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# -*- coding: utf-8 -*-
'''
Copyright (C) 2008 Thomas Holder, http://sf.net/users/speleo3/
Distributed under the terms of the GNU General Public License v2
'''
import math
try:
import inkex
except:
import speleoex
import inkex
import simpletransform
def i2d_affine(self, node):
m2 = simpletransform.parseTransform(node.get('transform'))
while True:
node = node.getparent()
if node is None:
break
viewBox = node.get('viewBox')
t1 = node.get('transform')
if viewBox:
viewBox = [float(i) for i in viewBox.split()]
doc_width = self.unittouu(node.get('width', viewBox[2]))
doc_height = self.unittouu(node.get('height', viewBox[3]))
m1 = [[doc_width / viewBox[2], 0, -viewBox[0]], [0, doc_height / viewBox[3], -viewBox[1]]]
elif t1:
m1 = simpletransform.parseTransform(t1)
else:
continue
m2 = simpletransform.composeTransform(m1, m2)
return m2
def det(mat):
return mat[0][0] * mat[1][1] - mat[0][1] * mat[1][0]
def inverse(mat):
d = [[1,0,0],[0,1,0]]
determ = det(mat)
if abs(determ) > 0.0001:
ideterm = 1.0 / determ
d[0][0] = mat[1][1] * ideterm
d[0][1] = -mat[0][1] * ideterm
d[1][0] = -mat[1][0] * ideterm
d[1][1] = mat[0][0] * ideterm
d[0][2] = -mat[0][2] * d[0][0] - mat[1][2] * d[1][0]
d[1][2] = -mat[0][2] * d[0][1] - mat[1][2] * d[1][1]
return d
class Scalebar:
def __init__(self, scale, dpi = 96, text = "Scale", docunit = 1.0):
mag = int(math.log10(scale))
if mag < 2:
units = 'cm'
factor = 10 ** mag
elif mag < 5:
units = 'm'
factor = 10 ** (mag - 2)
else:
units = 'km'
factor = 10 ** (mag - 5)
step = scale / (10 ** mag)
if step < 2:
step = 1
elif step < 5:
step = 2
else:
step = 5
steplength = dpi / 2.54 / scale * step * 10 ** mag / docunit;
d = "m%f,0 h-%f v%f h%f z " % (2 * steplength, steplength, 7 / docunit, steplength) * 3
d = d.replace(' ', ' m-%f,0 ' % steplength, 1)
self.g = inkex.etree.Element('g')
self.g.set('style', 'font-size:10px;text-anchor:middle;font-family:sans-serif')
self.g.set(inkex.addNS('label', 'inkscape'), 'none scalebar')
node = inkex.etree.Element('path')
node.set('d', d)
node.set('style', 'fill:black;stroke:none')
self.g.append(node)
node = inkex.etree.Element('path')
node.set('d', 'M0,0 h%f M0,%f h%f' % (steplength * 5, 7 / docunit, steplength * 5))
node.set('style', 'fill:none;stroke:black;stroke-width:' + str(0.5 / docunit))
self.g.append(node)
for i in range(6):
node = inkex.etree.Element('text')
node.set('x', str(steplength * i * docunit))
node.set('y', str(18))
node.set('transform', 'scale(' + str(1 / docunit) + ')')
node.text = str(step * i * factor)
if i == 5:
node.text += units
self.g.append(node)
if len(text):
if isinstance(text, bytes):
text = text.decode('utf-8')
node = inkex.etree.Element('text')
node.set('y', str(-5))
node.set('style', 'text-anchor:start')
node.set('transform', 'scale(' + str(1 / docunit) + ')')
node.text = text + " 1:" + str(scale)
self.g.append(node)
def get_tree(self):
return self.g
def get_xml(self):
return inkex.etree.tostring(self.g)
class InsertScalebar(inkex.Effect):
try:
inkex.Effect.unittouu
except AttributeError:
unittouu = inkex.unittouu
def __init__(self):
inkex.Effect.__init__(self)
self.OptionParser.add_option("--scale",
action="store", type="int",
dest="scale", default=100,
help="Scale")
self.OptionParser.add_option("--dpi",
action="store", type="int",
dest="dpi", default=96,
help="DPI")
self.OptionParser.add_option("--text",
action="store", type="string",
dest="text", default="")
def get_current_layer(self):
layer = self.current_layer
while True:
groupmode = layer.get(inkex.addNS('groupmode', 'inkscape'))
if groupmode == 'layer':
break
parent = layer.getparent()
if parent == None:
break
layer = parent
return layer
# TODO verify height is correct in case of viewBox
def dt2doc(self, xy):
root = self.document.getroot()
height = root.get('height', '100%')
if height[-1] == '%':
height = 1052.36 # assume default A4 height
else:
height = self.unittouu(height)
y = height - xy[1]
return (xy[0], y)
def effect(self):
layer = self.get_current_layer()
affine = inverse(i2d_affine(self, layer))
transform = simpletransform.formatTransform(affine) + \
' translate' + str(self.view_center)
g = Scalebar(self.options.scale, self.options.dpi, self.options.text, self.uutounit(1, 'px')).get_tree()
g.set('transform', transform)
layer.append(g)
if __name__ == '__main__':
e = InsertScalebar()
e.affect()
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