/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 535 by bh, Fri Mar 14 20:42:18 2003 UTC revision 1111 by bh, Fri May 30 09:54:48 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Frank Koormann <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 11  Classes for display of a map and interac Line 12  Classes for display of a map and interac
12    
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    
15    from Thuban import _
16    
17    import sys
18    import os.path
19    
20  from math import hypot  from math import hypot
21    
22  from wxPython.wx import wxWindow,\  from wxPython.wx import wxWindow,\
23       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
24       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW, \
25         wxBITMAP_TYPE_XPM, wxBeginBusyCursor, wxEndBusyCursor, wxCursor, \
26         wxImageFromBitmap, wxPlatform
27    
28    # Export related stuff
29    if wxPlatform == '__WXMSW__':
30        from wxPython.wx import wxMetaFileDC
31    from wxPython.wx import wxFileDialog, wxSAVE, wxOVERWRITE_PROMPT, wxID_OK
32    
33  from wxPython import wx  from wxPython import wx
34    
35  from wxproj import point_in_polygon_shape, shape_centroid  from wxproj import point_in_polygon_shape, shape_centroid
36    
   
37  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \
38       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED       MAP_LAYERS_CHANGED, LAYER_CHANGED, LAYER_VISIBILITY_CHANGED
39  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
40       SHAPETYPE_POINT       SHAPETYPE_POINT
41  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
# Line 32  from Thuban.Model.label import ALIGN_CEN Line 43  from Thuban.Model.label import ALIGN_CEN
43  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
44  from Thuban.Model.color import Color  from Thuban.Model.color import Color
45    
46    import resource
47    
48  from selection import Selection  from selection import Selection
49  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
50    
51  import labeldialog  import labeldialog
52    
53  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION, \
54                         SCALE_CHANGED
55    
56    
57  #  #
# Line 217  class LabelTool(Tool): Line 231  class LabelTool(Tool):
231          self.view.LabelShapeAt(event.m_x, event.m_y)          self.view.LabelShapeAt(event.m_x, event.m_y)
232    
233    
   
   
234  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.wxPrintout):
235    
236      """      """
237      wxPrintout class for printing Thuban maps      wxPrintout class for printing Thuban maps
238      """      """
239    
240      def __init__(self, map):      def __init__(self, canvas, map, region, selected_layer, selected_shapes):
241          wx.wxPrintout.__init__(self)          wx.wxPrintout.__init__(self)
242            self.canvas = canvas
243          self.map = map          self.map = map
244            self.region = region
245            self.selected_layer = selected_layer
246            self.selected_shapes = selected_shapes
247    
248      def GetPageInfo(self):      def GetPageInfo(self):
249          return (1, 1, 1, 1)          return (1, 1, 1, 1)
# Line 241  class MapPrintout(wx.wxPrintout): Line 257  class MapPrintout(wx.wxPrintout):
257    
258      def draw_on_dc(self, dc):      def draw_on_dc(self, dc):
259          width, height = self.GetPageSizePixels()          width, height = self.GetPageSizePixels()
260          llx, lly, urx, ury = self.map.ProjectedBoundingBox()          scale, offset, mapregion = OutputTransform(self.canvas.scale,
261          scalex = width / (urx - llx)                                                     self.canvas.offset,
262          scaley = height / (ury - lly)                                                     self.canvas.GetSizeTuple(),
263          scale = min(scalex, scaley)                                                     self.GetPageSizePixels())
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
   
264          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
265          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          renderer = PrinterRenderer(dc, scale, offset, resolution = resy)
266          renderer.RenderMap(self.map)          x, y, width, height = self.region
267          return wx.true          canvas_scale = self.canvas.scale
268            renderer.RenderMap(self.map,
269                               (0,0,
270                                    (width/canvas_scale)*scale,
271                                    (height/canvas_scale)*scale),
272                                    mapregion,
273                               self.selected_layer, self.selected_shapes)
274            return True
275    
276    
277  class MapCanvas(wxWindow, Publisher):  class MapCanvas(wxWindow, Publisher):
# Line 259  class MapCanvas(wxWindow, Publisher): Line 279  class MapCanvas(wxWindow, Publisher):
279      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
280    
281      # Some messages that can be subscribed/unsubscribed directly through      # Some messages that can be subscribed/unsubscribed directly through
