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SVG.Gradient = SVG.invent({
// Initialize node
create: function(type) {
this.constructor.call(this, SVG.create(type + 'Gradient'))
// store type
this.type = type
}
// Inherit from
, inherit: SVG.Container
// Add class methods
, extend: {
// Add a color stop
at: function(offset, color, opacity) {
return this.put(new SVG.Stop).update(offset, color, opacity)
}
// Update gradient
, update: function(block) {
// remove all stops
this.clear()
// invoke passed block
if (typeof block == 'function')
block.call(this, this)
return this
}
// Return the fill id
, fill: function() {
return 'url(#' + this.id() + ')'
}
// Alias string convertion to fill
, toString: function() {
return this.fill()
}
// custom attr to handle transform
, attr: function(a, b, c) {
if(a == 'transform') a = 'gradientTransform'
return SVG.Container.prototype.attr.call(this, a, b, c)
}
}
// Add parent method
, construct: {
// Create gradient element in defs
gradient: function(type, block) {
return this.defs().gradient(type, block)
}
}
})
// Add animatable methods to both gradient and fx module
SVG.extend(SVG.Gradient, SVG.FX, {
// From position
from: function(x, y) {
return (this._target || this).type == 'radial' ?
this.attr({ fx: new SVG.Number(x), fy: new SVG.Number(y) }) :
this.attr({ x1: new SVG.Number(x), y1: new SVG.Number(y) })
}
// To position
, to: function(x, y) {
return (this._target || this).type == 'radial' ?
this.attr({ cx: new SVG.Number(x), cy: new SVG.Number(y) }) :
this.attr({ x2: new SVG.Number(x), y2: new SVG.Number(y) })
}
})
// Base gradient generation
SVG.extend(SVG.Defs, {
// define gradient
gradient: function(type, block) {
return this.put(new SVG.Gradient(type)).update(block)
}
})
SVG.Stop = SVG.invent({
// Initialize node
create: 'stop'
// Inherit from
, inherit: SVG.Element
// Add class methods
, extend: {
// add color stops
update: function(o) {
if (typeof o == 'number' || o instanceof SVG.Number) {
o = {
offset: arguments[0]
, color: arguments[1]
, opacity: arguments[2]
}
}
// set attributes
if (o.opacity != null) this.attr('stop-opacity', o.opacity)
if (o.color != null) this.attr('stop-color', o.color)
if (o.offset != null) this.attr('offset', new SVG.Number(o.offset))
return this
}
}
})
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