525 lines
16 KiB
JavaScript
525 lines
16 KiB
JavaScript
// Farbtastic 2.0 alpha
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(function ($) {
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var __debug = false;
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var __factor = 0.5;
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$.fn.farbtastic = function (options) {
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$.farbtastic(this, options);
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return this;
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};
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$.farbtastic = function (container, options) {
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var container = $(container)[0];
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return container.farbtastic || (container.farbtastic = new $._farbtastic(container, options));
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}
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$._farbtastic = function (container, options) {
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var fb = this;
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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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// Reset color
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fb.color = null;
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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[0].value) {
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fb.setColor(fb.callback[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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* 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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* 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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var convertedHSL = [hsl[0]]
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convertedHSL[1] = hsl[1]*__factor+((1-__factor)/2);
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convertedHSL[2] = hsl[2]*__factor+((1-__factor)/2);
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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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//excanvas-compatible building of canvases
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fb._makeCanvas = function(className){
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var c = document.createElement('canvas');
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if (!c.getContext) { // excanvas hack
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c = window.G_vmlCanvasManager.initElement(c);
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c.getContext(); //this creates the excanvas children
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}
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$(c).addClass(className);
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return c;
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}
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/**
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* Initialize the color picker widget.
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*/
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fb.initWidget = function () {
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// Insert markup and size accordingly.
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var dim = {
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width: options.width,
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height: options.width
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};
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$(container)
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.html(
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'<div class="farbtastic" style="position: relative">' +
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'<div class="farbtastic-solid"></div>' +
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'</div>'
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)
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.children('.farbtastic')
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.append(fb._makeCanvas('farbtastic-mask'))
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.append(fb._makeCanvas('farbtastic-overlay'))
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.end()
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.find('*').attr(dim).css(dim).end()
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.find('div>*').css('position', 'absolute');
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// Determine layout
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fb.radius = (options.width - options.wheelWidth) / 2 - 1;
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fb.square = Math.floor((fb.radius - options.wheelWidth / 2) * 0.7) - 1;
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fb.mid = Math.floor(options.width / 2);
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fb.markerSize = options.wheelWidth * 0.3;
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fb.solidFill = $('.farbtastic-solid', container).css({
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width: fb.square * 2 - 1,
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height: fb.square * 2 - 1,
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left: fb.mid - fb.square,
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top: fb.mid - fb.square
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});
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// Set up drawing context.
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fb.cnvMask = $('.farbtastic-mask', container);
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fb.ctxMask = fb.cnvMask[0].getContext('2d');
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fb.cnvOverlay = $('.farbtastic-overlay', container);
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fb.ctxOverlay = fb.cnvOverlay[0].getContext('2d');
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fb.ctxMask.translate(fb.mid, fb.mid);
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fb.ctxOverlay.translate(fb.mid, fb.mid);
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// Draw widget base layers.
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fb.drawCircle();
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fb.drawMask();
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}
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/**
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* Draw the color wheel.
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*/
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fb.drawCircle = function () {
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var tm = +(new Date());
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// Draw a hue circle with a bunch of gradient-stroked beziers.
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// Have to use beziers, as gradient-stroked arcs don't work.
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var n = 24,
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r = fb.radius,
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w = options.wheelWidth,
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nudge = 8 / r / n * Math.PI, // Fudge factor for seams.
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m = fb.ctxMask,
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angle1 = 0, color1, d1;
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m.save();
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m.lineWidth = w / r;
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m.scale(r, r);
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// Each segment goes from angle1 to angle2.
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for (var i = 0; i <= n; ++i) {
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var d2 = i / n,
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angle2 = d2 * Math.PI * 2,
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// Endpoints
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x1 = Math.sin(angle1), y1 = -Math.cos(angle1);
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x2 = Math.sin(angle2), y2 = -Math.cos(angle2),
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// Midpoint chosen so that the endpoints are tangent to the circle.
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am = (angle1 + angle2) / 2,
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tan = 1 / Math.cos((angle2 - angle1) / 2),
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xm = Math.sin(am) * tan, ym = -Math.cos(am) * tan,
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// New color
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color2 = fb.pack(fb.HSLToRGB([d2, 1, 0.5]));
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if (i > 0) {
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if ($.browser.msie) {
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// IE's gradient calculations mess up the colors. Correct along the diagonals.
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var corr = (1 + Math.min(Math.abs(Math.tan(angle1)), Math.abs(Math.tan(Math.PI / 2 - angle1)))) / n;
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color1 = fb.pack(fb.HSLToRGB([d1 - 0.15 * corr, 1, 0.5]));
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color2 = fb.pack(fb.HSLToRGB([d2 + 0.15 * corr, 1, 0.5]));
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// Create gradient fill between the endpoints.
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var grad = m.createLinearGradient(x1, y1, x2, y2);
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grad.addColorStop(0, color1);
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grad.addColorStop(1, color2);
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m.fillStyle = grad;
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// Draw quadratic curve segment as a fill.
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var r1 = (r + w / 2) / r, r2 = (r - w / 2) / r; // inner/outer radius.