282      # the MapCanvas come in fact from other objects. This is a map to      # the MapCanvas come in fact from other objects. This is a dict
283      # map those messages to the names of the instance variables they      # mapping those messages to the names of the instance variables they
284      # actually come from. This delegation is implemented in the      # actually come from. The delegation is implemented in the Subscribe
285      # Subscribe and unsubscribed methods      # and Unsubscribe methods
286      delegated_messages = {LAYER_SELECTED: "selection",      delegated_messages = {LAYER_SELECTED: "selection",
287                            SHAPES_SELECTED: "selection"}                            SHAPES_SELECTED: "selection"}
288    
# Line 271  class MapCanvas(wxWindow, Publisher): Line 291  class MapCanvas(wxWindow, Publisher):
291      delegated_methods = {"SelectLayer": "selection",      delegated_methods = {"SelectLayer": "selection",
292                           "SelectShapes": "selection",                           "SelectShapes": "selection",
293                           "SelectedLayer": "selection",                           "SelectedLayer": "selection",
294                           "HasSelectedLayer": "selection"}                           "HasSelectedLayer": "selection",
295                             "HasSelectedShapes": "selection",
296                             "SelectedShapes": "selection"}
297    
298      def __init__(self, parent, winid):      def __init__(self, parent, winid):
299          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
# Line 353  class MapCanvas(wxWindow, Publisher): Line 375  class MapCanvas(wxWindow, Publisher):
375    
376      def OnPaint(self, event):      def OnPaint(self, event):
377          dc = wxPaintDC(self)          dc = wxPaintDC(self)
378          if self.map is not None and self.map.HasLayers():          clear = self.map is None or not self.map.HasLayers()
             self.do_redraw()  
         else:  
             # If we've got no map or if the map is empty, simply clear  
             # the screen.  
379    
380              # XXX it's probably possible to get rid of this. The          wxBeginBusyCursor()
381              # background color of the window is already white and the          try:
382              # only thing we may have to do is to call self.Refresh()              if not clear:
383              # with a true argument in the right places.                  self.do_redraw()
384              dc.BeginDrawing()                  try:
385              dc.Clear()                      pass
386              dc.EndDrawing()                  except:
387                        print "Error during drawing:", sys.exc_info()[0]
388                        clear = True
389    
390                if clear:
391                    # If we've got no map or if the map is empty, simply clear
392                    # the screen.
393    
394                    # XXX it's probably possible to get rid of this. The
395                    # background color of the window is already white and the
396                    # only thing we may have to do is to call self.Refresh()
397                    # with a true argument in the right places.
398                    dc.BeginDrawing()
399                    dc.Clear()
400                    dc.EndDrawing()
401            finally:
402                wxEndBusyCursor()
403    
404      def do_redraw(self):      def do_redraw(self):
405          # This should only be called if we have a non-empty map.          # This should only be called if we have a non-empty map.
# Line 383  class MapCanvas(wxWindow, Publisher): Line 417  class MapCanvas(wxWindow, Publisher):
417              dc.BeginDrawing()              dc.BeginDrawing()
418    
419              # clear the background              # clear the background
420              dc.SetBrush(wx.wxWHITE_BRUSH)              #dc.SetBrush(wx.wxWHITE_BRUSH)
421              dc.SetPen(wx.wxTRANSPARENT_PEN)              #dc.SetPen(wx.wxTRANSPARENT_PEN)
422              dc.DrawRectangle(0, 0, width, height)              #dc.DrawRectangle(0, 0, width, height)
423                dc.SetBackground(wx.wxWHITE_BRUSH)
424                dc.Clear()
425    
426              selected_layer = self.selection.SelectedLayer()              selected_layer = self.selection.SelectedLayer()
427              selected_shapes = self.selection.SelectedShapes()              selected_shapes = self.selection.SelectedShapes()
# Line 410  class MapCanvas(wxWindow, Publisher): Line 446  class MapCanvas(wxWindow, Publisher):
446          clientdc.Blit(0, 0, width, height, dc, 0, 0)          clientdc.Blit(0, 0, width, height, dc, 0, 0)
447          clientdc.EndDrawing()          clientdc.EndDrawing()
448    
449        def Export(self):
450            if self.scale == 0:
451                return
452    
453            if hasattr(self, "export_path"):
454                export_path = self.export_path
455            else:
456                export_path="."
