/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 296 by bh, Fri Aug 30 16:10:45 2002 UTC revision 1221 by jonathan, Tue Jun 17 15:24:45 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 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       LAYER_PROJECTION_CHANGED, \
39         MAP_LAYERS_CHANGED, LAYER_CHANGED, LAYER_VISIBILITY_CHANGED
40  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
41       SHAPETYPE_POINT       SHAPETYPE_POINT
42  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
43       ALIGN_LEFT, ALIGN_RIGHT       ALIGN_LEFT, ALIGN_RIGHT
44  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
45    from Thuban.Model.color import Color
46    
47    import resource
48    
49  from renderer import ScreenRenderer, PrinterRender  from selection import Selection
50    from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
51    
52  import labeldialog  import labeldialog
53    
54  from messages import SELECTED_SHAPE, VIEW_POSITION  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION, \
55                         SCALE_CHANGED
56    
57    
58  #  #
# Line 215  class LabelTool(Tool): Line 232  class LabelTool(Tool):
232          self.view.LabelShapeAt(event.m_x, event.m_y)          self.view.LabelShapeAt(event.m_x, event.m_y)
233    
234    
   
   
235  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.wxPrintout):
236    
237      """      """
238      wxPrintout class for printing Thuban maps      wxPrintout class for printing Thuban maps
239      """      """
240    
241      def __init__(self, map):      def __init__(self, canvas, map, region, selected_layer, selected_shapes):
242          wx.wxPrintout.__init__(self)          wx.wxPrintout.__init__(self)
243            self.canvas = canvas
244          self.map = map          self.map = map
245            self.region = region
246            self.selected_layer = selected_layer
247            self.selected_shapes = selected_shapes
248    
249      def GetPageInfo(self):      def GetPageInfo(self):
250          return (1, 1, 1, 1)          return (1, 1, 1, 1)
# Line 239  class MapPrintout(wx.wxPrintout): Line 258  class MapPrintout(wx.wxPrintout):
258    
259      def draw_on_dc(self, dc):      def draw_on_dc(self, dc):
260          width, height = self.GetPageSizePixels()          width, height = self.GetPageSizePixels()
261          llx, lly, urx, ury = self.map.ProjectedBoundingBox()          scale, offset, mapregion = OutputTransform(self.canvas.scale,
262          scalex = width / (urx - llx)                                                     self.canvas.offset,
263          scaley = height / (ury - lly)                                                     self.canvas.GetSizeTuple(),
264          scale = min(scalex, scaley)                                                     self.GetPageSizePixels())
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
   
265          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
266          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          renderer = PrinterRenderer(dc, scale, offset, resolution = resy)
267          renderer.RenderMap(self.map)          x, y, width, height = self.region
268          return wx.true          canvas_scale = self.canvas.scale
269            renderer.RenderMap(self.map,
270                               (0,0,
271                                    (width/canvas_scale)*scale,
272                                    (height/canvas_scale)*scale),
273                                    mapregion,
274                               self.selected_layer, self.selected_shapes)
275            return True
276    
277    
278  class MapCanvas(wxWindow, Publisher):  class MapCanvas(wxWindow, Publisher):
279    
280      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
281    
282      def __init__(self, parent, winid, interactor):      # Some messages that can be subscribed/unsubscribed directly through
283        # the MapCanvas come in fact from other objects. This is a dict
284        # mapping those messages to the names of the instance variables they
285        # actually come from. The delegation is implemented in the Subscribe
286        # and Unsubscribe methods
287        delegated_messages = {LAYER_SELECTED: "selection",
288                              SHAPES_SELECTED: "selection"}
289    
290        # Methods delegated to some instance variables. The delegation is
291        # implemented in the __getattr__ method.
292        delegated_methods = {"SelectLayer": "selection",
293                             "SelectShapes": "selection",
294                             "SelectedLayer": "selection",
295                             "HasSelectedLayer": "selection",
296                             "HasSelectedShapes": "selection",
297                             "SelectedShapes": "selection"}
298    
299        def __init__(self, parent, winid):
300          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
301          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
302    
303          # the map displayed in this canvas. Set with SetMap()          # the map displayed in this canvas. Set with SetMap()
304          self.map = None          self.map = None
305    
306            # current map projection. should only differ from map.projection
307            # when the map's projection is changing and we need access to the
308            # old projection.
