#!/usr/bin/env python3 ''' Copyright (C) 2017 Artem Synytsyn a.synytsyn@gmail.com #TODO: Code cleaning and refactoring This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. ''' import inkex from lxml import etree from math import * class KnobScale(inkex.EffectExtension): def add_arguments(self, pars): # General settings pars.add_argument("--x", type=float, default=0.0, help="Center X") pars.add_argument("--y", type=float, default=0.0, help="Center Y") pars.add_argument("--radius", type=float, default=100.0, help="Knob radius") pars.add_argument("--linewidth", type=float, default=1) pars.add_argument("--angle", type=float, default=260.0, help="Angle of the knob scale in degrees") pars.add_argument("--draw_arc", type=inkex.Boolean, default='True') pars.add_argument("--draw_centering_circle", type=inkex.Boolean, default='False') pars.add_argument("--logarithmic_scale", type=inkex.Boolean, default='False', help="") pars.add_argument("-u", "--units", default="px", help="units to measure size of knob") # Tick settings pars.add_argument("--n_ticks", type=int, default=5) pars.add_argument("--ticksize", type=float, default=10) pars.add_argument("--n_subticks", type=int, default=10) pars.add_argument("--subticksize", type=float, default=5) pars.add_argument("--style", default='marks_outwards', help="Style of marks") # Label settings pars.add_argument("--labels_enabled", type=inkex.Boolean, default='False') pars.add_argument("--rounding_level", type=int, default=0) pars.add_argument("--text_size", type=float, default=1) pars.add_argument("--text_offset", type=float, default=20) pars.add_argument("--start_value", type=float, default=0) pars.add_argument("--stop_value", type=float, default=10) # Dummy pars.add_argument("--tab") def draw_text(self, textvalue, radius, angular_position, text_size, parent): # Create text element text = etree.Element(inkex.addNS('text','svg')) text.text = textvalue # Set text position to center of document. text.set('x', str(self.x_offset + radius*cos(angular_position))) text.set('y', str(self.y_offset + radius*sin(angular_position) + text_size/2)) # Center text horizontally with CSS style. style = { 'text-align' : 'center', 'text-anchor': 'middle', 'alignment-baseline' : 'center', 'font-size' : str(text_size), 'vertical-align' : 'middle' } text.set('style', str(inkex.Style(style))) parent.append(text) def draw_knob_arc(self, radius, parent, angle, transform='' ): start_point_angle = (angle - pi)/2.0 end_point_angle = pi - start_point_angle style = { 'stroke' : '#000000', 'stroke-width' : str(self.options.linewidth), 'fill' : 'none' } ell_attribs = {'style': str(inkex.Style(style)), inkex.addNS('cx','sodipodi') :str(self.x_offset), inkex.addNS('cy','sodipodi') :str(self.y_offset), inkex.addNS('rx','sodipodi') :str(radius), inkex.addNS('ry','sodipodi') :str(radius), inkex.addNS('start','sodipodi') :str(end_point_angle), inkex.addNS('end','sodipodi') :str(start_point_angle), inkex.addNS('open','sodipodi') :'true', #all ellipse sectors we will draw are open inkex.addNS('type','sodipodi') :'arc', 'transform' :transform } ell = etree.SubElement(parent, inkex.addNS('path','svg'), ell_attribs ) def draw_centering_circle(self, radius, parent): style = { 'stroke' : '#000000', 'stroke-width' : '1', 'fill' : 'none' } ell_attribs = {'style':str(inkex.Style(style)), inkex.addNS('cx','sodipodi') :str(self.x_offset), inkex.addNS('cy','sodipodi') :str(self.y_offset), inkex.addNS('rx','sodipodi') :str(radius), inkex.addNS('ry','sodipodi') :str(radius), inkex.addNS('type','sodipodi') :'arc' } ell = etree.SubElement(parent, inkex.addNS('path','svg'), ell_attribs ) def draw_circle_mark(self, x_offset, y_offset, radius, mark_angle, mark_length, parent): cx = x_offset + radius*cos(mark_angle) cy = y_offset + radius*sin(mark_angle) r = mark_length / 2.0 style = { 'stroke': '#000000', 'stroke-width':'0', 'fill': '#000000' } circ_attribs = { 'style':str(inkex.Style(style)), 'cx':str(cx), 'cy':str(cy), 'r':str(r) } circle = etree.SubElement(parent, inkex.addNS('circle','svg'), circ_attribs ) def draw_knob_line_mark(self, x_offset, y_offset, radius, mark_angle, mark_length, parent): x1 = x_offset + radius*cos(mark_angle) y1 = y_offset + radius*sin(mark_angle) x2 = x_offset + (radius + mark_length)*cos(mark_angle) y2 = y_offset + (radius + mark_length)*sin(mark_angle) line_style = { 'stroke': '#000000', 'stroke-width': str(self.options.linewidth), 'fill': 'none' } line_attribs = {'style' : str(inkex.Style(line_style)), inkex.addNS('label','inkscape') : "none", 'd' : 'M '+str(x1) +',' + str(y1) +' L '+str(x2) +','+str(y2) } line = etree.SubElement(parent, inkex.addNS('path','svg'), line_attribs ) def draw_tick(self, radius, mark_angle, mark_size, parent): if (self.options.style == 'marks_inwards') or (self.options.style == 'marks_outwards'): self.draw_knob_line_mark(self.x_offset, self.y_offset, radius, mark_angle, mark_size, parent) elif self.options.style == 'marks_circles': self.draw_circle_mark(self.x_offset, self.y_offset, radius, mark_angle, mark_size, parent) def effect(self): parent = self.svg.get_current_layer() radius = self.svg.unittouu(str(self.options.radius) + self.options.units) self.x_offset = self.svg.unittouu(str(self.options.x) + self.options.units) self.y_offset = self.svg.unittouu(str(self.options.y) + self.options.units) angle = self.options.angle*pi/180.0 n_ticks = self.options.n_ticks n_subticks = self.options.n_subticks is_outer = True if self.options.style == 'marks_inwards': is_outer = False tick_length = self.svg.unittouu(str(self.options.ticksize) + self.options.units) subtick_length = self.svg.unittouu(str(self.options.subticksize) + self.options.units) arc_radius = radius # Labeling settings start_num = self.options.start_value end_num = self.options.stop_value text_spacing = self.svg.unittouu(str(self.options.text_offset) + self.options.units) text_size = self.svg.unittouu(str(self.options.text_size) + self.options.units) if not is_outer: subtick_radius = radius + tick_length - subtick_length arc_radius = radius + tick_length else: subtick_radius = radius arc_radius = radius if self.options.draw_arc: self.draw_knob_arc(arc_radius, parent, angle) if self.options.draw_centering_circle: self.draw_centering_circle(arc_radius + tick_length + text_size + text_spacing, parent) if self.options.logarithmic_scale: start_ticks_angle = 1.5*pi - 0.5*angle for tick in range(n_ticks): self.draw_tick(radius, start_ticks_angle + angle*log(tick+1)/log(n_ticks), tick_length, parent) if self.options.labels_enabled: if self.options.rounding_level > 0: tick_text = str(round(start_num + float(tick) * (end_num - start_num) / (n_ticks - 1), self.options.rounding_level)) else: tick_text = str(int(start_num + float(tick) * (end_num - start_num) / (n_ticks - 1))) self.draw_text(tick_text, radius + tick_length + text_spacing, start_ticks_angle + angle*log(tick+1)/log(n_ticks), text_size, parent) if tick == (n_ticks - 1): break for subtick in range(n_subticks): self.draw_tick(subtick_radius, start_ticks_angle + angle*log(tick+1+(subtick+1)/(n_subticks+1))/log(n_ticks), subtick_length, parent) else: ticks_delta = angle / (n_ticks - 1) start_ticks_angle = 1.5*pi - 0.5*angle for tick in range(n_ticks): self.draw_tick(radius, start_ticks_angle + ticks_delta*tick, tick_length, parent) if self.options.labels_enabled: if self.options.rounding_level > 0: tick_text = str(round(start_num + float(tick) * (end_num - start_num) / (n_ticks - 1), self.options.rounding_level)) else: tick_text = str(int(start_num + float(tick) * (end_num - start_num) / (n_ticks - 1))) self.draw_text(tick_text, radius + tick_length + text_spacing, start_ticks_angle + ticks_delta*tick, text_size, parent) if tick == (n_ticks - 1): break subticks_delta = ticks_delta / (n_subticks + 1) subtick_start_angle = start_ticks_angle + ticks_delta*tick + subticks_delta for subtick in range(n_subticks): self.draw_tick(subtick_radius, subtick_start_angle + subticks_delta*subtick, subtick_length, parent) if __name__ == '__main__': e = KnobScale().run()