| /* | |
| Flot plugin that adds some extra symbols for plotting points. | |
| The symbols are accessed as strings through the standard symbol | |
| choice: | |
| 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); | |