Comparing version 1.8.0 to 1.8.1-pre.4
{ | ||
"name": "viz.js", | ||
"version": "1.8.0", | ||
"version": "1.8.1-pre.4", | ||
"description": "A hack to put Graphviz on the web.", | ||
@@ -16,3 +16,4 @@ "main": "viz.js", | ||
"viz.js", | ||
"viz-lite.js" | ||
"viz-lite.js", | ||
"index.d.ts" | ||
], | ||
@@ -29,3 +30,7 @@ "browser": { | ||
}, | ||
"homepage": "https://github.com/mdaines/viz.js" | ||
"homepage": "https://github.com/mdaines/viz.js", | ||
"devDependencies": { | ||
"minimist": "^1.2.0", | ||
"selenium-webdriver": "^2.45.1" | ||
} | ||
} |
# Viz.js | ||
This project is a Makefile for building [Graphviz](http://www.graphviz.org) with [Emscripten](http://kripken.github.io/emscripten-site/) and a simple wrapper for using it in the browser. | ||
[![Build Status](https://travis-ci.org/mdaines/viz.js.svg?branch=master)](https://travis-ci.org/mdaines/viz.js) | ||
This project builds [Graphviz](http://www.graphviz.org) with [Emscripten](http://kripken.github.io/emscripten-site/) and provides a simple wrapper for using it in the browser. | ||
## Become a Patron | ||
Help make Viz.js better by [supporting me on Patreon](https://patreon.com/mdaines). Thank you! | ||
[Support Viz.js development](https://patreon.com/mdaines) for as little as $1 a month. ❤️ | ||
@@ -19,82 +21,20 @@ ## Getting Viz.js | ||
Or download the `viz.js` "binary" from the [releases page](https://github.com/mdaines/viz.js/releases). | ||
Or get it from the [releases page](https://github.com/mdaines/viz.js/releases). | ||
## "Lite" Version | ||
### "Lite" Version | ||
A smaller version of Viz.js can be downloaded from the [releases page](https://github.com/mdaines/viz.js/releases) and is available in the Bower package. `viz-lite.js` omits Expat and the NEATO layout plugin. | ||
A smaller version of Viz.js is available on the [releases page](https://github.com/mdaines/viz.js/releases) and the Bower package. `viz-lite.js` omits Expat and the NEATO layout plugin. | ||
## API | ||
## Usage | ||
### Viz(src, options={ format="svg", engine="dot", scale, images=[{ path, width, height }], totalMemory=16777216 }) | ||
Rendering a graph as SVG: | ||
- `src` is a string representing the graph to render in the [DOT language](http://www.graphviz.org/content/dot-language). | ||
- `options` | ||
- `format` sets the output format, and may be one of `"svg"`, `"xdot"`, `"plain"`, `"ps"`, `"json"`, or `"png-image-element"`. | ||
- `engine` sets the Graphviz engine to use, and may be one of `"circo"`, `"dot"`, `"neato"`, `"osage"`, or `"twopi"`. | ||
- `scale` sets the scale factor for the `"png-image-element"` format. If this is not specified, `window.devicePixelRatio` will be used if available, and `1` if not. | ||
- `images` specifies image dimensions to use when rendering nodes with `image` attributes. This is an array of objects, `{ href, width, height }`. `href` may be a filename (`"example.png"`), a relative or absolute path (`"/images/example.png"`), or a URL (`"http://example.com/image.png"`). Dimensions may be specified with units: in, px, pc, pt, cm, or mm. If no units are given or dimensions are given as numbers, points (pt) are used. Graphviz does not actually load image data when this option is used — images are referenced with the dimensions given, eg, in SVG by an `<image>` element with `width` and `height` attributes. | ||
- `totalMemory` sets the total memory available for the Emscripten module instance. This should be a power of 2. The default of 16MB should be sufficient for most cases — only consider using a larger number if you run into the error "Cannot enlarge memory arrays". | ||
var svg = Viz("digraph { a -> b; }"); | ||
Parses `src` and renders a graph according to the `options` given. Output is a string, except when using the "png-image-element" format, when it is an instance of HTMLImageElement. | ||
The input to `Viz()` is a graph in the [DOT language](http://www.graphviz.org/content/dot-language). The output `svg` is an SVG XML string. | ||
For example: | ||
For more information, see the [API documentation](https://github.com/mdaines/viz.js/wiki/API). | ||
result = Viz("digraph { a -> b; }"); | ||
result = Viz("digraph { a -> b; }", { format: "png-image-element", scale: 2 }); | ||
result = Viz("graph { n0 -- n1 -- n2 -- n3 -- n0; }", { engine: "neato" }); | ||
result = Viz("digraph { x -> y -> z; }", { format: "plain" }); | ||
result = Viz("digraph { a[image=\"test.png\"]; }", { images: [ { path: "test.png", width: "400px", height: "300px" } ] }); | ||
## Building Viz.js | ||
If Graphviz encounters an error, Viz will throw an `Error` object with the error message. | ||
### Viz.svgXmlToPngImageElement(svgXml[, scale[, callback]]) | ||
- `svgXml` is an SVG XML string, as may be obtained from the `Viz` function using the `"svg"` format option. | ||
- `scale` sets the scale factor for the output. If this is not specified, `window.devicePixelRatio` will be used if available, and `1` if not. | ||
- `callback` is an optional Node-style callback. If specified, it is given two arguments, `(err, image)`. If not specified, `Viz.svgXmlToPngImageElement` returns an instance of HTMLImageElement. | ||
Converts `svgXml` to a PNG HTMLImageElement. If `callback` is specfied, `image` is loaded by the time the callback is invoked. | ||
### Viz.svgXmlToPngBase64(svgXml, scale, callback) | ||
- `svgXml` is an SVG XML string, as may be obtained from the `Viz` function using the `"svg"` format option. | ||
- `scale` sets the scale factor for the output. If this is given as `undefined`, `window.devicePixelRatio` will be used if available, and `1` if not. | ||
- `callback` is a Node-style callback. It is given two arguments, `(err, data)`. | ||
Converts `svgXml` to a PNG represented as a Base64 string. This function requires a callback, unlike `svgXmlToPngImageElement`. | ||
## Supported Graphviz features | ||
These engines are supported: | ||
- circo | ||
- dot | ||
- fdp | ||
- neato | ||
- osage | ||
- twopi | ||
These formats are supported: | ||
- svg | ||
- xdot | ||
- plain | ||
- ps | ||
- json | ||
## PNG output | ||
Viz.js provides the `"png-image-element"` format in addition to the regular Graphviz formats. This returns an `HTMLImageElement` which can be inserted into the document. | ||
image = Viz("digraph g { a -> b; }", { format: "png-image-element" }); | ||
document.body.appendChild(image); | ||
However, this won't work in a Web Worker context. In that case, ask for the `"svg"` format in the worker and convert using the accessory function `Viz.svgXmlToPngImageElement` in the window context. See tests/png.js for an example. | ||
### Internet Explorer support | ||
Internet Explorer 10 and 11 require [Fabric.js](http://fabricjs.com) as an optional dependency for PNG output. Viz.js will look for a `fabric` object as a member of the global object with a `loadSVGFromString()` function and use that if present. | ||
## Build | ||
To build from source, you will need to [install the Emscripten SDK](http://kripken.github.io/emscripten-site/docs/getting_started/index.html). | ||
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