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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>DVD Bounce Tutorial</title>
<style>
body {
margin: 0;
background-color: #f4f4f5;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
/* Container: 560x560 squared rectangle as requested */
#container {
width: 660px;
height: 560px;
background-color: #fff;
display: flex;
box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
overflow: hidden;
border-radius: 8px;
}
/* Left: Code Editor */
#code-panel {
flex: 1;
background-color: #1f2325;
/* Dark editor bg */
color: #d6deeb;
font-family: 'Consolas', 'Monaco', monospace;
font-size: 11px;
/* Small font to fit */
padding: 10px;
overflow: hidden;
position: relative;
display: flex;
flex-direction: column;
}
#code-content {
line-height: 1.4;
}
/* Cursor effect */
.cursor::after {
content: '▋';
color: #00dc68;
animation: blink 1s step-end infinite;
}
@keyframes blink {
50% {
opacity: 0;
}
}
/* Right: Output Canvas */
#output-panel {
width: 280px;
/* Approx half */
background-color: #f4f4f5;
/* Match body bg */
position: relative;
display: flex;
justify-content: center;
align-items: center;
background-image: url('https://classpaddev.github.io/img/cp.svg');
background-size: 300px 713px;
background-position: -11px 24px;
background-repeat: no-repeat;
}
canvas {
background-color: #1f2325;
/* Screen bg */
width: 220px;
/* Scaled down from 320 to fit in panel */
height: 363px;
/* Scaled down from 528 */
image-rendering: pixelated;
box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
/* Optional: slight border radius to match screen if needed */
}
/* User provided code styling classes */
.ec-line {
margin: 0;
min-height: 1.4em;
}
.code {
display: inline-block;
}
.indent {
display: inline-block;
width: 2em;
}
#code-template {
font-family: var(--ec-uiFontFml);
font-size: var(--ec-uiFontSize);
font-weight: var(--ec-uiFontWg);
line-height: var(--ec-uiLineHt);
text-size-adjust: none;
-webkit-text-size-adjust: none
}
#code-template *:not(:is(svg, svg *)) {
all: revert;
box-sizing: border-box
}
#code-template pre {
display: flex;
margin: 0;
padding: 0;
border: var(--ec-brdWd) solid var(--ec-brdCol);
border-radius: calc(var(--ec-brdRad) + var(--ec-brdWd));
background: var(--ec-codeBg)
}
#code-template pre: focus-visible {
outline: 3px solid var(--ec-focusBrd);
outline-offset: -3px
}
#code-template pre>code {
all: unset;
display: block;
flex: 1 0 100%;
padding: var(--ec-codePadBlk) 0;
color: var(--ec-codeFg);
font-family: var(--ec-codeFontFml);
font-size: var(--ec-codeFontSize);
font-weight: var(--ec-codeFontWg);
line-height: var(--ec-codeLineHt)
}
#code-template pre {
overflow-x: auto
}
#code-template pre.wrap .ec-line .code {
white-space: pre-wrap;
overflow-wrap: break-word;
min-width: min(20ch, var(--ecMaxLine, 20ch))
}
#code-template pre.wrap .ec-line .code span.indent {
white-space: pre
}
</style>
</head>
<body>
<div id="container">
<div id="code-panel">
<div id="code-content"></div>
</div>
<div id="output-panel">
<canvas id="screen" width="320" height="528"></canvas>
</div>
</div>
<!-- Hidden Template with the User's HTML Code -->
<template id="code-template">
<div class="ec-line">
<div class="code"><span style="color:#C792EA">import</span><span style="color:#D6DEEB"> gint</span></div>
</div>
<div class="ec-line">
<div class="code"></div>
</div>
<div class="ec-line">
<div class="code"><span style="color:#82AAFF">DVD</span><span style="color:#D6DEEB"> </span><span
style="color:#C792EA">=</span><span style="color:#D6DEEB"> </span><span
style="color:#D9F5DD">[</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D"> </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> #### #### </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # ###### ### </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> ### # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> #### ##### # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # # # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # # # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # ##### # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # # # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> # # # # # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#D9F5DD">"</span><span
