71 lines
2.4 KiB
JavaScript
71 lines
2.4 KiB
JavaScript
/* Flot plugin that adds some extra symbols for plotting points.
|
|
|
|
Copyright (c) 2007-2014 IOLA and Ole Laursen.
|
|
Licensed under the MIT license.
|
|
|
|
The symbols are accessed as strings through the standard symbol options:
|
|
|
|
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);
|