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svgToPdf.js
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svgToPdf.js
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/*
* svgToPdf.js
*
* Copyright 2012-2014 Florian Hülsmann <[email protected]>
* Copyright 2014 Ben Gribaudo <www.bengribaudo.com>
*
* This script is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This script 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this file. If not, see <http://www.gnu.org/licenses/>.
*
*/
'use strict';
global.window = {document: {createElementNS: () => {return {}} }};
global.navigator = {};
global.btoa = () => {};
const jsPDF = require('jspdf');
var pdfSvgAttr = {
// allowed attributes. all others are removed from the preview.
g: ['stroke', 'fill', 'stroke-width'],
line: ['x1', 'y1', 'x2', 'y2', 'stroke', 'stroke-width'],
rect: ['x', 'y', 'width', 'height', 'stroke', 'fill', 'stroke-width'],
ellipse: ['cx', 'cy', 'rx', 'ry', 'stroke', 'fill', 'stroke-width'],
circle: ['cx', 'cy', 'r', 'stroke', 'fill', 'stroke-width'],
text: ['x', 'y', 'font-size', 'font-family', 'text-anchor', 'font-weight', 'font-style', 'fill'],
path: ['d', 'stroke', 'fill', 'stroke-width']
};
var removeAttributes = function(node, attributes) {
attributes.forEach(attrib => {
node.removeAttribute(attrib);
});
}
var parseNumbers = function(data) {
let numbers = /[, ]? *(-?[0-9]*[.]?[0-9]+)/g;
let rv = [];
let result;
while ((result = numbers.exec(data)) !== null) {
rv.push(parseFloat(result[1]));
}
return rv;
}
var svgElementToPdf = function(element, pdf, options) {
// pdf is a jsPDF object
var remove = (typeof(options.removeInvalid) == 'undefined' ? false : options.removeInvalid);
var k = (typeof(options.scale) == 'undefined' ? 1.0 : options.scale);
var colorMode = null;
var error = "";
Array.from(element.children).forEach(function(node, i) {
var hasFillColor = false;
var hasStrokeColor = false;
if (['g','line','rect','ellipse','circle','text','path'].includes(node.localName)) {
var fillColor = node.getAttribute('fill');
if(fillColor != null) {
if (fillColor == 'context-fill') {
fillColor = 'black';
}
var fillRGB = new window.RGBColor(fillColor);
if(fillRGB.ok) {
hasFillColor = true;
colorMode = 'F';
} else {
colorMode = null;
}
}
}
if (['g','line','rect','ellipse','circle','path'].includes(node.localName)) {
if(hasFillColor) {
pdf.setFillColor(fillRGB.r, fillRGB.g, fillRGB.b);
}
if(node.getAttribute('stroke-width') != null) {
pdf.setLineWidth(k * parseInt(node.getAttribute('stroke-width')));
}
var strokeColor = node.getAttribute('stroke');
if(strokeColor != null) {
if (strokeColor == 'context-fill') {
strokeColor = 'black';
}
var strokeRGB = new window.RGBColor(strokeColor);
if(strokeRGB.ok) {
hasStrokeColor = true;
pdf.setDrawColor(strokeRGB.r, strokeRGB.g, strokeRGB.b);
if(colorMode == 'F') {
colorMode = 'FD';
} else {
colorMode = null;
}
} else {
colorMode = null;
}
}
}
switch(node.tagName.toLowerCase()) {
case 'svg':
case 'a':
case 'g':
let rv = svgElementToPdf(node, pdf, options);
removeAttributes(node, pdfSvgAttr.g);
if (!rv) {
error = "group error";
}
break;
case 'line':
pdf.line(
k*parseInt(node.getAttribute('x1')),
k*parseInt(node.getAttribute('y1')),
k*parseInt(node.getAttribute('x2')),
