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07b_dynamic_to_an_array_of_values.html
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07b_dynamic_to_an_array_of_values.html
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<!doctype html>
<html lang="en">
<head>
<title>Tween.js / dynamic to large interpolation array</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style>
body {
margin: 0px;
}
#scene1,
#scene2 {
display: inline-block;
font-size: 13px;
padding-right: 32px;
}
</style>
<link href="css/style.css" media="screen" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="info" style="position: relative">
<h1><a href="http://github.com/tweenjs/tween.js">tween.js</a></h1>
<h2>07b _ dynamic to large interpolation array</h2>
<p>tweening towards many random moving targets</p>
<div id="scene1">
<p><code>.dynamic(false)</code></p>
</div>
<div id="scene2">
<p><code>.dynamic(true)</code></p>
</div>
</div>
<script src="../dist/tween.umd.js"></script>
<script type="module">
import {drawRabbit, drawFox} from './js/drawings.js'
var width = 480
var height = 320
var rabbitValues = {x: [], y: [], eatenCounter: []}
// generate random rabbits
const rabbitCount = 20
for (var i = 0; i < rabbitCount; i++) {
rabbitValues.x.push(50 + getRandomInt(width - 100))
rabbitValues.y.push(50 + getRandomInt(height - 100))
rabbitValues.eatenCounter.push(i + 1)
}
// or use static population
// const rabbitCount = 2
// rabbitValues.x = [Math.random() * width, width - 50]
// rabbitValues.y = [height - 50, Math.random() * height]
// rabbitValues.eatenCounter = [1, 2]
var bunnyDestinations = []
for (var i = 0; i < rabbitCount; i++) {
bunnyDestinations.push({x: Math.random() * width, y: Math.random() * height})
}
var bunnyColors = []
const maxColor = 200 // avoiding pale colors
for (var i = 0; i < rabbitCount; i++) {
bunnyColors.push(`rgb(${getRandomInt(maxColor)}, ${getRandomInt(maxColor)}, ${getRandomInt(maxColor)})`)
}
startScene('scene1', false)
startScene('scene2', true)
function startScene(id, dynamic) {
var context
var rabbits
var fox
init()
animate()
function init() {
var duration = 8000
var scene = document.getElementById(id)
var canvas = document.createElement('canvas')
canvas.width = width
canvas.height = height
scene.appendChild(canvas)
context = canvas.getContext('2d')
var rabbitTweens = []
rabbits = []
// clone rabbitValues so it won't be modified (that way it will be unique for each scene)
const _rabbitValues = {
x: [...rabbitValues.x],
y: [...rabbitValues.y],
eatenCounter: [...rabbitValues.eatenCounter],
}
for (var i = 0; i < rabbitCount; i++) {
var rabbit = {
x: _rabbitValues.x[i],
y: _rabbitValues.y[i],
color: bunnyColors[i],
alive: true,
}
rabbits.push(rabbit)
rabbitTweens.push(createRabbitTween(i, rabbit))
}
function createRabbitTween(index, rabbit) {
return new TWEEN.Tween(rabbit)
.to(bunnyDestinations[index], duration)
.onUpdate(function (object) {
// We need `index + 1` because Tween modifies the arrays and adds the fox start values to it.
// TODO this is confusing. Better if Tween simply never modified the input object.
_rabbitValues.x[index + 1] = object.x
_rabbitValues.y[index + 1] = object.y
})
.start()
}
fox = {x: 50, y: 50, eatenCounter: 0}
var rabbitsEaten = 0
new TWEEN.Tween(fox)
.to(_rabbitValues, duration)
.dynamic(dynamic)
.onUpdate(function (object) {
rabbitsEaten = Math.floor(object.eatenCounter)
if (rabbitsEaten > 0) {
// A dead rabbit stops moving.
rabbitTweens[rabbitsEaten - 1].stop()
rabbits[rabbitsEaten - 1].alive = false
}
})
.start()
}
function animate(time) {
const stillRunning = TWEEN.update(time)
// draw background
context.fillStyle = 'rgb(240,250,240)'
context.fillRect(0, 0, width, height)
for (const rabbit of rabbits) drawRabbit(context, rabbit.x, rabbit.y, rabbit.color, rabbit.alive ? 1 : 0.1)
drawFox(context, fox.x, fox.y, 'rgb(200,80,80)')
if (stillRunning) requestAnimationFrame(animate)
else console.log('Done with animation, stopped rendering.')
}
}
function getRandomInt(max) {
return Math.floor(Math.random() * Math.floor(max + 1))
}
</script>
</body>
</html>