309            self.current_map_proj = None
310    
311          # scale and offset describe the transformation from projected          # scale and offset describe the transformation from projected
312          # coordinates to window coordinates.          # coordinates to window coordinates.
313          self.scale = 1.0          self.scale = 1.0
# Line 279  class MapCanvas(wxWindow, Publisher): Line 324  class MapCanvas(wxWindow, Publisher):
324          # if the mouse is outside the window.          # if the mouse is outside the window.
325          self.current_position = None          self.current_position = None
326    
         # If true, OnIdle will call do_redraw to do the actual  
         # redrawing. Set by OnPaint to avoid some unnecessary redraws.  
         # To force a redraw call full_redraw().  
         self.redraw_on_idle = 0  
   
327          # the bitmap serving as backing store          # the bitmap serving as backing store
328          self.bitmap = None          self.bitmap = None
329    
330          # the interactor          # the selection
331          self.interactor = interactor          self.selection = Selection()
332          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)
333    
334          # keep track of which layers/shapes are selected to make sure we          # keep track of which layers/shapes are selected to make sure we
335          # only redraw when necessary          # only redraw when necessary
# Line 303  class MapCanvas(wxWindow, Publisher): Line 343  class MapCanvas(wxWindow, Publisher):
343          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
344          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
345          wx.EVT_SIZE(self, self.OnSize)          wx.EVT_SIZE(self, self.OnSize)
         wx.EVT_IDLE(self, self.OnIdle)  
346    
347      def __del__(self):      def __del__(self):
348          wxWindow.__del__(self)          wxWindow.__del__(self)
349          Publisher.__del__(self)          Publisher.__del__(self)
350    
351        def Subscribe(self, channel, *args):
352            """Extend the inherited method to handle delegated messages.
353    
354            If channel is one of the delegated messages call the appropriate
355            object's Subscribe method. Otherwise just call the inherited
356            method.
357            """
358            if channel in self.delegated_messages:
359                object = getattr(self, self.delegated_messages[channel])
360                object.Subscribe(channel, *args)
361            else:
362                Publisher.Subscribe(self, channel, *args)
363    
364        def Unsubscribe(self, channel, *args):
365            """Extend the inherited method to handle delegated messages.
366    
367            If channel is one of the delegated messages call the appropriate
368            object's Unsubscribe method. Otherwise just call the inherited
369            method.
370            """
371            if channel in self.delegated_messages:
372                object = getattr(self, self.delegated_messages[channel])
373                object.Unsubscribe(channel, *args)
374            else:
375                Publisher.Unsubscribe(self, channel, *args)
376    
377        def __getattr__(self, attr):
378            if attr in self.delegated_methods:
379                return getattr(getattr(self, self.delegated_methods[attr]), attr)
380            raise AttributeError(attr)
381    
382      def OnPaint(self, event):      def OnPaint(self, event):
383          dc = wxPaintDC(self)          dc = wxPaintDC(self)
384          if self.map is not None and self.map.HasLayers():          clear = self.map is None or not self.map.HasLayers()
385              # We have a non-empty map. Redraw it in idle time  
386              self.redraw_on_idle = 1          wxBeginBusyCursor()
387          else:          try:
388              # If we've got no map or if the map is empty, simply clear              if not clear:
389              # the screen.                  self.do_redraw()
390                    try:
391              # XXX it's probably possible to get rid of this. The                      pass
392              # background color of the window is already white and the                  except:
393              # only thing we may have to do is to call self.Refresh()                      print "Error during drawing:", sys.exc_info()[0]
394              # with a true argument in the right places.                      clear = True
395              dc.BeginDrawing()  
396              dc.Clear()              if clear:
397              dc.EndDrawing()                  # If we've got no map or if the map is empty, simply clear
398                    # the screen.
399    
400                    # XXX it's probably possible to get rid of this. The
401                    # background color of the window is already white and the
402                    # only thing we may have to do is to call self.Refresh()
403                    # with a true argument in the right places.
