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Canvas Tutorial
{
const width = 300
const height = 300
const canvas = html`<canvas width = ${width} height = ${height} style = "border:1px solid black"/>`
const ctx = canvas.getContext("2d")
const segSize = 10
const stepSize = 2
const framesPerTick = segSize/stepSize
let x = 150
let y = 150
let theta = d3.randomUniform(0,2*Math.PI)()
let tick = 0
let frame = 0
function loop(){
ctx.beginPath()
ctx.moveTo(x,y)
x = x + stepSize*Math.cos(theta)
y = y + stepSize*Math.sin(theta)
ctx.lineTo(x,y)
ctx.stroke()
ctx.closePath()
if(frame%framesPerTick == 0){
tick = tick + 1
theta = d3.randomUniform(0,2*Math.PI)()
}
if(tick < 100){
frame = frame + 1
window.requestAnimationFrame(loop)
}
}
window.requestAnimationFrame(loop)
return canvas
}
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