Top-Down Shooter - OpenProcessing

zombieslocal
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//TODO: Implement states (Gameover, menus, etc.)
//TODO: Implement networking.
//TODO: this.HasHit should be a var (methinks).
//TODO: Use a timer for drops and enemies.
//TODO: Make player zombie when killed (for effect).
//TODO: Add movement acceleration to enemy and player.
​
Array.prototype.remove = function(item) {
  var index = this.indexOf(item);
  if (index !== -1) this.splice(index, 1);
};
​
/**** Global Variables ****/
var myPlayer;
var thePlayers;
var theBullets;
var theEnemies;
var theDrops;
var NORTH = 1;
var EAST = 2;
var SOUTH = 4;
var WEST = 8;
// Not sure if these should be globals, but...
var spawnInterval;
var spawnSpeed;
var spawnModifier;
var dropInterval;
var dropSpeed;
var dropModifier;
var screenFade;
var showDebug;
var gamestate; // 0 = Main menu, 1 = Game, 2 = Gameover
​
function setup() {
  createCanvas(600, 480);
  frameRate(60);
  cursor(CROSS);
​
  initialize();
}
​
function draw() {
  if (gamestate === 1) {
    gameUpdate();
    gameDraw();
  } else if (gamestate === 2) {
    gameUpdate();
    gameDraw();
    gameoverDraw();
  }
​
  if (showDebug) {
    debugDraw();
  }
}
​
function keyPressed() {
  switch (key) {
    // For player direction.
    case "w":
    case "W":
      myPlayer.direction |= NORTH;
      break;
    case "d":
    case "D":
      myPlayer.direction |= EAST;
      break;
    case "s":
    case "S":
      myPlayer.direction |= SOUTH;
      break;
    case "a":
    case "A":
      myPlayer.direction |= WEST;
      break;
    // Restart game if it's over
    case "r":
    case "R":
      if (gamestate === 2) {
        initialize();
      }
      break;
    // Enable showDebug mode.
    case "t":
    case "T":
      if (showDebug) {
        showDebug = false;
      } else {
        showDebug = true;
      }
      break;
    // Enemy Spawning (For Debugging!)
    //case('z'): theEnemies.push(new Enemy());break;
    //case('z'): spawnInterval = 100;break;
  }
}
​
function keyReleased() {
  // For player direction.
  switch (key) {
    case "w":
    case "W":
      myPlayer.direction ^= NORTH;
      break;
    case "d":
    case "D":
      myPlayer.direction ^= EAST;
      break;
    case "s":
    case "S":
      myPlayer.direction ^= SOUTH;
      break;
    case "a":
    case "A":
      myPlayer.direction ^= WEST;
      break;
  }
}
​
function mouseMoved() {
  myPlayer.mouseLoc.x = mouseX;
  myPlayer.mouseLoc.y = mouseY;
}
​
function mouseDragged() {
  myPlayer.mouseLoc.x = mouseX;
  myPlayer.mouseLoc.y = mouseY;
}
​
function mousePressed() {
  myPlayer.weapon.firing = true;
}
​
function mouseReleased() {
  // If the gun is an automatic, enable this.
  // Fixes an issue with fully/semi auto guns.
  if (myPlayer.weapon.type === 1) {
    myPlayer.weapon.firing = false;
  }
}
class Bullet {
  /**** Constructors ****/
  constructor(tempOwner) {
    this.owner = tempOwner;
    this.location = createVector(this.owner.location.x, this.owner.location.y); // Copy it so we don't modify the original owner's location
    this.breadth = 10;
    this.speed = 15.0;
    this.damage = 1;
    this.trajectory = p5.Vector.sub(this.owner.mouseLoc, this.location);
    this.trajectory.normalize();
    this.trajectory.mult(this.speed);
    this.colNorm = color(25, 75, 200);
    this.colCur = this.colNorm;
  }
​
  /**** Methods ****/
  travel() {
    // Bullet is moved avar the this.trajectory
    this.location.add(this.trajectory);
  }
​
  stillAlive() {
    // Delete bullet if it goes off screen.
    // Also, a cheesy Portal reference.
