| 3284 |
vikas |
1 |
/*
|
|
|
2 |
Flot plugin that adds some extra symbols for plotting points.
|
|
|
3 |
|
|
|
4 |
The symbols are accessed as strings through the standard symbol
|
|
|
5 |
choice:
|
|
|
6 |
|
|
|
7 |
series: {
|
|
|
8 |
points: {
|
|
|
9 |
symbol: "square" // or "diamond", "triangle", "cross"
|
|
|
10 |
}
|
|
|
11 |
}
|
|
|
12 |
|
|
|
13 |
*/
|
|
|
14 |
|
|
|
15 |
(function ($) {
|
|
|
16 |
function processRawData(plot, series, datapoints) {
|
|
|
17 |
// we normalize the area of each symbol so it is approximately the
|
|
|
18 |
// same as a circle of the given radius
|
|
|
19 |
|
|
|
20 |
var handlers = {
|
|
|
21 |
square: function (ctx, x, y, radius, shadow) {
|
|
|
22 |
// pi * r^2 = (2s)^2 => s = r * sqrt(pi)/2
|
|
|
23 |
var size = radius * Math.sqrt(Math.PI) / 2;
|
|
|
24 |
ctx.rect(x - size, y - size, size + size, size + size);
|
|
|
25 |
},
|
|
|
26 |
diamond: function (ctx, x, y, radius, shadow) {
|
|
|
27 |
// pi * r^2 = 2s^2 => s = r * sqrt(pi/2)
|
|
|
28 |
var size = radius * Math.sqrt(Math.PI / 2);
|
|
|
29 |
ctx.moveTo(x - size, y);
|
|
|
30 |
ctx.lineTo(x, y - size);
|
|
|
31 |
ctx.lineTo(x + size, y);
|
|
|
32 |
ctx.lineTo(x, y + size);
|
|
|
33 |
ctx.lineTo(x - size, y);
|
|
|
34 |
},
|
|
|
35 |
triangle: function (ctx, x, y, radius, shadow) {
|
|
|
36 |
// pi * r^2 = 1/2 * s^2 * sin (pi / 3) => s = r * sqrt(2 * pi / sin(pi / 3))
|
|
|
37 |
var size = radius * Math.sqrt(2 * Math.PI / Math.sin(Math.PI / 3));
|
|
|
38 |
var height = size * Math.sin(Math.PI / 3);
|
|
|
39 |
ctx.moveTo(x - size/2, y + height/2);
|
|
|
40 |
ctx.lineTo(x + size/2, y + height/2);
|
|
|
41 |
if (!shadow) {
|
|
|
42 |
ctx.lineTo(x, y - height/2);
|
|
|
43 |
ctx.lineTo(x - size/2, y + height/2);
|
|
|
44 |
}
|
|
|
45 |
},
|
|
|
46 |
cross: function (ctx, x, y, radius, shadow) {
|
|
|
47 |
// pi * r^2 = (2s)^2 => s = r * sqrt(pi)/2
|
|
|
48 |
var size = radius * Math.sqrt(Math.PI) / 2;
|
|
|
49 |
ctx.moveTo(x - size, y - size);
|
|
|
50 |
ctx.lineTo(x + size, y + size);
|
|
|
51 |
ctx.moveTo(x - size, y + size);
|
|
|
52 |
ctx.lineTo(x + size, y - size);
|
|
|
53 |
}
|
|
|
54 |
}
|
|
|
55 |
|
|
|
56 |
var s = series.points.symbol;
|
|
|
57 |
if (handlers[s])
|
|
|
58 |
series.points.symbol = handlers[s];
|
|
|
59 |
}
|
|
|
60 |
|
|
|
61 |
function init(plot) {
|
|
|
62 |
plot.hooks.processDatapoints.push(processRawData);
|
|
|
63 |
}
|
|
|
64 |
|
|
|
65 |
$.plot.plugins.push({
|
|
|
66 |
init: init,
|
|
|
67 |
name: 'symbols',
|
|
|
68 |
version: '1.0'
|
|
|
69 |
});
|
|
|
70 |
})(jQuery);
|