collision dectection

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Taylor Ith

*/

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let player = Player();

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let ninjastar;

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let collisionRadius = 50;

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// global variable to contain image data

//accessed by preload and draw

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let charIdleSprite, charWalkSprite, char2HealthSprite;

let ninjastar1move;

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let backgroundMusic;

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function preload() {

  charIdleSprite = loadImage("Sprite/character_Idle.gif");

  charWalkSprite = loadImage("Sprite/character_walk.gif");

  char2HealthSprite = loadImage("Sprite/sprite_2hp.gif");

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  ninjastar1move = loadImage("Sprite/NinjaStar2x0.gif");

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  backgroundMusic = loadSound(

    "audio/oga_japanese_hacks-[AudioTrimmer.com].mp3"

  );

}

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function setup() {

  createCanvas(400, 400);

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  imageMode(CENTER);

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  ninjastar = Ninjastar();

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  backgroundMusic.play();

  backgroundMusic.loop(true);

}

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function draw() {

  background(220);

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  player.move();

  player.display();

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  ninjastar.move();

  ninjastar.display();

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  let ninjacollide = detectCollision(player, ninjastar);

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  if (ninjacollide) {

    player.hit();

  }

}

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function Player() {

  let x = 200;

  let y = 200;

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  let animationState = 0;

  // 1 = move

  // 0 = idle

  // 2 = 2hp

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  function move() {

    if (animationState != 2) {

      animationState = 0;

    }

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    if (keyIsDown(RIGHT_ARROW)) {

      x = x + 5;

      animationState = 1; //walk animation

    }

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    if (keyIsDown(LEFT_ARROW)) {

      x = x - 5;

      animationState = 1; //walk animation

    }

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    if (keyIsDown(UP_ARROW)) {

      y = y - 5;

      animationState = 1;

    }

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    if (keyIsDown(DOWN_ARROW)) {

      y = y + 5;

      animationState = 1;

    }

  }

​

  function display() {

    if (animationState == 0) {

      image(charIdleSprite, x, y);

    } else if (animationState == 1) {

      image(charWalkSprite, x, y);

    } else if (animationState == 2) {

      image(char2HealthSprite, x, y);

    }

  }

  function getPosition() {

    return { x, y };

  }

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  function hit() {

    animationState = 2;

  }

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  return { move, display, getPosition, hit };

}

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function Ninjastar() {

  let x = random(0, 500);

  let y = random(0, 500);

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  let animationState = 0;

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  function move() {

    x = x + 7;

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    if (x > width) {

      x = 0;

    }

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    y = y + 5;

    if (y > width) {

      y = 0;

    }

  }

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  function display() {

    if (animationState == 0) {

      image(ninjastar1move, x, y);

    }

  }

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  function getPosition() {

    return { x, y };

  }

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  return { move, display, getPosition };

}

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//compare the position of two objects

// return true if they are colliding

function detectCollision(objA, objB) {

  let aPosition = objA.getPosition();

  let bPosition = objB.getPosition();

​

  let d = dist(aPosition.x, aPosition.y, bPosition.x, bPosition.y);

  let isColliding = d < collisionRadius;

  return isColliding; // returns true or false

}

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function mousePressed() {}

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