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/* |
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Flot plugin that adds some extra symbols for plotting points. |
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|
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The symbols are accessed as strings through the standard symbol |
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choice: |
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|
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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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*/ |
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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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|
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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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|
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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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|
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function init(plot) { |
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plot.hooks.processDatapoints.push(processRawData); |
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} |
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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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