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# Copyright (c) 2001, 2002, 2003, 2004 by Intevation GmbH |
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# Authors: |
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# Bernhard Herzog <[email protected]> |
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# Frank Koormann <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with Thuban for details. |
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|
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""" |
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Classes for display of a map and interaction with it |
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""" |
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|
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from __future__ import generators |
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|
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__version__ = "$Revision$" |
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# $Source$ |
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# $Id$ |
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|
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import os.path |
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import time |
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import traceback |
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|
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from wxPython.wx import wxWindow, \ |
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wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\ |
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EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW, \ |
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wxPlatform, wxBeginBusyCursor, wxEndBusyCursor, wxFileDialog, wxSAVE, \ |
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wxOVERWRITE_PROMPT, wxID_OK |
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|
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# Export related stuff |
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if wxPlatform == '__WXMSW__': |
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from wxPython.wx import wxMetaFileDC |
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|
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from wxPython import wx |
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|
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from Thuban import _ |
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|
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from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \ |
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LAYER_VISIBILITY_CHANGED |
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|
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from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer |
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|
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import labeldialog |
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|
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from viewport import ViewPort, PanTool, output_transform |
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|
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class CanvasPanTool(PanTool): |
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|
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"""The Canvas Pan Tool""" |
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|
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def MouseMove(self, event): |
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if self.dragging: |
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PanTool.MouseMove(self, event) |
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sx, sy = self.start |
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x, y = self.current |
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width, height = self.view.GetSizeTuple() |
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|
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bitmapdc = wx.wxMemoryDC() |
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bitmapdc.SelectObject(self.view.PreviewBitmap()) |
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|
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dc = self.view.drag_dc |
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dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y) |
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|
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class MapPrintout(wx.wxPrintout): |
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|
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""" |
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wxPrintout class for printing Thuban maps |
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""" |
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|
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def __init__(self, canvas, map, region, selected_layer, selected_shapes): |
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wx.wxPrintout.__init__(self) |
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self.canvas = canvas |
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self.map = map |
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self.region = region |
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self.selected_layer = selected_layer |
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self.selected_shapes = selected_shapes |
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|
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def GetPageInfo(self): |
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return (1, 1, 1, 1) |
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|
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def HasPage(self, pagenum): |
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return pagenum == 1 |
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|
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def OnPrintPage(self, pagenum): |
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if pagenum == 1: |
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self.draw_on_dc(self.GetDC()) |
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|
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def draw_on_dc(self, dc): |
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width, height = self.GetPageSizePixels() |
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scale, offset, mapregion = output_transform(self.canvas.scale, |
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self.canvas.offset, |
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self.canvas.GetSizeTuple(), |
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self.GetPageSizePixels()) |
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resx, resy = self.GetPPIPrinter() |
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canvas_scale = self.canvas.scale |
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x, y, width, height = self.region |
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renderer = PrinterRenderer(dc, self.map, scale, offset, |
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region = (0, 0, |
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(width/canvas_scale)*scale, |
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(height/canvas_scale)*scale), |
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resolution = resy, |
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destination_region = mapregion) |
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renderer.RenderMap(self.selected_layer, self.selected_shapes) |
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return True |
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|
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|
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class MapCanvas(wxWindow, ViewPort): |
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|
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"""A widget that displays a map and offers some interaction""" |
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|
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def __init__(self, parent, winid): |
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wxWindow.__init__(self, parent, winid) |
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ViewPort.__init__(self) |
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|
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self.SetBackgroundColour(wxColour(255, 255, 255)) |
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|
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# the bitmap serving as backing store |
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self.bitmap = None |
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# the monochrome bitmap with the selection if any |
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self.selection_bitmap = None |
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|
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self.backgroundColor = wx.wxWHITE_BRUSH |
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|
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# The rendering iterator object. Used when rendering |
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# incrementally |
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self.render_iter = None |
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|
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# subscribe the WX events we're interested in |
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EVT_PAINT(self, self.OnPaint) |
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EVT_LEFT_DOWN(self, self.OnLeftDown) |
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EVT_LEFT_UP(self, self.OnLeftUp) |
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EVT_MOTION(self, self.OnMotion) |
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EVT_LEAVE_WINDOW(self, self.OnLeaveWindow) |
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wx.EVT_SIZE(self, self.OnSize) |
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wx.EVT_IDLE(self, self.OnIdle) |
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|
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def __del__(self): |
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wxWindow.__del__(self) |
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ViewPort.__del__(self) |
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|
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def PreviewBitmap(self): |
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return self.bitmap |
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|
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def PanTool(self): |
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"""Start the canvas pan tool""" |
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self.SelectTool(CanvasPanTool(self)) |
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|
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def SetMap(self, map): |
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redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED, |
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LAYER_VISIBILITY_CHANGED) |
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if self.Map() is not None: |
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for channel in redraw_channels: |
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self.Map().Unsubscribe(channel, self.full_redraw) |
