/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 2537 by jonathan, Fri Jan 21 14:01:25 2005 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 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, \
26        wxBITMAP_TYPE_GIF, wxEmptyImage
27    
28    from wxproj import draw_polygon_shape, draw_polygon_init
29    
30    from Thuban.UI.common import Color2wxColour
31    from Thuban.UI.classifier import ClassDataPreviewer
32    from Thuban.UI.scalebar import ScaleBar
33    
34    from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
35         SHAPETYPE_POINT, RAW_SHAPEFILE
36    
37    from Thuban.Model.color import Transparent
38    import Thuban.Model.resource
39    
40  from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \  from baserenderer import BaseRenderer
      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \  
      wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL  
41    
42  from wxproj import draw_polygon_shape  from math import floor
43    
44  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from types import StringType
      SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
45    
46    
47  class MapRenderer:  # Map the strings used for the format parameter of the draw_raster_data
48    # method to the appropriate wxWindows constants
49    raster_format_map = {
50        "BMP": wxBITMAP_TYPE_BMP,
51        "JPEG": wxBITMAP_TYPE_JPEG,
52        "PNG": wxBITMAP_TYPE_PNG,
53        "TIFF": wxBITMAP_TYPE_TIF,
54        "GIF": wxBITMAP_TYPE_GIF,
55        }
56    
57    class MapRenderer(BaseRenderer):
58    
59      """Class to render a map onto a wxDC"""      """Class to render a map onto a wxDC"""
60    
61        TRANSPARENT_PEN = wxTRANSPARENT_PEN
62        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
63    
64        def make_point(self, x, y):
65            return wxPoint(int(round(x)), int(round(y)))
66    
67        def tools_for_property(self, prop):
68            fill = prop.GetFill()
69            if fill is Transparent:
70                brush = self.TRANSPARENT_BRUSH
71            else:
72                brush = wxBrush(Color2wxColour(fill), wxSOLID)
73    
74            stroke = prop.GetLineColor()
75            if stroke is Transparent:
76                pen = self.TRANSPARENT_PEN
77            else:
78                pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
79            return pen, brush
80    
81        def low_level_renderer(self, layer):
82            """Override inherited method to provide more efficient renderers
83    
84            If the underlying data format is not a shapefile or the layer
85            contains points shapes, simply use what the inherited method
86            returns.
87    
88            Otherwise, i.e. for arc and polygon use the more efficient
89            wxproj.draw_polygon_shape and its corresponding parameter
90            created with wxproj.draw_polygon_init.
91            """
92            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
93                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
94                offx, offy = self.offset
95                return (True, draw_polygon_shape,
96                        draw_polygon_init(layer.ShapeStore().Shapefile(),
97                                          self.dc, self.map.projection,
98                                          layer.projection,
99                                          self.scale, -self.scale, offx, offy))
100            else:
101                return BaseRenderer.low_level_renderer(self, layer)
102    
103        def label_font(self):
104            return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
105                          wxNORMAL)
106    
107        def draw_raster_data(self, x,y, data, format = 'BMP', mask = None):
108            if format == 'RAW':
109                image = wxEmptyImage(data[0], data[1])
110                image.SetData(data[2])
111            else:
112                stream = cStringIO.StringIO(data[2])
113                image = wxImageFromStream(stream, raster_format_map[format])
114    
115            bitmap = wxBitmapFromImage(image)
116    
117            if mask is None:
118                self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), False)
119            else:
120                # if we are given a mask object, try to pass it to SetMaskColour,
121                # otherwise assume it's a mask image
122                try:
123                    bitmap.SetMaskColour(mask);
124                    self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
125                except (TypeError):
126                    # implement using a mask image
127                    raise NotImplementedError
128    
129    
130    class ScreenRenderer(MapRenderer):
131    
132        # On the screen we want to see only visible layers by default
133      honor_visibility = 1      honor_visibility = 1
134    
135      def __init__(self, dc, scale, offset, resolution = 72.0,      def RenderMap(self, selected_layer, selected_shapes):
136                   honor_visibility = None):          """Render the map.
         """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())  
137    
138      def draw_shape_layer(self, layer):          Only the given region (a tuple in window coordinates as returned
139          scale = self.scale          by a wxrect's asTuple method) needs to be redrawn. Highlight the
140          offx, offy = self.offset          shapes given by the ids in selected_shapes in the
141            selected_layer.
142            """
143            self.selected_layer = selected_layer
144            self.selected_shapes = selected_shapes
145            self.render_map()
146    
147          fill = layer.fill      def RenderMapIncrementally(self):
148          if fill is None:          """Render the map.
149              brush = wxTRANSPARENT_BRUSH  
150          else:          Only the given region (a tuple in window coordinates as returned
151              color = wxColour(fill.red * 255,          by a wxrect's asTuple method) needs to be redrawn. Highlight the
152                               fill.green * 255,          shapes given by the ids in selected_shapes in the
153                               fill.blue * 255)          selected_layer.
