<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
body {
padding: 0;
margin: 0;
}
.container {
display: inline-flex;
flex-direction: column;
width: 95em;
}
.example {
display: flex;
align-items: center;
justify-content: space-between;
position: relative;
margin: 4em 5em;
background-color: #ccc;
}
.example > style, .example > noscript > style {
display: block;
font-family: monospace;
margin: 0 3em 0 10em;
}
.box {
display: block;
width: 3em;
height: 3em;
border: solid 1px;
background-color: palegreen;
}
.original {
position: absolute;
left: 0;
top: 0;
opacity: 20%;
}
</style>
</head>
<body>
<p>This is based on the examples for <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/transform-origin">transform-origin</a>
on MDN</p>
<div class="container">
<h1>css-transforms-1</h1>
<div class="example">
<div>
<div id="box1" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box1 {
transform: none;
}</style>
</div>
<div class="example">
<div>
<div id="box2" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box2 {
transform: scale(1.7);
}</style>
</div>
<div class="example">
<div>
<div id="box3" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box3 {
transform: scale(1.7);
transform-origin: 0 0;
}</style>
</div>
<div class="example">
<div>
<div id="box4" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box4 {
transform: scale(1.7);
transform-origin: 100% -30%;
}</style>
</div>
<div class="example">
<div>
<div id="box5" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box5 {
transform: translate(20px, 20px);
}</style>
</div>
<div class="example">
<div>
<div id="box6" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box6 {
transform: translate(50%, 10%);
}</style>
</div>
<div class="example">
<div>
<div id="box7" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box7 {
transform: rotate(30deg);
}</style>
</div>
<div class="example">
<div>
<div id="box8" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box8 {
transform: rotate(30deg);
transform-origin: 0 0;
}</style>
</div>
<div class="example">
<div>
<div id="box9" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box9 {
transform: rotate(30deg);
transform-origin: 100% 100%;
}</style>
</div>
<div class="example">
<div>
<div id="box10" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box10 {
transform: rotate(30deg);
transform-origin: -1em -3em;
}</style>
</div>
<div class="example">
<div>
<div id="box11" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box11 {
transform: skewX(50deg);
transform-origin: 100% -30%;
}</style>
</div>
<div class="example">
<div>
<div id="box12" class="box"> </div>
<div class="box original"> </div>
</div>
<style>#box12 {
transform: skewY(50deg);
transform-origin: 100% -30%;
}</style>
</div>
<h1>css-transforms-2</h1>
<div class="example">
<div>
<div id="box13" class="box"> </div>
<div class="box original"> </div>
</div>
<style id="box13-style">
</style>
<noscript>
<style>#box13 {
transform: rotateX(60deg);
transform-origin: 50% 50%;
}</style>
</noscript>
</div>
<div class="example">
<div>
<div id="box14" class="box"> </div>
<div class="box original"> </div>
</div>
<style id="box14-style">
</style>
<noscript>
<style>#box14 {
transform: rotateY(60deg);
transform-origin: 50% 50%;
}</style>
</noscript>
</div>
<div class="example">
<div>
<div id="box15" class="box"> </div>
<div class="box original"> </div>
</div>
<style id="box15-style">
</style>
<noscript>
<style>#box15 {
transform: rotateZ(60deg);
transform-origin: 50% 50%;
}</style>
</noscript>
</div>
<div class="example">
<div>
<div id="box16" class="box"> </div>
<div class="box original"> </div>
</div>
<style id="box16-style">
</style>
<noscript>
<style>#box16 {
transform: rotateX(60deg) rotateY(60deg) rotateZ(60deg);
transform-origin: 50% 50%;
}</style>
</noscript>
</div>
<div class="example">
<div>
<div id="box17" class="box"> </div>
<div class="box original"> </div>
</div>
<style id="box17-style">
</style>
<noscript>
<style>#box17 {
transform: matrix3d(
1.00, 0.00, 0.00, 0.00,
0.00, 0.50, -0.87, 0.00,
0.00, 0.87, 0.50, 0.00,
0.00, 0.00, 0.00, 1.00
);
transform-origin: 50% 50%;
}</style>
</noscript>
</div>
<div class="example">
<div>
<div id="box18" class="box"> </div>
<div class="box original"> </div>
</div>
<style id="box18-style">
</style>
<noscript>
<style>#box18 {
transform: matrix3d(
0.50, 0.00, 0.87, 0.00,
0.00, 1.00, 0.00, 0.00,
-0.87, 0.00, 0.50, 0.00,
