1 /* Flot plugin that adds some extra symbols for plotting points. 2 3 Copyright (c) 2007-2014 IOLA and Ole Laursen. 4 Licensed under the MIT license. 5 6 The symbols are accessed as strings through the standard symbol options: 7 8 series: { 9 points: { 10 symbol: "square" // or "diamond", "triangle", "cross" 11 } 12 } 13 14 */ 15 16 (function ($) { 17 function processRawData(plot, series, datapoints) { 18 // we normalize the area of each symbol so it is approximately the 19 // same as a circle of the given radius 20 21 var handlers = { 22 square: function (ctx, x, y, radius, shadow) { 23 // pi * r^2 = (2s)^2 => s = r * sqrt(pi)/2 24 var size = radius * Math.sqrt(Math.PI) / 2; 25 ctx.rect(x - size, y - size, size + size, size + size); 26 }, 27 diamond: function (ctx, x, y, radius, shadow) { 28 // pi * r^2 = 2s^2 => s = r * sqrt(pi/2) 29 var size = radius * Math.sqrt(Math.PI / 2); 30 ctx.moveTo(x - size, y); 31 ctx.lineTo(x, y - size); 32 ctx.lineTo(x + size, y); 33 ctx.lineTo(x, y + size); 34 ctx.lineTo(x - size, y); 35 }, 36 triangle: function (ctx, x, y, radius, shadow) { 37 // pi * r^2 = 1/2 * s^2 * sin (pi / 3) => s = r * sqrt(2 * pi / sin(pi / 3)) 38 var size = radius * Math.sqrt(2 * Math.PI / Math.sin(Math.PI / 3)); 39 var height = size * Math.sin(Math.PI / 3); 40 ctx.moveTo(x - size/2, y + height/2); 41 ctx.lineTo(x + size/2, y + height/2); 42 if (!shadow) { 43 ctx.lineTo(x, y - height/2); 44 ctx.lineTo(x - size/2, y + height/2); 45 } 46 }, 47 cross: function (ctx, x, y, radius, shadow) { 48 // pi * r^2 = (2s)^2 => s = r * sqrt(pi)/2 49 var size = radius * Math.sqrt(Math.PI) / 2; 50 ctx.moveTo(x - size, y - size); 51 ctx.lineTo(x + size, y + size); 52 ctx.moveTo(x - size, y + size); 53 ctx.lineTo(x + size, y - size); 54 } 55 }; 56 57 var s = series.points.symbol; 58 if (handlers[s]) 59 series.points.symbol = handlers[s]; 60 } 61 62 function init(plot) { 63 plot.hooks.processDatapoints.push(processRawData); 64 } 65 66 $.plot.plugins.push({ 67 init: init, 68 name: 'symbols', 69 version: '1.0' 70 }); 71 })(jQuery); 72
