svg转png插件saveSvgAsPng

# saveSvgAsPng ## Installation ``` npm install save-svg-as-png ``` ## Usage To save a PNG, include the script `saveSvgAsPng.js` in your page, then call the `saveSvgAsPng` function with an SVG node and a filename: ```javascript saveSvgAsPng(document.getElementById("diagram"), "diagram.png"); ``` The filename is the preferred filename when saving the image to the file system. The browser may change the name of the file if there is already a file by that name in the target directory. If you want to scale the image up or down, you can pass a scale factor in an options object: ```javascript saveSvgAsPng(document.getElementById("diagram"), "diagram.png", {scale: 0.5}); ``` Other options are documented below. If you just want a dataURI for an SVG, you can call `svgAsDataUri` with an SVG node, options, and a callback: ```javascript svgAsDataUri(document.getElementById("diagram"), {}, function(uri) { ... }); ``` If you want a dataURI of a PNG generated from an SVG, you can call `svgAsPngUri` with an SVG node, options, and a callback: ```javascript svgAsPngUri(document.getElementById("diagram"), {}, function(uri) { ... }); ``` Compatible with [browserify](http://browserify.org/) and [requirejs](http://requirejs.org). If you want to use TypeScript, necessary [type definitions](https://github.com/martianov/typed-save-svg-as-png) are available in [Typings](https://github.com/typings/typings) [public registry](https://github.com/typings/registry). ### Options - `backgroundColor` — Creates a PNG with the given background color. Defaults to transparent. - `left` - Specify the viewbox's left position. Defaults to 0. - `height` - Specify the image's height. Defaults to the viewbox's height if given, or the element's non-percentage height, or the element's bounding box's height, or the element's CSS height, or the computed style's height, or 0. - `scale` — Changes the resolution of the output PNG. Defaults to `1`, the same dimensions as the source SVG. - `selectorRemap` — A function that takes a CSS selector and produces its replacement in the CSS that's inlined into the SVG. Useful if your SVG style selectors are scoped by ancestor elements in your HTML document. - `modifyStyle` - A function that takes CSS styles and returns replacement styles. - `top` - Specify the viewbox's top position. Defaults to 0. - `width` - Specify the image's width. Defaults to the viewbox's width if given, or the element's non-percentage width, or the element's bounding box's width, or the element's CSS width, or the computed style's width, or 0. - `encoderType` - A DOMString indicating the image format. The default type is image/png. - `encoderOptions` - A Number between 0 and 1 indicating image quality. The default is 0.8 - `canvg` - If canvg is passed in, it will be used to write svg to canvas. This will allow support for Internet Explorer ### Testing run tests with [tape](https://www.npmjs.com/package/tape) ```bash npm test ``` ## Support [Chrome limits data URIs to 2MB](http://stackoverflow.com/questions/695151/data-protocol-url-size-limitations/41755526#41755526), so you may have trouble generating PNGs beyod a certain size. Internet Explorer will only work if [canvg](https://github.com/canvg/canvg) is passed in, otherwise it will throw a `SecurityError` when calling `toDataURL` on a canvas that's been written to. [canvg](https://github.com/canvg/canvg) may have it's own issues with SVG support, so ensure you test the output after switching.