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# Copyright (c) 2001 by Intevation GmbH |
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# Authors: |
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# Bernhard Herzog <[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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__version__ = "$Revision$" |
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|
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from math import hypot |
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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 |
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|
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|
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from wxPython import wx |
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|
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from wxproj import point_in_polygon_shape, shape_centroid |
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|
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|
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from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \ |
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LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED |
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from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \ |
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SHAPETYPE_POINT |
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from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \ |
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ALIGN_LEFT, ALIGN_RIGHT |
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|
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|
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from renderer import ScreenRenderer, PrinterRender |
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|
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import labeldialog |
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|
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from messages import SELECTED_SHAPE |
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|
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|
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# |
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# The tools |
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# |
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|
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class Tool: |
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|
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""" |
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Base class for the interactive tools |
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""" |
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|
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def __init__(self, view): |
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"""Intitialize the tool. The view is the canvas displaying the map""" |
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self.view = view |
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self.start = self.current = None |
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self.dragging = 0 |
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self.drawn = 0 |
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|
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def Name(self): |
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"""Return the tool's name""" |
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return '' |
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|
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def drag_start(self, x, y): |
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self.start = self.current = x, y |
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self.dragging = 1 |
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|
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def drag_move(self, x, y): |
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self.current = x, y |
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|
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def drag_stop(self, x, y): |
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self.current = x, y |
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self.dragging = 0 |
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|
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def Show(self, dc): |
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if not self.drawn: |
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self.draw(dc) |
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self.drawn = 1 |
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|
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def Hide(self, dc): |
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if self.drawn: |
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self.draw(dc) |
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self.drawn = 0 |
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|
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def draw(self, dc): |
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pass |
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|
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def MouseDown(self, event): |
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self.drag_start(event.m_x, event.m_y) |
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|
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def MouseMove(self, event): |
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if self.dragging: |
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self.drag_move(event.m_x, event.m_y) |
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|
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def MouseUp(self, event): |
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if self.dragging: |
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self.drag_move(event.m_x, event.m_y) |
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|
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def Cancel(self): |
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self.dragging = 0 |
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|
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|
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class RectTool(Tool): |
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|
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"""Base class for tools that draw rectangles while dragging""" |
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|
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def draw(self, dc): |
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sx, sy = self.start |
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cx, cy = self.current |