457            dlg = wxFileDialog(self, _("Export Map"), export_path, "",
458                               "Enhanced Metafile (*.wmf)|*.wmf",
459                               wxSAVE|wxOVERWRITE_PROMPT)
460            if dlg.ShowModal() == wxID_OK:
461                self.export_path = os.path.dirname(dlg.GetPath())
462                dc = wxMetaFileDC(dlg.GetPath())
463        
464                scale, offset, mapregion = OutputTransform(self.scale,
465                                                           self.offset,
466                                                           self.GetSizeTuple(),
467                                                           dc.GetSizeTuple())
468    
469                selected_layer = self.selection.SelectedLayer()
470                selected_shapes = self.selection.SelectedShapes()
471    
472                renderer = ExportRenderer(dc, scale, offset)
473    
474                # Pass the entire bitmap as update region to the renderer.
475                # We're redrawing the whole bitmap, after all.
476                width, height = self.GetSizeTuple()
477                renderer.RenderMap(self.map,
478                                    (0,0,
479                                        (width/self.scale)*scale,
480                                        (height/self.scale)*scale),
481                                    mapregion,
482                                    selected_layer, selected_shapes)
483                dc.EndDrawing()
484                dc.Close()
485            dlg.Destroy()
486            
487      def Print(self):      def Print(self):
488          printer = wx.wxPrinter()          printer = wx.wxPrinter()
489          printout = MapPrintout(self.map)          width, height = self.GetSizeTuple()
490          printer.Print(self, printout, wx.true)          selected_layer = self.selection.SelectedLayer()
491            selected_shapes = self.selection.SelectedShapes()
492            
493            printout = MapPrintout(self, self.map, (0, 0, width, height),
494                                   selected_layer, selected_shapes)
495            printer.Print(self, printout, True)
496          printout.Destroy()          printout.Destroy()
497    
498      def SetMap(self, map):      def SetMap(self, map):
499          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
500                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
501          if self.map is not None:          if self.map is not None:
502              for channel in redraw_channels:              for channel in redraw_channels:
# Line 452  class MapCanvas(wxWindow, Publisher): Line 531  class MapCanvas(wxWindow, Publisher):
531          self.full_redraw()          self.full_redraw()
532    
533      def set_view_transform(self, scale, offset):      def set_view_transform(self, scale, offset):
534            # width/height of the projected bbox
535            llx, lly, urx, ury = bbox = self.map.ProjectedBoundingBox()
536            pwidth = float(urx - llx)
537            pheight = float(ury - lly)
538    
539            # width/height of the window
540            wwidth, wheight = self.GetSizeTuple()
541    
542            # The window's center in projected coordinates assuming the new
543            # scale/offset
544            pcenterx = (wwidth/2 - offset[0]) / scale
545            pcentery = (offset[1] - wheight/2) / scale
546    
547            # The window coordinates used when drawing the shapes must fit
548            # into 16bit signed integers.
549            max_len = max(pwidth, pheight)
550            if max_len:
551                max_scale = 32000.0 / max_len
552            else:
553                # FIXME: What to do in this case? The bbox is effectively
554                # empty so any scale should work.
