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SVG Gradient Generation Support #33

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SVG Gradient Generation Support #33

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9180de3
Added SVG Gradient Generation Support
mhemesath Jul 31, 2011
e412869
Added gradient formats config options.
mhemesath Aug 5, 2011
5b56afb
added gradient template
mhemesath Aug 5, 2011
6b3f403
SVG gradients support size. Updated gradient tests to only output CSS…
mhemesath Aug 12, 2011
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16 changes: 8 additions & 8 deletions lib/nib.js
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Original file line number Diff line number Diff line change
Expand Up @@ -12,16 +12,13 @@
var stylus = require('stylus')
, nodes = stylus.nodes
, utils = stylus.utils
, gradient
, gradient = require('./nodes/gradient')
, Canvas;

exports = module.exports = plugin;

// conditionally expose gradient api

try {
require('canvas');
gradient = require('./nodes/gradient');
Canvas = require('canvas');
} catch (err) {
// ignore
}
Expand All @@ -48,10 +45,13 @@ exports.path = __dirname;
function plugin() {
return function(style){
style.include(__dirname);
if (gradient) {
style.define('create-gradient-image', gradient.create)
style.define('create-gradient-image', gradient.create)
style.define('gradient-svg-data-uri', gradient.svgDataURL)
style.define('add-color-stop', gradient.addColorStop)
style.define('set-gradient-size', gradient.setSize)

if (Canvas) {
style.define('gradient-data-uri', gradient.dataURL)
style.define('add-color-stop', gradient.addColorStop)
style.define('has-canvas', nodes.true);
} else {
style.define('has-canvas', nodes.false);
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6 changes: 6 additions & 0 deletions lib/nib/config.styl
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Expand Up @@ -10,3 +10,9 @@ support-for-ie = true
*/

vendor-prefixes ?= webkit moz official

/*
* Default vendor prefixes.
*/

gradient-formats = png svg css
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?=

only assigns if not already defined

82 changes: 52 additions & 30 deletions lib/nib/gradients.styl
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,25 @@ join-stops(stops, translate)
str += translate(color, pos)
unquote(str)


/*
* Build a linear gradient object with the given start position
* and variable number of color stops.
*/

build-gradient(start, stops)
stops = stops[0] if length(stops) == 1
if start[0] is a 'unit'
size = start[0]
start = start[1] or 'top'
else
start = start[0]
grad = create-gradient-image(start)
set-gradient-size(grad, size) if size is a 'unit'
stops = normalize-stops(stops)
add-color-stop(grad, stop[0], stop[1]) for stop in stops
grad

/*
* Legacy Webkit color stop.
*/
Expand Down Expand Up @@ -101,46 +120,49 @@ std-stop(color, pos)
*
*/

linear-gradient(start, stops...)
linear-gradient(start, stops..., formats=gradient-formats)
error('color stops required') unless length(stops)
prop = current-property[0]
val = current-property[1]
stops = normalize-stops(stops)

// gradient image
if start[0] is a 'unit'
if has-canvas
img = linear-gradient-image(start, stops)
add-property(prop, replace(val, '__CALL__', img))
start = start[1]

// legacy webkit
end = grad-point(opposite-position(start))
webkit-legacy = '-webkit-gradient(linear, %s, %s, %s)' % (grad-point(start) end join-stops(stops, webkit-stop))
add-property(prop, replace(val, '__CALL__', webkit-legacy))

// vendor prefixed
stops = join-stops(stops, std-stop)
for prefix in vendor-prefixes
unless prefix == official
gradient = '-%s-linear-gradient(%s, %s)' % (prefix start stops)
add-property(prop, replace(val, '__CALL__', gradient))

// standard
'linear-gradient(%s, %s)' % (start stops)

// gradient png image
if png in formats and start[0] is a 'unit'
img = linear-gradient-image(start, stops)
add-property(prop, replace(val, '__CALL__', img))

// gradient svg image
if svg in formats
img = linear-gradient-svg(start, stops)
add-property(prop, replace(val, '__CALL__', img))

if css in formats
start = start[1] if start[0] is a 'unit'
// legacy webkit
end = grad-point(opposite-position(start))
webkit-legacy = '-webkit-gradient(linear, %s, %s, %s)' % (grad-point(start) end join-stops(stops, webkit-stop))
add-property(prop, replace(val, '__CALL__', webkit-legacy))

// vendor prefixed
stops = join-stops(stops, std-stop)
for prefix in vendor-prefixes
unless prefix == official
gradient = '-%s-linear-gradient(%s, %s)' % (prefix start stops)
add-property(prop, replace(val, '__CALL__', gradient))

// standard
'linear-gradient(%s, %s)' % (start stops)

/*
* Create a linear gradient image with the given start position
* and variable number of color stops.
*/

linear-gradient-image(start, stops...)
error('node-canvas is required for linear-gradient-image()') unless has-canvas
stops = stops[0] if length(stops) == 1
error('gradient image size required') unless start[0] is a 'unit'
size = start[0]
start = start[1] or 'top'
grad = create-gradient-image(size, start)
stops = normalize-stops(stops)
add-color-stop(grad, stop[0], stop[1]) for stop in stops
grad = build-gradient(start, stops)
'url(%s)' % gradient-data-uri(grad)

linear-gradient-svg(start, stops...)
grad = build-gradient(start, stops)
'url(%s)' % gradient-svg-data-uri(grad)
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