style="color:#ECC48D; white-space: pre;"> #### ##### # </span><span style="color:#D9F5DD">"</span><span
style="color:#D6DEEB">,</span></div>
</div>
<div class="ec-line">
<div class="code"><span style="color:#D9F5DD">]</span></div>
</div>
<div class="ec-line">
<div class="code"></div>
</div>
<div class="ec-line">
<div class="code"><span style="color:#82AAFF">DVD_W</span><span style="color:#D6DEEB"> </span><span
style="color:#C792EA">=</span><span style="color:#D6DEEB"> </span><span
style="color:#F78C6C">23</span></div>
</div>
<div class="ec-line">
<div class="code"><span style="color:#82AAFF">DVD_H</span><span style="color:#D6DEEB"> </span><span
style="color:#C792EA">=</span><span style="color:#D6DEEB"> </span><span
style="color:#F78C6C">16</span></div>
</div>
<div class="ec-line">
<div class="code"></div>
</div>
<div class="ec-line">
<div class="code"><span style="color:#C792EA">def</span><span style="color:#D6DEEB"> </span><span
style="color:#82AAFF">draw_logo</span><span style="color:#D9F5DD">(</span><span
style="color:#7FDBCA">x</span><span style="color:#D6DEEB">, </span><span
style="color:#7FDBCA">y</span><span style="color:#D6DEEB">, </span><span
style="color:#7FDBCA">color=</span><span style="color:#D6DEEB">gint.</span><span
style="color:#82AAFF">C_BLACK</span><span style="color:#D6DEEB">, </span><span
style="color:#7FDBCA">bg=</span><span style="color:#D6DEEB">gint.</span><span
style="color:#82AAFF">C_WHITE</span><span style="color:#D9F5DD">)</span><span
style="color:#D6DEEB">:</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#C792EA">for</span><span
style="color:#D6DEEB"> dy </span><span style="color:#C792EA">in</span><span style="color:#D6DEEB">
</span><span style="color:#C5E478">range</span><span style="color:#D6DEEB">(</span><span
style="color:#82AAFF">DVD_H</span><span style="color:#D6DEEB">):</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#C792EA">for</span><span
style="color:#D6DEEB"> dx </span><span style="color:#C792EA">in</span><span style="color:#D6DEEB">
</span><span style="color:#C5E478">range</span><span style="color:#D6DEEB">(</span><span
style="color:#82AAFF">DVD_W</span><span style="color:#D6DEEB">):</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#C792EA">if</span><span
style="color:#D6DEEB"> </span><span style="color:#F78C6C">0</span><span style="color:#D6DEEB">
</span><span style="color:#C792EA"><=</span><span style="color:#D6DEEB"> x</span><span
style="color:#C792EA">+</span><span style="color:#D6DEEB">dx </span><span
style="color:#C792EA"><</span><span style="color:#D6DEEB"> gint.</span><span
style="color:#82AAFF">DWIDTH</span><span style="color:#D6DEEB"> </span><span
style="color:#C792EA">and</span><span style="color:#D6DEEB"> </span><span
style="color:#F78C6C">0</span><span style="color:#D6DEEB"> </span><span
style="color:#C792EA"><=</span><span style="color:#D6DEEB"> y</span><span
style="color:#C792EA">+</span><span style="color:#D6DEEB">dy </span><span
style="color:#C792EA"><</span><span style="color:#D6DEEB"> gint.</span><span
style="color:#82AAFF">DHEIGHT</span><span style="color:#D6DEEB">:</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">pixel </span><span style="color:#C792EA">=</span><span style="color:#D6DEEB">
</span><span style="color:#82AAFF">DVD</span><span style="color:#D6DEEB">[dy]</span><span
style="color:#D9F5DD">[</span><span style="color:#D6DEEB">dx</span><span
style="color:#D9F5DD">]</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">gint.</span><span style="color:#B2CCD6">dpixel</span><span
style="color:#D6DEEB">(</span><span style="color:#82AAFF">x</span><span
style="color:#C792EA">+</span><span style="color:#82AAFF">dx</span><span
style="color:#D9F5DD">,</span><span style="color:#82AAFF"> y</span><span
style="color:#C792EA">+</span><span style="color:#82AAFF">dy</span><span
style="color:#D9F5DD">,</span><span style="color:#82AAFF"> color </span><span
style="color:#C792EA">if</span><span style="color:#82AAFF"> pixel </span><span
style="color:#C792EA">==</span><span style="color:#82AAFF"> </span><span
style="color:#D9F5DD">'</span><span style="color:#ECC48D">#</span><span
style="color:#D9F5DD">'</span><span style="color:#82AAFF"> </span><span
