Blame view
static/plugins/flot/jquery.flot.errorbars.js
12.3 KB
831eac332
add file
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 |
/* Flot plugin for plotting error bars.
Copyright (c) 2007-2013 IOLA and Ole Laursen.
Licensed under the MIT license.
Error bars are used to show standard deviation and other statistical
properties in a plot.
* Created by Rui Pereira - rui (dot) pereira (at) gmail (dot) com
This plugin allows you to plot error-bars over points. Set "errorbars" inside
the points series to the axis name over which there will be error values in
your data array (*even* if you do not intend to plot them later, by setting
"show: null" on xerr/yerr).
The plugin supports these options:
series: {
points: {
errorbars: "x" or "y" or "xy",
xerr: {
show: null/false or true,
asymmetric: null/false or true,
upperCap: null or "-" or function,
lowerCap: null or "-" or function,
color: null or color,
radius: null or number
},
yerr: { same options as xerr }
}
}
Each data point array is expected to be of the type:
"x" [ x, y, xerr ]
"y" [ x, y, yerr ]
"xy" [ x, y, xerr, yerr ]
Where xerr becomes xerr_lower,xerr_upper for the asymmetric error case, and
equivalently for yerr. Eg., a datapoint for the "xy" case with symmetric
error-bars on X and asymmetric on Y would be:
[ x, y, xerr, yerr_lower, yerr_upper ]
By default no end caps are drawn. Setting upperCap and/or lowerCap to "-" will
draw a small cap perpendicular to the error bar. They can also be set to a
user-defined drawing function, with (ctx, x, y, radius) as parameters, as eg.
function drawSemiCircle( ctx, x, y, radius ) {
ctx.beginPath();
ctx.arc( x, y, radius, 0, Math.PI, false );
ctx.moveTo( x - radius, y );
ctx.lineTo( x + radius, y );
ctx.stroke();
}
Color and radius both default to the same ones of the points series if not
set. The independent radius parameter on xerr/yerr is useful for the case when
we may want to add error-bars to a line, without showing the interconnecting
points (with radius: 0), and still showing end caps on the error-bars.
shadowSize and lineWidth are derived as well from the points series.
*/
(function ($) {
var options = {
series: {
points: {
errorbars: null, //should be 'x', 'y' or 'xy'
xerr: { err: 'x', show: null, asymmetric: null, upperCap: null, lowerCap: null, color: null, radius: null},
yerr: { err: 'y', show: null, asymmetric: null, upperCap: null, lowerCap: null, color: null, radius: null}
}
}
};
function processRawData(plot, series, data, datapoints){
if (!series.points.errorbars)
return;
// x,y values
var format = [
{ x: true, number: true, required: true },
{ y: true, number: true, required: true }
];
var errors = series.points.errorbars;
// error bars - first X then Y
if (errors == 'x' || errors == 'xy') {
// lower / upper error
if (series.points.xerr.asymmetric) {
format.push({ x: true, number: true, required: true });
format.push({ x: true, number: true, required: true });
} else
format.push({ x: true, number: true, required: true });
}
if (errors == 'y' || errors == 'xy') {
// lower / upper error
if (series.points.yerr.asymmetric) {
format.push({ y: true, number: true, required: true });
format.push({ y: true, number: true, required: true });
} else
format.push({ y: true, number: true, required: true });
}
datapoints.format = format;
}
function parseErrors(series, i){
var points = series.datapoints.points;
// read errors from points array
var exl = null,
exu = null,
eyl = null,
eyu = null;
var xerr = series.points.xerr,
yerr = series.points.yerr;
var eb = series.points.errorbars;
// error bars - first X
if (eb == 'x' || eb == 'xy') {
if (xerr.asymmetric) {
exl = points[i + 2];
exu = points[i + 3];
if (eb == 'xy')
if (yerr.asymmetric){
eyl = points[i + 4];
eyu = points[i + 5];
} else eyl = points[i + 4];
} else {
exl = points[i + 2];
if (eb == 'xy')
if (yerr.asymmetric) {
eyl = points[i + 3];
eyu = points[i + 4];
} else eyl = points[i + 3];
}
// only Y
} else if (eb == 'y')
if (yerr.asymmetric) {
eyl = points[i + 2];
eyu = points[i + 3];
} else eyl = points[i + 2];
// symmetric errors?
if (exu == null) exu = exl;
if (eyu == null) eyu = eyl;
var errRanges = [exl, exu, eyl, eyu];
// nullify if not showing
if (!xerr.show){
errRanges[0] = null;
errRanges[1] = null;
}
if (!yerr.show){
errRanges[2] = null;
errRanges[3] = null;
}
return errRanges;
}
function drawSeriesErrors(plot, ctx, s){
var points = s.datapoints.points,
ps = s.datapoints.pointsize,
ax = [s.xaxis, s.yaxis],
radius = s.points.radius,
err = [s.points.xerr, s.points.yerr];
//sanity check, in case some inverted axis hack is applied to flot
var invertX = false;
if (ax[0].p2c(ax[0].max) < ax[0].p2c(ax[0].min)) {
invertX = true;
var tmp = err[0].lowerCap;
err[0].lowerCap = err[0].upperCap;
err[0].upperCap = tmp;
}
var invertY = false;
if (ax[1].p2c(ax[1].min) < ax[1].p2c(ax[1].max)) {
invertY = true;
var tmp = err[1].lowerCap;
err[1].lowerCap = err[1].upperCap;
err[1].upperCap = tmp;
}
for (var i = 0; i < s.datapoints.points.length; i += ps) {
//parse
var errRanges = parseErrors(s, i);
//cycle xerr & yerr
for (var e = 0; e < err.length; e++){
var minmax = [ax[e].min, ax[e].max];
//draw this error?