154              brush = wxBrush(color, wxSOLID)          """
155          stroke = layer.stroke          return self.render_map_incrementally()
         if stroke is None:  
             pen = wxTRANSPARENT_PEN  
         else:  
             color = wxColour(stroke.red * 255,  
                              stroke.green * 255,  
                              stroke.blue * 255)  
             pen = wxPen(color, 1, wxSOLID)  
156    
157          map_proj = self.map.projection      def draw_selection_incrementally(self, layer, selected_shapes):
158          layer_proj = layer.projection          """Draw the selected shapes in a emphasized way (i.e.
159            with a special pen and brush.
160            The drawing is performed incrementally, that means every
161            n shapes, the user can have interactions with the map.
162            n is currently fixed to 500.
163    
164            layer -- the layer where the shapes belong to.
165            selected_shapes -- a list of the shape-ids representing the
166                               selected shapes for the given layer.
167            """
168            pen = wxPen(wxBLACK, 3, wxSOLID)
169            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
170    
171          shapetype = layer.ShapeType()          shapetype = layer.ShapeType()
172            useraw, func, param = self.low_level_renderer(layer)
173            args = (pen, brush)
174    
175            # for point shapes we need to find out the properties
176            # to determine the size. Based on table and field,
177            # we can find out the properties for object - see below.
178            if shapetype == SHAPETYPE_POINT:
179                lc = layer.GetClassification()
180                field = layer.GetClassificationColumn()
181                table = layer.ShapeStore().Table()
182    
183            count = 0
184            for index in selected_shapes:
185                count += 1
186                shape = layer.Shape(index)
187    
188                # Get the size of the specific property for this
189                # point
190                if shapetype == SHAPETYPE_POINT and field is not None:
191                    value = table.ReadValue(shape.ShapeID(), field)
192                    group = lc.FindGroup(value)
193                    size = group.GetProperties().GetSize()
194                    args = (pen, brush, size)
195    
196                if useraw:
197                    data = shape.RawData()
198                else:
199                    data = shape.Points()
200                func(param, data, *args)
201                if count % 500 == 0:
202                    yield True
203    
204          if shapetype == SHAPETYPE_POLYGON:      def layer_shapes(self, layer):
205              for i in range(layer.NumShapes()):          """Return the shapeids covered by the region that has to be redrawn
                 self.draw_polygon_shape(layer, i, 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  
             for i in range(layer.NumShapes()):  
                 f(layer, i)  
   
     def draw_polygon_shape(self, layer, index, pen, brush):  
         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)  
206    
207      def projected_points(self, layer, index):          Call the layer's ShapesInRegion method to determine the ids so
208            that it can use the quadtree.
209            """
210            # FIXME: the quad-tree should be built from the projected
211            # coordinates not the lat-long ones because it's not trivial to
212            # determine an appropriate rectangle in lat-long for a given
213            # rectangle in projected coordinates which we have to start from
214            # here.
215          proj = self.map.projection          proj = self.map.projection
216          if proj is not None:          if proj is not None:
             forward = proj.Forward  
         else:  
             forward = None  
         proj = layer.projection  
         if proj is not None:  
217              inverse = proj.Inverse              inverse = proj.Inverse
218          else:          else:
219              inverse = None              inverse = None
220          shape = layer.Shape(index)  
         points = []  
221          scale = self.scale          scale = self.scale
222          offx, offy = self.offset          offx, offy = self.offset
223          for x, y in shape.Points():          xs = []
224            ys = []
225            x, y, width, height = self.region
226            for winx, winy in ((x, y), (x + width, y),
227                               (x + width, y + height), (x, y + height)):
228                px = (winx - offx) / scale
229                py = -(winy - offy) / scale
230              if inverse:              if inverse:
231                  x, y = inverse(x, y)                  px, py = inverse(px, py)
232              if forward:              xs.append(px)
233                  x, y = forward(x, y)              ys.append(py)
234              points.append(wxPoint(x * scale + offx,          left = min(xs)
235                                    -y * scale + offy))          right = max(xs)
236          return points          top = max(ys)
237            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)  
238    
239      def draw_label_layer(self, layer):          return layer.ShapesInRegion((left, bottom, right, top))
         scale = self.scale  
         offx, offy = self.offset  
240    
         font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)  
         self.dc.SetFont(font)  
241    
242          map_proj = self.map.projection  class ExportRenderer(ScreenRenderer):
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
   
         for label in layer.Labels():  
             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)  
243    
244        honor_visibility = 1
245    
246  class ScreenRenderer(MapRenderer):      def __init__(self, *args, **kw):
247            """Initialize the ExportRenderer.
248    
249            In addition to all parameters of the the ScreenRender
250            constructor, this class requires and additional keyword argument
251            destination_region with a tuple (minx, miny, maxx, maxy) giving
252            the region in dc coordinates which is to contain the map.
253            """
254            self.destination_region = kw["destination_region"]
255            del kw["destination_region"]
256            ScreenRenderer.__init__(self, *args, **kw)
257    
258        def RenderMap(self, selected_layer, selected_shapes):
259            """Render the map.