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dc.DrawRectangle(sx, sy, cx - sx, cy - sy) |
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|
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class ZoomInTool(RectTool): |
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|
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"""The Zoom-In Tool""" |
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|
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def Name(self): |
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return "ZoomInTool" |
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|
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def proj_rect(self): |
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"""return the rectangle given by start and current in projected |
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coordinates""" |
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sx, sy = self.start |
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cx, cy = self.current |
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left, top = self.view.win_to_proj(sx, sy) |
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right, bottom = self.view.win_to_proj(cx, cy) |
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return (min(left, right), min(top, bottom), |
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max(left, right), max(top, bottom)) |
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|
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def MouseUp(self, event): |
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if self.dragging: |
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Tool.MouseUp(self, event) |
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self.view.FitRectToWindow(self.proj_rect()) |
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|
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|
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class ZoomOutTool(RectTool): |
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|
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"""The Zoom-Out Tool""" |
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|
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def Name(self): |
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return "ZoomOutTool" |
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|
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def MouseUp(self, event): |
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if self.dragging: |
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Tool.MouseUp(self, event) |
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sx, sy = self.start |
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cx, cy = self.current |
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self.view.ZoomOutToRect((min(sx, cx), min(sy, cy), |
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max(sx, cx), max(sy, cy))) |
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|
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|
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class PanTool(Tool): |
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|
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"""The Pan Tool""" |
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|
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def Name(self): |
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return "PanTool" |
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|
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def MouseMove(self, event): |
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if self.dragging: |
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x0, y0 = self.current |
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Tool.MouseMove(self, event) |
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x, y = self.current |
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width, height = self.view.GetSizeTuple() |
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dc = self.view.drag_dc |
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dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y) |
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|
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def MouseUp(self, event): |
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if self.dragging: |
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Tool.MouseUp(self, event) |
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sx, sy = self.start |
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cx, cy = self.current |
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self.view.Translate(cx - sx, cy - sy) |
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|
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class IdentifyTool(Tool): |
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|
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"""The "Identify" Tool""" |
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|
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def Name(self): |
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return "IdentifyTool" |
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|
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def MouseUp(self, event): |
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self.view.SelectShapeAt(event.m_x, event.m_y) |
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|
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|
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class LabelTool(Tool): |
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|
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"""The "Label" Tool""" |
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|
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def Name(self): |
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return "LabelTool" |
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|
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def MouseUp(self, event): |
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self.view.LabelShapeAt(event.m_x, event.m_y) |
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|
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|
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|
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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, map): |
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wx.wxPrintout.__init__(self) |
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self.map = map |
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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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llx, lly, urx, ury = self.map.ProjectedBoundingBox() |
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scalex = width / (urx - llx) |
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scaley = height / (ury - lly) |
