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Viewing file:     color.js (2.57 KB)      -rwxrwxr-x

// Module for color convertions
SVG.Color = function(color) {
  var match
  
  // initialize defaults 
  this.r = 0
  this.g = 0
  this.b = 0
  
  if(!color) return
  
  // parse color 
  if (typeof color === 'string') {
    if (SVG.regex.isRgb.test(color)) {
      // get rgb values 
      match = SVG.regex.rgb.exec(color.replace(SVG.regex.whitespace,''))
      
      // 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(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 '#'
      + compToHex(this.r)
      + compToHex(this.g)
      + 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)
    })
  }
  
})

// Testers

// 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)
}