svg-cairo-ps

svg-cairo-ps

This is a small library to normalise SVG paths use cairo convert to PostScript (ps), Encapsulated PostScript (eps), PDF, SVG, PNG.

Note: this package works with path data strings, Cairo and CairoSVG, not with full svg xml sources.

Install

npm install svg-cairo-ps

By default, binaries for macOS, Linux and Windows will be downloaded. If you want to build from source, use npm install --build-from-source and see the Compiling section below.

The minimum version of Node.js required is 6.0.0.

Compiling

If you don't have a supported OS or processor architecture, or you use --build-from-source, the module will be compiled on your system. This requires several dependencies, including Cairo and Pango.

For detailed installation information, reference material the wiki. One-line installation instructions for common OSes are below.

OS	Command
OS X	Using Homebrew: brew install pkg-config cairo libpng jpeg
Ubuntu	sudo apt-get install build-essential libcairo2-dev libjpeg-dev libpng-dev
Fedora	sudo yum install gcc-c++ cairo-devel libjpeg-turbo-devel
Solaris	pkgin install cairo pkg-config xproto renderproto kbproto xextproto
OpenBSD	doas pkg_add cairo png jpeg
Windows	Reference material the wiki
Others	Reference material the wiki

Mac OS X v10.11+: If you have recently updated to Mac OS X v10.11+ and are experiencing trouble when compiling, run the following command: xcode-select --install. Read more about the problem on Stack Overflow. If you have xcode 10.0 or higher installed, in order to build from source you need NPM 6.4.1 or higher.

Note the setting pkg-config Pkg-config environment variable, export PKG_CONFIG_PATH="/usr/local/opt/libffi/lib/pkgconfig".

Explain

// cairo_move_to   cairo_rel_move_to ()   => M/m
// cairo_line_to   cairo_rel_line_to ()   => L/l、 H/h、V/v
// 弧形 cairo_arc()   cairo_arc_negative ()    => A/r
// 贝塞尔曲线 cairo_curve_to()   cairo_rel_curve_to ()    => C/c、Q/q、T/t、S/s
// cairo_close_path()   => Z/z

Example

const Parse = require('svg-cairo-ps')
const { pathParse, serializePath } = require('svg-path-parse')
 
// cairo_move_to   cairo_rel_move_to ()   => M/m
// cairo_line_to   cairo_rel_line_to ()   => L/l、 H/h、V/v
// 弧形 cairo_arc()   cairo_arc_negative ()    => A/r
// 贝塞尔曲线 cairo_curve_to()   cairo_rel_curve_to ()    => C/c、Q/q、T/t、S/s
// cairo_close_path()   => Z/z
 
// support svg, png, PostScript(ps), Encapsulated PostScript(eps), pdf
const command = 'M10 80 Q 52.5 10, 95 80 T 180 80'
 
const pathDatas = pathParse(command).absCairo({
  round: 2
})
 
const pathDat = pathParse('M230 230A 45 45, 0, 1, 1, 275 275L 275 230 Z').absCairo({
  round: 2
})
const { segments } = pathDatas
// console.log('pathDatas', serializePath(pathDatas))
// console.error('segments', segments)
 
Parse('test.eps', {
  paths: [
    {
      d: segments,
      // support fill, stroke, stroke-width, stroke-linecap, fill-rule
      attributes: {
        fill: 'red',
        'fill-rule': 'nonzero',
        stroke: '#000',
        'stroke-width': 2,
        'stroke-linecap': 'butt'
      }
    }
  ],
  size: 1024
})

 
// data construct
{
    d: [
      {
        "type": "M",
        "args": [
          971.55,
          361.72
        ]
      },
      {
        "type": "L",
        "args": [
          811.71,
          361.72
        ]
      },
      {
        "type": "L",
        "args": [
          811.71,
          311.37
        ]
      },
      {
        "type": "L",
        "args": [
          921.18,
          311.37
        ]
      },
      {
        "type": "A",
        "args": [
          39.96,
          39.96,
          0,
          0,
          0,
          961.14,
          271.41
        ]
      },
      {
        "type": "L",
        "args": [
          961.14,
          102.8
        ]
      },
      {
        "type": "A",
        "args": [
          39.96,
          39.96,
          0,
          0,
          0,
          921.18,
          62.86
        ]
      },
      {
        "type": "L",
        "args": [
          102.82,
          62.86
        ]
      }
    ]
}
 

License

MIT

注意， relcairo 存在问题