Reworked color management

1 files changed, 165 insertions, 0 deletions

diff --git a/src/color.js b/src/color.js
new file mode 100644
index 0000000..dde2c65
--- /dev/null
+++ b/src/color.js
@@ -0,0 +1,165 @@
+// 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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