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import Tone from 'tone'
import keys from './lib/keys'
import color from './lib/color'
import { browser, requestAudioContext, clamp, choice, firstTouch } from './lib/util'
const compressor = new Tone.Compressor(-30, 3).toMaster()
const GRAIN_TIME = 1/2
const SAMPLE_RATE = 44100
const GRAIN_SIZE = GRAIN_TIME * SAMPLE_RATE
requestAudioContext( () => {
const clock = new Tone.Clock(tick, 1/GRAIN_TIME)
clock.start()
console.log('ready')
})
let offsets = []
let loading = true
let player = new Tone.MultiPlayer({
applause: 'applause.mp3',
}, () => {
loading = false
let data = player.buffers.get('applause').get().getChannelData(0)
let intensities = []
for (let i = 0, len = Math.floor(data.length / GRAIN_SIZE); i < len; i++) {
let z = 0
for (let j = i * GRAIN_SIZE, max = (i+1) * GRAIN_SIZE; j < max; j++) {
z += Math.abs(data[j])
}
intensities[i] = [z / GRAIN_SIZE, i]
}
offsets = intensities.sort( (a,b) => a[0] < b[0] ? -1 : a[0] == b[0] ? 0 : 1 )
.map( (a,i) => {
return a[1]
})
})
player.fadeIn = 0.25
player.fadeOut = 0.25
player.connect(compressor)
let intensity = 0, inertialIntensity = 0, inertia = 5
function tick (time) {
if (! offsets.length) return
// let offsetIndex = clamp( Math.floor(mouse.y * offsets.length + Math.cos(time/20)), 0, offsets.length-1 )
inertialIntensity = Math.max(intensity, (intensity + inertialIntensity*(inertia-1))/inertia)
let offsetIntensity = 0.94 * inertialIntensity + 0.02
let offsetIndex = Math.floor(offsetIntensity * offsets.length + Math.cos(time))
let offset = Math.max((offsets[offsetIndex] || 0) * GRAIN_TIME + ( 0.25 * Math.sin(time*17/7) ), 0)
player.start('applause', time, offset, GRAIN_TIME * 4, 0, inertialIntensity)
}
let mouse = { x: window.innerWidth/2, y: window.innerHeight/2 }
let drawing = false
let canvas = document.createElement('canvas')
canvas.width = window.innerWidth
canvas.height = window.innerHeight
let ctx = canvas.getContext('2d')
document.body.appendChild(canvas)
function down (e) {
drawing = true
mouse.x = e.pageX / window.innerWidth
mouse.y = e.pageY / window.innerHeight
}
function move (e){
const x = e.pageX / window.innerWidth
const y = e.pageY / window.innerHeight
const dx = (mouse.x - x)
const dy = (mouse.y - y)
const v = Math.sqrt(dx*dx+dy*dy)
if (drawing) {
intensity = Math.min(0.999, intensity + v*0.1)
inertialIntensity = Math.min(0.999, intensity)
if (intensity == 0.999) intensity -= (Math.random() * 0.4)
if (inertialIntensity == 0.999) inertialIntensity -= (Math.random() * 0.3)
ctx.fillStyle = color(intensity)
ctx.beginPath()
ctx.arc( x*window.innerWidth, y*window.innerHeight, v*500, 0, Math.PI*2 )
ctx.fill()
}
mouse.x = x
mouse.y = y
}
function up (e) {
drawing = false
intensity = 0
}
setInterval( () => {
inertialIntensity += 0.001
}, 5000)
if (browser.isMobile) {
document.body.addEventListener('touchstart', firstTouch(down))
document.body.addEventListener('touchmove', firstTouch(move))
window.addEventListener('touchend', firstTouch(up))
}
else {
document.body.addEventListener('mousedown', down)
document.body.addEventListener('mousemove', move)
window.addEventListener('mouseup', up)
}
const fonts = ['Arial','Helvetica','Comic Sans MS','Chalkboard','Georgia']
function animate(t){
requestAnimationFrame(animate)
ctx.save()
ctx.fillStyle=color(inertialIntensity/2)
ctx.globalAlpha = 0.4
const w = canvas.width
const h = canvas.height
ctx.save()
ctx.translate(w/2,h/2)
ctx.rotate(mouse.x)
ctx.translate(-w/2,-h/2)
ctx.drawImage(canvas, -2, -2, w+10, h+10)
ctx.restore()
ctx.globalAlpha = 0.02 * Math.random()
ctx.fillRect(0, 0, w, h)
ctx.fillStyle='#000'
ctx.fillRect(0, 0, w, h)
ctx.restore()
}
animate()
load()
function load() {
if (loading) setTimeout(load, 10)
ctx.font = "100px " + choice(fonts)
ctx.fillStyle=color(Math.random())
ctx.fillText("LOADING!",window.innerWidth/2-250,window.innerHeight/2)
}
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