From 082abf9998dd3ab24c57b86771817898248163dc Mon Sep 17 00:00:00 2001
From: Luke Wilde <lukew@serenityos.org>
Date: Sat, 1 Oct 2022 01:58:35 +0100
Subject: [PATCH] Base: Add rotateX, rotateY, rotateZ and matrix3d examples for
 transform

---
 Base/res/html/misc/transform.html | 242 +++++++++++++++++++++++++++++-
 1 file changed, 240 insertions(+), 2 deletions(-)

diff --git a/Base/res/html/misc/transform.html b/Base/res/html/misc/transform.html
index 141dca6501..58c09eb72b 100644
--- a/Base/res/html/misc/transform.html
+++ b/Base/res/html/misc/transform.html
@@ -11,7 +11,7 @@
         .container {
             display: inline-flex;
             flex-direction: column;
-            width: 60em;
+            width: 95em;
         }
 
         .example {
@@ -23,7 +23,7 @@
             background-color: #ccc;
         }
 
-        .example > style {
+        .example > style, .example > noscript > style {
             display: block;
             font-family: monospace;
             margin: 0 3em 0 10em;
@@ -49,6 +49,7 @@
 <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">&nbsp;</div>
@@ -164,6 +165,243 @@
             transform-origin: 100% -30%;
         }</style>
     </div>
+    <h1>css-transforms-2</h1>
+    <div class="example">
+        <div>
+            <div id="box13" class="box">&nbsp;</div>
+            <div class="box original">&nbsp;</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">&nbsp;</div>
+            <div class="box original">&nbsp;</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">&nbsp;</div>
+            <div class="box original">&nbsp;</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">&nbsp;</div>
+            <div class="box original">&nbsp;</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">&nbsp;</div>
+            <div class="box original">&nbsp;</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">&nbsp;</div>
+            <div class="box original">&nbsp;</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">&nbsp;</div>
+            <div class="box original">&nbsp;</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">&nbsp;</div>
+            <div class="box original">&nbsp;</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>