555                max_scale = scale
556    
557            # The minimal scale is somewhat arbitrarily set to half that of
558            # the bbox fit into the window
559            scales = []
560            if pwidth:
561                scales.append(wwidth / pwidth)
562            if pheight:
563                scales.append(wheight / pheight)
564            if scales:
565                min_scale = 0.5 * min(scales)
566            else:
567                min_scale = scale
568    
569            if scale > max_scale:
570                scale = max_scale
571            elif scale < min_scale:
572                scale = min_scale
573    
574          self.scale = scale          self.scale = scale
575          self.offset = offset  
576            # determine new offset to preserve the center
577            self.offset = (wwidth/2 - scale * pcenterx,
578                           wheight/2 + scale * pcentery)
579          self.full_redraw()          self.full_redraw()
580            self.issue(SCALE_CHANGED, scale)
581    
582      def proj_to_win(self, x, y):      def proj_to_win(self, x, y):
583          """\          """\
584          Return the point in  window coords given by projected coordinates x y          Return the point in  window coords given by projected coordinates x y
585          """          """
586            if self.scale == 0:
587                return (0, 0)
588    
589          offx, offy = self.offset          offx, offy = self.offset
590          return (self.scale * x + offx, -self.scale * y + offy)          return (self.scale * x + offx, -self.scale * y + offy)
591    
# Line 467  class MapCanvas(wxWindow, Publisher): Line 593  class MapCanvas(wxWindow, Publisher):
593          """\          """\
594          Return the point in projected coordinates given by window coords x y          Return the point in projected coordinates given by window coords x y
595          """          """
596            if self.scale == 0:
597                return (0, 0)
598    
599          offx, offy = self.offset          offx, offy = self.offset
600          return ((x - offx) / self.scale, (offy - y) / self.scale)          return ((x - offx) / self.scale, (offy - y) / self.scale)
601    
# Line 479  class MapCanvas(wxWindow, Publisher): Line 608  class MapCanvas(wxWindow, Publisher):
608          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
609          llx, lly, urx, ury = rect          llx, lly, urx, ury = rect
610          if llx == urx or lly == ury:          if llx == urx or lly == ury:
611              # zero with or zero height. Do Nothing              # zero width or zero height. Do Nothing
612              return              return
613          scalex = width / (urx - llx)          scalex = width / (urx - llx)
614          scaley = height / (ury - lly)          scaley = height / (ury - lly)
# Line 498  class MapCanvas(wxWindow, Publisher): Line 627  class MapCanvas(wxWindow, Publisher):
627          if bbox is not None:          if bbox is not None:
628              self.FitRectToWindow(bbox)              self.FitRectToWindow(bbox)
629    
630        def FitLayerToWindow(self, layer):
631            """Fit the given layer to the window.
632    
633            Set the scale so that the layer fits exactly into the window and
634            center it in the window.
635            """
636            
637            bbox = layer.LatLongBoundingBox()
638            if bbox is not None:
639                proj = self.map.GetProjection()
640                if proj is not None:
641                    bbox = proj.ForwardBBox(bbox)
642    
643                if bbox is not None:
644                    self.FitRectToWindow(bbox)
645    
646        def FitSelectedToWindow(self):
647            layer = self.selection.SelectedLayer()
648            shapes = self.selection.SelectedShapes()
649    
650            bbox = layer.ShapesBoundingBox(shapes)
651            if bbox is not None:
652                proj = self.map.GetProjection()
653                if proj is not None:
654                    bbox = proj.ForwardBBox(bbox)
655    
656                if bbox is not None:
657                    if len(shapes) == 1 and layer.ShapeType() == SHAPETYPE_POINT:
658                        self.ZoomFactor(1, self.proj_to_win(bbox[0], bbox[1]))
659                    else:
660                        self.FitRectToWindow(bbox)
661    
662      def ZoomFactor(self, factor, center = None):      def ZoomFactor(self, factor, center = None):
663          """Multiply the zoom by factor and center on center.          """Multiply the zoom by factor and center on center.
664    
# Line 505  class MapCanvas(wxWindow, Publisher): Line 666  class MapCanvas(wxWindow, Publisher):
666          that should be centered. If it is omitted, it defaults to the          that should be centered. If it is omitted, it defaults to the
667          center of the window          center of the window
668          """          """
669          width, height = self.GetSizeTuple()          if self.scale > 0:
670          scale = self.scale * factor              width, height = self.GetSizeTuple()
671          offx, offy = self.offset              scale = self.scale * factor
672          if center is not None:              offx, offy = self.offset
673              cx, cy = center              if center is not None:
674          else:                  cx, cy = center
675              cx = width / 2              else:
676              cy = height / 2                  cx = width / 2
677          offset = (factor * (offx - cx) + width / 2,                  cy = height / 2
678                    factor * (offy - cy) + height / 2)              offset = (factor * (offx - cx) + width / 2,
679          self.set_view_transform(scale, offset)                      factor * (offy - cy) + height / 2)
680                self.set_view_transform(scale, offset)
681    
682      def ZoomOutToRect(self, rect):      def ZoomOutToRect(self, rect):
683          """Zoom out to fit the currently visible region into rect.          """Zoom out to fit the currently visible region into rect.
