Learn Intermediate OOP by Building a Platformer Game - Step 42

JavaScript
1

Tell us what’s happening:

You should have an if statement that checks if the right key was pressed and the player’s x position is less than 400.how can i check for right key is pressed or not??

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;

class Player {
  constructor() {
    this.position = {
      x: 10,
      y: 400,
    };
    this.velocity = {
      x: 0,
      y: 0,
    };
    this.width = 40;
    this.height = 40;
  }
  draw() {
    ctx.fillStyle = "#99c9ff";
    ctx.fillRect(this.position.x, this.position.y, this.width, this.height);
  }
  
  update() {
    this.draw();
    this.position.x += this.velocity.x;
    this.position.y += this.velocity.y;

    if (this.position.y + this.height + this.velocity.y <= canvas.height) {
      if (this.position.y < 0) {
        this.position.y = 0;
        this.velocity.y = gravity;
      }
      this.velocity.y += gravity;
    } else {
      this.velocity.y = 0;
    }

    if (this.position.x < this.width) {
      this.position.x = this.width;
    }
  }
}

const player = new Player();


// User Editable Region


const animate = () => {
  requestAnimationFrame(animate);
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  player.update();
  if(this.position.x<400){

  }
}


// User Editable Region


const keys = {
  rightKey: {
    pressed: false
  },
  leftKey: {
    pressed: false
  }
};

const startGame = () => {
  canvas.style.display = "block";
  startScreen.style.display = "none";
  player.draw();
}

startBtn.addEventListener("click", startGame);

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Challenge Information:

Learn Intermediate OOP by Building a Platformer Game - Step 42

2

you have these to use to check if the key is pressed or not

3 
if(  keys.rightKey.pressed && this.position.x<400){

  }

i wrote like this but same error happen again

4

that looks correct, make sure you have all the spaces in the right place (tests can be finnicky), and you don’t have syntax errors (check the console)

5

every thing is on right place but i don’t how the same error happen again. even i reset the lesson also

6

try adding a space here between the two brackets

7

added but error not resolved yet!! :smiling_face_with_tear:

8

please post your code again

9 

const animate = () => {
  requestAnimationFrame(animate);
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  player.update();
  if( keys.rightKey.pressed && this.position.x < 400 ) {

  }
}
10

not this, use player

11

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