEG
24    
25  class MapRenderer:  from wxproj import draw_polygon_shape, draw_polygon_init
26    
27      """Class to render a map onto a wxDC"""  from Thuban.UI.common import Color2wxColour
28    from Thuban.UI.classifier import ClassDataPreviewer
29      honor_visibility = 1  from Thuban.UI.scalebar import ScaleBar
30    
31      def __init__(self, dc, scale, offset, resolution = 72.0,  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
32                   honor_visibility = None):       SHAPETYPE_POINT, RAW_SHAPEFILE
         """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())  
33    
34      def draw_shape_layer(self, layer):  from Thuban.Model.color import Transparent
35          scale = self.scale  import Thuban.Model.resource
         offx, offy = self.offset  
36    
37          map_proj = self.map.projection  from baserenderer import BaseRenderer
         layer_proj = layer.projection  
38    
         shapetype = layer.ShapeType()  
39    
40          brush = wxTRANSPARENT_BRUSH  # Map the strings used for the format parameter of the draw_raster_data
41          pen   = wxTRANSPARENT_PEN  # method to the appropriate wxWindows constants
42    raster_format_map = {
43        "BMP": wxBITMAP_TYPE_BMP,
44        "JPEG": wxBITMAP_TYPE_JPEG,
45        }
46    
47          old_prop = None  class MapRenderer(BaseRenderer):
         lc = layer.GetClassification()  
         field = lc.GetField()  
   
         defaultProps = lc.GetDefaultGroup().GetProperties()  
   
         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  
                 #  
                 prop = lc.GetProperties(value)  
             else:  
                 prop = defaultProps  
48    
49              # don't recreate new objects if they are the same as before      """Class to render a map onto a wxDC"""
             if prop != old_prop:  
                 old_prop = prop  
   
                 if shapetype == SHAPETYPE_ARC:  
                     fill = Color.None  
                 else:  
                     fill = prop.GetFill()  
       
                 if fill is Color.None:  
                     brush = wxTRANSPARENT_BRUSH  
                 else:  
                     color = Color2wxColour(fill)  
                     brush = wxBrush(color, wxSOLID)  
       
                 stroke = prop.GetLineColor()  
                 stroke_width = prop.GetLineWidth()  
                 if stroke is Color.None:  
                     pen = wxTRANSPARENT_PEN  
                 else:  
                     color = Color2wxColour(stroke)  
                     pen = wxPen(color, stroke_width, wxSOLID)  
       
             if shapetype == SHAPETYPE_POINT:  
                 self.dc.SetBrush(brush)  
                 self.dc.SetPen(pen)  
                 self.draw_point_shape(layer, i)  
             else:  
                 self.draw_polygon_shape(layer, i, pen, brush)  
50    
51      def layer_ids(self, layer):      TRANSPARENT_PEN = wxTRANSPARENT_PEN
52          """Return the shape ids of the given layer that have to be drawn.      TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
           
