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