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circles.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body {
margin: 0;
height: 100vh;
display: flex;
flex-direction: column;
align-items: center;
}
.circle, .container, .all-sliders {
display: flex;
justify-content: center;
align-items: center;
}
.circle {
border-radius: 50%;
border: solid black 1px;
}
.container {
width: 100%;
height: 100%;
}
.all-sliders {
width: 100%;
}
.slider {
text-align: center;
width: 100%;
margin: 0 1rem;
}
input[type=range] {
width: calc( min( 15rem, 100% ) );
}
</style>
<title>Circles</title>
</head>
<body>
<div class="all-sliders">
<div class="slider">
<p class="circles-amt-val"></p>
<input type="range" min="1" max="50" value="10" class="circles-amt">
</div>
<div class="slider">
<p class="size-val"></p>
<input type="range" min="50" max="100" value="75" class="size">
</div>
<div class="slider">
<p class="weight-val"></p>
<input type="range" min="0" max="100" value="50" class="weight">
</div>
</div>
<div class="container"></div>
<script>
const body = document.querySelector('body')
const container = document.querySelector('.container')
const circlesAmtRange = document.querySelector('.circles-amt')
const sizeRange = document.querySelector('.size')
const weightRange = document.querySelector('.weight')
const circlesAmtValue = document.querySelector('.circles-amt-val')
const sizeValue = document.querySelector('.size-val')
const weightValue = document.querySelector('.weight-val')
const renderCircles = () => {
const circlesAmt = circlesAmtRange.value
const maxSize = sizeRange.value
const weight = weightRange.value / 100
const calcSize = (index) => {
const xVal = index / circlesAmt
const multiplier = (weight * (Math.pow(xVal, 3))) + ((1 - weight) * xVal)
return maxSize - ((maxSize / circlesAmt) * (multiplier * circlesAmt))
}
const insertCircles = (amount, element) => {
const circle = document.createElement('div')
circle.classList.add('circle')
const size = `${calcSize(circlesAmt - amount)}px`
circle.style.width = size
circle.style.height = size
element.appendChild(circle)
if (amount > 1) insertCircles(amount - 1, circle)
}
container.innerHTML = ''
insertCircles(circlesAmt, container)
}
const updateMaxSize = () => {
const currentRatio = sizeRange.value / sizeRange.max
sizeRange.max = Math.min(container.offsetWidth, container.offsetHeight) - 20
sizeRange.value = sizeRange.max * currentRatio
}
const renderCirclesAmt = () => {
const circlesAmt = circlesAmtRange.value
circlesAmtValue.innerHTML = `Circles: ${circlesAmt}`
}
const renderSize = () => {
const maxSize = sizeRange.value
sizeValue.innerHTML = `Size: ${maxSize}px`
}
const renderWeight = () => {
const weight = weightRange.value / 100
weightValue.innerHTML = `Weight: ${weight}`
}
const onRangeChange = (rangeElement, callback) => {
let callbackCalled, currentValue, previousValue
rangeElement.addEventListener('input', e => {
callbackCalled = true
currentValue = e.target.value
if(currentValue !== previousValue) callback(e)
previousValue = currentValue
})
rangeElement.addEventListener('change', e => {
if (!callbackCalled) callback(e)
})
}
onRangeChange(circlesAmtRange, () => {
renderCirclesAmt()
renderCircles()
})
onRangeChange(sizeRange, () => {
renderSize()
renderCircles()
})
onRangeChange(weightRange, () => {
renderWeight()
renderCircles()
})
window.addEventListener('resize', () => {
updateMaxSize()
renderSize()
renderCircles()
})
window.addEventListener('load', () => {
renderCirclesAmt()
renderWeight()
setTimeout(() => {
updateMaxSize()
renderSize()
renderCircles()
}, 0)
})
</script>
</body>
</html>