style="color:#C792EA">else</span><span style="color:#82AAFF"> bg</span><span
style="color:#D6DEEB">)</span></div>
</div>
<div class="ec-line">
<div class="code"></div>
</div>
<div class="ec-line">
<div class="code"><span style="color:#D6DEEB">x, y </span><span style="color:#C792EA">=</span><span
style="color:#D6DEEB"> </span><span style="color:#F78C6C">50</span><span style="color:#D6DEEB">,
</span><span style="color:#F78C6C">50</span></div>
</div>
<div class="ec-line">
<div class="code"><span style="color:#D6DEEB">dx, dy </span><span style="color:#C792EA">=</span><span
style="color:#D6DEEB"> </span><span style="color:#F78C6C">2</span><span style="color:#D6DEEB">,
</span><span style="color:#F78C6C">2</span></div>
</div>
<div class="ec-line">
<div class="code"><span style="color:#D6DEEB">bg </span><span style="color:#C792EA">=</span><span
style="color:#D6DEEB"> gint.</span><span style="color:#82AAFF">C_WHITE</span></div>
</div>
<div class="ec-line">
<div class="code" data-trigger="init"><span style="color:#D6DEEB">fg </span><span
style="color:#C792EA">=</span><span style="color:#D6DEEB"> gint.</span><span
style="color:#82AAFF">C_BLACK</span></div>
</div>
<div class="ec-line">
<div class="code"></div>
</div>
<div class="ec-line">
<div class="code" data-trigger="loop"><span style="color:#C792EA">while</span><span style="color:#D6DEEB">
</span><span style="color:#FF6A83">True</span><span style="color:#D6DEEB">:</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">gint.</span><span style="color:#B2CCD6">dclear</span><span
style="color:#D6DEEB">(</span><span style="color:#82AAFF">bg</span><span
style="color:#D6DEEB">)</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#B2CCD6">draw_logo</span><span
style="color:#D6DEEB">(</span><span style="color:#82AAFF">x</span><span
style="color:#D9F5DD">,</span><span style="color:#82AAFF"> y</span><span
style="color:#D9F5DD">,</span><span style="color:#82AAFF"> fg</span><span
style="color:#D9F5DD">,</span><span style="color:#82AAFF"> bg</span><span
style="color:#D6DEEB">)</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">gint.</span><span style="color:#B2CCD6">dupdate</span><span
style="color:#D6DEEB">()</span></div>
</div>
<div class="ec-line">
<div class="code"></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">x </span><span style="color:#C792EA">+=</span><span style="color:#D6DEEB">
dx</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">y </span><span style="color:#C792EA">+=</span><span style="color:#D6DEEB">
dy</span></div>
</div>
<div class="ec-line">
<div class="code"></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#C792EA">if</span><span
style="color:#D6DEEB"> x </span><span style="color:#C792EA"><=</span><span style="color:#D6DEEB">
</span><span style="color:#F78C6C">0</span><span style="color:#D6DEEB"> </span><span
style="color:#C792EA">or</span><span style="color:#D6DEEB"> x </span><span
style="color:#C792EA">+</span><span style="color:#D6DEEB"> </span><span
style="color:#82AAFF">DVD_W</span><span style="color:#D6DEEB"> </span><span
style="color:#C792EA">>=</span><span style="color:#D6DEEB"> gint.</span><span
style="color:#82AAFF">DWIDTH</span><span style="color:#D6DEEB">:</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">dx </span><span style="color:#C792EA">=</span><span style="color:#D6DEEB">
</span><span style="color:#C792EA">-</span><span style="color:#D6DEEB">dx</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#C792EA">if</span><span
style="color:#D6DEEB"> y </span><span style="color:#C792EA"><=</span><span style="color:#D6DEEB">
</span><span style="color:#F78C6C">0</span><span style="color:#D6DEEB"> </span><span
style="color:#C792EA">or</span><span style="color:#D6DEEB"> y </span><span
style="color:#C792EA">+</span><span style="color:#82AAFF">DVD_H</span><span style="color:#D6DEEB">
</span><span style="color:#C792EA">>=</span><span style="color:#D6DEEB"> gint.</span><span
style="color:#82AAFF">DHEIGHT</span><span style="color:#D6DEEB">:</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">dy </span><span style="color:#C792EA">=</span><span style="color:#D6DEEB">
</span><span style="color:#C792EA">-</span><span style="color:#D6DEEB">dy</span></div>
</div>
<div class="ec-line">
