/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 1110 by jonathan, Fri May 30 06:30:15 2003 UTC revision 1111 by bh, Fri May 30 09:54:48 2003 UTC
# Line 531  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    
576          self.offset = offset          # 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)          self.issue(SCALE_CHANGED, scale)
581    
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