prooof of concept
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src/octoprint/plugins/svgtogcode/static/js/extrude.js
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158
src/octoprint/plugins/svgtogcode/static/js/extrude.js
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// extrude.js - a snapsvg.io plugin to generate extrusion walls of svg paths.
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// Copyright (C) 2016 Teja Philipp <osd@tejaphilipp.de>
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//
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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 Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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Snap.plugin(function (Snap, Element, Paper, global) {
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/**
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* @param {elem} elem start point
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*
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* @returns {path}
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*/
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Element.prototype.extrude = function(height, perforation_curvature_threshold){
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var subdiv_length = 1;
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var material_thickness = 1;
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var perforation_curvature_threshold = perforation_curvature_threshold || 5;
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var elem = this;
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var walls = [];
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var children = elem.children();
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if (children.length > 0) {
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var goRecursive = (elem.type !== "defs" && // ignore these tags
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elem.type !== "clipPath" &&
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elem.type !== "metadata" &&
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elem.type !== "rdf:rdf" &&
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elem.type !== "cc:work" &&
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elem.type !== "sodipodi:namedview");
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if(goRecursive) {
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for (var i = 0; i < children.length; i++) {
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var child = children[i];
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var more = child.extrude(height);
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walls.push.apply(walls, more);
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}
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}
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} else {
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var e;
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if (elem.type !== "path"){
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console.log('converting element to path', elem.type);
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e = elem.toPath();
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} else {
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e = elem;
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}
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var dOriginal = e.attr('d');
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var parts = Snap.path.toRelative(dOriginal).toString();
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var segments = parts.split('m');
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console.log('d',dOriginal);
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for (var i = 0; i < segments.length; i++) {
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if(segments[i].trim() !== ''){
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var seg = 'M' + segments[i];
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var l = Snap.path.getTotalLength(seg);
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console.log("segment", seg, l);
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walls.push(createWrappingPath2(seg), height);
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}
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}
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//walls.push( createWrappingPath(segments, height));
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}
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return walls;
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};
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function createWrappingPath2(segment, height){
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var l = Snap.path.getTotalLength(segment);
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console.log(segment, l);
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// create "rectangle"
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var rect_d = "m0,0 l"+l+',0' // top
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+ ' l0,'+height // right
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+ ' l-'+l+',0' // bottom
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+ ' l0,-'+height; // left
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var perforations = getPerforations(segment, 5);
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var perf_d = [];
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for (var i = 0; i < perforations.length; i++) {
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var perf = perforations[i];
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var density = 0.8 * perf.curvature/90;
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perf_d.push(createVerticalPerforation(perf.loc,height,density, height/10));
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}
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return rect_d+perf_d.join(',');
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}
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function getPerforations(d, perf_curvature_threshold){
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var stepSize = 1;
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var perfs = [];
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var e = snap.path(d)
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var l = e.getTotalLength();
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var i = 0;
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var last_alpha = -999;
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var curvature_sum = 0;
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while(i<l){
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var p = e.getPointAtLength(i);
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p.curvature = last_alpha - p.alpha;
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p.loc = i;
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curvature_sum += p.curvature;
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last_alpha = p.alpha;
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if(Math.abs(curvature_sum) > perf_curvature_threshold){
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perfs.push({loc:i, curve:p.curvature});
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curvature_sum = 0;
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}
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i+=stepSize;
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}
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return perfs;
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}
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function createWrappingPath(divs, height){
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var upper_d = "M0,0";
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var lower_d = "M0,"+height;
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var verticals = ['M0,0l0,'+height];
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for (var i = 0; i < divs.length; i++) {
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var d = divs[i];
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var x = d.loc.toFixed(2);
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upper_d += 'L'+x+',0';
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lower_d += 'L'+x+','+height;
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var density = 0.8* d.curvature/180;
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verticals.push(createVerticalPerforation(x,height, density, height/15));
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}
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return upper_d+lower_d+verticals.join();
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}
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function createVerticalPerforation(x, height, density, perfLength){
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var cut = (perfLength * (density)).toFixed(2);
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var gap = (perfLength - cut).toFixed(2);
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var d = 'M'+x+',0';
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var y = 0;
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while(y < height){
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d += 'l0,'+cut+'m0,'+gap;
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y += perfLength;
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}
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return d;
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}
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});
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