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jquery.flot.symbol.js
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/* Flot plugin that adds some extra symbols for plotting points. Copyright (c) 2007-2014 IOLA and Ole Laursen. Licensed under the MIT license. The symbols are accessed as strings through the standard symbol options: series: { points: { symbol: "square" // or "diamond", "triangle", "cross" } } */ (function ($) { function processRawData(plot, series, datapoints) { // we normalize the area of each symbol so it is approximately the // same as a circle of the given radius var handlers = { square: function (ctx, x, y, radius, shadow) { // pi * r^2 = (2s)^2 => s = r * sqrt(pi)/2 var size = radius * Math.sqrt(Math.PI) / 2; ctx.rect(x - size, y - size, size + size, size + size); }, diamond: function (ctx, x, y, radius, shadow) { // pi * r^2 = 2s^2 => s = r * sqrt(pi/2) var size = radius * Math.sqrt(Math.PI / 2); ctx.moveTo(x - size, y); ctx.lineTo(x, y - size); ctx.lineTo(x + size, y); ctx.lineTo(x, y + size); ctx.lineTo(x - size, y); }, triangle: function (ctx, x, y, radius, shadow) { // pi * r^2 = 1/2 * s^2 * sin (pi / 3) => s = r * sqrt(2 * pi / sin(pi / 3)) var size = radius * Math.sqrt(2 * Math.PI / Math.sin(Math.PI / 3)); var height = size * Math.sin(Math.PI / 3); ctx.moveTo(x - size/2, y + height/2); ctx.lineTo(x + size/2, y + height/2); if (!shadow) { ctx.lineTo(x, y - height/2); ctx.lineTo(x - size/2, y + height/2); } }, cross: function (ctx, x, y, radius, shadow) { // pi * r^2 = (2s)^2 => s = r * sqrt(pi)/2 var size = radius * Math.sqrt(Math.PI) / 2; ctx.moveTo(x - size, y - size); ctx.lineTo(x + size, y + size); ctx.moveTo(x - size, y + size); ctx.lineTo(x + size, y - size); } }; var s = series.points.symbol; if (handlers[s]) series.points.symbol = handlers[s]; } function init(plot) { plot.hooks.processDatapoints.push(processRawData); } $.plot.plugins.push({ init: init, name: 'symbols', version: '1.0' }); })(jQuery);