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scale = min(scalex, scaley) |
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offx = 0.5 * (width - (urx + llx) * scale) |
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offy = 0.5 * (height + (ury + lly) * scale) |
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|
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resx, resy = self.GetPPIPrinter() |
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renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx) |
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renderer.RenderMap(self.map) |
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return wx.true |
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|
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|
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class MapCanvas(wxWindow): |
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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, interactor): |
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wxWindow.__init__(self, parent, winid) |
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self.SetBackgroundColour(wxColour(255, 255, 255)) |
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self.map = None |
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self.scale = 1.0 |
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self.offset = (0, 0) |
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self.dragging = 0 |
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self.tool = None |
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self.redraw_on_idle = 0 |
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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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wx.EVT_IDLE(self, self.OnIdle) |
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self.interactor = interactor |
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self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected) |
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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 None or not self.map.HasLayers(): |
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return |
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self.redraw_on_idle = 1 |
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|
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def do_redraw(self): |
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width, height = self.GetSizeTuple() |
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bitmap = wx.wxEmptyBitmap(width, height) |
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|
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dc = wx.wxMemoryDC() |
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dc.SelectObject(bitmap) |
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|
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dc.BeginDrawing() |
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|
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dc.SetBrush(wx.wxWHITE_BRUSH) |
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dc.SetPen(wx.wxTRANSPARENT_PEN) |
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dc.DrawRectangle(0, 0, width, height) |
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|
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if 1: #self.interactor.selected_map is self.map: |
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selected_layer = self.interactor.selected_layer |
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selected_shape = self.interactor.selected_shape |
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else: |
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selected_layer = None |
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selected_shape = None |
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|
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renderer = ScreenRenderer(dc, self.scale, self.offset) |
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renderer.RenderMap(self.map, selected_layer, selected_shape) |
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|
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clientdc = wxClientDC(self) |
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clientdc.BeginDrawing() |
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clientdc.Blit(0, 0, width, height, dc, 0, 0) |
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clientdc.EndDrawing() |
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|
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|
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def Print(self): |
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printer = wx.wxPrinter() |
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printout = MapPrintout(self.map) |
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printer.Print(self, printout, wx.true) |
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printout.Destroy() |
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|
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def SetMap(self, map): |
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redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_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.redraw) |
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self.map.Unsubscribe(MAP_PROJECTION_CHANGED, |
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self.projection_changed) |
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self.map = map |
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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.redraw) |
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self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed) |
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self.FitMapToWindow() |
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|
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def Map(self): |
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return self.map |
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|
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def redraw(self, *args): |
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self.Refresh(0) |
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|
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def projection_changed(self, *args): |
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self.FitMapToWindow() |
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self.redraw() |
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|
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def set_view_transform(self, scale, offset): |
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self.scale = scale |
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self.offset = offset |
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self.redraw() |
