283 lines
12 KiB
Python
283 lines
12 KiB
Python
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#!/usr/bin/env python3
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'''
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Tool for drawing beautiful DIN-conform dimensioning arrows
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(c) 2012 by Johannes B. Rutzmoser, johannes.rutzmoser (at) googlemail (dot) com
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Please contact me, if you know a way how the extension module accepts mouse input; this would help to improve the tool
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Add this file and the dimensioning.inx file into the following folder to get the feature run:
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UNIX:
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$HOME/.config/inkscape/extensions/
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Mac OS X (when using the binary):
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/Applications/Inkscape.app/Contents/Resources/extensions/
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or
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/Applications/Inkscape.app/Contents/Resources/share/inkscape/extensions
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WINDOWS (Filepath may differ, depending where the program was installed):
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C:\Program Files\Inkscape\share\extensions
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License:
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GNU GENERAL PUBLIC LICENSE
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'''
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import inkex
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import numpy as np
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import gettext
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_ = gettext.gettext
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from lxml import etree
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from inkex import paths
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def norm(a):
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return a/np.sqrt(np.dot(a, a))
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def rotate(tangentvec, point):
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if tangentvec[0] == 0:
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angle = - np.pi/2
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else:
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angle = np.arctan(tangentvec[1]/tangentvec[0])
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return 'rotate(' + str(angle/np.pi*180) + ',' + str(point[0]) + ',' + str(point[1]) + ')'
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class Dimensioning(inkex.Effect):
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def __init__(self):
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inkex.Effect.__init__(self)
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# the options given in the dialouge
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self.arg_parser.add_argument("--orientation", default='horizontal', help="The type of orientation of the dimensioning (horizontal, vertical or parallel)")
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self.arg_parser.add_argument("--arrow_orientation", default='auto', help="The type of orientation of the arrows")
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self.arg_parser.add_argument("--line_scale", type=float, default=1.0, help="Scale factor for the line thickness")
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self.arg_parser.add_argument("--overlap", type=float, default=1.0, help="Overlap of the helpline over the dimensioning line")
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self.arg_parser.add_argument("--distance", type=float, default=1.0, help="Distance of the helpline to the object")
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self.arg_parser.add_argument("--position", type=float, default=1.0, help="position of the dimensioning line")
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self.arg_parser.add_argument("--flip", type=inkex.Boolean, default=False, help="flip side")
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self.arg_parser.add_argument("--scale_factor", type=float, default=1.0, help="scale factor for the dimensioning text")
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self.arg_parser.add_argument("--unit", default='px', help="The unit that should be used for the dimensioning")
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self.arg_parser.add_argument("--rotate", type=inkex.Boolean, default=True, help="Rotate the annotation?")
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self.arg_parser.add_argument("--digit", type=int, default=0, help="number of digits after the point")
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self.arg_parser.add_argument("--tab", default="sampling", help="The selected UI-tab when OK was pressed")
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def create_linestyles(self):
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'''
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Create the line styles for the drawings.
