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svg-pathdata

svg-pathdata

Manipulate SVG path data (path[d] attribute content) simply and efficiently.

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Usage

Install the module:

npm install --save svg-pathdata

or add the bundle to a script in your HTML.

Then in your JavaScript files:

const {SVGPathData, SVGPathDataTransformer, SVGPathDataEncoder, SVGPathDataParser} = require('svg-pathdata');

With import syntax in TypeScript/ES6:

import {SVGPathData, SVGPathDataTransformer, SVGPathDataEncoder, SVGPathDataParser} from 'svg-pathdata';

Without modules, using the global in the bundle:

const {SVGPathData, SVGPathDataTransformer, SVGPathDataEncoder, SVGPathDataParser} = svgpathdata;

Reading PathData

const pathData = new SVGPathData (`
  M 10 10
  H 60
  V 60
  L 10 60
  Z`);
 
 
console.log(pathData.commands);
 
 
// [  {type: SVGPathData.MOVE_TO,       relative: false,  x: 10,  y: 10},
//    {type: SVGPathData.HORIZ_LINE_TO, relative: false,  x: 60},
//    {type: SVGPathData.VERT_LINE_TO,  relative: false,          y: 60},
//    {type: SVGPathData.LINE_TO,       relative: false,  x: 10,  y: 60},
//    {type: SVGPathData.CLOSE_PATH}]

Reading streamed PathData

const parser = new SVGPathDataParser();
parser.on('data', console.log);
 
parser.write('   ');
parser.write('M 10');
parser.write(' 10');
// {type: SVGPathData.MOVE_TO, relative: false, x: 10, y: 10 }
 
parser.write('H 60');
// {type: SVGPathData.HORIZ_LINE_TO, relative: false, x: 60 }
 
parser.write('V');
parser.write('60');
// {type: SVGPathData.VERT_LINE_TO, relative: false, y: 60 }
 
parser.write('L 10 60 \n  Z');
// {type: SVGPathData.LINE_TO, relative: false, x: 10, y: 60 }
// {type: SVGPathData.CLOSE_PATH }
 
parser.end();

Outputting PathData

const pathData = new SVGPathData (`
  M 10 10
  H 60
  V 60
  L 10 60
  Z`);
 
console.log(pathData.encode());
// "M10 10H60V60L10 60Z"

Streaming PathData out

const encoder = new SVGPathDataEncoder();
encoder.setEncoding('utf8');
 
encode.on('data', console.log(str));
 
encoder.write({ type: SVGPathData.MOVE_TO,       relative: false, x: 10, y: 10 });
// "M10 10"
 
encoder.write({ type: SVGPathData.HORIZ_LINE_TO, relative: false, x: 60 });
// "H60"
 
encoder.write({ type: SVGPathData.VERT_LINE_TO,  relative: false,        y: 60 });
// "V60"
 
encoder.write({ type: SVGPathData.LINE_TO,       relative: false, x: 10, y: 60 });
// "L10 60"
 
encoder.write({ type: SVGPathData.CLOSE_PATH});
// "Z"
 
encoder.end();

Transforming PathData

This library was made to live decoding/transform/encoding SVG PathData. Here is an example of that kind of use.

The synchronous way

console.log(
  new SVGPathData (`
   m 10,10
   h 60
   v 60
   l 10,60
   z`)
  .toAbs()
  .encode()
);
// "M10,10 H70 V70 L80,130 Z"

The streaming/asynchronous way

Here, we take SVGPathData from stdin and output it transformed to stdout.

// stdin to parser
process.stdin.pipe(new SVGPathDataParser())
// parser to transformer to absolute
  .pipe(new SVGPathDataTransformer(SVGPathData.Transformer.TO_ABS()))
// transformer to encoder
  .pipe(new SVGPathDataEncoder())
// encoder to stdout
  .pipe(process.stdout);

Supported transformations

You can find all supported transformations in src/SVGPathDataTransformer.js. Additionally, you can create your own using this format:

function SET_X_TO(xValue = 10) {
  return function(command) {
    command.x = xValue; // transform command objects and return them
    return command;
  };
};
 
// Synchronous usage
new SVGPathData('...')
  .transform(SET_X_TO(25))
  .encode();
 
// Streaming usage
process.stdin.pipe(new SVGPathDataParser())
  .pipe(new SVGPathDataTransformer(SET_X_TO(25)))
  .pipe(new SVGPathDataEncoder())
  .pipe(process.stdout);

Stats

NPM NPM

Contributing

Clone this project, run:

npm install; npm test

License

MIT