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farbtastic.js
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253 lines (223 loc) · 7.6 KB
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/*!
* Farbtastic: NON jQuery color picker plug-in v1.4, based on v1.3u
*
* Licensed under the GPL license:
* http://www.gnu.org/licenses/gpl.html
*/
farbtasticFunc = function (options) {
farbtastic(this, options);
return this;
};
farbtastic = function (container, callback) {
var container = document.getElementById(container);
var callback = document.getElementById(callback);
return container.farbtastic || (container.farbtastic = new _farbtastic(container, callback));
};
_farbtastic = function (container, callback) {
// Store farbtastic object
var fb = this;
// Insert markup
container.innerHTML = '<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>';
fb.wheel = document.getElementsByClassName('wheel')[0];
// Dimensions
fb.radius = 84;
fb.square = 100;
fb.width = 194;
/**
* Link to the given element(s) or callback.
*/
fb.linkTo = function (callback) {
// Unbind previous nodes
if (typeof fb.callback == 'object') {
console.log("Doesn't do anything?");
fb.callback.removeEventListener('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.addEventListener('keyup',fb.updateValue);
if (fb.callback.value) {
fb.setColor(fb.callback.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) {
return { x: (event.pageX - fb.wheel.offsetParent.offsetLeft) - fb.width / 2, y: (event.pageY - fb.wheel.offsetParent.offsetTop) - fb.width / 2 };
};
/**
* Mousedown handler
*/
fb.mousedown = function (event) {
// Capture mouse
if (!document.dragging) {
document.addEventListener('mousemove', fb.mousemove);
document.addEventListener('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.removeEventListener('mousemove', fb.mousemove);
document.removeEventListener('mouseup', fb.mouseup);
document.dragging = false;
};
/**
* Update the markers and styles
*/
fb.updateDisplay = function () {
// Markers
var angle = fb.hsl[0] * 6.28;
document.getElementsByClassName('h-marker')[0].style.left = Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px';
document.getElementsByClassName('h-marker')[0].style.top = Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px';
document.getElementsByClassName('sl-marker')[0].style.left = Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px';
document.getElementsByClassName('sl-marker')[0].style.top = Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px';
// Saturation/Luminance gradient
document.getElementsByClassName('color')[0].style.backgroundColor = fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5]));
// Linked elements or callback
if (typeof fb.callback == 'object') {
// Set background/foreground color
document.getElementById(fb.callback.id).style.backgroundColor = document.getElementById(fb.callback.id + 'RGB').style.backgroundColor = fb.color;
document.getElementById(fb.callback.id).style.color = document.getElementById(fb.callback.id + 'RGB').style.color = fb.hsl[2] > 0.5 ? '#000' : '#fff';
document.getElementById('colorRGB').value = document.getElementById(fb.callback.id).style.backgroundColor.replace(/\s/g,'');
// Change linked value
if (callback.value && callback.value != fb.color) {
callback.value = fb.color;
}
}
else if (typeof fb.callback == 'function') {
fb.callback.call(fb, fb.color);
}
};
/* 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)
document.getElementsByClassName('farbtastic')[0].onmousedown = fb.mousedown;
// Init color
fb.setColor('#000000');
// Set linked elements/callback
if (callback) {
fb.linkTo(callback);
}
};