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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 Thuban.Model.scalebar import deriveInterval, roundInterval |
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from wxPython.wx import * |
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class ScaleBar: |
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|
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def __init__(self, map): |
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self.map = map |
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def DrawScaleBar(self, scale, dc, position, size): |
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"""Draw a scalebar on a given DC""" |
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|
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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 and scale > 0.0: |
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|
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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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params = {} |
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# For geographic projection we have to convert the scale from |
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# Unit DD to meters. |
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for p in self.map.projection.params: |
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key, value = p.split('=') |
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params[key] = value |
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if params['proj'] == 'latlong': |
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scale = scale * 0.017453 / 1000.0 |
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# We have a projection, draw the scalebar in bw |
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BlackPen = wxBLACK_PEN |
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BlackBrush = wxBLACK_BRUSH |
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BlackText = wxBLACK |
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|
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# Get the dimension |
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width, height = size |
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posx, posy = position |
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l1width, l1height = dc.GetTextExtent("%d"%0) |
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|
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# Make a first guess for the interval (to get the size we have |
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# to reserve for the labels) |
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interval, unit = deriveInterval(width, scale) |
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l2width, l2height = dc.GetTextExtent("%d %s"%(interval,unit)) |
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width = width - 4.0 - l1width/2.0 -l2width/2.0 |
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|
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# Having precised the width now the final interval can be calculated |
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interval, unit = deriveInterval(width, scale) |
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interval, label = roundInterval(interval) |
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|
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if interval > 0.0: |
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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(interval*1000.0*scale/2) |
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else: |
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width = int(interval*scale/2) |
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|
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dc.SetPen(BlackPen) |
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|
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brush = wxBrush(wxWHITE, wxSOLID) |
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dc.SetBrush(brush) |
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dc.DrawRectangle(posx+4,posy+2,width,8) |
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dc.SetBrush(BlackBrush) |
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dc.DrawRectangle(posx+width+4,posy+2,width,8) |
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dc.SetTextForeground(BlackText) |
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dc.DrawText("%d"%0, posx+ 4 - l1width/2, posy+12) |
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l2width, l2height = dc.GetTextExtent("%s %s"%(label, unit)) |
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dc.DrawText("%s %s"%(interval, unit), posx+ 2*width+4 - l2width/2, posy + 12) |
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