260    
261            The rendering device has been specified during initialisation.
262            The device border distance was set in
263            Thuban.UI.viewport.output_transform().
264    
265            RenderMap renders a frame set (one page frame, one around
266            legend/scalebar and one around the map), the map, the legend and
267            the scalebar on the given DC. The map is rendered with the
268            region displayed in the canvas view, centered on the area
269            available for map display.
270            """
271    
     # On the screen we want to see only visible layers by default  
     honor_visibility = 1  
       
     def RenderMap(self, map, selected_layer, selected_shape):  
272          self.selected_layer = selected_layer          self.selected_layer = selected_layer
273          self.selected_shape = selected_shape          self.selected_shapes = selected_shapes
         self.render_map(map)  
274    
275      def draw_shape_layer(self, layer):          # Get some dimensions
276          MapRenderer.draw_shape_layer(self, layer)          llx, lly, urx, ury = self.region
277          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)  
278    
279            # Manipulate the offset to position the map
280            offx, offy = self.offset
281            # 1. Shift to corner of map drawing area
282            offx = offx + mminx
283            offy = offy + mminy
284    
285            # 2. Center the map on the map drawing area:
286            # region identifies the region on the canvas view:
287            # center of map drawing area - half the size of region: rendering origin
288            self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
289            self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
290    
291            self.offset = (offx+self.shiftx, offy+self.shifty)
292            self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)
293    
294            # Draw the map
295            self.dc.BeginDrawing()
296            self.dc.DestroyClippingRegion()
297            self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
298                                      urx, ury)
299            self.render_map()
300            self.dc.EndDrawing()
301    
302            # Draw the rest (frames, legend, scalebar)
303            self.dc.BeginDrawing()
304            self.dc.DestroyClippingRegion()
305    
306  class PrinterRender(MapRenderer):          # Force the font for Legend drawing
307            font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
308            self.dc.SetFont(font)
309    
310      # When printing we want to see all layers          self.render_frame()
311      honor_visibility = 0          self.render_legend()
312            self.render_scalebar()
313            self.dc.EndDrawing()
314    
315        def render_frame(self):
316            """Render the frames for map and legend/scalebar."""
317    
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    
326            # Page Frame
327            dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
328    
329            # Map Frame
330            llx, lly, urx, ury = self.region
331            dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
332    
333            # Legend Frame
334            dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
335    
336            dc.DestroyClippingRegion()
337            dc.SetClippingRegion(mmaxx+10,mminy,
338                                 (width-20) - (mmaxx+10), mmaxy-mminy)
339    
340        def render_legend(self):
341            """Render the legend on the Map."""
342    
343            previewer = ClassDataPreviewer()
344            dc = self.dc
345            dc.SetPen(wxBLACK_PEN)
346            dc.SetBrush(wxTRANSPARENT_BRUSH)
347    
348            # Dimension stuff
349            width, height = dc.GetSizeTuple()
350            mminx, mminy, mmaxx, mmaxy = self.destination_region
351            textwidth, textheight = dc.GetTextExtent("0")
352            iconwidth  = textheight
353            iconheight = textheight
354            stepy = textheight+3
355            dx = 10
356            posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
357                                    # 5 pix inside legend frame
358            posy = mminy + 5        # 5 pix inside legend frame
359    
360            # Render the legend
361            dc.SetTextForeground(wxBLACK)
362            if self.map.HasLayers():
363                layers = self.map.Layers()[:]
364                layers.reverse()
365                for l in layers:
366                    if l.Visible():
367                        # Render title
368                        dc.DrawText(l.Title(), posx, posy)
369                        posy+=stepy
370                        if l.HasClassification():
371                            # Render classification
372                            clazz = l.GetClassification()
373                            shapeType = l.ShapeType()
374                            for g in clazz:
375                                if g.IsVisible():
376                                    previewer.Draw(dc,
377                                        wxRect(posx+dx, posy,
378                                               iconwidth, iconheight),
379                                        g.GetProperties(), shapeType)
380                                    dc.DrawText(g.GetDisplayText(),
381                                                posx+2*dx+iconwidth, posy)
382                                    posy+=stepy
383    
384        def render_scalebar(self):
385            """Render the scalebar."""
386    
387            scalebar = ScaleBar(self.map)
388    
389            # Dimension stuff
390            width, height = self.dc.GetSizeTuple()
391            mminx, mminy, mmaxx, mmaxy = self.destination_region
392    
393            # Render the scalebar
394            scalebar.DrawScaleBar(self.scale, self.dc,
395                                 (mmaxx+10+5, mmaxy-25),
396                                 ((width-15-5) - (mmaxx+10+5),20)
397                                )
398            # 10 pix between map and legend frame, 5 pix inside legend frame
399            # 25 pix from the legend frame bottom line
400            # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
401            # Height: 20
402    
403    class PrinterRenderer(ExportRenderer):
404    
405        # Printing as well as Export / Screen display only the visible layer.
406        honor_visibility = 1
407    
     RenderMap = MapRenderer.render_map  
       
Legend:
Removed from v.6  
changed lines
  Added in v.2537
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