<div class="code"></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"><span style="color:#D6DEEB"> </span></span><span
style="color:#D6DEEB">ev </span><span style="color:#C792EA">=</span><span style="color:#D6DEEB">
gint.</span><span style="color:#B2CCD6">pollevent</span><span style="color:#D6DEEB">()</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#C792EA">if</span><span
style="color:#D6DEEB"> ev.type </span><span style="color:#C792EA">==</span><span
style="color:#D6DEEB"> gint.</span><span style="color:#82AAFF">KEYEV_DOWN</span><span
style="color:#D6DEEB"> </span><span style="color:#C792EA">and</span><span style="color:#D6DEEB">
ev.key </span><span style="color:#C792EA">==</span><span style="color:#D6DEEB"> gint.</span><span
style="color:#82AAFF">KEY_EXIT</span><span style="color:#D6DEEB">:</span></div>
</div>
<div class="ec-line">
<div class="code"><span class="indent"> </span><span style="color:#C792EA">break</span></div>
</div>
</template>
<script>
const canvas = document.getElementById('screen');
const ctx = canvas.getContext('2d', { alpha: false });
// --- Constants & Config ---
const DWIDTH = 320;
const DHEIGHT = 528;
const DVD_W = 23;
const DVD_H = 16;
// DVD Logo Data
const DVD = [
" ",
" #### #### ",
" # # # ",
" # # # ",
" # ###### ### ",
" # # ",
" # # ",
" ### # ",
" ",
" #### ##### # # ",
" # # # # # ",
" # # # # # ",
" # # ##### # # ",
" # # # # # ",
" # # # # # ",
" #### ##### # ",
];
// State
let x = 50, y = 50;
let dx = 2, dy = 2;
let bg = "#f4f4f5"; // Started as White in code
let fg = "#1f2325"; // Started as Black in code
let isSimulating = false;
// --- Drawing Logic ---
function draw_logo(posX, posY, color) {
ctx.fillStyle = color;
for (let r = 0; r < DVD_H; r++) {
const row = DVD[r];
for (let c = 0; c < DVD_W; c++) {
const px = posX + c;
const py = posY + r;
if (px >= 0 && px < DWIDTH && py >= 0 && py < DHEIGHT) {
const pixel = row[c];
if (pixel === '#') ctx.fillRect(px, py, 1, 1);
}
}
}
}
function clearScreen() {
ctx.fillStyle = bg;
ctx.fillRect(0, 0, DWIDTH, DHEIGHT);
}
function staticDraw() {
clearScreen();
draw_logo(x, y, fg);
}
function animationLoop() {
if (!isSimulating) return;
// Physics
x += dx;
y += dy;
if (x <= 0 || x + DVD_W >= DWIDTH) dx = -dx;
if (y <= 0 || y + DVD_H >= DHEIGHT) dy = -dy;
clearScreen();
draw_logo(Math.floor(x), Math.floor(y), fg);
requestAnimationFrame(animationLoop);
}
// --- Typing Simulation ---
const codePanel = document.getElementById('code-content');
const template = document.getElementById('code-template');
// Convert template content to array of line elements
const lines = Array.from(template.content.children).filter(n => n.nodeType === 1);
let currentLineIndex = 0;
function typeLine() {
if (currentLineIndex >= lines.length) {
// Restart after 60 seconds
setTimeout(restartTutorial, 60000);
return;
}
const lineNode = lines[currentLineIndex].cloneNode(true);
// Handle triggers from the source
const codeInner = lineNode.querySelector('.code');
const trigger = codeInner ? codeInner.getAttribute('data-trigger') : null;
// Append with cursor effect
lineNode.classList.add('cursor');
if (currentLineIndex > 0) {
// Remove cursor from previous line
// Check if previous sibling exists just in case
if (codePanel.children[currentLineIndex - 1]) {
codePanel.children[currentLineIndex - 1].classList.remove('cursor');
}
}
codePanel.appendChild(lineNode);
// Auto scroll
codePanel.parentElement.scrollTop = codePanel.parentElement.scrollHeight;
currentLineIndex++;
// Process Trigger
let delay = 100; // Normal typing speed (fast line by line)
if (trigger === 'init') {
// Execute Static Draw
staticDraw();
delay = 1000; // Pause after init to show result
} else if (trigger === 'loop') {
// Wait a bit then start animation
isSimulating = true;
requestAnimationFrame(animationLoop);
delay = 500;
}
// Next line
setTimeout(typeLine, delay);
}
function restartTutorial() {
// Reset State
isSimulating = false;
x = 50;
y = 50;
dx = 2;
dy = 2;
currentLineIndex = 0;
// Clear Code Panel
codePanel.innerHTML = '';
// Reset Screen
clearScreen();
// Start typing again
setTimeout(typeLine, 500);
}
// Start
// Initialize background
clearScreen();
// Start typing
setTimeout(typeLine, 500);
</script>
</body>
</html>