404                    dc.BeginDrawing()
405                    dc.Clear()
406                    dc.EndDrawing()
407            finally:
408                wxEndBusyCursor()
409    
410      def do_redraw(self):      def do_redraw(self):
411          # 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 342  class MapCanvas(wxWindow, Publisher): Line 423  class MapCanvas(wxWindow, Publisher):
423              dc.BeginDrawing()              dc.BeginDrawing()
424    
425              # clear the background              # clear the background
426              dc.SetBrush(wx.wxWHITE_BRUSH)              #dc.SetBrush(wx.wxWHITE_BRUSH)
427              dc.SetPen(wx.wxTRANSPARENT_PEN)              #dc.SetPen(wx.wxTRANSPARENT_PEN)
428              dc.DrawRectangle(0, 0, width, height)              #dc.DrawRectangle(0, 0, width, height)
429                dc.SetBackground(wx.wxWHITE_BRUSH)
430              if 1: #self.interactor.selected_map is self.map:              dc.Clear()
431                  selected_layer = self.interactor.selected_layer  
432                  selected_shape = self.interactor.selected_shape              selected_layer = self.selection.SelectedLayer()
433              else:              selected_shapes = self.selection.SelectedShapes()
                 selected_layer = None  
                 selected_shape = None  
434    
435              # draw the map into the bitmap              # draw the map into the bitmap
436              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.scale, self.offset)
# Line 359  class MapCanvas(wxWindow, Publisher): Line 438  class MapCanvas(wxWindow, Publisher):
438              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
439              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
440              renderer.RenderMap(self.map, (0, 0, width, height),              renderer.RenderMap(self.map, (0, 0, width, height),
441                                 selected_layer, selected_shape)                                 selected_layer, selected_shapes)
442    
443              dc.EndDrawing()              dc.EndDrawing()
444              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
# Line 373  class MapCanvas(wxWindow, Publisher): Line 452  class MapCanvas(wxWindow, Publisher):
452          clientdc.Blit(0, 0, width, height, dc, 0, 0)          clientdc.Blit(0, 0, width, height, dc, 0, 0)
453          clientdc.EndDrawing()          clientdc.EndDrawing()
454    
455        def Export(self):
456            if self.scale == 0:
457                return
458    
459            if hasattr(self, "export_path"):
460                export_path = self.export_path
461            else:
462                export_path="."
463            dlg = wxFileDialog(self, _("Export Map"), export_path, "",
464                               "Enhanced Metafile (*.wmf)|*.wmf",
465                               wxSAVE|wxOVERWRITE_PROMPT)
466            if dlg.ShowModal() == wxID_OK:
467                self.export_path = os.path.dirname(dlg.GetPath())
468                dc = wxMetaFileDC(dlg.GetPath())
469        
470                scale, offset, mapregion = OutputTransform(self.scale,
471                                                           self.offset,
472                                                           self.GetSizeTuple(),
473                                                           dc.GetSizeTuple())
474    
475                selected_layer = self.selection.SelectedLayer()
476                selected_shapes = self.selection.SelectedShapes()
477    
478                renderer = ExportRenderer(dc, scale, offset)
479    
480                # Pass the entire bitmap as update region to the renderer.
481                # We're redrawing the whole bitmap, after all.
482                width, height = self.GetSizeTuple()
483                renderer.RenderMap(self.map,
484                                    (0,0,
485                                        (width/self.scale)*scale,
486                                        (height/self.scale)*scale),
487                                    mapregion,
488                                    selected_layer, selected_shapes)
489                dc.EndDrawing()
490                dc.Close()
491            dlg.Destroy()
492            
493      def Print(self):      def Print(self):
494          printer = wx.wxPrinter()          printer = wx.wxPrinter()
495          printout = MapPrintout(self.map)          width, height = self.GetSizeTuple()
496          printer.Print(self, printout, wx.true)          selected_layer = self.selection.SelectedLayer()
497            selected_shapes = self.selection.SelectedShapes()
498            
499            printout = MapPrintout(self, self.map, (0, 0, width, height),
500                                   selected_layer, selected_shapes)
501            printer.Print(self, printout, True)
502          printout.Destroy()          printout.Destroy()
503    
504      def SetMap(self, map):      def SetMap(self, map):
505          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
506                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
507          if self.map is not None:          if self.map is not None:
508              for channel in redraw_channels:              for channel in redraw_channels:
509                  self.map.Unsubscribe(channel, self.full_redraw)                  self.map.Unsubscribe(channel, self.full_redraw)
510              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
511                                   self.projection_changed)                                   self.map_projection_changed)
512                self.map.Unsubscribe(LAYER_PROJECTION_CHANGED,
513                                     self.layer_projection_changed)