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|
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ViewPort.SetMap(self, map) |
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|
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if self.Map() is not None: |
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for channel in redraw_channels: |
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self.Map().Subscribe(channel, self.full_redraw) |
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|
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# force a redraw. If map is not empty, it's already been called |
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# by FitMapToWindow but if map is empty it hasn't been called |
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# yet so we have to explicitly call it. |
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self.full_redraw() |
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|
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def OnPaint(self, event): |
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dc = wxPaintDC(self) |
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if self.Map() is not None and self.Map().HasLayers(): |
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if self.bitmap is not None: |
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dc.BeginDrawing() |
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dc.DrawBitmap(self.bitmap, 0, 0) |
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if self.selection_bitmap is not None: |
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dc.DrawBitmap(self.selection_bitmap, 0, 0, True) |
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dc.EndDrawing() |
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else: |
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# If we've got no map or if the map is empty, simply clear |
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# the screen. |
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|
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# XXX it's probably possible to get rid of this. The |
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# background color of the window is already white and the |
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# only thing we may have to do is to call self.Refresh() |
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# with a true argument in the right places. |
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dc.BeginDrawing() |
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dc.SetBackground(self.backgroundColor) |
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dc.Clear() |
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dc.EndDrawing() |
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|
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def OnIdle(self, event): |
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"""Idle handler. Redraw the bitmap if necessary""" |
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if (self.bitmap is None |
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or self.render_iter is not None |
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or (self.HasSelectedShapes() |
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and self.selection_bitmap is None)): |
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event.RequestMore(self._do_redraw()) |
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|
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def _do_redraw(self): |
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"""Redraw a bit and return whether this method has to be called again. |
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|
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Called by OnIdle to handle the actual redraw. Redraw is |
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incremental for both the bitmap with the normal layers and the |
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bitmap with the selection. |
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""" |
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finished = False |
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if self.render_iter is not None: |
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try: |
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if self.render_iter.next(): |
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# Redraw if the last preview redraw was some time |
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# ago and the user is not currently dragging the |
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# mouse because redrawing would interfere with what |
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# the current tool is drawing on the window. |
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if not self.dragging \ |
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and time.time() - self.render_last_preview > 0.5: |
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client_dc = wxClientDC(self) |
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client_dc.BeginDrawing() |
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client_dc.DrawBitmap(self.bitmap, 0, 0) |
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client_dc.EndDrawing() |
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self.render_last_preview = time.time() |
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else: |
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self.render_iter = None |
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# Redraw if not dragging because redrawing would |
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# interfere with what the current tool is drawing on |
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# the window. |
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if not self.dragging: |
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self.redraw() |
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finished = True |
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except StopIteration: |
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finished = True |
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self.render_iter = None |
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except: |
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finished = True |
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self.render_iter = None |
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traceback.print_exc() |
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else: |
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self.render_iter = self._render_iterator() |
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self.render_last_preview = time.time() |
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return not finished |
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|
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def _render_iterator(self): |
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width, height = self.GetSizeTuple() |
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dc = wx.wxMemoryDC() |
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|
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render_start = time.time() |
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|
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if self.bitmap is None: |
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self.bitmap = wx.wxEmptyBitmap(width, height) |
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dc.SelectObject(self.bitmap) |
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dc.BeginDrawing() |
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|
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dc.SetBackground(self.backgroundColor) |
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dc.Clear() |
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|
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# draw the map into the bitmap |
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renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset, |
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(0, 0, width, height)) |
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for cont in renderer.RenderMapIncrementally(): |
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yield True |
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|
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dc.EndDrawing() |
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dc.SelectObject(wx.wxNullBitmap) |
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|
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if self.HasSelectedShapes() and self.selection_bitmap is None: |
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bitmap = wx.wxEmptyBitmap(width, height) |
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dc.SelectObject(bitmap) |
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dc.BeginDrawing() |
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dc.SetBackground(wx.wxWHITE_BRUSH) |
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dc.Clear() |
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|
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renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset, |
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(0, 0, width, height)) |
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layer = self.SelectedLayer() |
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shapes = self.selection.SelectedShapes() |
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for cont in renderer.draw_selection_incrementally(layer, shapes): |
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yield True |
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|
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dc.EndDrawing() |
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dc.SelectObject(wx.wxNullBitmap) |
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|
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bitmap.SetMask(wx.wxMaskColour(bitmap, wx.wxWHITE)) |
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self.selection_bitmap = bitmap |
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|
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yield False |
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|
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def Export(self): |
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|
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if hasattr(self, "export_path"): |
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export_path = self.export_path |
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else: |
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export_path="." |
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dlg = wxFileDialog(self, _("Export Map"), export_path, "", |
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"Enhanced Metafile (*.wmf)|*.wmf", |
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wxSAVE|wxOVERWRITE_PROMPT) |
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if dlg.ShowModal() == wxID_OK: |
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self.export_path = os.path.dirname(dlg.GetPath()) |
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dc = wxMetaFileDC(dlg.GetPath()) |
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|
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scale, offset, mapregion = output_transform(self.scale, |
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self.offset, |
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self.GetSizeTuple(), |