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m.beginPath();
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m.moveTo(x1 * r1, y1 * r1);
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m.quadraticCurveTo(xm * r1, ym * r1, x2 * r1, y2 * r1);
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m.lineTo(x2 * r2, y2 * r2);
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m.quadraticCurveTo(xm * r2, ym * r2, x1 * r2, y1 * r2);
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m.fill();
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}
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else {
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// Create gradient fill between the endpoints.
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var grad = m.createLinearGradient(x1, y1, x2, y2);
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grad.addColorStop(0, color1);
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grad.addColorStop(1, color2);
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m.strokeStyle = grad;
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// Draw quadratic curve segment.
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m.beginPath();
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m.moveTo(x1, y1);
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m.quadraticCurveTo(xm, ym, x2, y2);
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m.stroke();
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}
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}
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// Prevent seams where curves join.
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angle1 = angle2 - nudge; color1 = color2; d1 = d2;
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}
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m.restore();
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__debug && $('body').append('<div>drawCircle '+ (+(new Date()) - tm) +'ms');
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};
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/**
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* Draw the saturation/luminance mask.
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*/
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fb.drawMask = function () {
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var tm = +(new Date());
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// Iterate over sat/lum space and calculate appropriate mask pixel values.
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var size = fb.square * 2, sq = fb.square;
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function calculateMask(sizex, sizey, outputPixel) {
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var isx = 1 / sizex, isy = 1 / sizey;
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for (var y = 0; y <= sizey; ++y) {
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var l = 1 - y * isy;
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for (var x = 0; x <= sizex; ++x) {
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var s = 1 - x * isx;
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// From sat/lum to alpha and color (grayscale)
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var a = 1 - 2 * Math.min(l * s, (1 - l) * s);
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var c = (a > 0) ? ((2 * l - 1 + a) * .5 / a) : 0;
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a = a*__factor+(1-__factor)/2;
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c = c*__factor+(1-__factor)/2;
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outputPixel(x, y, c, a);
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}
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}
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}
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// Method #1: direct pixel access (new Canvas).
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if (fb.ctxMask.getImageData) {
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// Create half-resolution buffer.
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var sz = Math.floor(size / 2);
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var buffer = document.createElement('canvas');
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buffer.width = buffer.height = sz + 1;
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var ctx = buffer.getContext('2d');
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var frame = ctx.getImageData(0, 0, sz + 1, sz + 1);
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var i = 0;
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calculateMask(sz, sz, function (x, y, c, a) {
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frame.data[i++] = frame.data[i++] = frame.data[i++] = c * 255;
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frame.data[i++] = a * 255;
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});
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ctx.putImageData(frame, 0, 0);
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fb.ctxMask.drawImage(buffer, 0, 0, sz + 1, sz + 1, -sq, -sq, sq * 2, sq * 2);
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}
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// Method #2: drawing commands (old Canvas).
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else if (!$.browser.msie) {
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// Render directly at half-resolution
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var sz = Math.floor(size / 2);
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calculateMask(sz, sz, function (x, y, c, a) {
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c = Math.round(c * 255);
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fb.ctxMask.fillStyle = 'rgba(' + c + ', ' + c + ', ' + c + ', ' + a +')';
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fb.ctxMask.fillRect(x * 2 - sq - 1, y * 2 - sq - 1, 2, 2);
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});
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}
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// Method #3: vertical DXImageTransform gradient strips (IE).
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else {
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var cache_last, cache, w = 6; // Each strip is 6 pixels wide.
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var sizex = Math.floor(size / w);
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// 6 vertical pieces of gradient per strip.
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calculateMask(sizex, 6, function (x, y, c, a) {
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if (x == 0) {
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cache_last = cache;
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cache = [];
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}
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c = Math.round(c * 255);
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a = Math.round(a * 255);
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// We can only start outputting gradients once we have two rows of pixels.
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if (y > 0) {
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var c_last = cache_last[x][0],
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a_last = cache_last[x][1],
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color1 = fb.packDX(c_last, a_last),
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color2 = fb.packDX(c, a),
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y1 = Math.round(fb.mid + ((y - 1) * .333 - 1) * sq),
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y2 = Math.round(fb.mid + (y * .333 - 1) * sq);
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$('<div>').css({
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position: 'absolute',
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filter: "progid:DXImageTransform.Microsoft.Gradient(StartColorStr="+ color1 +", EndColorStr="+ color2 +", GradientType=0)",
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top: y1,
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height: y2 - y1,
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// Avoid right-edge sticking out.
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left: fb.mid + (x * w - sq - 1),
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width: w - (x == sizex ? Math.round(w / 2) : 0)
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}).appendTo(fb.cnvMask);
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}
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cache.push([c, a]);
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});
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}
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__debug && $('body').append('<div>drawMask '+ (+(new Date()) - tm) +'ms');
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}
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/**
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* Draw the selection markers.