514          self.map = map          self.map = map
515            self.current_map_proj = self.map.GetProjection()
516            self.selection.ClearSelection()
517          if self.map is not None:          if self.map is not None:
518              for channel in redraw_channels:              for channel in redraw_channels:
519                  self.map.Subscribe(channel, self.full_redraw)                  self.map.Subscribe(channel, self.full_redraw)
520              self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)              self.map.Subscribe(MAP_PROJECTION_CHANGED, self.map_projection_changed)
521                self.map.Subscribe(LAYER_PROJECTION_CHANGED, self.layer_projection_changed)
522          self.FitMapToWindow()          self.FitMapToWindow()
523          # force a redraw. If map is not empty, it's already been called          # force a redraw. If map is not empty, it's already been called
524          # by FitMapToWindow but if map is empty it hasn't been called          # by FitMapToWindow but if map is empty it hasn't been called
# Line 409  class MapCanvas(wxWindow, Publisher): Line 536  class MapCanvas(wxWindow, Publisher):
536          self.bitmap = None          self.bitmap = None
537          self.redraw()          self.redraw()
538    
539      def projection_changed(self, *args):      def map_projection_changed(self, *args):
540          self.FitMapToWindow()  
541            proj = self.current_map_proj
542            self.current_map_proj = self.map.GetProjection()
543    
544            bbox = None
545    
546            if proj is not None and self.current_map_proj is not None:
547                width, height = self.GetSizeTuple()
548                llx, lly = self.win_to_proj(0, height)
549                urx, ury = self.win_to_proj(width, 0)
550                bbox = proj.Inverse(llx, lly) + proj.Inverse(urx, ury)
551                bbox = self.current_map_proj.ForwardBBox(bbox)
552    
553            if bbox is not None:
554                self.FitRectToWindow(bbox)
555            else:
556                self.FitMapToWindow()
557    
558            self.full_redraw()
559    
560        def layer_projection_changed(self, *args):
561          self.full_redraw()          self.full_redraw()
562    
563      def set_view_transform(self, scale, offset):      def set_view_transform(self, scale, offset):
564            # width/height of the projected bbox
565            llx, lly, urx, ury = bbox = self.map.ProjectedBoundingBox()
566            pwidth = float(urx - llx)
567            pheight = float(ury - lly)
568    
569            # width/height of the window
570            wwidth, wheight = self.GetSizeTuple()
571    
572            # The window's center in projected coordinates assuming the new
573            # scale/offset
574            pcenterx = (wwidth/2 - offset[0]) / scale
575            pcentery = (offset[1] - wheight/2) / scale
576    
577            # The window coordinates used when drawing the shapes must fit
578            # into 16bit signed integers.
579            max_len = max(pwidth, pheight)
580            if max_len:
581                max_scale = 32000.0 / max_len
582            else:
583                # FIXME: What to do in this case? The bbox is effectively
584                # empty so any scale should work.
585                max_scale = scale
586    
587            # The minimal scale is somewhat arbitrarily set to half that of
588            # the bbox fit into the window
589            scales = []
590            if pwidth:
591                scales.append(wwidth / pwidth)
592            if pheight:
593                scales.append(wheight / pheight)
594            if scales:
595                min_scale = 0.5 * min(scales)
596            else:
597                min_scale = scale
598    
599            if scale > max_scale:
600                scale = max_scale
601            elif scale < min_scale:
602                scale = min_scale
603    
604          self.scale = scale          self.scale = scale
605          self.offset = offset  
606            # determine new offset to preserve the center
607            self.offset = (wwidth/2 - scale * pcenterx,
608                           wheight/2 + scale * pcentery)
609          self.full_redraw()          self.full_redraw()
610            self.issue(SCALE_CHANGED, scale)
611    
612      def proj_to_win(self, x, y):      def proj_to_win(self, x, y):
613          """\          """\
614          Return the point in  window coords given by projected coordinates x y          Return the point in  window coords given by projected coordinates x y
615          """          """
616            if self.scale == 0:
617                return (0, 0)
618    
619          offx, offy = self.offset          offx, offy = self.offset
620          return (self.scale * x + offx, -self.scale * y + offy)          return (self.scale * x + offx, -self.scale * y + offy)
621    
# Line 429  class MapCanvas(wxWindow, Publisher): Line 623  class MapCanvas(wxWindow, Publisher):
623          """\          """\
624          Return the point in projected coordinates given by window coords x y          Return the point in projected coordinates given by window coords x y
625          """          """
626            if self.scale == 0:
627                return (0, 0)
628    
629          offx, offy = self.offset          offx, offy = self.offset
630          return ((x - offx) / self.scale, (offy - y) / self.scale)          return ((x - offx) / self.scale, (offy - y) / self.scale)
631    
632      def FitRectToWindow(self, rect):      def FitRectToWindow(self, rect):
633          """Fit the rectangular region given by rect into the window.          """Fit the rectangular region given by rect into the window.