0.00, 0.00, 0.00, 1.00
);
transform-origin: 50% 50%;
}</style>
</noscript>
</div>
<div class="example">
<div>
<div id="box19" class="box"> </div>
<div class="box original"> </div>
</div>
<style id="box19-style">
</style>
<noscript>
<style>#box19 {
transform: matrix3d(
0.50, -0.87, 0.00, 0.00,
0.87, 0.50, 0.00, 0.00,
0.00, 0.00, 1.00, 0.00,
0.00, 0.00, 0.00, 1.00
);
transform-origin: 50% 50%;
}</style>
</noscript>
</div>
<div class="example">
<div>
<div id="box20" class="box"> </div>
<div class="box original"> </div>
</div>
<style id="box20-style">
</style>
<noscript>
<style>#box20 {
transform: matrix3d(
0.25, -0.43, 0.87, 0.00,
0.81, -0.40, -0.43, 0.00,
0.53, 0.81, 0.25, 0.00,
0.00, 0.00, 0.00, 1.00
);
transform-origin: 50% 50%;
}</style>
</noscript>
</div>
<script>
"use strict";
const box13 = document.getElementById("box13");
const box13Style = document.getElementById("box13-style");
const box14 = document.getElementById("box14");
const box14Style = document.getElementById("box14-style");
const box15 = document.getElementById("box15");
const box15Style = document.getElementById("box15-style");
const box16 = document.getElementById("box16");
const box16Style = document.getElementById("box16-style");
const box17 = document.getElementById("box17");
const box17Style = document.getElementById("box17-style");
const box18 = document.getElementById("box18");
const box18Style = document.getElementById("box18-style");
const box19 = document.getElementById("box19");
const box19Style = document.getElementById("box19-style");
const box20 = document.getElementById("box20");
const box20Style = document.getElementById("box20-style");
let rotationAmount = 0;
function matrixMultiply(left, right) {
// This assumes left and right are the same size for simplicity.
const length = left.length;
const product = [
[],
[],
[],
[],
]
for (let i = 0; i < length; ++i) {
for (let j = 0; j < length; ++j) {
product[i][j] = left[i][0] * right[0][j] + left[i][1] * right[1][j] + left[i][2] * right[2][j] + left[i][3] * right[3][j];
}
}
return product;
}
function rotationMatrix(xAxis, yAxis, zAxis, angle) {
const radians = angle * (Math.PI / 180);
const sine = Math.sin(radians);
const cosine = Math.cos(radians);
const t = 1 - cosine;
return [
[t * xAxis * xAxis + cosine, t * xAxis * yAxis - zAxis * sine, t * xAxis * zAxis + yAxis * sine, 0],
[t * xAxis * yAxis + zAxis * sine, t * yAxis * yAxis + cosine, t * yAxis * zAxis - xAxis * sine, 0],
[t * xAxis * zAxis - yAxis * sine, t * yAxis * zAxis + xAxis * sine, t * zAxis * zAxis + cosine, 0],
[0, 0, 0, 1],
];
}
function setStyle(element, styleElement, transform) {
styleElement.innerText = `
#${element.id} { transform: ${transform}; transform-origin: 50% 50%; }
`
}
function matrixRowToString(matrixRow, endWithComma = true) {
return `${matrixRow[0].toFixed(2)}, ${matrixRow[1].toFixed(2)}, ${matrixRow[2].toFixed(2)}, ${matrixRow[3].toFixed(2)}${endWithComma ? ',' : ''}`;
}
function setMatrix3dStyle(element, styleElement, matrix) {
styleElement.innerText = `#${element.id} { transform: matrix3d(${matrixRowToString(matrix[0])} ${matrixRowToString(matrix[1])} ${matrixRowToString(matrix[2])} ${matrixRowToString(matrix[3], false)}); transform-origin: 50% 50%; }`;
}
function animateCssTransformsTwo() {
rotationAmount++;
rotationAmount %= 360;
setStyle(box13, box13Style, `rotateX(${rotationAmount}deg)`);
setStyle(box14, box14Style, `rotateY(${rotationAmount}deg)`);
setStyle(box15, box15Style, `rotateZ(${rotationAmount}deg)`);
setStyle(box16, box16Style, `rotateX(${rotationAmount}deg) rotateY(${rotationAmount}deg) rotateZ(${rotationAmount}deg)`);
const xRotationMatrix = rotationMatrix(1, 0, 0, rotationAmount);
const yRotationMatrix = rotationMatrix(0, 1, 0, rotationAmount);
const zRotationMatrix = rotationMatrix(0, 0, 1, rotationAmount);
setMatrix3dStyle(box17, box17Style, xRotationMatrix);
setMatrix3dStyle(box18, box18Style, yRotationMatrix);
setMatrix3dStyle(box19, box19Style, zRotationMatrix);
setMatrix3dStyle(box20, box20Style, matrixMultiply(matrixMultiply(xRotationMatrix, yRotationMatrix), zRotationMatrix));
requestAnimationFrame(animateCssTransformsTwo);
}
requestAnimationFrame(animateCssTransformsTwo);
const xRotationMatrix = rotationMatrix(1, 0, 0, 60);
const yRotationMatrix = rotationMatrix(0, 1, 0, 60);
const zRotationMatrix = rotationMatrix(0, 0, 1, 60);
</script>
</div>
</body>
</html>