    // http://www.youtube.com/watch?v=8IGS9qY7xko
    // Also, thanks amnon.owned from the Processing forums
    // for the refactored code tip!
    if (
      this.location.y > height ||
      this.location.y < 0 ||
      this.location.x > width ||
      this.location.x < 0
    ) {
      this.destroy();
    }
  }
​
  hasHit() {
    for (var i = 0; i < theEnemies.length; i++) {
      var e = theEnemies[i];
      var distance = dist(
        this.location.x,
        this.location.y,
        e.location.x,
        e.location.y
      );
​
      if (distance < this.breadth / 2 + e.breadth / 2) {
        e.takeDamage(this);
        this.destroy();
        break;
      }
    }
  }
​
  destroy() {
    theBullets.remove(this);
  }
​
  /**** Update and Display ****/
  update() {
    this.travel();
    this.stillAlive();
    this.hasHit();
  }
​
  display() {
    push();
    ellipseMode(CENTER);
    fill(this.colCur);
    ellipse(this.location.x, this.location.y, this.breadth, this.breadth);
    noFill();
    pop();
  }
}
class Drop {
  constructor(i) {
    this.location = createVector(
      Math.floor(random(width)),
      Math.floor(random(height))
    );
    this.breadth = 10;
    this.type = i;
​
    switch (i) {
      // Health pack.
      case 0:
        this.colNorm = color(255, 118, 246);
        break;
      // SMG
      case 1:
        this.colNorm = color(255, 255, 0);
        break;
    }
  }
​
  hasHit() {
    for (var i = 0; i < thePlayers.length; i++) {
      var p = thePlayers[i];
      var distance = dist(
        this.location.x,
        this.location.y,
        p.location.x,
        p.location.y
      );
​
      if (distance < this.breadth / 2 + p.breadth / 2) {
        this.giveEffect(p);
        this.destroy();
        break;
      }
    }
  }
​
  giveEffect(p) {
    switch (this.type) {
      case 0:
        p.heal(3);
        break;
      case 1:
        p.weapon = new SMG(p);
        break;
    }
  }
​
  destroy() {
    theDrops.remove(this);
  }
​
  update() {
    this.hasHit();
  }
​
  display() {
    fill(this.colNorm);
    ellipse(this.location.x, this.location.y, this.breadth, this.breadth);
    noFill();
  }
}
class Enemy {
  /**** Constructors ****/
  constructor() {
    this.location = this.generateSpawn();
    this.target = this.getTarget();
    this.speed = 1;
    this.breadth = 18;
    this.healthMax = 2;
    this.healthCur = this.healthMax;
    this.damage = 1;
    this.hitTimer = new Timer(5);
    this.colNorm = color(125, 75, 100);
    this.colHit = color(255, 0, 0);
    this.colCur = this.colNorm;
  }
​
  /**** Methods ****/
  walk() {
    if (gamestate === 1) {
      // Enemy walks towards player.
      this.trajectory = p5.Vector.sub(this.target.location, this.location);
      this.trajectory.normalize();
      this.trajectory.mult(this.speed);
    }
    this.location.add(this.trajectory);
  }
​
  hasHit() {
    for (var i = 0; i < thePlayers.length; i++) {
      var p = thePlayers[i];
​
      if (p.alive === true) {
        var distance = dist(
          this.location.x,
          this.location.y,
          p.location.x,
          p.location.y
        );
​
        // If there is a collision...
        if (distance < this.breadth / 2 + p.breadth / 2) {
          p.takeDamage(this);
          this.destroy();
          break;
        }
      }
    }
  }
​
  takeDamage(b) {
    this.healthCur -= b.damage;
    if (this.healthCur <= 0) {
      this.destroy();
      b.owner.score++;
    } else {
      // Flash colors
      this.colCur = this.colHit;
      this.hitTimer.start();
    }
  }
​
  colChange() {
    if (this.colCur === this.colHit && this.hitTimer.isFinished()) {
      this.colCur = this.colNorm;
    }
  }
​
  destroy() {
    theEnemies.remove(this);
  }
​
  shamble() {
    this.speed = random(0.3, 0.6);
    this.trajectory.set([random(-50, 50), random(-50, 50), 0]);
    this.trajectory.normalize();
    this.trajectory.mult(this.speed);
  }
​
  generateSpawn() {
    var side;
    var spawnX = 0;
    var spawnY = 0;
​
    side = Math.floor(random(4));
    switch (side) {
      case 0:
        spawnX = Math.floor(random(width));
        spawnY = 0;
        break;
      case 1:
        spawnX = width;
        spawnY = Math.floor(random(height));
        break;
      case 2:
        spawnX = Math.floor(random(width));
        spawnY = height;
        break;
      case 3:
        spawnX = 0;
        spawnY = Math.floor(random(height));
        break;
    }
​
    return createVector(spawnX, spawnY);
  }
​
  getTarget() {
    var targetId;
​
    targetId = Math.floor(random(thePlayers.length));
​
    return thePlayers[targetId];
  }
​
  /**** Update and Display ****/
  update() {
    this.walk();
    this.hasHit();
    this.colChange();
  }
​
  display() {
    // Draw the enemy.