634            
635          Set scale so that rect (in projected coordinates) just fits into          Set scale so that rect (in projected coordinates) just fits into
636          the window and center it.          the window and center it.
637          """          """
638          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
639          llx, lly, urx, ury = rect          llx, lly, urx, ury = rect
640          if llx == urx or lly == ury:          if llx == urx or lly == ury:
641              # zero with or zero height. Do Nothing              # zero width or zero height. Do Nothing
642              return              return
643          scalex = width / (urx - llx)          scalex = width / (urx - llx)
644          scaley = height / (ury - lly)          scaley = height / (ury - lly)
# Line 452  class MapCanvas(wxWindow, Publisher): Line 649  class MapCanvas(wxWindow, Publisher):
649    
650      def FitMapToWindow(self):      def FitMapToWindow(self):
651          """Fit the map to the window          """Fit the map to the window
652            
653          Set the scale so that the map fits exactly into the window and          Set the scale so that the map fits exactly into the window and
654          center it in the window.          center it in the window.
655          """          """
# Line 460  class MapCanvas(wxWindow, Publisher): Line 657  class MapCanvas(wxWindow, Publisher):
657          if bbox is not None:          if bbox is not None:
658              self.FitRectToWindow(bbox)              self.FitRectToWindow(bbox)
659    
660        def FitLayerToWindow(self, layer):
661            """Fit the given layer to the window.
662    
663            Set the scale so that the layer fits exactly into the window and
664            center it in the window.
665            """
666            
667            bbox = layer.LatLongBoundingBox()
668            if bbox is not None:
669                proj = self.map.GetProjection()
670                if proj is not None:
671                    bbox = proj.ForwardBBox(bbox)
672    
673                if bbox is not None:
674                    self.FitRectToWindow(bbox)
675    
676        def FitSelectedToWindow(self):
677            layer = self.selection.SelectedLayer()
678            shapes = self.selection.SelectedShapes()
679    
680            bbox = layer.ShapesBoundingBox(shapes)
681            if bbox is not None:
682                proj = self.map.GetProjection()
683                if proj is not None:
684                    bbox = proj.ForwardBBox(bbox)
685    
686                if bbox is not None:
687                    if len(shapes) == 1 and layer.ShapeType() == SHAPETYPE_POINT:
688                        self.ZoomFactor(1, self.proj_to_win(bbox[0], bbox[1]))
689                    else:
690                        self.FitRectToWindow(bbox)
691    
692      def ZoomFactor(self, factor, center = None):      def ZoomFactor(self, factor, center = None):
693          """Multiply the zoom by factor and center on center.          """Multiply the zoom by factor and center on center.
694    
# Line 467  class MapCanvas(wxWindow, Publisher): Line 696  class MapCanvas(wxWindow, Publisher):
696          that should be centered. If it is omitted, it defaults to the          that should be centered. If it is omitted, it defaults to the
697          center of the window          center of the window
698          """          """
699          width, height = self.GetSizeTuple()          if self.scale > 0:
700          scale = self.scale * factor              width, height = self.GetSizeTuple()
701          offx, offy = self.offset              scale = self.scale * factor
702          if center is not None:              offx, offy = self.offset
703              cx, cy = center              if center is not None:
704          else:                  cx, cy = center
705              cx = width / 2              else:
706              cy = height / 2                  cx = width / 2
707          offset = (factor * (offx - cx) + width / 2,                  cy = height / 2
708                    factor * (offy - cy) + height / 2)              offset = (factor * (offx - cx) + width / 2,
709          self.set_view_transform(scale, offset)                      factor * (offy - cy) + height / 2)
710                self.set_view_transform(scale, offset)
711    
712      def ZoomOutToRect(self, rect):      def ZoomOutToRect(self, rect):
713          """Zoom out to fit the currently visible region into rect.          """Zoom out to fit the currently visible region into rect.
