Tell us what’s happening:
I am supposed to use the addition assignment operator += to add the velocity’s x coordinate to the player’s x position but the code is not passing. What am I missing?
Your code so far
<!-- file: index.html -->
<!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>
/* file: styles.css */
* {
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;
}
}
/* file: script.js */
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;
const proportionalSize = (size) => {
return innerHeight < 500 ? Math.ceil((size / 500) * innerHeight) : size;
}
class Player {
constructor() {
this.position = {
x: proportionalSize(10),
y: proportionalSize(400),
};
this.velocity = {
x: 0,
y: 0,
};
this.width = proportionalSize(40);
this.height = proportionalSize(40);
}
draw() {
ctx.fillStyle = "#99c9ff";
ctx.fillRect(this.position.x, this.position.y, this.width, this.height);
}
// User Editable Region
update() {
this.draw();
this.velocity.x += this.position.x;
}
// User Editable Region
}
Your browser information:
User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 Edg/123.0.0.0
Challenge Information:
Learn Intermediate OOP by Building a Platformer Game - Step 23