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dc.GetSizeTuple()) |
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|
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selected_layer = self.selection.SelectedLayer() |
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selected_shapes = self.selection.SelectedShapes() |
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|
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width, height = self.GetSizeTuple() |
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renderer = ExportRenderer(dc, self.Map(), scale, offset, |
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region = (0, 0, |
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(width/self.scale)*scale, |
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(height/self.scale)*scale), |
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destination_region = mapregion) |
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renderer.RenderMap(selected_layer, selected_shapes) |
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renderer.RenderMap(selected_layer, selected_shapes) |
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|
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dc.EndDrawing() |
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dc.Close() |
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dlg.Destroy() |
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|
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def Print(self): |
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printer = wx.wxPrinter() |
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width, height = self.GetSizeTuple() |
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selected_layer = self.selection.SelectedLayer() |
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selected_shapes = self.selection.SelectedShapes() |
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|
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printout = MapPrintout(self, self.Map(), (0, 0, width, height), |
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selected_layer, selected_shapes) |
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printer.Print(self, printout, True) |
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printout.Destroy() |
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|
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def redraw(self, *args): |
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self.Refresh(False) |
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|
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def full_redraw(self, *args): |
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self.bitmap = None |
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self.selection_bitmap = None |
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self.render_iter = None |
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self.redraw() |
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|
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def redraw_selection(self, *args): |
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self.selection_bitmap = None |
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self.render_iter = None |
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self.redraw() |
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|
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def map_projection_changed(self, map, old_proj): |
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ViewPort.map_projection_changed(self, map, old_proj) |
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self.full_redraw() |
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|
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def layer_projection_changed(self, *args): |
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ViewPort.layer_projection_changed(self, args) |
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self.full_redraw() |
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|
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def set_view_transform(self, scale, offset): |
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ViewPort.set_view_transform(self, scale, offset) |
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self.full_redraw() |
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|
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def GetPortSizeTuple(self): |
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return self.GetSizeTuple() |
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|
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def OnLeftDown(self, event): |
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self.MouseLeftDown(event) |
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if self.tool is not None: |
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self.drag_dc = wxClientDC(self) |
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self.drag_dc.SetLogicalFunction(wxINVERT) |
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self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH) |
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self.tool.Show(self.drag_dc) |
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self.CaptureMouse() |
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self.dragging = 1 |
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|
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def OnLeftUp(self, event): |
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"""Handle EVT_LEFT_UP |
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|
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Release the mouse if it was captured, if a tool is active call |
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its Hide method and call self.MouseLeftUp. |
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""" |
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# It's important that ReleaseMouse is called before MouseLeftUp. |
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# MouseLeftUp may pop up modal dialogs which leads to an |
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# effectively frozen X session because the user can only |
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# interact with the dialog but the mouse is still grabbed by the |
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# canvas. |
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if self.dragging: |
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if self.HasCapture(): |
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self.ReleaseMouse() |
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try: |
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self.tool.Hide(self.drag_dc) |
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finally: |
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self.drag_dc = None |
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self.dragging = 0 |
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self.MouseLeftUp(event) |
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|
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def OnMotion(self, event): |
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if self.dragging: |
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self.tool.Hide(self.drag_dc) |
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|
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self.MouseMove(event) |
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|
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if self.dragging: |
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self.tool.Show(self.drag_dc) |
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|
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def OnLeaveWindow(self, event): |
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self.set_current_position(None) |
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|
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def OnSize(self, event): |
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# the window's size has changed. We have to get a new bitmap. If |
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# we want to be clever we could try to get by without throwing |
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# everything away. E.g. when the window gets smaller, we could |
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# either keep the bitmap or create the new one from the old one. |
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# Even when the window becomes larger some parts of the bitmap |
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# could be reused. |
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self.full_redraw() |
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|
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def shape_selected(self, layer, shape): |
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"""Receiver for the SHAPES_SELECTED messages. Redraw the map.""" |
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# The selection object takes care that it only issues |
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# SHAPES_SELECTED messages when the set of selected shapes has |
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# actually changed, so we can do a full redraw of the |
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# selection_bitmap unconditionally. |
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ViewPort.shape_selected(self, layer, shape) |
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self.redraw_selection() |
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|
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def GetTextExtent(self, text): |
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dc = wxClientDC(self) |
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font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL) |
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dc.SetFont(font) |
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return dc.GetTextExtent(text) |
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|
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def LabelShapeAt(self, x, y, text=None): |
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"""Add or remove a label at window position x, y. |
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|
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If there's a label at the given position, remove it. Otherwise |
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determine the shape at the position, run the label dialog and |
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unless the user cancels the dialog, add a label. |
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""" |
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label_layer = self.map.LabelLayer() |
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layer, shape_index = self.find_shape_at(x, y, select_labels = 1) |
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if layer is None and shape_index is not None: |
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ViewPort.LabelShapeAt(self, x, y) |
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elif layer is not None: |
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text = labeldialog.run_label_dialog(self, |
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layer.ShapeStore().Table(), |
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shape_index) |
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ViewPort.LabelShapeAt(self, x, y, text) |
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