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