regl-error2d 
Draw error bars for a set of points with regl.
Remake on gl-error2d:
-
colormay define per-bar colors. - max number of points extended 40 times (from
1e5to4e6) via instanced draw. -
lineWidthandcapSizeare adjusted to actual pixels. - enhanced performance via vertex shader.
Demo.
Usage
let regl = require('regl')({extensions: 'angle_instanced_arrays'})
let createError2d = require('regl-error2d')
let error2d = createError2d(regl)
error2d({
positions: [0,0, .5,0, ...],
errors: [.5,.5,.5,.6, .2,.3,.4,.1, ...],
color: 'rgba(0, 100, 200, .75)'
})
createError2d(regl, options?)
Create new error2d instance from regl and initial options. Note that regl instance should have ANGLE_instanced_arrays extension enabled.
error2d(options|list?)
Draw errors, update options.
| Option | Default | Description |
|---|---|---|
positions, points, data
|
[] |
An array of unrolled xy coordinates of the points as [x,y, x,y, ...] or array of points [[x,y], [x,y], ...]. |
errors, error
|
[] |
Array with error values corresponding to the points [e0l,e0r,e0b,e0t, e1l,e1r,e1b,e1t, ...]
|
capSize, cap
|
5 |
Error bar cap size, in pixels |
lineWidth, thickness
|
1 |
Error bar line width, in pixels |
color, colors
|
'red' |
Color or array with colors. Each color can be a css color string or an array with float 0..1 values. |
opacity |
1 |
Error bars opacity. |
range, dataBox
|
null |
Visible data range. |
viewport, viewBox
|
null |
Output area within the canvas. |
A list of options can be passed for batch rendering:
error2d([options1, options2, ...])
error2d.update(options|list)
Update options, not incurring redraw.
error2d.draw(id?)
Draw errors based on last options. id integer can specify a list item to redraw from batch update.
error2d.destroy()
Dispose error2d and associated resources.
License
(c) 2017 Dima Yv. MIT License
Development supported by plot.ly.