    push();
    ellipseMode(CENTER);
    fill(this.colCur);
    ellipse(this.location.x, this.location.y, this.breadth, this.breadth);
    pop();
​
    // Show health as number
    fill(this.colNorm);
    textAlign(CENTER);
    text(this.healthCur, this.location.x, this.location.y - 25);
​
    // Health Bar!
    push();
    stroke(0);
    strokeWeight(1);
    fill(255, 0, 0);
    rect(this.location.x - 25, this.location.y - 20, 50, 5);
    stroke(0, 255);
    fill(0, 255, 0);
    rect(
      this.location.x - 25,
      this.location.y - 20,
      map(this.healthCur, 0, this.healthMax, 0, 50),
      5
    );
    noFill();
    pop();
  }
}
​
/**** Alternate Enemies ****/
​
class FastEnemy extends Enemy {
  /**** Constructors ****/
  constructor() {
    super();
    this.location = this.generateSpawn();
    this.speed = 1.9;
    this.breadth = 18;
    this.healthMax = 1;
    this.healthCur = this.healthMax;
    this.damage = 1;
    this.colNorm = color(25, 255, 25);
    this.colHit = color(255, 0, 0);
    this.colCur = this.colNorm;
  }
}
​
class BossEnemy extends Enemy {
  /**** Constructors ****/
  constructor() {
    super();
    this.location = this.generateSpawn();
    this.speed = 1.8;
    this.breadth = 125;
    this.healthMax = 200;
    this.healthCur = this.healthMax;
    this.damage = 100;
    this.colNorm = color(255, 0, 0);
    this.colHit = color(255, 0, 0);
    this.colCur = this.colNorm;
  }
}
// Sets all globals to their defaults; handy for restarting.
function initialize() {
  background(50);
  showDebug = false;
  gamestate = 1;
  spawnInterval = 0.0;
  spawnSpeed = 30.0;
  spawnModifier = 0.05;
  dropInterval = 0.0;
  dropSpeed = 800.0;
  dropModifier = 1;
  screenFade = 0.0;
  myPlayer = new Player();
  thePlayers = [];
  thePlayers.push(myPlayer);
  theBullets = [];
  theEnemies = [];
  theDrops = [];
}
​
// Creates enemies on an varerval which decreases slowly.
// Should be a static method of "enemy" but Processing
// doesn't like static methods :(
function enemySpawn() {
  if (spawnInterval < spawnSpeed) {
    spawnInterval++;
  } else {
    spawnInterval = 0;
    if (spawnSpeed > 15) {
      spawnSpeed -= spawnModifier;
    } else {
      spawnSpeed = 15;
    }
​
    var enemyType;
    enemyType = Math.floor(random(3));
​
    switch (enemyType) {
      case 0:
        theEnemies.push(new Enemy());
        break;
      default:
        theEnemies.push(new FastEnemy());
        break;
    }
  }
}
​
// Creates drops on an varerval which decreases slowly.
// Should be a static method of "drop" but Processing
// doesn't like static methods :(
function dropSpawn() {
  if (dropInterval < dropSpeed) {
    dropInterval++;
  } else {
    dropInterval = 0;
    if (dropSpeed > 300) {
      dropSpeed -= dropModifier;
    } else {
      dropSpeed = 300;
    }
​
    var dropType;
    dropType = Math.floor(random(3));
​
    switch (dropType) {
      case 0:
        theDrops.push(new Drop(1));
        break;
      default:
        theDrops.push(new Drop(0));
        break;
    }
  }
}
​
function shambleTheZombies() {
  for (var i = 0; i < theEnemies.length; i++) {
    theEnemies[i].shamble();
  }
}
​
// Adds a circle on the cursor, a line from the player to mouse,
// and some debug information at the top-left.
function debugDraw() {
  fill(255);
  textAlign(LEFT);
  text("FPS: " + Number(frameRate()), 5, 40);
  text("Drop Interval: " + dropInterval, 5, 55);
  text("Drop Speed: " + dropSpeed, 5, 70);
  text("Spawn Interval: " + spawnInterval, 5, 85);
  text("Spawn Speed: " + spawnSpeed, 5, 100);
  text("Game State: " + gamestate, 5, 115);
  noFill();
  fill(0);
  /*
  // Draws a line from each enemy to it's this.target.
