regl-scatter2d

Fast and precise 2d scatter plot for lots of points.

Remake on gl-scatter2d, covering other scatter-related components.

Demo.

Usage

let regl = require('regl')({extensions: 'oes_element_index_uint'})

let createScatter = require('regl-scatter2d')

let scatter = createScatter(regl)

//draw 5 points
scatter({
  positions: [0,0, 1,0, 2,0, 1,1, 2,1],
  color: 'rgba(0, 100, 200, .75)'
})

createScatter(regl)

Create new scatter plot instance from regl. regl instance should have OES_element_index_uint extension enabled.

scatter(optionsA, optionsB, ...rest)

Draw scatter points corresponding to options.

// render multiple point groups
scatter(
  { points: [0,0, 1,1], color: 'blue', marker: null },
  { points: [0,1, 1,0], color: 'red', marker: someSdf }
)

scatter.update(optionsA, optionsB, ...rest)

Update options corresponding to passes, not incurring redraw. Passing null will remove previously loaded pass.

// update 3 passes
scatter.update(a, b, c)

// update 1st pass, remove 2nd pass, ignore 3rd pass
scatter.update(a, null)

// update 2nd pass (former 3rd pass)
scatter.update(null, b)

// update n-th pass
scatter.update.apply(scatter, Array.from({length: 10, 9: options}))

scatter.draw(id1|els1?, id2|els2?, ...)

Draw groups corresponding to ids, optionally specify marker ids to draw via els:

// create 3 groups of points
scatter.update(
  {points: [0,1, 1,0], color: 'red', marker: squareSdf},
  {points: [1,2, 2,1], color: 'green', marker: triangleSdf},
  {points: [0,0, 1,1], color: 'blue', marker: null}
)

// draw all groups
scatter.draw()

// draw red group
scatter.draw(0)

// draw green and blue group
scatter.draw(1, 2)

// draw the second point of the blue group and the first point of the red group
scatter.draw([1], null, [0])

scatter.destroy()

Dispose scatter instance and associated resources.

Related

• regl-line2d
• regl-error2d

Similar

• pts

License

© 2017 Dmitry Yv. MIT License

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