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-/**
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- * Farbtastic Color Picker 1.2
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- * © 2008 Steven Wittens
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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- */
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-
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-jQuery.fn.farbtastic = function (callback) {
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- $.farbtastic(this, callback);
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- return this;
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-};
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-
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-jQuery.farbtastic = function (container, callback) {
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- var container = $(container).get(0);
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- return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
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-}
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-
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-jQuery._farbtastic = function (container, callback) {
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- // Store farbtastic object
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- var fb = this;
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-
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- // Insert markup
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- $(container).html('<div class="farbtastic"><div class="color"></div><div class="wheel"></div><div class="overlay"></div><div class="h-marker marker"></div><div class="sl-marker marker"></div></div>');
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- var e = $('.farbtastic', container);
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- fb.wheel = $('.wheel', container).get(0);
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- // Dimensions
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- fb.radius = 84;
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- fb.square = 100;
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- fb.width = 194;
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-
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- // Fix background PNGs in IE6
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- if (navigator.appVersion.match(/MSIE [0-6]\./)) {
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- $('*', e).each(function () {
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- if (this.currentStyle.backgroundImage != 'none') {
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- var image = this.currentStyle.backgroundImage;
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- image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
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- $(this).css({
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- 'backgroundImage': 'none',
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- 'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
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- });
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- }
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- });
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- }
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-
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- /**
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- * Link to the given element(s) or callback.
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- */
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- fb.linkTo = function (callback) {
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- // Unbind previous nodes
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- if (typeof fb.callback == 'object') {
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- $(fb.callback).unbind('keyup', fb.updateValue);
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- }
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-
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- // Reset color
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- fb.color = null;
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-
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- // Bind callback or elements
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- if (typeof callback == 'function') {
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- fb.callback = callback;
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- }
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- else if (typeof callback == 'object' || typeof callback == 'string') {
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- fb.callback = $(callback);
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- fb.callback.bind('keyup', fb.updateValue);
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- if (fb.callback.get(0).value) {
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- fb.setColor(fb.callback.get(0).value);
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- }
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- }
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- return this;
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- }
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- fb.updateValue = function (event) {
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- if (this.value && this.value != fb.color) {
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- fb.setColor(this.value);
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- }
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- }
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-
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- /**
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- * Change color with HTML syntax #123456
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- */
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- fb.setColor = function (color) {
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- var unpack = fb.unpack(color);
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- if (fb.color != color && unpack) {
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- fb.color = color;
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- fb.rgb = unpack;
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- fb.hsl = fb.RGBToHSL(fb.rgb);
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- fb.updateDisplay();
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- }
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- return this;
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- }
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-
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- /**
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- * Change color with HSL triplet [0..1, 0..1, 0..1]
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- */
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- fb.setHSL = function (hsl) {
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- fb.hsl = hsl;
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- fb.rgb = fb.HSLToRGB(hsl);
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- fb.color = fb.pack(fb.rgb);
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- fb.updateDisplay();
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- return this;
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- }
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-
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- /////////////////////////////////////////////////////
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-
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- /**
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- * Retrieve the coordinates of the given event relative to the center
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- * of the widget.
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- */
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- fb.widgetCoords = function (event) {
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- var x, y;
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- var el = event.target || event.srcElement;
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- var reference = fb.wheel;
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-
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- if (typeof event.offsetX != 'undefined') {
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- // Use offset coordinates and find common offsetParent
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- var pos = { x: event.offsetX, y: event.offsetY };
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-
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- // Send the coordinates upwards through the offsetParent chain.
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- var e = el;
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- while (e) {
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- e.mouseX = pos.x;
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- e.mouseY = pos.y;
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- pos.x += e.offsetLeft;
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- pos.y += e.offsetTop;
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- e = e.offsetParent;
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- }
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-
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- // Look for the coordinates starting from the wheel widget.