# Line 504  class MapCanvas(wxWindow, Publisher): Line 734  class MapCanvas(wxWindow, Publisher):
734          offx, offy = self.offset          offx, offy = self.offset
735          self.set_view_transform(self.scale, (offx + dx, offy + dy))          self.set_view_transform(self.scale, (offx + dx, offy + dy))
736    
737        def SelectTool(self, tool):
738            """Make tool the active tool.
739    
740            The parameter should be an instance of Tool or None to indicate
741            that no tool is active.
742            """
743            self.tool = tool
744    
745      def ZoomInTool(self):      def ZoomInTool(self):
746          """Start the zoom in tool"""          """Start the zoom in tool"""
747          self.tool = ZoomInTool(self)          self.SelectTool(ZoomInTool(self))
748    
749      def ZoomOutTool(self):      def ZoomOutTool(self):
750          """Start the zoom out tool"""          """Start the zoom out tool"""
751          self.tool = ZoomOutTool(self)          self.SelectTool(ZoomOutTool(self))
752    
753      def PanTool(self):      def PanTool(self):
754          """Start the pan tool"""          """Start the pan tool"""
755          self.tool = PanTool(self)          self.SelectTool(PanTool(self))
756            #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)
757            #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)
758            #print bmp
759            #img = wxImageFromBitmap(bmp)
760            #print img
761            #cur = wxCursor(img)
762            #print cur
763            #self.SetCursor(cur)
764    
765      def IdentifyTool(self):      def IdentifyTool(self):
766          """Start the identify tool"""          """Start the identify tool"""
767          self.tool = IdentifyTool(self)          self.SelectTool(IdentifyTool(self))
768    
769      def LabelTool(self):      def LabelTool(self):
770          """Start the label tool"""          """Start the label tool"""
771          self.tool = LabelTool(self)          self.SelectTool(LabelTool(self))
772    
773      def CurrentTool(self):      def CurrentTool(self):
774          """Return the name of the current tool or None if no tool is active"""          """Return the name of the current tool or None if no tool is active"""
# Line 568  class MapCanvas(wxWindow, Publisher): Line 814  class MapCanvas(wxWindow, Publisher):
814          self.set_current_position(event)          self.set_current_position(event)
815          if self.dragging:          if self.dragging:
816              self.ReleaseMouse()              self.ReleaseMouse()
817              self.tool.Hide(self.drag_dc)              try:
818              self.tool.MouseUp(event)                  self.tool.Hide(self.drag_dc)
819              self.drag_dc = None                  self.tool.MouseUp(event)
820          self.dragging = 0              finally:
821                    self.drag_dc = None
822                    self.dragging = 0
823    
824      def OnMotion(self, event):      def OnMotion(self, event):
825          self.set_current_position(event)          self.set_current_position(event)
# Line 583  class MapCanvas(wxWindow, Publisher): Line 831  class MapCanvas(wxWindow, Publisher):
831      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
832          self.set_current_position(None)          self.set_current_position(None)
833    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
834      def OnSize(self, event):      def OnSize(self, event):
835          # the window's size has changed. We have to get a new bitmap. If          # the window's size has changed. We have to get a new bitmap. If
836          # we want to be clever we could try to get by without throwing          # we want to be clever we could try to get by without throwing
# Line 596  class MapCanvas(wxWindow, Publisher): Line 839  class MapCanvas(wxWindow, Publisher):
839          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
840          # could be reused.          # could be reused.
841          self.full_redraw()          self.full_redraw()
842            pass
843    
844      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
845          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
846            # The selection object takes care that it only issues
847          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
848          when necessary.          # actually changed, so we can do a full redraw unconditionally.
849          """          # FIXME: We should perhaps try to limit the redraw to the are
850          # A redraw is necessary when the display has to change, which          # actually covered by the shapes before and after the selection
851          # means that either the status changes from having no selection          # change.