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|
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def proj_to_win(self, x, y): |
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"""\ |
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Return the point in window coords given by projected coordinates x y |
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""" |
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offx, offy = self.offset |
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return (self.scale * x + offx, -self.scale * y + offy) |
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|
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def win_to_proj(self, x, y): |
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"""\ |
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Return the point in projected coordinates given by window coords x y |
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""" |
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offx, offy = self.offset |
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return ((x - offx) / self.scale, (offy - y) / self.scale) |
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|
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def FitRectToWindow(self, rect): |
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width, height = self.GetSizeTuple() |
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llx, lly, urx, ury = rect |
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if llx == urx or lly == ury: |
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# zero with or zero height. Do Nothing |
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return |
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scalex = width / (urx - llx) |
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scaley = height / (ury - lly) |
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scale = min(scalex, scaley) |
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offx = 0.5 * (width - (urx + llx) * scale) |
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offy = 0.5 * (height + (ury + lly) * scale) |
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self.set_view_transform(scale, (offx, offy)) |
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|
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def FitMapToWindow(self): |
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"""\ |
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Set the scale and offset so that the map is centered in the |
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window |
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""" |
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bbox = self.map.ProjectedBoundingBox() |
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if bbox is not None: |
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self.FitRectToWindow(bbox) |
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|
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def ZoomFactor(self, factor): |
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width, height = self.GetSizeTuple() |
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scale = self.scale * factor |
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offx, offy = self.offset |
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offset = (factor * (offx - width / 2) + width / 2, |
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factor * (offy - height / 2) + height / 2) |
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self.set_view_transform(scale, offset) |
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|
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def ZoomOutToRect(self, rect): |
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# rect is given in window coordinates |
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|
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# determine the bbox of the displayed region in projected |
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# coordinates |
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width, height = self.GetSizeTuple() |
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llx, lly = self.win_to_proj(0, height - 1) |
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urx, ury = self.win_to_proj(width - 1, 0) |
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|
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sx, sy, ex, ey = rect |
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scalex = (ex - sx) / (urx - llx) |
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scaley = (ey - sy) / (ury - lly) |
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scale = min(scalex, scaley) |
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|
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offx = 0.5 * ((ex + sx) - (urx + llx) * scale) |
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offy = 0.5 * ((ey + sy) + (ury + lly) * scale) |
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self.set_view_transform(scale, (offx, offy)) |
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|
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def Translate(self, dx, dy): |
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offx, offy = self.offset |
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self.set_view_transform(self.scale, (offx + dx, offy + dy)) |
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|
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def ZoomInTool(self): |
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self.tool = ZoomInTool(self) |
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|
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def ZoomOutTool(self): |
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self.tool = ZoomOutTool(self) |
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|
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def PanTool(self): |
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self.tool = PanTool(self) |
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|
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def IdentifyTool(self): |
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self.tool = IdentifyTool(self) |
| 400 |
|
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def LabelTool(self): |
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self.tool = LabelTool(self) |
| 403 |
|
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def CurrentTool(self): |
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return self.tool and self.tool.Name() or None |
| 406 |
|
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def OnLeftDown(self, event): |
| 408 |
if self.tool is not None: |
| 409 |
self.drag_dc = wxClientDC(self) |
| 410 |
self.drag_dc.SetLogicalFunction(wxINVERT) |
| 411 |
self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH) |
| 412 |
self.CaptureMouse() |
| 413 |
