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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(m[1])
this.g = parseInt(m[2])
this.b = parseInt(m[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 (SVG.regex.isHsb.test(color)) {
/* get hsb values */
match = SVG.regex.hsb.exec(color.replace(/\s/g,''))
/* convert hsb to rgb */
color = this._hsbToRgb(match[1], match[2], match[3])
}
} else if (typeof color == 'object') {
if (SVG.Color.isHsb(color))
color = this._hsbToRgb(color.h, color.s, color.b)
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)
}
// Private: convert hsb to rgb
, _hsbToRgb: function(h, s, v) {
var vs, vsf
/* process hue */
h = parseInt(h) % 360
if (h < 0) h += 360
/* process saturation */
s = parseInt(s)
s = s > 100 ? 100 : s
/* process brightness */
v = parseInt(v)
v = (v < 0 ? 0 : v > 100 ? 100 : v) * 255 / 100
/* compile rgb */
vs = v * s / 100
vsf = (vs * ((h * 256 / 60) % 256)) / 256
switch (Math.floor(h / 60)) {
case 0:
r = v
g = v - vs + vsf
b = v - vs
break
case 1:
r = v - vsf
g = v
b = v - vs
break
case 2:
r = v - vs
g = v
b = v - vs + vsf
break
case 3:
r = v - vs
g = v - vsf
b = v
break
case 4:
r = v - vs + vsf
g = v - vs
b = v
break
case 5:
r = v
g = v - vs
b = v - vsf
break
}
/* parse values */
return {
r: Math.floor(r + 0.5)
, g: Math.floor(g + 0.5)
, b: Math.floor(b + 0.5)
}
}
// 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)
|| SVG.regex.isHsb.test(color)
}
// Test if given value is a rgb object
SVG.Color.isRgb = function(color) {
return typeof color.r == 'number'
}
// Test if given value is a hsb object
SVG.Color.isHsb = function(color) {
return typeof color.h == 'number'
}
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