Added Guitar Fretboard extension
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extensions/fablabchemnitz/fretboard.inx
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extensions/fablabchemnitz/fretboard.inx
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<?xml version="1.0" encoding="UTF-8"?>
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<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
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<name>Guitar Fretboard</name>
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<id>fablabchemnitz.de.guitar_fretboard</id>
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<param name="scale" type="string" gui-text="Scalelenght:">25.00in</param>
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<param name="lnut" type="string" gui-text="Width at Nut:">43mm</param>
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<param name="l12" type="string" gui-text="Width at fret 12:">53mm</param>
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<param name="numfret" type="int" min="1" max="36" _gui-text="Number of frets:">22</param>
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<param name="fbext" type="string" gui-text="Extension below last fret:">8mm</param>
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<param name="fretwidth" type="string" gui-text="Fret Width:">2mm</param>
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<effect>
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<object-type>all</object-type>
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<effects-menu>
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<submenu name="FabLab Chemnitz">
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<submenu name="Dimensioning/Measuring"/></submenu>
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</effects-menu>
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</effect>
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<script>
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<command location="inx" interpreter="python">fretboard.py</command>
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</script>
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</inkscape-extension>
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extensions/fablabchemnitz/fretboard.py
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extensions/fablabchemnitz/fretboard.py
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#! /usr/bin/env python
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'''
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MIT License
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Copyright (c) 2021 Christophe Grellier
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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'''
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__version__ = "0.1"
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import inkex
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from lxml import etree
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class Fretboard:
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def __init__(self, scale=635.0):
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self.scale = scale
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self.nb_frets = 24
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self.fret_width = 2.0
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self.width_nut = 43.0
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self.width_12 = 53.0
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self.extension = 8.0
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def fret_distance_bridge(self, fret):
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return self.scale / pow(2.0, (fret / 12.0))
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def fret_distance_nut(self, fret):
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return self.scale - self.fret_distance_bridge(fret)
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def fb_lenght(self):
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return self.fret_distance_nut(self.nb_frets) + self.extension
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def fb_width_at(self, dist):
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return self.width_nut + 2.0 * (self.width_12 - self.width_nut) * dist / self.scale
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def fret_bounds(self, fret):
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distup = self.fret_distance_nut(fret) - self.fret_width / 2.0
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distdown = self.fret_distance_nut(fret) + self.fret_width / 2.0
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width_up = self.fb_width_at(distup)
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width_down = self.fb_width_at(distdown)
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return distup, distdown, width_up, width_down
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def svg_polyline(self, pts, closed=False):
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svg = ""
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for pt in pts:
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svg += "L {},{} ".format(pt[0], pt[1])
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svg = "M" + svg[1:]
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if closed:
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svg += "Z"
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return svg
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def svg_contour(self):
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lfb = self.fb_lenght()
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lowwidth = self.fb_width_at(lfb)
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pts = [(-self.width_nut / 2.0, 0),
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(self.width_nut / 2.0, 0),
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(lowwidth / 2.0, lfb),
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(-lowwidth / 2.0, lfb)]
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return self.svg_polyline(pts, True)
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def svg_h_line(self, width, y):
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pts = [(-width / 2.0, y),
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(width / 2.0, y)]
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return self.svg_polyline(pts)
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def svg_fret_centerline(self, fret):
