Part of a tutorial by Jim Vallandingham introducing regl for data visualization.
Read it Here: Intro to regl
Blocks associated with this tutorial:
Last active
September 25, 2017 01:43
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regl dots basic
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| <!DOCTYPE html> | |
| <title>Simple regl Dots Example</title> | |
| <body> | |
| <script src="https://npmcdn.com/regl@1.3.0/dist/regl.js"></script> | |
| <script src="index.js"></script> | |
| </body> |
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| // In practice, you would probably import/require regl | |
| // const regl = require('regl')(); | |
| // In this block, it is already loaded, so we just | |
| // initialize it. For more info, see: | |
| // https://github.com/regl-project/regl#standalone-script-tag | |
| var regl = createREGL(); | |
| var drawDots = regl({ | |
| frag: ` | |
| precision mediump float; | |
| uniform vec4 color; | |
| void main () { | |
| gl_FragColor = color; | |
| }`, | |
| vert: ` | |
| precision mediump float; | |
| attribute vec2 position; | |
| // @change acquire the pointWidth uniform | |
| // this is set by the uniforms section below | |
| uniform float pointWidth; | |
| void main () { | |
| // @change Set gl_PointSize global to | |
| // configure point size | |
| gl_PointSize = pointWidth; | |
| gl_Position = vec4(position, 0, 1); | |
| }`, | |
| attributes: { | |
| position: function(context, props) { | |
| // @change I tweaked the constants here so | |
| // the dots are not off the screen | |
| return [ | |
| [-1 * Math.cos(context.tick / 100), 0.2], | |
| [Math.sin(context.tick / 100), -0.8], | |
| [Math.sin(context.tick / 100), 0.8] | |
| ]; | |
| } | |
| }, | |
| uniforms: { | |
| color: function(context, props) { | |
| return props.color; | |
| }, | |
| // @change: Add a pointWidth uniform - | |
| // set by a prop | |
| pointWidth: regl.prop('pointWidth') | |
| }, | |
| count: 3, | |
| // @change: Set our primitive to points | |
| primitive: 'points' | |
| }) | |
| regl.frame(function(context) { | |
| drawDots({ | |
| color: [0.208, 0.304, 1.000, 1.000], | |
| // @change: Pass in the pointWidth prop | |
| pointWidth: 10.0 | |
| }); | |
| }); |
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