249 lines
11 KiB
Python
249 lines
11 KiB
Python
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"""
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Copyright (C) 2015 Maren Hachmann, marenhachmann@yahoo.com
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Copyright (C) 2010 Blair Bonnett, blair.bonnett@gmail.com (parts from multiscale extension)
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Copyright (C) 2005 Aaron Spike, aaron@ekips.org (parts from perspective extension)
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Copyright (C) 2015 Giacomo Mirabassi, giacomo@mirabassi.it (parts from jpeg export extension)
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Copyright (C) 2016 Neon22 @github (scale ruler)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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import math
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import inkex
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from inkex import Transform
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from inkex.paths import CubicSuperPath
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from lxml import etree
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### Scale Ruler
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# inches = [1, 2, 4, 8, 16, 24, 32, 48, 64, 96, 128]
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# metric = [1,2,5,10,20,50,100,200,250,500,1000,1250,2500]
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# TODO:
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# - maybe turn dropdown for choosing scale type (metric/imperial/custom) into radio buttons?
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# - scale font size
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# - scale box-height better for small boxes
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# - add ruler into current layer
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# - add magnification e.g. 2:1 for small drawings
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class ScaleToReal(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument('--tab')
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pars.add_argument('--length', type=float, default=100.0, help='Length of scaling path in real-world units')
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pars.add_argument('--unit', default='cm', help='Real-world unit')
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pars.add_argument('--showscale', default='false', help='Show Scale Ruler')
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pars.add_argument('--choosescale', default='all', help='Choose Scale')
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pars.add_argument('--metric', default='1', help='Common metric scales')
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pars.add_argument('--imperial',default='1', help='Common imperial scales')
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pars.add_argument('--custom_scale', type=float, default=45, help='Custom scale')
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pars.add_argument('--unitlength', type=int, default='1', help='Length of scale ruler')
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def calc_scale_center(self, p1x, p1y, p2x, p2y):
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""" Use straight line as scaling center.
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- determine which point is center on basis of quadrant the line is in.
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- approx this by using center of line
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0,0 corresponds to UL corner of page
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"""
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scale_center = (0,0) # resulting scaling point
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# calc page center
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pagecenter_x = self.svg.unittouu(self.document.getroot().get('width'))/2
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pagecenter_y = self.svg.unittouu(self.document.getroot().get('height'))/2
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# calc minmax of straightline ref points
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minx = min(p1x, p2x)
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maxx = max(p1x, p2x)
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miny = min(p1y, p2y)
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maxy = max(p1y, p2y)
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# simplifiy calc by using center of line to determine quadrant
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line_x = p1x + (p2x - p1x)/2
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line_y = p1y + (p2y - p1y)/2
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# determine quadrant
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if line_x < pagecenter_x:
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# Left hand side
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if line_y < pagecenter_y:
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scale_center = (minx,miny) # UL
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else:
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scale_center = (minx,maxy) # LL
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else: # Right hand side
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if line_y < pagecenter_y:
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scale_center = (maxx,miny) # UR
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else:
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scale_center = (maxx,maxy) # LR
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#inkex.debug("%s %s,%s" % (scale_center, pagecenter_x*2, pagecenter_y*2))
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return scale_center
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def create_ruler(self, parent, width, pos, value, drawing_scale):
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""" Draw Scale ruler
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- Position above user's straightline.
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- Ruler shows two units together. First one cut into 5
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- pos is a tuple e.g. (0,0)
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TODO:
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- Fix font size for large and small rulers
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- Fix line width for large and small rulers
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"""
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" Ruler is always 2 units long with 5 divs in the left half "
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# Draw two boxes next to each other. Top half of right half of ruler is filled black
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line_width = self.svg.unittouu('0.25 mm')
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box_height = max(width/15, self.svg.unittouu('2 mm'))
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font_height = 8
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White = '#ffffff'
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Black = '#000000'
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t = 'translate' + str(pos)
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# create clip in order to get an exact ruler width (without the outer half of the stroke)
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path = '//svg:defs'
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defslist = self.document.getroot().xpath(path, namespaces=inkex.NSS)
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if len(defslist) > 0:
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defs = defslist[0]
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clipPathData = {inkex.addNS('label', 'inkscape'):'rulerClipPath', 'clipPathUnits':'userSpaceOnUse', 'id':'rulerClipPath'}
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clipPath = etree.SubElement(defs, 'clipPath', clipPathData)
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clipBox = {'x':str(-width), 'y':'0.0',
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'width':str(width*2), 'height':str(box_height),
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'style':'fill:%s; stroke:none; fill-opacity:1;' % (Black)}
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etree.SubElement(clipPath, 'rect', clipBox)
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# create groups for scale rule and ruler
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scale_group = etree.SubElement(parent, 'g', {inkex.addNS('label','inkscape'):'scale_group', 'transform':t})
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ruler_group = etree.SubElement(scale_group, 'g', {inkex.addNS('label','inkscape'):'ruler', 'clip-path':"url(#rulerClipPath)"})
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# box for right half of ruler
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boxR = {'x':'0.0', 'y':'0.0',
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'width':str(width), 'height':str(box_height),
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'style':'fill:%s; stroke:%s; stroke-width:%s; stroke-opacity:1; fill-opacity:1;' % (White, Black, line_width)}
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etree.SubElement(ruler_group, 'rect', boxR)
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# top half black
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boxRf = {'x':'0.0', 'y':'0.0',
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'width':str(width), 'height':str(box_height/2),
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'style':'fill:%s; stroke:none; fill-opacity:1;' % (Black)}
