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# Copyright (c) 2001, 2002 by Intevation GmbH |
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# Authors: |
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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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__version__ = "$Revision$" |
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from Thuban import _ |
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from wxPython.wx import * |
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class ScaleBar: |
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def __init__(self, map): |
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self.map = map |
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def DrawScalebar(self, scale, dc): |
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"""Draw a scalebar on a given DC""" |
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# Only draw a legend if the corresponding map has a layer |
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if self.map is not None and len(self.map.layers) > 0: |
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# If no projection is specified, the scale information _might_ |
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# be reasonable. So gray out the scalebar in these cases. |
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if self.map.projection is None: |
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BlackPen = wxGREY_PEN |
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BlackBrush = wxGREY_BRUSH |
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BlackText = wxColor(127,127,127) |
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else: |
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BlackPen = wxBLACK_PEN |
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BlackBrush = wxBLACK_BRUSH |
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BlackText = wxBLACK |
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# Get the dimension |
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width, height = dc.GetSizeTuple() |
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l1width, l1height = dc.GetTextExtent("%d"%0) |
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# Make a first guess for the length (to get the size we have |
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# to reserve for the labels) |
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length, unit = self.deriveLength(width, scale) |
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l2width, l2height = dc.GetTextExtent("%d %s"%(length,unit)) |
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width = width - 4.0 - l1width/2.0 -l2width/2.0 |
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# Having precised the width now the final length can be calculated |
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length, unit = self.deriveLength(width, scale) |
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length = self.roundInterval(length) |
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# We draw 2 rectangles with half the width |
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if unit == 'km': |
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width = int(length*1000.0*scale/2) |
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else: |
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width = int(length*scale/2) |
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dc.SetPen(BlackPen) |
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brush = wxBrush(wxWHITE, wxSOLID) |
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dc.SetBrush(brush) |
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dc.DrawRectangle(4,2,width,8) |
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dc.SetBrush(BlackBrush) |
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dc.DrawRectangle(width+4,2,width,8) |
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dc.SetTextForeground(BlackText) |
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dc.DrawText("%d"%0, 4 - l1width/2, 12) |
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l2width, l2height = dc.GetTextExtent("%d %s"%(length, unit)) |
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dc.DrawText("%d %s"%(length, unit), 2*width+4 - l2width/2, 12) |
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def deriveLength(self, width, scale): |
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length = width / scale |
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if length / 1000 > 1: |
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length = int(length / 1000) |
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unit = 'km' |
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else: |
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length = int(length) |
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unit = 'm' |
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return length, unit |
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def roundInterval(self, d): |
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if d<.001: |
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return int(d*10000)/10000.0 |
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if d<.01: |
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return int(d*1000)/1000.0 |
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if d<.1: |
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return int(d*100)/100.0 |
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if d<1: |
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return int(d*10)/10.0 |
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if d<10: |
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return int(d) |
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if d<100: |
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return int(d/10) * 10 |
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if d<1000: |
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return int(d/100) * 100 |
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if d<10000: |
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return int(d/1000) * 1000 |
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if d<100000: |
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return int(d/10000) * 10000 |
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return -1 |
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