Struts example source code file (hsv.js)

This example Struts source code file (hsv.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

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The Struts hsv.js source code

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.gfx.color.hsv");
dojo.require("dojo.lang.array");
dojo.require("dojo.math");
dojo.lang.extend(dojo.gfx.color.Color, {toHsv:function () {
	return dojo.gfx.color.rgb2hsv(this.toRgb());
}});
dojo.gfx.color.rgb2hsv = function (r, g, b, options) {
	if (dojo.lang.isArray(r)) {
		if (g) {
			options = g;
		}
		b = r[2] || 0;
		g = r[1] || 0;
		r = r[0] || 0;
	}
	var opt = {inputRange:(options && options.inputRange) ? options.inputRange : 255, outputRange:(options && options.outputRange) ? options.outputRange : [255, 255, 255]};
	var h = null;
	var s = null;
	var v = null;
	switch (opt.inputRange) {
	  case 1:
		r = (r * 255);
		g = (g * 255);
		b = (b * 255);
		break;
	  case 100:
		r = (r / 100) * 255;
		g = (g / 100) * 255;
		b = (b / 100) * 255;
		break;
	  default:
		break;
	}
	var min = Math.min(r, g, b);
	v = Math.max(r, g, b);
	var delta = v - min;
	s = (v == 0) ? 0 : delta / v;
	if (s == 0) {
		h = 0;
	} else {
		if (r == v) {
			h = 60 * (g - b) / delta;
		} else {
			if (g == v) {
				h = 120 + 60 * (b - r) / delta;
			} else {
				if (b == v) {
					h = 240 + 60 * (r - g) / delta;
				}
			}
		}
		if (h <= 0) {
			h += 360;
		}
	}
	switch (opt.outputRange[0]) {
	  case 360:
		break;
	  case 100:
		h = (h / 360) * 100;
		break;
	  case 1:
		h = (h / 360);
		break;
	  default:
		h = (h / 360) * 255;
		break;
	}
	switch (opt.outputRange[1]) {
	  case 100:
		s = s * 100;
	  case 1:
		break;
	  default:
		s = s * 255;
		break;
	}
	switch (opt.outputRange[2]) {
	  case 100:
		v = (v / 255) * 100;
		break;
	  case 1:
		v = (v / 255);
		break;
	  default:
		break;
	}
	h = dojo.math.round(h);
	s = dojo.math.round(s);
	v = dojo.math.round(v);
	return [h, s, v];
};
dojo.gfx.color.hsv2rgb = function (h, s, v, options) {
	if (dojo.lang.isArray(h)) {
		if (s) {
			options = s;
		}
		v = h[2] || 0;
		s = h[1] || 0;
		h = h[0] || 0;
	}
	var opt = {inputRange:(options && options.inputRange) ? options.inputRange : [255, 255, 255], outputRange:(options && options.outputRange) ? options.outputRange : 255};
	switch (opt.inputRange[0]) {
	  case 1:
		h = h * 360;
		break;
	  case 100:
		h = (h / 100) * 360;
		break;
	  case 360:
		h = h;
		break;
	  default:
		h = (h / 255) * 360;
	}
	if (h == 360) {
		h = 0;
	}
	switch (opt.inputRange[1]) {
	  case 100:
		s /= 100;
		break;
	  case 255:
		s /= 255;
	}
	switch (opt.inputRange[2]) {
	  case 100:
		v /= 100;
		break;
	  case 255:
		v /= 255;
	}
	var r = null;
	var g = null;
	var b = null;
	if (s == 0) {
		r = v;
		g = v;
		b = v;
	} else {
		var hTemp = h / 60;
		var i = Math.floor(hTemp);
		var f = hTemp - i;
		var p = v * (1 - s);
		var q = v * (1 - (s * f));
		var t = v * (1 - (s * (1 - f)));
		switch (i) {
		  case 0:
			r = v;
			g = t;
			b = p;
			break;
		  case 1:
			r = q;
			g = v;
			b = p;
			break;
		  case 2:
			r = p;
			g = v;
			b = t;
			break;
		  case 3:
			r = p;
			g = q;
			b = v;
			break;
		  case 4:
			r = t;
			g = p;
			b = v;
			break;
		  case 5:
			r = v;
			g = p;
			b = q;
			break;
		}
	}
	switch (opt.outputRange) {
	  case 1:
		r = dojo.math.round(r, 2);
		g = dojo.math.round(g, 2);
		b = dojo.math.round(b, 2);
		break;
	  case 100:
		r = Math.round(r * 100);
		g = Math.round(g * 100);
		b = Math.round(b * 100);
		break;
	  default:
		r = Math.round(r * 255);
		g = Math.round(g * 255);
		b = Math.round(b * 255);
	}
	return [r, g, b];
};