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# svg-pathdata
> Manipulate SVG path data (path[d] attribute content) simply and efficiently.
[![NPM version](https://badge.fury.io/js/svg-pathdata.svg)](https://npmjs.org/package/svg-pathdata)
[![Run tests](https://github.com/nfroidure/svg-pathdata/actions/workflows/test.yml/badge.svg)](https://github.com/nfroidure/svg-pathdata/actions/workflows/test.yml)
[![Dependency Status](https://david-dm.org/nfroidure/svg-pathdata.svg)](https://david-dm.org/nfroidure/svg-pathdata)
[![devDependency Status](https://david-dm.org/nfroidure/svg-pathdata/dev-status.svg)](https://david-dm.org/nfroidure/svg-pathdata#info=devDependencies)
[![Coverage Status](https://coveralls.io/repos/nfroidure/svg-pathdata/badge.svg?branch=master)](https://coveralls.io/r/nfroidure/svg-pathdata?branch=master)
[![Code Climate](https://codeclimate.com/github/nfroidure/svg-pathdata.svg)](https://codeclimate.com/github/nfroidure/svg-pathdata)
[![Dependency Status](https://dependencyci.com/github/nfroidure/svg-pathdata/badge)](https://dependencyci.com/github/nfroidure/svg-pathdata)
## Usage
Install the module:
```sh
npm install --save svg-pathdata
```
or add the [bundle](https://github.com/nfroidure/svg-pathdata/blob/master/lib/SVGPathData.js) to a script in your HTML.
Then in your JavaScript files:
```js
const {SVGPathData, SVGPathDataTransformer, SVGPathDataEncoder, SVGPathDataParser} = require('svg-pathdata');
```
With import syntax in TypeScript/ES6:
```ts
import {SVGPathData, SVGPathDataTransformer, SVGPathDataEncoder, SVGPathDataParser} from 'svg-pathdata';
```
Without modules, using the global in the bundle:
```js
const {SVGPathData, SVGPathDataTransformer, SVGPathDataEncoder, SVGPathDataParser} = svgpathdata;
```
## Reading PathData
```js
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 PathData in chunks
```js
const parser = new SVGPathDataParser();
parser.parse(' '); // returns []
parser.parse('M 10'); // returns []
parser.parse(' 10'); // returns [{type: SVGPathData.MOVE_TO, relative: false, x: 10, y: 10 }]
parser.write('H 60'); // returns [{type: SVGPathData.HORIZ_LINE_TO, relative: false, x: 60 }]
parser.write('V'); // returns []
parser.write('60'); // returns [{type: SVGPathData.VERT_LINE_TO, relative: false, y: 60 }]
parser.write('L 10 60 \n Z');
// returns [
// {type: SVGPathData.LINE_TO, relative: false, x: 10, y: 60 },
// {type: SVGPathData.CLOSE_PATH }]
parser.finish(); // tell parser there is no more data: will throw if there are unfinished commands.
```
## Outputting PathData
```js
const pathData = new SVGPathData (`
M 10 10
H 60
V 60
L 10 60
Z`);
// returns "M10 10H60V60L10 60Z"
encodeSVGPath({ type: SVGPathData.MOVE_TO, relative: false, x: 10, y: 10 });
// returns "M10 10"
encodeSVGPath({ type: SVGPathData.HORIZ_LINE_TO, relative: false, x: 60 });
// returns "H60"
encodeSVGPath([
{ type: SVGPathData.VERT_LINE_TO, relative: false, y: 60 },
{ type: SVGPathData.LINE_TO, relative: false, x: 10, y: 60 },
{ type: SVGPathData.CLOSE_PATH}])
// returns "V60L10 60Z"
```
## Transforming PathData
This library can perform transformations on SVG paths. Here is
[an example of that kind of use](https://github.com/nfroidure/svgicons2svgfont/blob/aa6df0211419e9d61c417c63bcc353f0cb2ea0c8/src/index.js#L192).
### Transforming entire paths
```js
new SVGPathData (`
m 10,10
h 60
v 60
l 10,60
z`)
.toAbs()
.encode();
// return s"M10,10 H70 V70 L80,130 Z"
```
### Transforming partial data
Here, we take SVGPathData from stdin and output it transformed to stdout.
```js
const transformingParser = new SVGPathDataParser().toAbs().scale(2, 2);
transformingParser.parse('m 0 0') // returns [{ type: SVGPathData.MOVE_TO, relative: false, x: 0, y: 0 }]
transformingParser.parse('l 2 3') // returns [{ type: SVGPathData.LINE_TO, relative: false, x: 4, y: 6 }]
```
## Supported transformations
You can find all supported transformations in
[src/SVGPathDataTransformer.ts](https://github.com/nfroidure/SVGPathData/blob/master/src/SVGPathDataTransformer.ts#L47).
Additionally, you can create your own by writing a function with the following signature:
```js
type TransformFunction = (command: SVGCommand) => SVGCommand | SVGCommand[];
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();
// Chunk usage
new SVGPathDataParser().transform(SET_X_TO(25));
```
## Stats
[![NPM](https://nodei.co/npm/svg-pathdata.png?downloads=true&stars=true)](https://nodei.co/npm/svg-pathdata/)
[![NPM](https://nodei.co/npm-dl/svg-pathdata.png)](https://nodei.co/npm/svg-pathdata/)
## Contributing
Clone this project, run:
```sh
npm install; npm test
```
# License
[MIT](https://github.com/nfroidure/svg-pathdata/blob/master/LICENSE)