852          # to having a selection shape or vice versa, or when the fact          self.full_redraw()
         # whether there is a selection at all doesn't change, when the  
         # shape which is selected has changed (which means that layer or  
         # shapeid changes).  
         if ((shape is not None or self.last_selected_shape is not None)  
             and (shape != self.last_selected_shape  
                  or layer != self.last_selected_layer)):  
             self.full_redraw()  
   
         # remember the selection so we can compare when it changes again.  
         self.last_selected_layer = layer  
         self.last_selected_shape = shape  
853    
854      def unprojected_rect_around_point(self, x, y):      def unprojected_rect_around_point(self, x, y, dist):
855          """return a rect a few pixels around (x, y) in unprojected corrdinates          """return a rect dist pixels around (x, y) in unprojected corrdinates
856    
857          The return value is a tuple (minx, miny, maxx, maxy) suitable a          The return value is a tuple (minx, miny, maxx, maxy) suitable a
858          parameter to a layer's ShapesInRegion method.          parameter to a layer's ShapesInRegion method.
# Line 633  class MapCanvas(wxWindow, Publisher): Line 866  class MapCanvas(wxWindow, Publisher):
866          xs = []          xs = []
867          ys = []          ys = []
868          for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):          for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):
869              px, py = self.win_to_proj(x + dx, y + dy)              px, py = self.win_to_proj(x + dist * dx, y + dist * dy)
870              if inverse:              if inverse:
871                  px, py = inverse(px, py)                  px, py = inverse(px, py)
872              xs.append(px)              xs.append(px)
# Line 660  class MapCanvas(wxWindow, Publisher): Line 893  class MapCanvas(wxWindow, Publisher):
893              forward = None              forward = None
894    
895          scale = self.scale          scale = self.scale
         offx, offy = self.offset  
896    
897          box = self.unprojected_rect_around_point(px, py)          if scale == 0:
898                return None, None
899    
900            offx, offy = self.offset
901    
902          if select_labels:          if select_labels:
903              labels = self.map.LabelLayer().Labels()              labels = self.map.LabelLayer().Labels()
# Line 710  class MapCanvas(wxWindow, Publisher): Line 945  class MapCanvas(wxWindow, Publisher):
945              if not layer.Visible():              if not layer.Visible():
946                  continue                  continue
947    
948              filled = layer.fill is not None              filled = layer.GetClassification().GetDefaultFill() \
949              stroked = layer.stroke is not None                       is not Color.Transparent
950                stroked = layer.GetClassification().GetDefaultLineColor() \
951                          is not Color.Transparent
952    
953              layer_proj = layer.projection              layer_proj = layer.projection
954              if layer_proj is not None:              if layer_proj is not None:
# Line 723  class MapCanvas(wxWindow, Publisher): Line 960  class MapCanvas(wxWindow, Publisher):
960    
961              select_shape = -1              select_shape = -1
962    
963                # Determine the ids of the shapes that overlap a tiny area
964                # around the point. For layers containing points we have to
965                # choose a larger size of the box we're testing agains so
966                # that we take the size of the markers into account
967                # FIXME: Once the markers are more flexible this part has to
968                # become more flexible too, of course
969                if shapetype == SHAPETYPE_POINT:
970                    box = self.unprojected_rect_around_point(px, py, 5)
971                else:
972                    box = self.unprojected_rect_around_point(px, py, 1)
973              shape_ids = layer.ShapesInRegion(box)              shape_ids = layer.ShapesInRegion(box)
974              shape_ids.reverse()              shape_ids.reverse()
975    
976              if shapetype == SHAPETYPE_POLYGON:              if shapetype == SHAPETYPE_POLYGON:
977                  for i in shape_ids:                  for i in shape_ids:
978                      result = point_in_polygon_shape(layer.shapefile.cobject(),                      shapefile = layer.ShapeStore().Shapefile().cobject()
979                                                      i,                      result = point_in_polygon_shape(shapefile, i,
980                                                      filled, stroked,                                                      filled, stroked,
981                                                      map_proj, layer_proj,                                                      map_proj, layer_proj,
982                                                      scale, -scale, offx, offy,                                                      scale, -scale, offx, offy,
# Line 739  class MapCanvas(wxWindow, Publisher): Line 986  class MapCanvas(wxWindow, Publisher):
986                          break                          break
987              elif shapetype == SHAPETYPE_ARC:              elif shapetype == SHAPETYPE_ARC:
988                  for i in shape_ids:                  for i in shape_ids:
989                      result = point_in_polygon_shape(layer.shapefile.cobject(),                      shapefile = layer.ShapeStore().Shapefile().cobject()
990                        result = point_in_polygon_shape(shapefile,
991                                                      i, 0, 1,                                                      i, 0, 1,
992                                                      map_proj, layer_proj,                                                      map_proj, layer_proj,
993                                                      scale, -scale, offx, offy,                                                      scale, -scale, offx, offy,
# Line 780  class MapCanvas(wxWindow, Publisher): Line 1028  class MapCanvas(wxWindow, Publisher):
1028          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
1029          # the already selected layer again.          # the already selected layer again.
