curriculum/challenges/english/blocks/learn-intermediate-oop-by-building-a-platformer-game/65afec8f02423144ef136a94.md
The width and the height of the main player, platforms and checkpoints will be proportional sized relative to the innerHeight of the browser screen. The goal is to make the game responsive and visually consistent across different screen sizes.
Inside your proportionalSize function, you will need to return a ternary that checks if innerHeight is less than 500. If so, return Math.ceil((size / 500) * innerHeight), otherwise return size.
Your proportionalSize function should have a return statement.
assert.match(proportionalSize.toString(), /return/);
Your proportionalSize function should return a ternary operator that checks if innerHeight is less than 500 and returns Math.ceil((size / 500) * innerHeight), otherwise returns size.
assert.match(code, /const\s+proportionalSize\s*=\s*(\(\s*size\s*\)|size)\s*=>\s*{\s*return\s+innerHeight\s*<\s*500\s*\?\s*Math\.ceil\(\s*\(\s*size\s*\/\s*500\s*\)\s*\*\s*innerHeight\s*\)\s*:\s*size\s*;?\s*}\s*/);
<!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" />
<title>Learn Intermediate OOP by Building a Platformer Game</title>
<link rel="stylesheet" href="./styles.css" />
</head>
<body>
<div class="start-screen">
<h1 class="main-title">freeCodeCamp Code Warrior</h1>
<p class="instructions">
Help the main player navigate to the yellow checkpoints.
</p>
<p class="instructions">
Use the keyboard arrows to move the player around.
</p>
<p class="instructions">You can also use the spacebar to jump.</p>
<div class="btn-container">
<button class="btn" id="start-btn">Start Game</button>
</div>
</div>
<div class="checkpoint-screen">
<h2>Congrats!</h2>
<p>You reached the last checkpoint.</p>
</div>
<canvas id="canvas"></canvas>
<script src="./script.js"></script>
</body>
</html>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
:root {
--main-bg-color: #0a0a23;
--section-bg-color: #ffffff;
--golden-yellow: #feac32;
}
body {
background-color: var(--main-bg-color);
}
.start-screen {
background-color: var(--section-bg-color);
width: 100%;
position: absolute;
top: 50%;
left: 50%;
margin-right: -50%;
transform: translate(-50%, -50%);
border-radius: 30px;
padding: 20px;
padding-bottom: 5px;
}
.main-title {
text-align: center;
}
.instructions {
text-align: center;
font-size: 1.2rem;
margin: 15px;
line-height: 2rem;
}
.btn {
cursor: pointer;
width: 100px;
margin: 10px;
color: #0a0a23;
font-size: 18px;
background-color: var(--golden-yellow);
background-image: linear-gradient(#fecc4c, #ffac33);
border-color: var(--golden-yellow);
border-width: 3px;
}
.btn:hover {
background-image: linear-gradient(#ffcc4c, #f89808);
}
.btn-container {
display: flex;
align-items: center;
justify-content: center;
}
.checkpoint-screen {
position: absolute;
left: 0;
right: 0;
margin-left: auto;
margin-right: auto;
width: 100%;
text-align: center;
background-color: var(--section-bg-color);
border-radius: 20px;
padding: 10px;
display: none;
}
#canvas {
display: none;
}
@media (min-width: 768px) {
.start-screen {
width: 60%;
max-width: 700px;
}
.checkpoint-screen {
max-width: 300px;
}
}
const startBtn = document.getElementById("start-btn");
const canvas = document.getElementById("canvas");
const startScreen = document.querySelector(".start-screen");
const checkpointScreen = document.querySelector(".checkpoint-screen");
const checkpointMessage = document.querySelector(".checkpoint-screen > p");
const ctx = canvas.getContext("2d");
canvas.width = innerWidth;
canvas.height = innerHeight;
const gravity = 0.5;
let isCheckpointCollisionDetectionActive = true;
--fcc-editable-region--
const proportionalSize = (size) => {
};
--fcc-editable-region--