regl-error2d

    2.0.12 • Public • Published

    regl-error2d experimental

    Draw error bars for a set of points with regl.

    regl-error2d

    Remake on gl-error2d:

    • color may define per-bar colors.
    • max number of points extended 40 times (from 1e5 to 4e6) via instanced draw.
    • lineWidth and capSize are adjusted to actual pixels.
    • enhanced performance via vertex shader.

    Demo.

    Usage

    npm install regl-error2d

    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.

    Keywords

    Install

    npm i regl-error2d

    DownloadsWeekly Downloads

    107,557

    Version

    2.0.12

    License

    MIT

    Unpacked Size

    18.9 kB

    Total Files

    6

    Last publish

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