1030          if layer is None:          if layer is None:
1031              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
1032          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
1033            else:
1034                shapes = [shape]
1035            self.selection.SelectShapes(layer, shapes)
1036          return result          return result
1037    
1038      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
# Line 798  class MapCanvas(wxWindow, Publisher): Line 1049  class MapCanvas(wxWindow, Publisher):
1049              # a label was selected              # a label was selected
1050              label_layer.RemoveLabel(shape_index)              label_layer.RemoveLabel(shape_index)
1051          elif layer is not None:          elif layer is not None:
1052              text = labeldialog.run_label_dialog(self, layer.table, shape_index)              text = labeldialog.run_label_dialog(self,
1053                                                    layer.ShapeStore().Table(),
1054                                                    shape_index)
1055              if text:              if text:
1056                  proj = self.map.projection                  proj = self.map.projection
1057                  if proj is not None:                  if proj is not None:
# Line 813  class MapCanvas(wxWindow, Publisher): Line 1066  class MapCanvas(wxWindow, Publisher):
1066    
1067                  shapetype = layer.ShapeType()                  shapetype = layer.ShapeType()
1068                  if shapetype == SHAPETYPE_POLYGON:                  if shapetype == SHAPETYPE_POLYGON:
1069                      x, y = shape_centroid(layer.shapefile.cobject(),                      shapefile = layer.ShapeStore().Shapefile().cobject()
1070                                            shape_index,                      x, y = shape_centroid(shapefile, shape_index,
1071                                            map_proj, layer_proj, 1, 1, 0, 0)                                            map_proj, layer_proj, 1, 1, 0, 0)
1072                      if map_proj is not None:                      if map_proj is not None:
1073                          x, y = map_proj.Inverse(x, y)                          x, y = map_proj.Inverse(x, y)
# Line 839  class MapCanvas(wxWindow, Publisher): Line 1092  class MapCanvas(wxWindow, Publisher):
1092                      valign = ALIGN_CENTER                      valign = ALIGN_CENTER
1093                  label_layer.AddLabel(x, y, text,                  label_layer.AddLabel(x, y, text,
1094                                       halign = halign, valign = valign)                                       halign = halign, valign = valign)
1095    
1096    def OutputTransform(canvas_scale, canvas_offset, canvas_size, device_extend):
1097        """Calculate dimensions to transform canvas content to output device."""
1098        width, height = device_extend
1099    
1100        # Only 80 % of the with are available for the map
1101        width = width * 0.8
1102    
1103        # Define the distance of the map from DC border
1104        distance = 20
1105    
1106        if height < width:
1107            # landscape
1108            map_height = height - 2*distance
1109            map_width = map_height
1110        else:
1111            # portrait, recalibrate width (usually the legend width is too
1112            # small
1113            width = width * 0.9
1114            map_height = width - 2*distance
1115            map_width = map_height
1116        
1117        mapregion = (distance, distance,
1118                     distance+map_width, distance+map_height)
1119    
1120        canvas_width, canvas_height = canvas_size
1121        
1122        scalex = map_width / (canvas_width/canvas_scale)
1123        scaley = map_height / (canvas_height/canvas_scale)
1124        scale = min(scalex, scaley)
1125        canvas_offx, canvas_offy = canvas_offset
1126        offx = scale*canvas_offx/canvas_scale
1127        offy = scale*canvas_offy/canvas_scale
1128    
1129        return scale, (offx, offy), mapregion

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