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'''
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self.helpline_style = {
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'stroke' : '#000000',
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'stroke-width' : '{}px'.format(0.5*self.options.line_scale),
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'fill' : 'none'
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}
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self.dimline_style = {
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'stroke' : '#000000',
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'stroke-width' : '{}px'.format(0.75*self.options.line_scale),
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'fill' : 'none',
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'marker-start' : 'url(#ArrowDIN-start)',
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'marker-end' : 'url(#ArrowDIN-end)'
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}
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self.text_style = {
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'font-size' : '{}px'.format(12*self.options.line_scale),
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'font-family' : 'Sans',
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'font-style' : 'normal',
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'text-anchor' : 'middle'
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}
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self.helpline_attribs = {'style' : str(inkex.Style(self.helpline_style)),
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inkex.addNS('label', 'inkscape') : 'helpline',
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'd' : 'm 0,0 100,0'
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}
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self.text_attribs = {'style' : str(inkex.Style(self.text_style)),
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'x' : '100',
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'y' : '100'
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}
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self.dimline_attribs = {'style' : str(inkex.Style(self.dimline_style)),
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inkex.addNS('label','inkscape') : 'dimline',
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'd' : 'm 0,0 200,0'
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}
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def effect(self):
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# will be executed when feature is activated
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self.create_linestyles()
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self.makeGroup()
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self.getPoints()
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self.calcab()
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self.drawHelpline()
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self.drawDimension()
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self.drawText()
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def makeMarkerstyle(self, name, rotate):
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defs = self.svg.getElement('/svg:svg//svg:defs')
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if defs == None:
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defs = etree.SubElement(self.document.getroot(),inkex.addNS('defs','svg'))
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marker = etree.SubElement(defs ,inkex.addNS('marker','svg'))
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marker.set('id', name)
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marker.set('orient', 'auto')
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marker.set('refX', '0.0')
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marker.set('refY', '0.0')
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marker.set('style', 'overflow:visible')
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marker.set(inkex.addNS('stockid','inkscape'), name)
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arrow = etree.Element("path")
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# messy but works; definition of arrows in beautiful DIN-shapes:
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if name.startswith('ArrowDIN-'):
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if rotate:
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arrow.set('d', 'M 8,0 -8,2.11 -8,-2.11 z')
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else:
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arrow.set('d', 'M -8,0 8,-2.11 8,2.11 z')
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if name.startswith('ArrowDINout-'):
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if rotate:
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arrow.set('d', 'M 0,0 16,2.11 16,0.5 26,0.5 26,-0.5 16,-0.5 16,-2.11 z')
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else:
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arrow.set('d', 'M 0,0 -16,2.11 -16,0.5 -26,0.5 -26,-0.5 -16,-0.5 -16,-2.11 z')
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arrow.set('style', 'fill:#000000;stroke:none')
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marker.append(arrow)
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def makeGroup(self):
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'''puts everything of the dimensioning in a group'''
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layer = self.svg.get_current_layer()
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# Group in which the object should be put into
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grp_name = 'dimensioning'
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grp_attributes = {inkex.addNS('label', 'inkscape') : grp_name}
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self.grp = etree.SubElement(layer, 'g', grp_attributes)
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def getPoints(self):
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self.p1 = np.array([0.,100.])
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self.p1 = np.array([100.,100.])
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# Get variables of a selected object
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for id, node in self.svg.selected.items():
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# if it is a path:
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if node.tag == inkex.addNS('path', 'svg'):
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d = node.get('d')
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p = paths.CubicSuperPath(d)
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# p has all nodes with the anchor points in a list;
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# the rule is [anchorpoint, node, anchorpoint]
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# the points are lists with x and y coordinate
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self.p1 = np.array(p[0][0][1])
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self.p2 = np.array(p[0][-1][1])
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def calcab(self):
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# get p1,p2 ordered for correct dimension direction
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# determine quadrant
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if self.p1[0] <= self.p2[0]:
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if self.p1[1] <= self.p2[1]:
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quad = 1 # p1 is left,up of p2
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else: quad = 2 # p1 is left,down of p2
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elif self.p1[1] <= self.p2[1]:
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quad = 3 # p1 is right,up of p2
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else: quad = 4 # p1 is right,down of p2
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swap = False if quad ==1 else True
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minp = self.p2 if swap else self.p1
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maxp = self.p1 if swap else self.p2
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# distance between points
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delta = maxp - minp
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# rotation matrix
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rotateMat = np.array([[0,-1],[1,0]])
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# compute the unit vectors e1 and e2 along the cartesian coordinates of the dimension
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if self.options.orientation == 'horizontal':
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if quad == 3: self.e1 = np.array([1.0, 0.0])
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else: self.e1 = np.array([-1.0, 0.0])
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if self.options.orientation == 'vertical':
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if quad == 2:
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self.e1 = np.array([0.0, -1.0])
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else: self.e1 = np.array([0.0, 1.0])
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if self.options.orientation == 'parallel':
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self.e1 = norm(delta)
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#if quad==2 or quad==3: self.e1 *= -1
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self.e2 = np.dot(rotateMat, self.e1)
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if self.options.flip:
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self.e2 *= -1.