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- var e = reference;
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- var offset = { x: 0, y: 0 }
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- while (e) {
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- if (typeof e.mouseX != 'undefined') {
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- x = e.mouseX - offset.x;
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- y = e.mouseY - offset.y;
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- break;
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- }
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- offset.x += e.offsetLeft;
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- offset.y += e.offsetTop;
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- e = e.offsetParent;
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- }
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-
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- // Reset stored coordinates
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- e = el;
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- while (e) {
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- e.mouseX = undefined;
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- e.mouseY = undefined;
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- e = e.offsetParent;
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- }
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- }
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- else {
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- // Use absolute coordinates
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- var pos = fb.absolutePosition(reference);
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- x = (event.pageX || 0*(event.clientX + $('html').get(0).scrollLeft)) - pos.x;
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- y = (event.pageY || 0*(event.clientY + $('html').get(0).scrollTop)) - pos.y;
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- }
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- // Subtract distance to middle
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- return { x: x - fb.width / 2, y: y - fb.width / 2 };
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- }
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-
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- /**
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- * Mousedown handler
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- */
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- fb.mousedown = function (event) {
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- // Capture mouse
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- if (!document.dragging) {
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- $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
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- document.dragging = true;
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- }
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-
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- // Check which area is being dragged
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- var pos = fb.widgetCoords(event);
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- fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
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-
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- // Process
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- fb.mousemove(event);
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- return false;
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- }
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-
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- /**
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- * Mousemove handler
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- */
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- fb.mousemove = function (event) {
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- // Get coordinates relative to color picker center
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- var pos = fb.widgetCoords(event);
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-
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- // Set new HSL parameters
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- if (fb.circleDrag) {
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- var hue = Math.atan2(pos.x, -pos.y) / 6.28;
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- if (hue < 0) hue += 1;
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- fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
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- }
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- else {
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- var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
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- var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
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- fb.setHSL([fb.hsl[0], sat, lum]);
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- }
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- return false;
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- }
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-
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- /**
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- * Mouseup handler
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- */
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- fb.mouseup = function () {
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- // Uncapture mouse
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- $(document).unbind('mousemove', fb.mousemove);
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- $(document).unbind('mouseup', fb.mouseup);
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- document.dragging = false;
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- }
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-
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- /**
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- * Update the markers and styles
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- */
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- fb.updateDisplay = function () {
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- // Markers
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- var angle = fb.hsl[0] * 6.28;
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- $('.h-marker', e).css({
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- left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
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- top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
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- });
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-
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- $('.sl-marker', e).css({
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- left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
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- top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
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- });
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-
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- // Saturation/Luminance gradient
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- $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
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-
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- // Linked elements or callback
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- if (typeof fb.callback == 'object') {
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- // Set background/foreground color
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- $(fb.callback).css({
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- backgroundColor: fb.color,
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- color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
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- });
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-
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- // Change linked value
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- $(fb.callback).each(function() {
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- if (this.value && this.value != fb.color) {
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- this.value = fb.color;
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- }
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- });
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- }
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- else if (typeof fb.callback == 'function') {
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- fb.callback.call(fb, fb.color);
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- }
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- }
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-
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- /**
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- * Get absolute position of element
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- */
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- fb.absolutePosition = function (el) {
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- var r = { x: el.offsetLeft, y: el.offsetTop };
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- // Resolve relative to offsetParent
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- if (el.offsetParent) {
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- var tmp = fb.absolutePosition(el.offsetParent);
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- r.x += tmp.x;
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- r.y += tmp.y;
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- }
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- return r;
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- };
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-
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- /* Various color utility functions */
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- fb.pack = function (rgb) {
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- var r = Math.round(rgb[0] * 255);
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- var g = Math.round(rgb[1] * 255);
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- var b = Math.round(rgb[2] * 255);
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- return '#' + (r < 16 ? '0' : '') + r.toString(16) +
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- (g < 16 ? '0' : '') + g.toString(16) +
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- (b < 16 ? '0' : '') + b.toString(16);
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- }
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-
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- fb.unpack = function (color) {
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- if (color.length == 7) {
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- return [parseInt('0x' + color.substring(1, 3)) / 255,
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- parseInt('0x' + color.substring(3, 5)) / 255,
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- parseInt('0x' + color.substring(5, 7)) / 255];
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- }
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- else if (color.length == 4) {
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- return [parseInt('0x' + color.substring(1, 2)) / 15,
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- parseInt('0x' + color.substring(2, 3)) / 15,
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- parseInt('0x' + color.substring(3, 4)) / 15];
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- }
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- }
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-
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- fb.HSLToRGB = function (hsl) {
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- var m1, m2, r, g, b;
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- var h = hsl[0], s = hsl[1], l = hsl[2];
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- m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
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- m1 = l * 2 - m2;
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- return [this.hueToRGB(m1, m2, h+0.33333),
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- this.hueToRGB(m1, m2, h),
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- this.hueToRGB(m1, m2, h-0.33333)];
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- }
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-
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- fb.hueToRGB = function (m1, m2, h) {
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- h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
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- if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
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- if (h * 2 < 1) return m2;
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- if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
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- return m1;
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- }
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-
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- fb.RGBToHSL = function (rgb) {
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- var min, max, delta, h, s, l;
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- var r = rgb[0], g = rgb[1], b = rgb[2];
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- min = Math.min(r, Math.min(g, b));
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- max = Math.max(r, Math.max(g, b));
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- delta = max - min;
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- l = (min + max) / 2;
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- s = 0;
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- if (l > 0 && l < 1) {
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- s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
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- }
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- h = 0;
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- if (delta > 0) {
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- if (max == r && max != g) h += (g - b) / delta;
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- if (max == g && max != b) h += (2 + (b - r) / delta);
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- if (max == b && max != r) h += (4 + (r - g) / delta);
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- h /= 6;
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- }
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- return [h, s, l];
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- }
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-
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- // Install mousedown handler (the others are set on the document on-demand)
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- $('*', e).mousedown(fb.mousedown);
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-
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- // Init color
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- fb.setColor('#000000');
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-
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- // Set linked elements/callback
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- if (callback) {
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- fb.linkTo(callback);
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- }
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-}
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