| 提交 | 用户 | 时间 | ||
| 58d006 | 1 | /* Flot plugin that adds some extra symbols for plotting points. |
| A | 2 | |
| 3 | Copyright (c) 2007-2013 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); | |