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dist = self.fret_distance_nut(fret)
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return self.svg_h_line(self.fb_width_at(dist), dist)
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def svg_fret_contour(self, fret):
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distup, distdown, width_up, width_down = self.fret_bounds(fret)
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pts = [(-width_up / 2.0, distup),
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(width_up / 2.0, distup),
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(width_down / 2.0, distdown),
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(-width_down / 2.0, distdown)]
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return self.svg_polyline(pts, True)
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def svg_fret_end(self, fret, side=1.0):
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distup, distdown, width_up, width_down = self.fret_bounds(fret)
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return 'M {},{} C {},{} {},{} {},{} Z'.format(side * width_up / 2.0, distup,
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side * width_up / 2.0 - side * self.fret_width / 2.0, distup,
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side * width_down / 2.0 - side * self.fret_width / 2.0, distdown,
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side * width_down / 2.0, distdown)
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def svg_fret_cross(self, fret):
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upperfretpos = self.fret_distance_nut(fret - 1)
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lowerfretpos = self.fret_distance_nut(fret)
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markerpos = upperfretpos + (lowerfretpos - upperfretpos) / 2.0
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hline_cross_path = 'M {},{} L {},{}'.format(-self.fb_width_at(markerpos) / 2.0, markerpos,
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self.fb_width_at(markerpos) / 2.0, markerpos)
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vline_cross_path = ' M {},{} L {},{}'.format(0, upperfretpos,
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0, lowerfretpos)
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return hline_cross_path, vline_cross_path
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class Inxfb(inkex.Effect):
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def __init__(self):
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inkex.Effect.__init__(self)
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self.arg_parser.add_argument("-s", "--scale", default="25in", help="The fingerboard scalelenght")
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self.arg_parser.add_argument("-w", "--lnut", default="43mm", help="The fingerboard width at nut")
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self.arg_parser.add_argument("-x", "--l12", default="53mm", help="The fingerboard width at fret 12")
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self.arg_parser.add_argument("-n", "--numfret", type=int, default=22, help="Number of frets")
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self.arg_parser.add_argument("-e", "--fbext", default="8mm", help="Lenght of the fingerboard extension below last fret")
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self.arg_parser.add_argument("-f", "--fretwidth", default="2mm", help="Fret Width")
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def effect(self):
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svg = self.document.getroot()
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# ************ Layer 1 Definition ***************
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layer = etree.SubElement(svg, 'g')
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layer.set(inkex.addNS('label', 'inkscape'), 'Fretboard')
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layer.set(inkex.addNS('groupmode', 'inkscape'), 'layer')
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# ************ Layer 2 Definition ***************
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layer2 = etree.SubElement(svg, 'g')
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layer2.set(inkex.addNS('label', 'inkscape'), 'Fret positions')
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layer2.set(inkex.addNS('groupmode', 'inkscape'), 'layer')
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# ************ Group Definitions ***************
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fb_id = svg.get_unique_id('fretboard')
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self.box = g = etree.SubElement(layer, 'g', {'id': fb_id})
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fp_id = svg.get_unique_id('fret-positions')
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self.box2 = g3 = etree.SubElement(layer2, 'g', {'id': fp_id})
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fm_id = svg.get_unique_id('fretmarkers')
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self.box4 = g4 = etree.SubElement(layer2, 'g', {'id': fm_id})
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# ************ Style Definition ***************
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fill_black_style = str(inkex.Style({'stroke': 'none', 'fill': '#222222'}))
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fill_grey_style = str(inkex.Style({'stroke': 'none', 'fill': '#aaaaaa'}))
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fill_lightgrey_style = str(inkex.Style({'stroke': 'none', 'fill': '#dddddd'}))
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stroke_black_style = str(inkex.Style({'stroke': '#000000', 'fill': 'none'}))
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stroke_red_style = str(inkex.Style({'stroke': '#ff0000', 'fill': 'none'}))
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text_style = "font-family:DejaVu Sans;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;fill:#000000;fill-opacity:1;stroke:none;font-size:10px;"
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text_attributes = {'x': '12mm', 'y': '10mm', inkex.addNS("space", "xml"): "preserve", 'style': text_style}
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text = "Scalelenght : {}\n".format(self.options.scale)
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text += "Nut width : {}\n".format(self.options.lnut)
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text += "12th fret width : {}\n".format(self.options.l12)