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*/
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fb.drawMarkers = function () {
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// Determine marker dimensions
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var sz = options.width, lw = Math.ceil(fb.markerSize / 4), r = fb.markerSize - lw + 1;
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var angle = fb.hsl[0] * 6.28,
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x1 = Math.sin(angle) * fb.radius,
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y1 = -Math.cos(angle) * fb.radius,
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x2 = 2 * fb.square * (.5 - fb.hsl[1]),
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y2 = 2 * fb.square * (.5 - fb.hsl[2]),
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c1 = fb.invert ? '#fff' : '#000',
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c2 = fb.invert ? '#000' : '#fff';
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var circles = [
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{ x: x1, y: y1, r: r, c: '#000', lw: lw + 1 },
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{ x: x1, y: y1, r: fb.markerSize, c: '#fff', lw: lw },
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{ x: x2, y: y2, r: r, c: c2, lw: lw + 1 },
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{ x: x2, y: y2, r: fb.markerSize, c: c1, lw: lw },
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];
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// Update the overlay canvas.
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fb.ctxOverlay.clearRect(-fb.mid, -fb.mid, sz, sz);
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for (i in circles) {
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var c = circles[i];
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fb.ctxOverlay.lineWidth = c.lw;
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fb.ctxOverlay.strokeStyle = c.c;
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fb.ctxOverlay.beginPath();
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fb.ctxOverlay.arc(c.x, c.y, c.r, 0, Math.PI * 2, true);
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fb.ctxOverlay.stroke();
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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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// Determine whether labels/markers should invert.
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fb.invert = (fb.rgb[0] * 0.3 + fb.rgb[1] * .59 + fb.rgb[2] * .11) <= 0.6;
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// Update the solid background fill.
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fb.solidFill.css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
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// Draw markers
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fb.drawMarkers();
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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.invert ? '#fff' : '#000'
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});
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// Change linked value
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$(fb.callback).each(function() {
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if ((typeof this.value == 'string') && this.value != fb.color) {
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this.value = fb.color;
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}
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});
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}
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else if (typeof fb.callback == 'function') {
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fb.callback.call(fb, fb.color);
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}
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}
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/**
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* Helper for returning coordinates relative to the center.
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*/
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fb.widgetCoords = function (event) {
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return {
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x: event.pageX - fb.offset.left - fb.mid,
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y: event.pageY - fb.offset.top - fb.mid
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};
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}
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/**
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* Mousedown handler
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*/
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fb.mousedown = function (event) {
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// Capture mouse
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if (!$._farbtastic.dragging) {
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$(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
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$._farbtastic.dragging = true;
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}
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// Update the stored offset for the widget.
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fb.offset = $(container).offset();
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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)) > (fb.square + 2);
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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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* 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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// 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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fb.setHSL([(hue + 1) % 1, 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 / 2) + .5));
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var lum = Math.max(0, Math.min(1, -(pos.y / fb.square / 2) + .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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* 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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$(document).unbind('mouseup', fb.mouseup);
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$._farbtastic.dragging = false;
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}
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/* Various color utility functions */
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fb.dec2hex = function (x) {
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return (x < 16 ? '0' : '') + x.toString(16);
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}
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fb.packDX = function (c, a) {
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return '#' + fb.dec2hex(a) + fb.dec2hex(c) + fb.dec2hex(c) + fb.dec2hex(c);
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};
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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 '#' + fb.dec2hex(r) + fb.dec2hex(g) + fb.dec2hex(b);
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};
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fb.unpack = function (color) {
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if (color.length == 7) {
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function x(i) {
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return parseInt(color.substring(i, i + 2), 16) / 255;
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}
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return [ x(1), x(3), x(5) ];
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}
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else if (color.length == 4) {
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function x(i) {
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return parseInt(color.substring(i, i + 1), 16) / 15;
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}
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return [ x(1), x(2), x(3) ];
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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 [
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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 + 1) % 1;
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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;
|
|
return m1;
|
|
};
|
|
|
|
fb.RGBToHSL = function (rgb) {
|
|
var r = rgb[0], g = rgb[1], b = rgb[2],
|
|
min = Math.min(r, g, b),
|
|
max = Math.max(r, g, b),
|
|
delta = max - min,
|
|
h = 0,
|
|
s = 0,
|
|
l = (min + max) / 2;
|
|
if (l > 0 && l < 1) {
|
|
s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
|
|
}
|
|
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];
|
|
};
|
|
|
|
// Parse options.
|
|
if (!options.callback) {
|
|
options = { callback: options };
|
|
}
|
|
options = $.extend({
|
|
width: 300,
|
|
wheelWidth: (options.width || 300) / 10,
|
|
callback: null
|
|
}, options);
|
|
|
|
// Initialize.
|
|
fb.initWidget();
|
|
|
|
// Install mousedown handler (the others are set on the document on-demand)
|
|
$('canvas.farbtastic-overlay', container).mousedown(fb.mousedown);
|
|
|
|
// Set linked elements/callback
|
|
if (options.callback) {
|
|
fb.linkTo(options.callback);
|
|
}
|
|
// Set to gray.
|
|
fb.setColor('#808080');
|
|
}
|
|
|
|
})(jQuery);
|