if (errRanges[e * err.length]){
//data coordinates
var x = points[i],
y = points[i + 1];
//errorbar ranges
var upper = [x, y][e] + errRanges[e * err.length + 1],
lower = [x, y][e] - errRanges[e * err.length];
//points outside of the canvas
if (err[e].err == 'x')
if (y > ax[1].max || y < ax[1].min || upper < ax[0].min || lower > ax[0].max)
continue;
if (err[e].err == 'y')
if (x > ax[0].max || x < ax[0].min || upper < ax[1].min || lower > ax[1].max)
continue;
// prevent errorbars getting out of the canvas
var drawUpper = true,
drawLower = true;
if (upper > minmax[1]) {
drawUpper = false;
upper = minmax[1];
}
if (lower < minmax[0]) {
drawLower = false;
lower = minmax[0];
}
//sanity check, in case some inverted axis hack is applied to flot
if ((err[e].err == 'x' && invertX) || (err[e].err == 'y' && invertY)) {
//swap coordinates
var tmp = lower;
lower = upper;
upper = tmp;
tmp = drawLower;
drawLower = drawUpper;
drawUpper = tmp;
tmp = minmax[0];
minmax[0] = minmax[1];
minmax[1] = tmp;
}
// convert to pixels
x = ax[0].p2c(x),
y = ax[1].p2c(y),
upper = ax[e].p2c(upper);
lower = ax[e].p2c(lower);
minmax[0] = ax[e].p2c(minmax[0]);
minmax[1] = ax[e].p2c(minmax[1]);
//same style as points by default
var lw = err[e].lineWidth ? err[e].lineWidth : s.points.lineWidth,
sw = s.points.shadowSize != null ? s.points.shadowSize : s.shadowSize;
//shadow as for points
if (lw > 0 && sw > 0) {
var w = sw / 2;
ctx.lineWidth = w;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
drawError(ctx, err[e], x, y, upper, lower, drawUpper, drawLower, radius, w + w/2, minmax);
ctx.strokeStyle = "rgba(0,0,0,0.2)";
drawError(ctx, err[e], x, y, upper, lower, drawUpper, drawLower, radius, w/2, minmax);
}
ctx.strokeStyle = err[e].color? err[e].color: s.color;
ctx.lineWidth = lw;
//draw it
drawError(ctx, err[e], x, y, upper, lower, drawUpper, drawLower, radius, 0, minmax);
}
}
}
}
function drawError(ctx,err,x,y,upper,lower,drawUpper,drawLower,radius,offset,minmax){
//shadow offset
y += offset;
upper += offset;
lower += offset;
// error bar - avoid plotting over circles
if (err.err == 'x'){
if (upper > x + radius) drawPath(ctx, [[upper,y],[Math.max(x + radius,minmax[0]),y]]);
else drawUpper = false;
if (lower < x - radius) drawPath(ctx, [[Math.min(x - radius,minmax[1]),y],[lower,y]] );
else drawLower = false;
}
else {
if (upper < y - radius) drawPath(ctx, [[x,upper],[x,Math.min(y - radius,minmax[0])]] );
else drawUpper = false;
if (lower > y + radius) drawPath(ctx, [[x,Math.max(y + radius,minmax[1])],[x,lower]] );
else drawLower = false;
}
//internal radius value in errorbar, allows to plot radius 0 points and still keep proper sized caps
//this is a way to get errorbars on lines without visible connecting dots
radius = err.radius != null? err.radius: radius;
// upper cap
if (drawUpper) {
if (err.upperCap == '-'){
if (err.err=='x') drawPath(ctx, [[upper,y - radius],[upper,y + radius]] );
else drawPath(ctx, [[x - radius,upper],[x + radius,upper]] );
} else if ($.isFunction(err.upperCap)){
if (err.err=='x') err.upperCap(ctx, upper, y, radius);
else err.upperCap(ctx, x, upper, radius);
}
}
// lower cap
if (drawLower) {
if (err.lowerCap == '-'){
if (err.err=='x') drawPath(ctx, [[lower,y - radius],[lower,y + radius]] );
else drawPath(ctx, [[x - radius,lower],[x + radius,lower]] );
} else if ($.isFunction(err.lowerCap)){
if (err.err=='x') err.lowerCap(ctx, lower, y, radius);
else err.lowerCap(ctx, x, lower, radius);
}
}
}
function drawPath(ctx, pts){
ctx.beginPath();
ctx.moveTo(pts[0][0], pts[0][1]);
for (var p=1; p < pts.length; p++)
ctx.lineTo(pts[p][0], pts[p][1]);
ctx.stroke();
}
function draw(plot, ctx){
var plotOffset = plot.getPlotOffset();
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
$.each(plot.getData(), function (i, s) {
if (s.points.errorbars && (s.points.xerr.show || s.points.yerr.show))
drawSeriesErrors(plot, ctx, s);
});
ctx.restore();
}
function init(plot) {
plot.hooks.processRawData.push(processRawData);
plot.hooks.draw.push(draw);
}
$.plot.plugins.push({
init: init,
options: options,
name: 'errorbars',
version: '1.0'
});
})(jQuery);
|