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(function($){
$.okgradient = function(el, options){
var base = this;
base.$el = $(el);
base.el = el;
base.$el.data("okgradient", base);
var width = $(window).width();
var height = $(window).height();
var browsers = " -webkit- -moz- -o- -ms-".split(" ");
base.init = function(){
base.options = $.extend({}, $.okgradient.options, options);
base.build();
};
base.build = function(){
base.start();
if (base.options.type in base.actions) {
base.action = base.actions[ base.options.type ];
}
};
base.start = function () {
$(window).bind({
mousemove: base.mousemove
});
base.mousemove({ pageX: $(window).width() / 2, pageY: $(window).height() / 2 });
if (base.options.transparent) {
base.el.style.color = "transparent";
}
};
base.parsecolor = function (rgb) {
var x = rgb.replace('rgb(','').replace(')','').split(',');
return [parseInt(x[0]), parseInt(x[1]), parseInt(x[2])];
};
base.scale = function (x, xbasis, newbasis) {
return (x - xbasis[0]) / (xbasis[1] - xbasis[0]) * (newbasis[1] - newbasis[0]) + newbasis[0];
};
base.clamp = function (x, min, max) {
return Math.max(min, Math.min(max, x));
};
base.parse_range = function (x, range) {
if (typeof range === "number") return range;
return base.scale(x, [0,1], range);
};
base.average_rgb = function (a, b, distance) {
var x = [];
for (var i = 0; i < 3; i++)
x[i] = Math.floor( a[i] * distance + b[i] * (1-distance) )
return x;
};
base.setoption = function (key, value) {
if (typeof key === "string") {
base.options[key] = value;
} else {
base.options = $.extend(base.options, key);
}
base.mousemove(base);
};
base.mousemove = function (e){
var offset = base.$el.offset(),
x = e.pageX,
y = e.pageY;
cy = offset.top + base.$el.height() / 2,
cx = offset.left + base.$el.width() / 2,
dx = (cx - x),
dy = (cy - y),
distance = Math.sqrt(dx*dx + dy*dy),
ratio = 1 - distance / $(window).height();
base.pageX = x;
base.pageY = y;
base.action(ratio);
};
base.opacity = function (ratio) {
base.el.style.opacity = ratio;
};
base.hsl = function (ratio, ranges) {
var hue = base.parse_range(ratio, ranges.hue),
sat = base.parse_range(ratio, ranges.saturation),
lum = base.parse_range(ratio, ranges.luminance);
if ("alpha" in ranges) {
var alpha = base.parse_range(ratio, ranges.alpha);
return "hsla(" + hue + "," + sat + "%," + lum + "%," + alpha + ")";
} else {
return "hsl(" + hue + "," + sat + "%," + lum + "%)";
}
};
base.background = function (ratio) {
var color = base.hsl(ratio, base.options);
base.el.style.background = color;
};
base.backgroundRadialGradient = function (ratio) {
var start = base.hsl(ratio, base.options.start),
end = base.hsl(ratio, base.options.end);
var gradient = 'radial-gradient(bottom, ' + start + ' 0%, ' + end + ' 100%);';
var gradients = "";
for (var i = 0, len = browsers.length; i < len; i++)
gradients += "background: " + browsers[i] + gradient + ";";
base.el.style.cssText = gradients;
};
base.backgroundLinearGradient = function (ratio) {
var start = base.hsl(ratio, base.options.start),
end = base.hsl(ratio, base.options.end);
var gradient = 'linear-gradient(bottom, ' + start + ' 0%, ' + end + ' 100%);';
var gradients = "";
for (var i = 0, len = browsers.length; i < len; i++)
gradients += "background: " + browsers[i] + gradient + ";";
base.el.style.cssText = gradients;
};
// initialize action to no-op
base.action = function(){};
base.actions = {
"opacity": base.opacity,
"background": base.background,
"background linear-gradient": base.backgroundLinearGradient,
"background radial-gradient": base.backgroundRadialGradient,
};
base.init();
};
$.okgradient.options = {
hue: [0,360],
saturation: [50,50],
luminance: [50,50],
opacity: [1,1],
};
$.fn.okgradient = function(options){
return this.each(function(){
(new $.okgradient(this, options));
});
};
})(jQuery);
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