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// Module for color convertions
SVG.Color = function(color) {
var match
/* initialize defaults */
this.r = 0
this.g = 0
this.b = 0
/* parse color */
if (typeof color == 'string') {
if (SVG.regex.isRgb.test(color)) {
/* get rgb values */
match = SVG.regex.rgb.exec(color.replace(/\s/g,''))
/* parse numeric values */
this.r = parseInt(match[1])
this.g = parseInt(match[2])
this.b = parseInt(match[3])
} else if (SVG.regex.isHex.test(color)) {
/* get hex values */
match = SVG.regex.hex.exec(this._fullHex(color))
/* parse numeric values */
this.r = parseInt(match[1], 16)
this.g = parseInt(match[2], 16)
this.b = parseInt(match[3], 16)
}
} else if (typeof color == 'object') {
this.r = color.r
this.g = color.g
this.b = color.b
}
}
SVG.extend(SVG.Color, {
// Default to hex conversion
toString: function() {
return this.toHex()
}
// Build hex value
, toHex: function() {
return '#'
+ this._compToHex(this.r)
+ this._compToHex(this.g)
+ this._compToHex(this.b)
}
// Build rgb value
, toRgb: function() {
return 'rgb(' + [this.r, this.g, this.b].join() + ')'
}
// Calculate true brightness
, brightness: function() {
return (this.r / 255 * 0.30)
+ (this.g / 255 * 0.59)
+ (this.b / 255 * 0.11)
}
// Make color morphable
, morph: function(color) {
this.destination = new SVG.Color(color)
return this
}
// Get morphed color at given position
, at: function(pos) {
/* make sure a destination is defined */
if (!this.destination) return this
/* normalise pos */
pos = pos < 0 ? 0 : pos > 1 ? 1 : pos
/* generate morphed color */
return new SVG.Color({
r: ~~(this.r + (this.destination.r - this.r) * pos)
, g: ~~(this.g + (this.destination.g - this.g) * pos)
, b: ~~(this.b + (this.destination.b - this.b) * pos)
})
}
// Private: ensure to six-based hex
, _fullHex: function(hex) {
return hex.length == 4 ?
[ '#',
hex.substring(1, 2), hex.substring(1, 2)
, hex.substring(2, 3), hex.substring(2, 3)
, hex.substring(3, 4), hex.substring(3, 4)
].join('') : hex
}
// Private: component to hex value
, _compToHex: function(comp) {
var hex = comp.toString(16)
return hex.length == 1 ? '0' + hex : hex
}
})
// Test if given value is a color string
SVG.Color.test = function(color) {
color += ''
return SVG.regex.isHex.test(color)
|| SVG.regex.isRgb.test(color)
}
// Test if given value is a rgb object
SVG.Color.isRgb = function(color) {
return color && typeof color.r == 'number'
&& typeof color.g == 'number'
&& typeof color.b == 'number'
}
// Test if given value is a color
SVG.Color.isColor = function(color) {
return SVG.Color.isRgb(color) || SVG.Color.test(color)
}
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