An SVG renderer for the Prawn PDF library.
This will take an SVG document as input and render it into your PDF. Find out more about the Prawn PDF library at:
http://github.com/prawnpdf/prawn
prawn-svg is compatible with all versions of Prawn from 0.11.1 onwards, including the 1.x and 2.x series. The minimum Ruby version required is 2.7.
Prawn::Document.generate("test.pdf") do
svg '<svg><rect width="100" height="100" fill="red"></rect></svg>'
end
prawn-svg will do something sensible if you call it with only an SVG document, but you can also pass the following options to tailor its operation:
Option | Data type | Description |
---|---|---|
:at | [integer, integer] | Specify the location on the page you want the SVG to appear. |
:position | :left, :center, :right, integer | If :at not specified, specifies the horizontal position to show the SVG. Defaults to :left. |
:vposition | :top, :center, :bottom, integer | If :at not specified, specifies the vertical position to show the SVG. Defaults to current cursor position. |
:width | integer | Desired width of the SVG. Defaults to horizontal space available. |
:height | integer | Desired height of the SVG. Defaults to vertical space available. |
:enable_web_requests | boolean | If true, prawn-svg will make http and https requests to fetch images. Defaults to true. |
:enable_file_requests_with_root | string | If not nil, prawn-svg will serve file: URLs from your local disk if the file is located under the specified directory. It is very dangerous to specify the root path ("/") if you're not fully in control of your input SVG. Defaults to nil (off). |
:cache_images | boolean | If true, prawn-svg will cache the result of all URL requests. Defaults to false. |
:fallback_font_name | string | A font name which will override the default fallback font of Times-Roman. If this value is set to nil , prawn-svg will ignore a request for an unknown font and log a warning. |
:color_mode | :rgb, :cmyk | Output color mode. Defaults to :rgb. |
# Render the logo contained in the file logo.svg at 100, 100 with a width of 300
svg IO.read("logo.svg"), at: [100, 100], width: 300
# Render the logo at the current Y cursor position, centered in the current bounding box
svg IO.read("logo.svg"), position: :center
# Render the logo at the current Y cursor position, and serve file: links relative to its directory
root_path = "/apps/myapp/current/images"
svg IO.read("#{root_path}/logo.svg"), enable_file_requests_with_root: root_path
prawn-svg supports most but not all of the full SVG 1.1 specification. It currently supports:
<line>
, <polyline>
, <polygon>
, <circle>
and <ellipse>
<rect>
. Rounded rects are supported, but only one radius is applied to all corners.
<path>
supports all commands defined in SVG 1.1, although the
implementation of elliptical arc is a bit rough at the moment.
<text>
, <tspan>
and <tref>
with attributes x
, y
, dx
, dy
, rotate
, textLength
, lengthAdjust
,
and with extra properties text-anchor
, text-decoration
(underline only), font-size
, font-family
,
font-weight
, font-style
, letter-spacing
, dominant-baseline
(middle only)
<svg>
, <g>
and <symbol>
<use>
<style>
(see CSS section below)
<image>
referencing a JPEG, PNG, or SVG image, with http:
, https:
, data:image/jpeg;base64
,
data:image/png;base64
, data:image/svg+xml;base64
and file:
schemes (file:
is disabled by default for
security reasons, see Options section above)
<clipPath>
<marker>
<linearGradient>
and <radialGradient>
are implemented on Prawn 2.2.0+ with attributes gradientUnits
and
gradientTransform
(spreadMethod
and stop-opacity
are unimplemented.)
<switch>
and <foreignObject>
, although prawn-svg cannot handle any data that is not SVG so <foreignObject>
tags are always ignored.
properties: clip-path
, color
, display
, fill
, fill-opacity
, fill-rule
, opacity
, overflow
,
stroke
, stroke-dasharray
, stroke-linecap
, stroke-linejoin
, stroke-opacity
, stroke-width
properties on lines, polylines, polygons and paths: marker-end
, marker-mid
, marker-start
attributes on all elements: class
, id
, style
, transform
, xml:space
the viewBox
attribute on <svg>
and <marker>
elements
the preserveAspectRatio
attribute on <svg>
, <image>
and <marker>
elements
transform methods: translate
, translateX
, translateY
, rotate
, scale
, skewX
, skewY
, matrix
colors: HTML standard names, #xxx
, #xxxxxx
, rgb(1, 2, 3)
, rgb(1%, 2%, 3%)
, and also the non-standard
device-cmyk(1, 2, 3, 4)
for CMYK colors
measurements specified in pt
, cm
, dm
, ft
, in
, m
, mm
, yd
, pc
, %
fonts: generic CSS fonts, built-in PDF fonts, and any TTF fonts in your fonts path, specified in any of the
measurements above plus em
or rem
prawn-svg supports CSS, both in <style>
blocks and style
attributes.
In CSS selectors you can use element names, IDs, classes, attributes (existence, =
, ^=
, $=
, *=
, ~=
, |=
)
and all combinators (`,
>,
+,
~). The pseudo-classes
:first-child,
:last-childand
:nth-child(n)` (where n is a number) also work.
Pseudo-elements and the other pseudo-classes are not supported. Specificity ordering is
implemented, but !important
is not.
prawn-svg does not support hyperlinks, patterns, masks or filters.
It does not support text in the clip area, but you can clip shapes and text by any shape.
By default, prawn-svg has a fonts path of ["/Library/Fonts", "/System/Library/Fonts", "#{ENV["HOME"]}/Library/Fonts", "/usr/share/fonts/truetype"]
to catch MacOS and Debian Linux users. You can add
to the font path:
Prawn::SVG::FontRegistry.font_path << "/my/font/directory"
In your Gemfile, put gem 'prawn-svg'
before gem 'prawn-rails'
so that prawn-rails can see the prawn-svg extension.
MIT licence. Copyright Mog Nesbitt.