Thuban/UI/scalebar.py

# Copyright (c) 2001, 2002 by Intevation GmbH
# Authors:
# Frank Koormann <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

from Thuban import _
from Thuban.Model.scalebar import deriveInterval, roundInterval
from Thuban.Model.proj import PROJ_UNITS_METERS

import wx

class ScaleBar:

    def __init__(self, map):
        self.map = map

    def DrawScaleBar(self, scale, dc, position, size):
        """Draw a scalebar on a given DC"""

        # Only draw a legend if the corresponding map has a layer
        if self.map is not None \
            and self.map.projection is not None \
            and len(self.map.layers) > 0 \
            and scale > 0.0:

            # We have a projection, draw the scalebar in bw
            BlackPen = wx.BLACK_PEN
            BlackBrush = wx.BLACK_BRUSH
            BlackText = wx.BLACK

            # Get the dimension
            width, height = size
            posx, posy    = position
            l1width, l1height = dc.GetTextExtent("%d"%0)

            # Make a first guess for the interval (to get the size we have 
            # to reserve for the labels)
            interval, unit = deriveInterval(width, scale)
            l2width, l2height = dc.GetTextExtent("%d %s"%(interval,unit))
            width = width - 4.0 - l1width/2.0 -l2width/2.0

            # Having precised the width now the final interval can be calculated
            interval, unit  = deriveInterval(width, scale)
            interval, label = roundInterval(interval)

            if interval > 0.0:
                # We draw 2 rectangles with half the width
                if unit == 'km':
                    width = int(interval*1000.0*scale/2)
                else:
                    width = int(interval*scale/2)

                dc.SetPen(BlackPen)

                brush = wx.Brush(wx.WHITE, wx.SOLID)
                dc.SetBrush(brush)
                dc.DrawRectangle(posx+4,posy+2,width,8)

                dc.SetBrush(BlackBrush)
                dc.DrawRectangle(posx+width+4,posy+2,width,8)

                dc.SetTextForeground(BlackText)
                dc.DrawText("%d"%0, posx+ 4 - l1width/2, posy+12)

                l2width, l2height = dc.GetTextExtent("%s %s"%(label, unit))
                dc.DrawText("%s %s"%(interval, unit), posx+ 2*width+4 - l2width/2, posy + 12)

1	frank	862	# Copyright (c) 2001, 2002 by Intevation GmbH
2			# Authors:
3			# Frank Koormann <[email protected]>
4			#
5			# This program is free software under the GPL (>=v2)
6			# Read the file COPYING coming with Thuban for details.
7
8			__version__ = "$Revision$"
9
10			from Thuban import _
11	frank	869	from Thuban.Model.scalebar import deriveInterval, roundInterval
12	jonathan	1253	from Thuban.Model.proj import PROJ_UNITS_METERS
13	frank	862
14	dpinte	2700	import wx
15	frank	862
16			class ScaleBar:
17
18			def __init__(self, map):
19			self.map = map
20
21	frank	912	def DrawScaleBar(self, scale, dc, position, size):
22	frank	862	"""Draw a scalebar on a given DC"""
23
24			# Only draw a legend if the corresponding map has a layer
25	jonathan	1253	if self.map is not None \
26			and self.map.projection is not None \
27			and len(self.map.layers) > 0 \
28			and scale > 0.0:
29	frank	862
30	jonathan	1253	# We have a projection, draw the scalebar in bw
31	dpinte	2700	BlackPen = wx.BLACK_PEN
32			BlackBrush = wx.BLACK_BRUSH
33			BlackText = wx.BLACK
34
35	frank	862	# Get the dimension
36	frank	912	width, height = size
37			posx, posy = position
38	frank	862	l1width, l1height = dc.GetTextExtent("%d"%0)
39
40			# Make a first guess for the interval (to get the size we have
41			# to reserve for the labels)
42			interval, unit = deriveInterval(width, scale)
43			l2width, l2height = dc.GetTextExtent("%d %s"%(interval,unit))
44			width = width - 4.0 - l1width/2.0 -l2width/2.0
45	dpinte	2700
46	frank	862	# Having precised the width now the final interval can be calculated
47			interval, unit = deriveInterval(width, scale)
48			interval, label = roundInterval(interval)
49	dpinte	2700
50	frank	871	if interval > 0.0:
51			# We draw 2 rectangles with half the width
52			if unit == 'km':
53			width = int(interval1000.0scale/2)
54			else:
55			width = int(interval*scale/2)
56	dpinte	2700
57	frank	871	dc.SetPen(BlackPen)
58	frank	862
59	dpinte	2700	brush = wx.Brush(wx.WHITE, wx.SOLID)
60	frank	871	dc.SetBrush(brush)
61	frank	912	dc.DrawRectangle(posx+4,posy+2,width,8)
62	frank	862
63	frank	871	dc.SetBrush(BlackBrush)
64	frank	912	dc.DrawRectangle(posx+width+4,posy+2,width,8)
65	frank	862
66	frank	871	dc.SetTextForeground(BlackText)
67	frank	912	dc.DrawText("%d"%0, posx+ 4 - l1width/2, posy+12)
68	frank	862
69	frank	871	l2width, l2height = dc.GetTextExtent("%s %s"%(label, unit))
70	frank	912	dc.DrawText("%s %s"%(interval, unit), posx+ 2*width+4 - l2width/2, posy + 12)
71	frank	862
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svn:eol-style	native
svn:keywords	Author Date Id Revision