         The default implementation simply returns all ids in the layer.  
         Override in derived classes to be more precise.  
         """  
         return range(layer.NumShapes())  
53    
54      def draw_polygon_shape(self, layer, index, pen, brush):      make_point = wxPoint
         offx, offy = self.offset          
         draw_polygon_shape(layer.shapefile.cobject(), index,  
                            self.dc, pen, brush,  
                            self.map.projection, layer.projection,  
                            self.scale, -self.scale, offx, offy)  
55    
56      def projected_points(self, layer, index):      def tools_for_property(self, prop):
57          proj = self.map.projection          fill = prop.GetFill()
58          if proj is not None:          if fill is Transparent:
59              forward = proj.Forward              brush = self.TRANSPARENT_BRUSH
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
             inverse = proj.Inverse  
60          else:          else:
61              inverse = None              brush = wxBrush(Color2wxColour(fill), wxSOLID)
         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):  
         p = self.projected_points(layer, index)[0]  
         radius = self.resolution * 5  
         self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)  
62    
63      def draw_label_layer(self, layer):          stroke = prop.GetLineColor()
64          scale = self.scale          if stroke is Transparent:
65          offx, offy = self.offset              pen = self.TRANSPARENT_PEN
66            else:
67                pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
68            return pen, brush
69    
70          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)      def low_level_renderer(self, layer):
71          self.dc.SetFont(font)          """Override inherited method to provide more efficient renderers
72    
73          map_proj = self.map.projection          If the underlying data format is not a shapefile or the layer
74          if map_proj is not None:          contains points shapes, simply use what the inherited method
75              forward = map_proj.Forward          returns.
76    
77            Otherwise, i.e. for arc and polygon use the more efficient
78            wxproj.draw_polygon_shape and its corresponding parameter
79            created with wxproj.draw_polygon_init.
80            """
81            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
82                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
83                offx, offy = self.offset
84                return (True, draw_polygon_shape,
85                        draw_polygon_init(layer.ShapeStore().Shapefile(),
86                                          self.dc, self.map.projection,
87                                          layer.projection,
88                                          self.scale, -self.scale, offx, offy))
89          else:          else:
90              forward = None              return BaseRenderer.low_level_renderer(self, layer)
91    
92          for label in layer.Labels():      def label_font(self):
93              x = label.x          return wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
94              y = label.y  
95              text = label.text      def draw_raster_data(self, data, format = 'BMP'):
96              if forward:          stream = cStringIO.StringIO(data)
97                  x, y = forward(x, y)          image = wxImageFromStream(stream, raster_format_map[format])
98              x = x * scale + offx          bitmap = wxBitmapFromImage(image)
99              y = -y * scale + offy          self.dc.DrawBitmap(bitmap, 0, 0)
             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)  
100    
101    
102  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
103    
104      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
105      honor_visibility = 1      honor_visibility = 1
106        
107      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, selected_layer, selected_shapes):
108          """Render the map.          """Render the map.
109    
110          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
# Line 234  class ScreenRenderer(MapRenderer): Line 112  class ScreenRenderer(MapRenderer):
112          shapes given by the ids in selected_shapes in the          shapes given by the ids in selected_shapes in the
113          selected_layer.          selected_layer.
114          """          """
         self.update_region = region  
115          self.selected_layer = selected_layer          self.selected_layer = selected_layer
116          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
117          self.render_map(map)          self.render_map()
118    
119      def draw_shape_layer(self, layer):      def RenderMapIncrementally(self):
120          MapRenderer.draw_shape_layer(self, layer)          """Render the map.
121          if layer is self.selected_layer and self.selected_shapes:  
122              pen = wxPen(wxBLACK, 3, wxSOLID)          Only the given region (a tuple in window coordinates as returned
123              brush = wxBrush(wxBLACK, wxCROSS_HATCH)          by a wxrect's asTuple method) needs to be redrawn. Highlight the
124            shapes given by the ids in selected_shapes in the
125              shapetype = layer.ShapeType()          selected_layer.
126              if shapetype == SHAPETYPE_POLYGON:          """
127                  func = self.draw_polygon_shape          return self.render_map_incrementally()
                 args = (pen, brush)  
             elif shapetype == SHAPETYPE_ARC:  
                 func = self.draw_polygon_shape  
                 args = (pen, None)  
             elif shapetype == SHAPETYPE_POINT:  
                 self.dc.SetBrush(brush)  
                 self.dc.SetPen(pen)  
                 func = self.draw_point_shape  
                 args = ()  
             else:  
                 raise TypeError(_("Unhandled shape type %s") % shapetype)  
128    
129              for index in self.selected_shapes:      def draw_selection_incrementally(self, layer, selected_shapes):
130                  func(layer, index, *args)          pen = wxPen(wxBLACK, 3, wxSOLID)
131            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
132    
133      def layer_ids(self, layer):          shapetype = layer.ShapeType()
134            useraw, func, param = self.low_level_renderer(layer)
135            args = (pen, brush)
136            count = 0
137            for index in selected_shapes:
138                count += 1
139                shape = layer.Shape(index)
140                if useraw:
141                    data = shape.RawData()
142                else:
143                    data = shape.Points()
144                func(param, data, *args)
145                if count % 500 == 0:
146                    yield True
147    
148        def layer_shapes(self, layer):
149          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
150    
151          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 284  class ScreenRenderer(MapRenderer): Line 166  class ScreenRenderer(MapRenderer):
166          offx, offy = self.offset          offx, offy = self.offset
167          xs = []          xs = []
168          ys = []          ys = []
169          x, y, width, height = self.update_region          x, y, width, height = self.region
170          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
171                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
