openlayers madness

public/lib/Rico/Color.js

@@ -0,0 +1,232 @@
+Rico.Color = Class.create();
+
+Rico.Color.prototype = {
+
+   initialize: function(red, green, blue) {
+      this.rgb = { r: red, g : green, b : blue };
+   },
+
+   setRed: function(r) {
+      this.rgb.r = r;
+   },
+
+   setGreen: function(g) {
+      this.rgb.g = g;
+   },
+
+   setBlue: function(b) {
+      this.rgb.b = b;
+   },
+
+   setHue: function(h) {
+
+      // get an HSB model, and set the new hue...
+      var hsb = this.asHSB();
+      hsb.h = h;
+
+      // convert back to RGB...
+      this.rgb = Rico.Color.HSBtoRGB(hsb.h, hsb.s, hsb.b);
+   },
+
+   setSaturation: function(s) {
+      // get an HSB model, and set the new hue...
+      var hsb = this.asHSB();
+      hsb.s = s;
+
+      // convert back to RGB and set values...
+      this.rgb = Rico.Color.HSBtoRGB(hsb.h, hsb.s, hsb.b);
+   },
+
+   setBrightness: function(b) {
+      // get an HSB model, and set the new hue...
+      var hsb = this.asHSB();
+      hsb.b = b;
+
+      // convert back to RGB and set values...
+      this.rgb = Rico.Color.HSBtoRGB( hsb.h, hsb.s, hsb.b );
+   },
+
+   darken: function(percent) {
+      var hsb  = this.asHSB();
+      this.rgb = Rico.Color.HSBtoRGB(hsb.h, hsb.s, Math.max(hsb.b - percent,0));
+   },
+
+   brighten: function(percent) {
+      var hsb  = this.asHSB();
+      this.rgb = Rico.Color.HSBtoRGB(hsb.h, hsb.s, Math.min(hsb.b + percent,1));
+   },
+
+   blend: function(other) {
+      this.rgb.r = Math.floor((this.rgb.r + other.rgb.r)/2);
+      this.rgb.g = Math.floor((this.rgb.g + other.rgb.g)/2);
+      this.rgb.b = Math.floor((this.rgb.b + other.rgb.b)/2);
+   },
+
+   isBright: function() {
+      var hsb = this.asHSB();
+      return this.asHSB().b > 0.5;
+   },
+
+   isDark: function() {
+      return ! this.isBright();
+   },
+
+   asRGB: function() {
+      return "rgb(" + this.rgb.r + "," + this.rgb.g + "," + this.rgb.b + ")";
+   },
+
+   asHex: function() {
+      return "#" + this.rgb.r.toColorPart() + this.rgb.g.toColorPart() + this.rgb.b.toColorPart();
+   },
+
+   asHSB: function() {
+      return Rico.Color.RGBtoHSB(this.rgb.r, this.rgb.g, this.rgb.b);
+   },
+
+   toString: function() {
+      return this.asHex();
+   }
+
+};
+
+Rico.Color.createFromHex = function(hexCode) {
+  if(hexCode.length==4) {
+    var shortHexCode = hexCode; 
+    var hexCode = '#';
+    for(var i=1;i<4;i++) hexCode += (shortHexCode.charAt(i) + 
+shortHexCode.charAt(i));
+  }
+   if ( hexCode.indexOf('#') == 0 )
+      hexCode = hexCode.substring(1);
+   var red   = hexCode.substring(0,2);
+   var green = hexCode.substring(2,4);
+   var blue  = hexCode.substring(4,6);
+   return new Rico.Color( parseInt(red,16), parseInt(green,16), parseInt(blue,16) );
+}
+
+/**
+ * Factory method for creating a color from the background of
+ * an HTML element.
+ */
+Rico.Color.createColorFromBackground = function(elem) {
+
+   var actualColor = RicoUtil.getElementsComputedStyle($(elem), "backgroundColor", "background-color");
+
+   if ( actualColor == "transparent" && elem.parentNode )
+      return Rico.Color.createColorFromBackground(elem.parentNode);
+
+   if ( actualColor == null )
+      return new Rico.Color(255,255,255);
+
+   if ( actualColor.indexOf("rgb(") == 0 ) {
+      var colors = actualColor.substring(4, actualColor.length - 1 );
+      var colorArray = colors.split(",");
+      return new Rico.Color( parseInt( colorArray[0] ),
+                            parseInt( colorArray[1] ),
+                            parseInt( colorArray[2] )  );
+
+   }
+   else if ( actualColor.indexOf("#") == 0 ) {
+      return Rico.Color.createFromHex(actualColor);
+   }
+   else
+      return new Rico.Color(255,255,255);
+}
+
+Rico.Color.HSBtoRGB = function(hue, saturation, brightness) {
+
+   var red   = 0;
+    var green = 0;
+    var blue  = 0;
+
+   if (saturation == 0) {
+      red = parseInt(brightness * 255.0 + 0.5);
+       green = red;
+       blue = red;
+    }
+    else {
+      var h = (hue - Math.floor(hue)) * 6.0;
+      var f = h - Math.floor(h);
+      var p = brightness * (1.0 - saturation);
+      var q = brightness * (1.0 - saturation * f);
+      var t = brightness * (1.0 - (saturation * (1.0 - f)));
+
+      switch (parseInt(h)) {
+         case 0:
+            red   = (brightness * 255.0 + 0.5);
+            green = (t * 255.0 + 0.5);
+            blue  = (p * 255.0 + 0.5);
+            break;
+         case 1:
+            red   = (q * 255.0 + 0.5);
+            green = (brightness * 255.0 + 0.5);
+            blue  = (p * 255.0 + 0.5);
+            break;
+         case 2:
+            red   = (p * 255.0 + 0.5);
+            green = (brightness * 255.0 + 0.5);
+            blue  = (t * 255.0 + 0.5);
+            break;
+         case 3:
+            red   = (p * 255.0 + 0.5);
+            green = (q * 255.0 + 0.5);
+            blue  = (brightness * 255.0 + 0.5);
+            break;
+         case 4:
+            red   = (t * 255.0 + 0.5);
+            green = (p * 255.0 + 0.5);
+            blue  = (brightness * 255.0 + 0.5);
+            break;
+          case 5:
+            red   = (brightness * 255.0 + 0.5);
+            green = (p * 255.0 + 0.5);
+            blue  = (q * 255.0 + 0.5);
+            break;
+        }
+    }
+
+   return { r : parseInt(red), g : parseInt(green) , b : parseInt(blue) };
+}
+
+Rico.Color.RGBtoHSB = function(r, g, b) {
+
+   var hue;
+   var saturation;
+   var brightness;
+
+   var cmax = (r > g) ? r : g;
+   if (b > cmax)
+      cmax = b;
+
+   var cmin = (r < g) ? r : g;
+   if (b < cmin)
+      cmin = b;
+
+   brightness = cmax / 255.0;
+   if (cmax != 0)
+      saturation = (cmax - cmin)/cmax;
+   else
+      saturation = 0;
+
+   if (saturation == 0)
+      hue = 0;
+   else {
+      var redc   = (cmax - r)/(cmax - cmin);
+        var greenc = (cmax - g)/(cmax - cmin);
+        var bluec  = (cmax - b)/(cmax - cmin);
+
+        if (r == cmax)
+           hue = bluec - greenc;
+        else if (g == cmax)
+           hue = 2.0 + redc - bluec;
+      else
+           hue = 4.0 + greenc - redc;
+
+        hue = hue / 6.0;
+        if (hue < 0)
+           hue = hue + 1.0;
+   }
+
+   return { h : hue, s : saturation, b : brightness };
+}
+