Popcorn Hacks:

Develop a basic combat system that allows characters to engage in battles with enemies. This will help you practice using functions, conditionals, and basic game mechanics in JavaScript.

Popcorn Hack Part 1 - 1: Using initializeData Function
  1. Add speed to the initializeData(data = null) function and give it a default value.
  2. Add seed to the HTML output.
  3. Add speed to the JSON data.
  4. Test calling initializeData with no argument, and then using a data JSON object as an argument.
Popcorn Hack Part 1 - 2: Adding IJKL Key Conditions in handleKeyDown
  1. Add a case statement for each of the IJKL keys in the handleKeyDown({ keyCode }) switch statement.
  2. Send the key code for each IJKL key to the gameObject.handleKeyDown method.
  3. Use console.log() to output gameObject.
Popcorn Hack 2: Creating a Simple Attack System
  1. Add a boolean variable named canAttack, and set it to false.
  2. Use an if statement to check if the player can attack.
  3. If canAttack is false, output “Can’t attack.”
  4. Use Math.random() to determine if the player is allowed to attack. (Tip: Use ChatGPT for help with Math.random() if needed!)
  5. This will pick a random number to decide if the attack can happen.
  6. Use console.log() for all outputs.
Popcorn Hack 3: Level Requirement Check
  1. Use the ternary operator to create an output if the player meets the level requirements.
  2. If not, output a message telling the player they are under-leveled.
  3. Use console.log() to print your output.
%%html

<output id="output"></output>

<script>
function intializeData(data = null) {
    // Define default values
    let scaleFactor = 9/16;
    let animationRate = 1;
    let position = [0, 0];
    let speed = 2;

    // Check if data is provided
    if (data) {
        scaleFactor = data.SCALE_FACTOR || scaleFactor;
        animationRate = data.ANIMATION_RATE || animationRate;
        position = data.INIT_POSITION || position;
        speed = data.SPEED || speed;
    }

    document.getElementById("output").innerHTML = `
        <p>Scale Factor: ${scaleFactor}</p>
        <p>Animation Rate: ${animationRate}</p>
        <p>Initial Position: ${position}</p>
        <p>Speed: ${speed}</p>
    `;
}

var data = {
    SCALE_FACTOR: 1/1,
    ANIMATION_RATE: 25,
    INIT_POSITION: [100, 100],
    SPEED: 10,
}

// Uncomment one of the following lines to test the if statement in the function
//intializeData();
intializeData(data);

</script>



%%javascript

class GameObject {
    constructor() {
        this.velocity = { x: 0, y: 0 };
        this.direction = '';
        this.xVelocity = 1;
        this.yVelocity = 1;
    }

    handleKeyDown({ keyCode }) {
        switch (keyCode) {
            case 1: // I key
                this.direction = 'up';
                break;
            case 2: // J key
                this.direction = 'left';
                break;
            case 3: // K key
                this.direction = 'down';
                break;
            case 4: // L key
                this.direction = 'right';
                break;
        }
    }
}

const gameObject = new GameObject();
console.log('Initial State:', gameObject);

gameObject.handleKeyDown({ keyCode: 1 }); // Simulate I key press
console.log('After I Key Press:', gameObject);

gameObject.handleKeyDown({ keyCode: 2 }); // Simulate J key press
console.log('After J Key Press:', gameObject);

gameObject.handleKeyDown({ keyCode: 3 }); // Simulate K key press
console.log('After K Key Press:', gameObject);

gameObject.handleKeyDown({ keyCode: 4 }); // Simulate L key press
console.log('After L Key Press:', gameObject);

<IPython.core.display.Javascript object>

%%js

let canAttack = Math.random();

if (canAttack < 0.5) {
    console.log("Can't attack")
} else {
    console.log("Can attack")
}

<IPython.core.display.Javascript object>

%%html

<div id="output2"></div>

<script>
    function code(){
        let level = 10;
        let output = document.getElementById("output2");
        let message = (level === 10) ? "Level requirements are met" : "Not high enough level";
        output.innerHTML = message;
        console.log(message)
    }
code()
    </script>

Homework:

Objectives


Option 1: Create a simple combat system.

  • Allow characters to fight enemies.
  • Use basic functions and conditionals in JavaScript.
  • Focus on making it easy to understand how battles work.


Option 2: Make a dialogue system for your NPC (Non-Player Character).

  • Use the prompt() function to ask the player for a response (choose a number from 1 to 4).
  • This dialogue should appear when the player gets close to the NPC and presses a button.

</span>

Additional Tips:

  • For Option 1:
    • Start by writing down what the characters and enemies will be. Create simple names and attributes (like health).
    • Use console.log() to print out what's happening at each step. This will help you understand the flow of your code.
    • Look for example code online to see how others have created combat systems. Don't be afraid to borrow ideas!
  • For Option 2:
    • Plan out the dialogue options before you start coding. Write them down in a list.
    • Use comments in your code to remind yourself what each part does. For example, // Ask the player for a response.
    • Test your code frequently. After writing a few lines, run it to see if it works before adding more.
%%js

//prompt
console.log("Choose a number from 1 to 4.")

let response = 10;

switch(response){
    case 1:
        console.log("You chose the number 1. Have a great day.")
        break;
    case 2:
        console.log("You chose the number 2. It's a nice number.")
        break;
    case 3:
        console.log("You chose the number 3. No comment.")
        break;
    case 4:
        console.log("You chose the number 4. That's it.")
        break;
}

if (response > 4) {
    console.log("Please choose a number from 1 to 4.")
}

<IPython.core.display.Javascript object>

%%js