# Line 561  class MapCanvas(wxWindow, Publisher): Line 723  class MapCanvas(wxWindow, Publisher):
723      def PanTool(self):      def PanTool(self):
724          """Start the pan tool"""          """Start the pan tool"""
725          self.SelectTool(PanTool(self))          self.SelectTool(PanTool(self))
726            #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)
727            #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)
728            #print bmp
729            #img = wxImageFromBitmap(bmp)
730            #print img
731            #cur = wxCursor(img)
732            #print cur
733            #self.SetCursor(cur)
734    
735      def IdentifyTool(self):      def IdentifyTool(self):
736          """Start the identify tool"""          """Start the identify tool"""
# Line 639  class MapCanvas(wxWindow, Publisher): Line 809  class MapCanvas(wxWindow, Publisher):
809          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
810          # could be reused.          # could be reused.
811          self.full_redraw()          self.full_redraw()
812            pass
813    
814      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
815          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
# Line 692  class MapCanvas(wxWindow, Publisher): Line 863  class MapCanvas(wxWindow, Publisher):
863              forward = None              forward = None
864    
865          scale = self.scale          scale = self.scale
866    
867            if scale == 0:
868                return None, None
869    
870          offx, offy = self.offset          offx, offy = self.offset
871    
872          if select_labels:          if select_labels:
# Line 741  class MapCanvas(wxWindow, Publisher): Line 916  class MapCanvas(wxWindow, Publisher):
916                  continue                  continue
917    
918              filled = layer.GetClassification().GetDefaultFill() \              filled = layer.GetClassification().GetDefaultFill() \
919                       is not Color.None                       is not Color.Transparent
920              stroked = layer.GetClassification().GetDefaultLineColor() \              stroked = layer.GetClassification().GetDefaultLineColor() \
921                        is not Color.None                        is not Color.Transparent
922    
923              layer_proj = layer.projection              layer_proj = layer.projection
924              if layer_proj is not None:              if layer_proj is not None:
# Line 884  class MapCanvas(wxWindow, Publisher): Line 1059  class MapCanvas(wxWindow, Publisher):
1059                      valign = ALIGN_CENTER                      valign = ALIGN_CENTER
1060                  label_layer.AddLabel(x, y, text,                  label_layer.AddLabel(x, y, text,
1061                                       halign = halign, valign = valign)                                       halign = halign, valign = valign)
1062    
1063    def OutputTransform(canvas_scale, canvas_offset, canvas_size, device_extend):
1064        """Calculate dimensions to transform canvas content to output device."""
1065        width, height = device_extend
1066    
1067        # Only 80 % of the with are available for the map
1068        width = width * 0.8
1069    
1070        # Define the distance of the map from DC border
1071        distance = 20
1072    
1073        if height < width:
1074            # landscape
1075            map_height = height - 2*distance
1076            map_width = map_height
1077        else:
1078            # portrait, recalibrate width (usually the legend width is too
1079            # small
1080            width = width * 0.9
1081            map_height = width - 2*distance
1082            map_width = map_height
1083        
1084        mapregion = (distance, distance,
1085                     distance+map_width, distance+map_height)
1086    
1087        canvas_width, canvas_height = canvas_size
1088        
1089        scalex = map_width / (canvas_width/canvas_scale)
1090        scaley = map_height / (canvas_height/canvas_scale)
1091        scale = min(scalex, scaley)
1092        canvas_offx, canvas_offy = canvas_offset
1093        offx = scale*canvas_offx/canvas_scale
1094        offy = scale*canvas_offy/canvas_scale
1095    
1096        return scale, (offx, offy), mapregion
Legend:
Removed from v.535  
changed lines
  Added in v.1111
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