self.tool.MouseDown(event) |
| 414 |
self.tool.Show(self.drag_dc) |
| 415 |
self.dragging = 1 |
| 416 |
|
| 417 |
def OnLeftUp(self, event): |
| 418 |
self.ReleaseMouse() |
| 419 |
if self.dragging: |
| 420 |
self.tool.Hide(self.drag_dc) |
| 421 |
self.tool.MouseUp(event) |
| 422 |
self.drag_dc = None |
| 423 |
self.dragging = 0 |
| 424 |
|
| 425 |
def OnMotion(self, event): |
| 426 |
if self.dragging: |
| 427 |
self.tool.Hide(self.drag_dc) |
| 428 |
self.tool.MouseMove(event) |
| 429 |
self.tool.Show(self.drag_dc) |
| 430 |
|
| 431 |
def OnIdle(self, event): |
| 432 |
if self.redraw_on_idle: |
| 433 |
self.do_redraw() |
| 434 |
self.redraw_on_idle = 0 |
| 435 |
|
| 436 |
def shape_selected(self, layer, shape): |
| 437 |
self.redraw() |
| 438 |
|
| 439 |
def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1): |
| 440 |
"""Determine the shape at point px, py in window coords |
| 441 |
|
| 442 |
Return the shape and the corresponding layer as a tuple (layer, |
| 443 |
shape). |
| 444 |
|
| 445 |
If the optional parameter select_labels is true (default false) |
| 446 |
search through the labels. If a label is found return it's index |
| 447 |
as the shape and None as the layer. |
| 448 |
|
| 449 |
If the optional parameter selected_layer is true (default), only |
| 450 |
search in the currently selected layer. |
| 451 |
""" |
| 452 |
map_proj = self.map.projection |
| 453 |
if map_proj is not None: |
| 454 |
forward = map_proj.Forward |
| 455 |
else: |
| 456 |
forward = None |
| 457 |
|
| 458 |
scale = self.scale |
| 459 |
offx, offy = self.offset |
| 460 |
|
| 461 |
if select_labels: |
| 462 |
labels = self.map.LabelLayer().Labels() |
| 463 |
|
| 464 |
if labels: |
| 465 |
dc = wxClientDC(self) |
| 466 |
font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL) |
| 467 |
dc.SetFont(font) |
| 468 |
for i in range(len(labels)): |
| 469 |
label = labels[i] |
| 470 |
x = label.x |
| 471 |
y = label.y |
| 472 |
text = label.text |
| 473 |
if forward: |
| 474 |
x, y = forward(x, y) |
| 475 |
x = x * scale + offx |
| 476 |
y = -y * scale + offy |
| 477 |
width, height = dc.GetTextExtent(text) |
| 478 |
if label.halign == ALIGN_LEFT: |
| 479 |
# nothing to be done |
| 480 |
pass |
| 481 |
elif label.halign == ALIGN_RIGHT: |
| 482 |
x = x - width |
| 483 |
elif label.halign == ALIGN_CENTER: |
| 484 |
x = x - width/2 |
| 485 |
if label.valign == ALIGN_TOP: |
| 486 |
# nothing to be done |
| 487 |
pass |
| 488 |
elif label.valign == ALIGN_BOTTOM: |
| 489 |
y = y - height |
| 490 |
elif label.valign == ALIGN_CENTER: |
| 491 |
y = y - height/2 |
| 492 |
if x <= px < x + width and y <= py <= y + height: |
| 493 |
return None, i |
| 494 |
|
| 495 |
if selected_layer: |
| 496 |
layer = self.interactor.SelectedLayer() |
| 497 |
if layer is not None: |
| 498 |
layers = [layer] |
| 499 |
else: |
| 500 |
# no layer selected. Use an empty list to effectively |
| 501 |
# ignore all layers. |
| 502 |
layers = [] |
| 503 |
else: |
| 504 |
layers = self.map.Layers() |
| 505 |
|
| 506 |
for layer_index in range(len(layers) - 1, -1, -1): |
| 507 |
layer = layers[layer_index] |
| 508 |
|
| 509 |
# search only in visible layers |
| 510 |
if not layer.Visible(): |
| 511 |
continue |
| 512 |
|
| 513 |
filled = layer.fill is not None |
| 514 |
stroked = layer.stroke is not None |
| 515 |
|
| 516 |
layer_proj = layer.projection |
| 517 |
if layer_proj is not None: |
| 518 |
inverse = layer_proj.Inverse |
| 519 |
else: |
| 520 |
inverse = None |
| 521 |
|
| 522 |
shapetype = layer.ShapeType() |
| 523 |
|
| 524 |
select_shape = -1 |
| 525 |
if shapetype == SHAPETYPE_POLYGON: |
| 526 |
for i in range(layer.NumShapes()): |
| 527 |
result = point_in_polygon_shape(layer.shapefile.cobject(), |
| 528 |
i, |
| 529 |
filled, stroked, |
| 530 |
map_proj, layer_proj, |
| 531 |
scale, -scale, offx, offy, |
| 532 |
px, py) |
| 533 |
if result: |
| 534 |
select_shape = i |
| 535 |
break |
| 536 |
elif shapetype == SHAPETYPE_ARC: |
| 537 |
for i in range(layer.NumShapes()): |
| 538 |
result = point_in_polygon_shape(layer.shapefile.cobject(), |
| 539 |
i, 0, 1, |
| 540 |
map_proj, layer_proj, |
| 541 |
scale, -scale, offx, offy, |
| 542 |
px, py) |
| 543 |
if result < 0: |
| 544 |
select_shape = i |
| 545 |
break |
| 546 |
elif shapetype == SHAPETYPE_POINT: |
| 547 |
for i in range(layer.NumShapes()): |
| 548 |
shape = layer.Shape(i) |
| 549 |
x, y = shape.Points()[0] |
| 550 |
if inverse: |
| 551 |
x, y = inverse(x, y) |
| 552 |
if forward: |
| 553 |
x, y = forward(x, y) |
| 554 |
x = x * scale + offx |
| 555 |
y = -y * scale + offy |
| 556 |
if hypot(px - x, py - y) < 5: |
| 557 |
select_shape = i |
| 558 |
break |
| 559 |
|
| 560 |
if select_shape >= 0: |
| 561 |
return layer, select_shape |
| 562 |
return None, None |
| 563 |
|
| 564 |
def SelectShapeAt(self, x, y): |
| 565 |
layer, shape = self.find_shape_at(x, y) |
| 566 |
# If layer is None, then shape will also be None. We don't want |
| 567 |
# to deselect the currently selected layer, so we simply select |
| 568 |
# the already selected layer again. |
| 569 |
if layer is None: |
| 570 |
layer = self.interactor.SelectedLayer() |
| 571 |
self.interactor.SelectLayerAndShape(layer, shape) |
| 572 |
|
| 573 |
def LabelShapeAt(self, x, y): |
| 574 |
ox = x; oy = y |
| 575 |
label_layer = self.map.LabelLayer() |
| 576 |
layer, shape_index = self.find_shape_at(x, y, select_labels = 1) |
| 577 |
if layer is None and shape_index is not None: |
| 578 |
# a label was selected |
| 579 |
label_layer.RemoveLabel(shape_index) |
| 580 |
elif layer is not None: |
| 581 |
text = labeldialog.run_label_dialog(self, layer.table, shape_index) |
| 582 |
if text: |
| 583 |
proj = self.map.projection |
| 584 |
if proj is not None: |
| 585 |
map_proj = proj |
| 586 |
else: |
| 587 |
map_proj = None |
| 588 |
proj = layer.projection |
| 589 |
if proj is not None: |
| 590 |
layer_proj = proj |
| 591 |
else: |
| 592 |
layer_proj = None |
| 593 |
|
| 594 |
shapetype = layer.ShapeType() |
| 595 |
if shapetype == SHAPETYPE_POLYGON: |
| 596 |
x, y = shape_centroid(layer.shapefile.cobject(), |
| 597 |
shape_index, |
| 598 |
map_proj, layer_proj, 1, 1, 0, 0) |
| 599 |
if map_proj is not None: |
| 600 |
x, y = map_proj.Inverse(x, y) |
| 601 |
else: |
| 602 |
shape = layer.Shape(shape_index) |
| 603 |
if shapetype == SHAPETYPE_POINT: |
| 604 |
x, y = shape.Points()[0] |
| 605 |
else: |
| 606 |
# assume SHAPETYPE_ARC |
| 607 |
points = shape.Points() |
| 608 |
x, y = points[len(points) / 2] |
| 609 |
if layer_proj is not None: |
| 610 |
x, y = layer_proj.Inverse(x, y) |
| 611 |
if shapetype == SHAPETYPE_POINT: |
| 612 |
halign = ALIGN_LEFT |
| 613 |
valign = ALIGN_CENTER |
| 614 |
elif shapetype == SHAPETYPE_POLYGON: |
| 615 |
halign = ALIGN_CENTER |
| 616 |
valign = ALIGN_CENTER |
| 617 |
elif shapetype == SHAPETYPE_ARC: |
| 618 |
halign = ALIGN_LEFT |
| 619 |
valign = ALIGN_CENTER |
| 620 |
label_layer.AddLabel(x, y, text, |
| 621 |
halign = halign, valign = valign) |
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