172              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 301  class ScreenRenderer(MapRenderer): Line 183  class ScreenRenderer(MapRenderer):
183          return layer.ShapesInRegion((left, bottom, right, top))          return layer.ShapesInRegion((left, bottom, right, top))
184    
185    
186  class PrinterRender(MapRenderer):  class ExportRenderer(ScreenRenderer):
187    
188        honor_visibility = 1
189    
190        def __init__(self, *args, **kw):
191            """Initialize the ExportRenderer.
192    
193            In addition to all parameters of the the ScreenRender
194            constructor, this class requires and additional keyword argument
195            destination_region with a tuple (minx, miny, maxx, maxy) giving
196            the region in dc coordinates which is to contain the map.
197            """
198            self.destination_region = kw["destination_region"]
199            del kw["destination_region"]
200            ScreenRenderer.__init__(self, *args, **kw)
201    
202        def RenderMap(self, selected_layer, selected_shapes):
203            """Render the map.
204    
205            The rendering device has been specified during initialisation.
206            The device border distance was set in
207            Thuban.UI.viewport.output_transform().
208    
209            RenderMap renders a frame set (one page frame, one around
210            legend/scalebar and one around the map), the map, the legend and
211            the scalebar on the given DC. The map is rendered with the
212            region displayed in the canvas view, centered on the area
213            available for map display.
214            """
215    
216            self.selected_layer = selected_layer
217            self.selected_shapes = selected_shapes
218    
219            # Get some dimensions
220            llx, lly, urx, ury = self.region
221            mminx, mminy, mmaxx, mmaxy = self.destination_region
222    
223      # When printing we want to see all layers          # Manipulate the offset to position the map
224      honor_visibility = 0          offx, offy = self.offset
225            # 1. Shift to corner of map drawing area
226            offx = offx + mminx
227            offy = offy + mminy
228    
229            # 2. Center the map on the map drawing area:
230            # region identifies the region on the canvas view:
231            # center of map drawing area - half the size of region: rendering origin
232            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
233            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
234    
235            self.offset = (offx+self.shiftx, offy+self.shifty)
236    
237            # Draw the map
238            self.dc.BeginDrawing()
239            self.dc.DestroyClippingRegion()
240            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
241                                      urx, ury)
242            self.render_map()
243            self.dc.EndDrawing()
244    
245            # Draw the rest (frames, legend, scalebar)
246            self.dc.BeginDrawing()
247            self.dc.DestroyClippingRegion()
248    
249            # Force the font for Legend drawing
250            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
251            self.dc.SetFont(font)
252    
253            self.render_frame()
254            self.render_legend()
255            self.render_scalebar()
256            self.dc.EndDrawing()
257    
258        def render_frame(self):
259            """Render the frames for map and legend/scalebar."""
260    
261            dc = self.dc
262            dc.SetPen(wxBLACK_PEN)
263            dc.SetBrush(wxTRANSPARENT_BRUSH)
264    
265            # Dimension stuff
266            width, height = dc.GetSizeTuple()
267            mminx, mminy, mmaxx, mmaxy = self.destination_region
268    
269            # Page Frame
270            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
271    
272            # Map Frame
273            llx, lly, urx, ury = self.region
274            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
275    
276            # Legend Frame
277            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
278    
279            dc.DestroyClippingRegion()
280            dc.SetClippingRegion(mmaxx+10,mminy,
281                                 (width-20) - (mmaxx+10), mmaxy-mminy)
282    
283        def render_legend(self):
284            """Render the legend on the Map."""
285    
286            previewer = ClassDataPreviewer()
287            dc = self.dc
288            dc.SetPen(wxBLACK_PEN)
289            dc.SetBrush(wxTRANSPARENT_BRUSH)
290    
291            # Dimension stuff
292            width, height = dc.GetSizeTuple()
293            mminx, mminy, mmaxx, mmaxy = self.destination_region
294            textwidth, textheight = dc.GetTextExtent("0")
295            iconwidth  = textheight
296            iconheight = textheight
297            stepy = textheight+3
298            dx = 10
299            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
300                                    # 5 pix inside legend frame
301            posy = mminy + 5        # 5 pix inside legend frame
302    
303            # Render the legend
304            dc.SetTextForeground(wxBLACK)
305            if self.map.HasLayers():
306                layers = self.map.Layers()[:]
307                layers.reverse()
308                for l in layers:
309                    if l.Visible():
310                        # Render title
311                        dc.DrawText(l.Title(), posx, posy)
312                        posy+=stepy
313                        if l.HasClassification():
314                            # Render classification
315                            clazz = l.GetClassification()
316                            shapeType = l.ShapeType()
317                            for g in clazz:
318                                if g.IsVisible():
319                                    previewer.Draw(dc,
320                                        wxRect(posx+dx, posy,
321                                               iconwidth, iconheight),
322                                        g.GetProperties(), shapeType)
323                                    dc.DrawText(g.GetDisplayText(),
324                                                posx+2*dx+iconwidth, posy)
325                                    posy+=stepy
326    
327        def render_scalebar(self):
328            """Render the scalebar."""
329    
330            scalebar = ScaleBar(self.map)
331    
332            # Dimension stuff
333            width, height = self.dc.GetSizeTuple()
334            mminx, mminy, mmaxx, mmaxy = self.destination_region
335    
336            # Render the scalebar
337            scalebar.DrawScaleBar(self.scale, self.dc,
338                                 (mmaxx+10+5, mmaxy-25),
339                                 ((width-15-5) - (mmaxx+10+5),20)
340                                )
341            # 10 pix between map and legend frame, 5 pix inside legend frame
342            # 25 pix from the legend frame bottom line
343            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
344            # Height: 20
345    
346    class PrinterRenderer(ExportRenderer):
347    
348        # Printing as well as Export / Screen display only the visible layer.
349        honor_visibility = 1
350    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.535  
changed lines
  Added in v.1927
[email protected]
 ViewVC Help
Powered by ViewVC 1.1.26