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