k*parseInt(node.getAttribute('y2'))
);
removeAttributes(node, pdfSvgAttr.line);
break;
case 'path':
let d = node.getAttribute('d');
const REGEX = /(?=[MmLlHhVvQqCcTtSsAaZz])/
let current = {x:0, y:0};
let firstPoint = null;
let controlPoint = null;
let closed = false;
let lines = [];
for (let part of d.split(REGEX)) {
let op = part[0];
part = part.slice(1);
switch (op) {
case 'M':
case 'm':
controlPoint = null;
part = parseNumbers(part);
let first = true;
while (part.length) {
let prev = {...current};
if (op == 'M') {
current = {x:0, y:0};
}
current.x += part[0];
current.y += part[1];
if (!firstPoint) {
firstPoint = {...current};
}
if (!first) {
lines.push([
current.x - prev.x,
current.y - prev.y
]);
}
first = false;
part = part.slice(2);
}
break;
case 'L':
case 'l':
controlPoint = null;
part = parseNumbers(part);
while (part.length) {
let prev = {...current};
if (op == 'L') {
current = {x:0, y:0};
}
current.x += part[0];
current.y += part[1];
lines.push([
current.x - prev.x,
current.y - prev.y
]);
part = part.slice(2);
}
break;
case 'H':
case 'h':
controlPoint = null;
part = parseNumbers(part);
while (part.length) {
let prev = {...current};
if (op == 'H') {
current.x = 0;
}
current.x += part.shift();
lines.push([current.x - prev.x, 0]);
}
break;
case 'V':
case 'v':
controlPoint = null;
part = parseNumbers(part);
while (part.length) {
let prev = {...current};
if (op == 'V') {
current.y = 0;
}
current.y += part.shift();
lines.push([0, current.y - prev.y]);
}
break;
case 'C':
case 'c':
part = parseNumbers(part);
while (part.length) {
let prev = {...current};
if (op == 'C') {
current = {x:0, y:0};
}
let cp1 = {
x: current.x + part[0],
y: current.y + part[1]
};
let cp2 = {
x: current.x + part[2],
y: current.y + part[3]
};
current.x += part[4];
current.y += part[5];
lines.push([
cp1.x - prev.x,cp1.y - prev.y,
cp2.x - prev.x,cp2.y - prev.y,
current.x - prev.x,current.y - prev.y
]);
controlPoint = {
x: 2*current.x - cp2.x,
y: 2*current.y - cp2.y
};
part = part.slice(6);
}
break;
case 'S':
case 's':
part = parseNumbers(part);
while (part.length) {
let prev = {...current};
if (!controlPoint) {
controlPoint = {...current};
}
if (op == 'S') {
current = {x:0, y:0};
}
let cp2 = {
x: current.x + part[0],
y: current.y + part[1]
};
current.x += part[2];
current.y += part[3];
lines.push([
controlPoint.x - prev.x,controlPoint.y - prev.y,
cp2.x - prev.x,cp2.y - prev.y,
current.x - prev.x,current.y - prev.y
])
controlPoint = {
x: 2*current.x - cp2.x,
y: 2*current.y - cp2.y
};
part = part.slice(4);
}
break;
case 'Z':
case 'z':
closed = true;
break;
case 'A':
case 'a':
part = parseNumbers(part);
while (part.length) {
let prev = {...current};
current.x += part[5];
current.y += part[6];
let q = Math.sqrt(
(current.x - prev.x) * (current.x - prev.x) +
(current.y - prev.y) * (current.y - prev.y)
);
let mid = Math.sqrt(Math.abs(part[0] * part[0] - q * q / 4));
let x = (current.x + prev.x) / 2 + mid * (current.y - prev.y) / q;
let y = (current.y + prev.y) / 2 + mid * (current.x - prev.x) / q;
pdf.ellipse(x, y, part[0], part[1], colorMode);
lines.push([
current.x - prev.x,current.y - prev.y
]);
controlPoint = null;
part = part.slice(7);
}
break;
case 'Q':
case 'q':
case 'T':