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text += "Number of frets : {}\n".format(self.options.numfret)
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text += "Extension below last fret : {}\n".format(self.options.fbext)
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text += "Fret width : {}".format(self.options.fretwidth)
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fretboard = Fretboard(svg.unittouu(str(self.options.scale)))
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fretboard.width_nut = svg.unittouu(str(self.options.lnut))
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fretboard.width_12 = svg.unittouu(str(self.options.l12))
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fretboard.extension = svg.unittouu(str(self.options.fbext))
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fretboard.nb_frets = self.options.numfret
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fretboard.fret_width = svg.unittouu(str(self.options.fretwidth))
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fb_body_path = fretboard.svg_contour()
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nut_line = fretboard.svg_fret_centerline(0)
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bridge_line = fretboard.svg_h_line(fretboard.fb_width_at(fretboard.scale), fretboard.scale)
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# ************ Apply style to objects ***************
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fb_body_object = {'style': fill_black_style, 'id': fb_id + '-shape', 'd': fb_body_path}
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nut_line_object = {'style': stroke_black_style, 'id': 'fret-0', 'd': nut_line}
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bridge_line_object = {'style': stroke_black_style, 'id': 'bridge-line', 'd': bridge_line}
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# ************ Add objects to groups ***************
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etree.SubElement(g, inkex.addNS('path', 'svg'), fb_body_object)
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etree.SubElement(g, inkex.addNS('path', 'svg'), bridge_line_object)
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etree.SubElement(g3, inkex.addNS('path', 'svg'), bridge_line_object)
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etree.SubElement(g3, inkex.addNS('path', 'svg'), nut_line_object)
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t = etree.SubElement(layer2, inkex.addNS('text', 'svg'), text_attributes)
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text = str(text).split("\n")
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y = 100
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for s in text:
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span = etree.SubElement(t, inkex.addNS('tspan', 'svg'),
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{'x': '12', 'y': str(y),
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inkex.addNS("role", "sodipodi"): "line", })
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y += 24
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span.text = str(s)
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for index in range(1, self.options.numfret + 1):
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linefret_path = fretboard.svg_fret_centerline(index)
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fretpos_id = svg.get_unique_id('fretpos-' + str(index))
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linefret_atts = {'style': stroke_black_style, 'id': fretpos_id, 'd': linefret_path}
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etree.SubElement(g3, inkex.addNS('path', 'svg'), linefret_atts)
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line_path = fretboard.svg_fret_contour(index)
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curve_path = fretboard.svg_fret_end(index, 1.0)
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curve_path2 = fretboard.svg_fret_end(index, -1.0)
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fret_id = svg.get_unique_id('fret-' + str(index))
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self.fret = g2 = etree.SubElement(self.box, 'g', {'id': fret_id})
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fretbody_id = svg.get_unique_id('fret-' + str(index) + '-body')
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fretend_id1 = svg.get_unique_id('fret-' + str(index) + '-end1')
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fretend_id2 = svg.get_unique_id('fret-' + str(index) + '-end2')
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line_atts = {'style': fill_grey_style, 'id': fretbody_id, 'd': line_path}
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curve_atts = {'style': fill_lightgrey_style, 'id': fretend_id1, 'd': curve_path}
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curve2_atts = {'style': fill_lightgrey_style, 'id': fretend_id2, 'd': curve_path2}
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etree.SubElement(g2, inkex.addNS('path', 'svg'), line_atts)
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etree.SubElement(g2, inkex.addNS('path', 'svg'), curve_atts)
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etree.SubElement(g2, inkex.addNS('path', 'svg'), curve2_atts)
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# ************ Add inlay cross ***************
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val = index % 12
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if val in [0, 3, 5, 7, 9]:
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hline_cross_path, vline_cross_path = fretboard.svg_fret_cross(index)
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fretpos_id = svg.get_unique_id('marker-cross-' + str(index))
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hline_atts = {'style': stroke_red_style, 'id': fretpos_id, 'd': hline_cross_path}
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vline_atts = {'style': stroke_red_style, 'id': fretpos_id, 'd': vline_cross_path}
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etree.SubElement(g4, inkex.addNS('path', 'svg'), hline_atts)
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etree.SubElement(g4, inkex.addNS('path', 'svg'), vline_atts)
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if __name__ == '__main__':
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Inxfb().run()
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Reference in New Issue
Block a user