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etree.SubElement(ruler_group, 'rect', boxRf)
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# Left half of ruler
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boxL = {'x':str(-width), 'y':'0.0',
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'width':str(width), 'height':str(box_height),
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'style':'fill:%s; stroke:%s; stroke-width:%s; stroke-opacity:1; fill-opacity:1;' % (White, Black, line_width)}
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etree.SubElement(ruler_group, 'rect', boxL)
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# staggered black fills on left half
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start = -width
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for i in range(5):
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boxRf = {'x':str(start), 'y':str((i+1)%2 * box_height/2),
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'width':str(width/5), 'height':str(box_height/2),
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'style':'fill:%s; stroke:none; fill-opacity:1;' % (Black)}
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etree.SubElement(ruler_group, 'rect', boxRf)
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start += width/5
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# text
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textstyle = {'font-size': str(font_height)+ " px",
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'font-family': 'sans-serif',
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'text-anchor': 'middle',
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'text-align': 'center',
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'fill': Black }
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text_atts = {'style': str(inkex.Style(textstyle)),
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'x': '0', 'y': str(-font_height/2) }
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text = etree.SubElement(scale_group, 'text', text_atts)
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text.text = "0"
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text_atts = {'style': str(inkex.Style(textstyle)),
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'x': str(width), 'y': str(-font_height/2) }
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text = etree.SubElement(scale_group, 'text', text_atts)
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text.text = str(value)
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text_atts = {'style':str(inkex.Style(textstyle)),
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'x': str(-width), 'y': str(-font_height/2) }
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text = etree.SubElement(scale_group, 'text', text_atts)
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text.text = str(value)
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# Scale note
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text_atts = {'style':str(inkex.Style(textstyle)),
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'x': '0', 'y': str(-font_height*2.5) }
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text = etree.SubElement(scale_group, 'text', text_atts)
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text.text = "Scale 1:" + str(drawing_scale) + " (" + self.options.unit + ")"
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def effect(self):
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if len(self.options.ids) != 2:
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inkex.errormsg("This extension requires two selected objects. The first selected object must be the straight line with two nodes.")
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exit()
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# drawing that will be scaled is selected second, must be a single object
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scalepath = self.svg.selected[self.options.ids[0]]
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drawing = self.svg.selected[self.options.ids[1]]
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if scalepath.tag != inkex.addNS('path','svg'):
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inkex.errormsg("The first selected object is not a path.\nPlease select a straight line with two nodes instead.")
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exit()
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# apply its transforms to the scaling path, so we get the correct coordinates to calculate path length
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scalepath.apply_transform()
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path = CubicSuperPath(scalepath.get('d'))
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if len(path) < 1 or len(path[0]) < 2:
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inkex.errormsg("This extension requires that the first selected path be two nodes long.")
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exit()
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# We imagine the path is in the root layer, with no transforms:
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# get its parent transforms (its own ones are already applied):
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ct = scalepath.composed_transform()
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# now we apply that matrix inversely to make it
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# as large (or small) as it really is
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path = path.transform(ct)
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# calculate path length
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p1_x = path[0][0][1][0]
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p1_y = path[0][0][1][1]
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p2_x = path[0][1][1][0]
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p2_y = path[0][1][1][1]
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p_length = self.svg.unittouu(str(distance((p1_x, p1_y),(p2_x, p2_y))) + self.svg.unit)
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# Find Drawing Scale
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if self.options.choosescale == 'metric':
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drawing_scale = int(self.options.metric)
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elif self.options.choosescale == 'imperial':
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drawing_scale = int(self.options.imperial)
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elif self.options.choosescale == 'custom':
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drawing_scale = self.options.custom_scale
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# calculate scaling center
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center = self.calc_scale_center(p1_x, p1_y, p2_x, p2_y)
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# calculate scaling factor
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target_length = self.svg.unittouu(str(self.options.length) + self.options.unit)
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factor = (target_length / p_length) / drawing_scale
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# inkex.debug("%s, %s %s" % (target_length, p_length, factor))
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# Add scale ruler
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if self.options.showscale == "true":
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dist = int(self.options.unitlength)
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ruler_length = self.svg.unittouu(str(dist) + self.options.unit) / drawing_scale
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ruler_pos = (p1_x + (p2_x - p1_x)/2, (p1_y + (p2_y - p1_y)/2) - self.svg.unittouu('4 mm'))
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# TODO: add into current layer instead
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self.create_ruler(self.document.getroot(), ruler_length, ruler_pos, dist, drawing_scale)
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# Get drawing and current transformations
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for obj in (scalepath, drawing):
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# Scale both objects about the center, first translate back to origin
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scale_matrix = [[1, 0.0, -center[0]], [0.0, 1, -center[1]]]
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obj.transform = Transform(scale_matrix) @ obj.transform
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# Then scale
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scale_matrix = [[factor, 0.0, 0.0], [0.0, factor, 0.0]]
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obj.transform = Transform(scale_matrix) @ obj.transform
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# Then translate back to original scale center location
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scale_matrix = [[1, 0.0, center[0]], [0.0, 1, center[1]]]
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obj.transform = Transform(scale_matrix) @ obj.transform
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# Helper function
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def distance(xy0, xy1):
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x0, y0 = xy0
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x1, y1 = xy1
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return math.sqrt((x0-x1)*(x0-x1) + (y0-y1)*(y0-y1))
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if __name__ == '__main__':
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ScaleToReal().run()
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