case 't':
default:
error += `Can't translate to pdf: ${op + part}\n`;
break;
}
}
pdf.lines(
lines,
firstPoint.x,
firstPoint.y,
[k,k], colorMode, closed
);
removeAttributes(node, pdfSvgAttr.path);
break;
case 'rect':
pdf.rect(
k*parseInt(node.getAttribute('x')),
k*parseInt(node.getAttribute('y')),
k*parseInt(node.getAttribute('width')),
k*parseInt(node.getAttribute('height')),
colorMode
);
removeAttributes(node, pdfSvgAttr.rect);
break;
case 'ellipse':
pdf.ellipse(
k*parseInt(node.getAttribute('cx')),
k*parseInt(node.getAttribute('cy')),
k*parseInt(node.getAttribute('rx')),
k*parseInt(node.getAttribute('ry')),
colorMode
);
removeAttributes(node, pdfSvgAttr.ellipse);
break;
case 'circle':
pdf.circle(
k*parseInt(node.getAttribute('cx')),
k*parseInt(node.getAttribute('cy')),
k*parseInt(node.getAttribute('r')),
colorMode
);
removeAttributes(node, pdfSvgAttr.circle);
break;
case 'text':
if(node.hasAttribute('font-family')) {
switch(node.getAttribute('font-family').toLowerCase()) {
case 'serif': pdf.setFont('times'); break;
case 'monospace': pdf.setFont('courier'); break;
default:
node.getAttribute('font-family', 'sans-serif');
pdf.setFont('helvetica');
}
}
if(hasFillColor) {
pdf.setTextColor(fillRGB.r, fillRGB.g, fillRGB.b);
}
var fontType = "";
if(node.hasAttribute('font-weight')) {
if(node.getAttribute('font-weight') == "bold") {
fontType = "bold";
} else {
node.removeAttribute('font-weight');
}
}
if(node.hasAttribute('font-style')) {
if(node.getAttribute('font-style') == "italic") {
fontType += "italic";
} else {
node.removeAttribute('font-style');
}
}
pdf.setFontType(fontType);
var pdfFontSize = 16;
if(node.hasAttribute('font-size')) {
pdfFontSize = parseInt(node.getAttribute('font-size'));
}
var box = node.getBBox();
//FIXME: use more accurate positioning!!
var x, y, xOffset = 0;
if(node.hasAttribute('text-anchor')) {
switch(node.getAttribute('text-anchor')) {
case 'end': xOffset = box.width; break;
case 'middle': xOffset = box.width / 2; break;
case 'start': break;
case 'default': node.getAttribute('text-anchor', 'start');
}
x = parseInt(node.getAttribute('x')) - xOffset;
y = parseInt(node.getAttribute('y'));
}
//console.log("fontSize:", pdfFontSize, "text:", n.text());
pdf.setFontSize(pdfFontSize).text(
k * x,
k * y,
node.text()
);
removeAttributes(node, pdfSvgAttr.text);
break;
//TODO: image
default:
if (remove) {
console.log("can't translate to pdf:", node ? node.localName : 'unknown');
node.remove();
}
}
});
if (error) {
console.log(error);
return null;
}
return pdf;
};
jsPDF.API.addSVG = function(element, x, y, options) {
'use strict'
options = (typeof(options) == 'undefined' ? {} : options);
options.x_offset = x;
options.y_offset = y;
let rv = svgElementToPdf(element, this, options);
if (!rv) {
return null;
}
return this;
};
var svgToPdf = function (svg) {
let width = parseInt(svg.getAttribute('width'), 10);
let height = parseInt(svg.getAttribute('height'), 10);
var pdf = new jsPDF('p', 'px', 'a4');
let rv = svgElementToPdf(svg, pdf, {
scale: 1, // this is the ratio of px to pt units
removeInvalid: true // this removes elements that could not be translated to pdf from the source svg
});
if (!rv) {
return null;
}
return pdf.output();
}
module.exports = svgToPdf;