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# compute the points a and b, where the dimension line arrow spikes start and end
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dist = self.options.position*self.e2
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if self.options.flip:
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outpt = maxp
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delta *= -1
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if swap:
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self.a = outpt + dist
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self.b = self.a + self.e1*np.dot(self.e1,delta)
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else:
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self.b = outpt + dist
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self.a = self.b + self.e1*np.dot(self.e1,delta)
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else:
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outpt = minp
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if swap:
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self.b = outpt + dist
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self.a = self.b + self.e1*np.dot(self.e1,delta)
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else:
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self.a = outpt + dist
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self.b = self.a + self.e1*np.dot(self.e1,delta)
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def drawHelpline(self):
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# manipulate the start- and endpoints with distance and overlap
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h1_start = self.p1 + norm(self.a - self.p1)*self.options.distance
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h1_end = self.a + norm(self.a - self.p1)*self.options.overlap
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h2_start = self.p2 + norm(self.b - self.p2)*self.options.distance
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h2_end = self.b + norm(self.b - self.p2)*self.options.overlap
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# print the lines
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hline1 = etree.SubElement(self.grp, inkex.addNS('path', 'svg'), self.helpline_attribs)
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hline1.set('d', 'M %f,%f %f,%f' % (h1_start[0], h1_start[1],h1_end[0],h1_end[1],))
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hline2 = etree.SubElement(self.grp, inkex.addNS('path', 'svg'), self.helpline_attribs)
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hline2.set('d', 'M %f,%f %f,%f' % (h2_start[0], h2_start[1],h2_end[0],h2_end[1],))
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def setMarker(self, option):
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if option=='inside':
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# inside
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self.arrowlen = 6.0 * self.options.line_scale
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self.dimline_style['marker-start'] = 'url(#ArrowDIN-start)'
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self.dimline_style['marker-end'] = 'url(#ArrowDIN-end)'
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self.makeMarkerstyle('ArrowDIN-start', False)
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self.makeMarkerstyle('ArrowDIN-end', True)
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else:
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# outside
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self.arrowlen = 0
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self.dimline_style['marker-start'] = 'url(#ArrowDINout-start)'
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self.dimline_style['marker-end'] = 'url(#ArrowDINout-end)'
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self.makeMarkerstyle('ArrowDINout-start', False)
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self.makeMarkerstyle('ArrowDINout-end', True)
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self.dimline_attribs['style'] = str(inkex.Style(self.dimline_style))
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def drawDimension(self):
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# critical length, when inside snaps to outside
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critical_length = 35 * self.options.line_scale
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if self.options.arrow_orientation == 'auto':
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if np.abs(np.dot(self.e1, self.b - self.a)) > critical_length:
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self.setMarker('inside')
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else:
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self.setMarker('outside')
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else:
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self.setMarker(self.options.arrow_orientation)
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# start- and endpoint of the dimension line
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dim_start = self.a + self.arrowlen*norm(self.b - self.a)
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dim_end = self.b - self.arrowlen*norm(self.b - self.a)
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# print
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dimline = etree.SubElement(self.grp, inkex.addNS('path', 'svg'), self.dimline_attribs)
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dimline.set('d', 'M %f,%f %f,%f' % (dim_start[0], dim_start[1], dim_end[0], dim_end[1]))
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def drawText(self):
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# distance of text to the dimension line
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self.textdistance = 5.0 * self.options.line_scale
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if self.e2[1] > 0:
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textpoint = (self.a + self.b)/2 - self.e2*self.textdistance
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elif self.e2[1] == 0:
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textpoint = (self.a + self.b)/2 - np.array([1,0])*self.textdistance
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else:
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textpoint = (self.a + self.b)/2 + self.e2*self.textdistance
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value = np.abs(np.dot(self.e1, self.b - self.a)) / (self.svg.unittouu(str(self.options.scale_factor)+self.options.unit))
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string_value = str(round(value, self.options.digit))
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# chop off last characters if digit is zero or negative
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if self.options.digit <=0:
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string_value = string_value[:-2]
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text = etree.SubElement(self.grp, inkex.addNS('text', 'svg'), self.text_attribs)
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# The alternative for framing with dollars, when LATEX Math export is seeked
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# text.text = '$' + string_value + '$'
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text.text = string_value
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text.set('x', str(textpoint[0]))
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text.set('y', str(textpoint[1]))
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if self.options.rotate:
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text.set('transform', rotate(self.e1, textpoint))
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if __name__ == '__main__':
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Dimensioning().run()
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