  for (var i = 0; i < theEnemies.length; i++) {
    Enemy e = theEnemies[i];
    line(e.location.x, e.location.y, e.target.location.x, e.target.location.y);
  }
  */
  noFill();
}
class Gun {
  /**** Constructors ****/
  constructor(tempOwner) {
    this.owner = tempOwner;
    this.firing = false;
    // this.Type: 0 = SemiAuto, 1 = FullyAuto
    this.type = 0;
  }
​
  /**** Methods *****/
  fire() {
    if (this.owner.alive) {
      if (this.firing) {
        theBullets.push(new Bullet(this.owner));
        this.firing = false;
      }
    }
  }
​
  update() {
    this.fire();
  }
}
​
class Pistol extends Gun {
  /**** Constructors ****/
  constructor(tempOwner) {
    super(tempOwner);
  }
}
​
class SMG extends Gun {
  /**** Constructors ****/
  constructor(tempOwner) {
    super(tempOwner);
    this.type = 1;
    this.fireRate = new Timer(115);
    this.fireRate.start();
    this.ammoMax = 100;
    this.ammoCur = this.ammoMax;
  }
​
  /**** Methods *****/
  // This fires the gun like an automatic weapon.
  fire() {
    if (this.owner.alive) {
      if (this.firing && this.fireRate.isFinished() && this.ammoCur > 0) {
        // Fire off a bullet and reduce ammo count.
        theBullets.push(new Bullet(this.owner));
        this.ammoCur--;
​
        // If we have more ammo, restart the this.firing cooldown.
        // Otherwise, give the player back the pistol.
        if (this.ammoCur > 0) {
          this.fireRate.start();
        } else {
          this.owner.weapon = new Pistol(this.owner);
        }
      }
    }
  }
}
// Timer class; currently used for hit flashing.
class Timer {
  constructor(tempTimeLength) {
    this.timeLength = tempTimeLength;
  }
​
  start() {
    this.timeStarted = millis();
  }
​
  isFinished() {
    var timePassed = millis() - this.timeStarted;
​
    if (timePassed >= this.timeLength) {
      return true;
    } else {
      return false;
    }
  }
}
​
class Player {
  /**** Constructors ****/
  constructor() {
    this.location = createVector(width / 2, height / 2);
    this.mouseLoc = createVector(0, 0);
    this.direction = 0;
    this.speed = 2;
    this.breadth = 20;
    this.alive = true;
    this.healthMax = 10;
    this.healthCur = this.healthMax;
    this.score = 0;
    this.weapon = new Pistol(this);
    this.hitTimer = new Timer(25);
    this.colNorm = color(200, 100, 0);
    this.colHit = color(255, 0, 0);
    this.colCur = this.colNorm;
  }
​
  /**** Methods ****/
  walk() {
    switch (this.direction) {
      case NORTH:
        this.location.y -= this.speed;
        break;
      case WEST:
        this.location.x -= this.speed;
        break;
      case SOUTH:
        this.location.y += this.speed;
        break;
      case EAST:
        this.location.x += this.speed;
        break;
      /*
      // Normalized?
      case NORTH|WEST: this.location.y -= this.speed / 2; this.location.x -= this.speed / 2; break;
      case NORTH|EAST: this.location.y -= this.speed / 2; this.location.x += this.speed / 2; break;
      case SOUTH|WEST: this.location.y += this.speed / 2; this.location.x -= this.speed / 2; break;
      case SOUTH|EAST: this.location.y += this.speed / 2; this.location.x += this.speed / 2; break;
      */
      case NORTH | WEST:
        this.location.y -= this.speed;
        this.location.x -= this.speed;
        break;
      case NORTH | EAST:
        this.location.y -= this.speed;
        this.location.x += this.speed;
        break;
      case SOUTH | WEST:
        this.location.y += this.speed;
        this.location.x -= this.speed;
        break;
      case SOUTH | EAST:
        this.location.y += this.speed;
        this.location.x += this.speed;
        break;
      case NORTH | WEST | EAST:
        this.location.y -= this.speed;
        break;
      case SOUTH | WEST | EAST:
        this.location.y += this.speed;
        break;
      case NORTH | WEST | SOUTH:
        this.location.x -= this.speed;
        break;
      case NORTH | SOUTH | EAST:
        this.location.x += this.speed;
        break;
    }
    this.location.x = constrain(
      this.location.x,
      0 + this.breadth / 2,
      width - this.breadth / 2
    );
    this.location.y = constrain(
      this.location.y,
      0 + this.breadth / 2,
      height - this.breadth / 2
    );
  }
​
  takeDamage(e) {
    this.healthCur = constrain(this.healthCur - e.damage, 0, this.healthMax);
    if (this.healthCur <= 0) {
      this.destroy();
    } else {
      // Flash colors
      this.colCur = this.colHit;
      this.hitTimer.start();
    }
  }
​
  heal(healAmt) {
    this.healthCur = constrain(this.healthCur + healAmt, 0, this.healthMax);
  }
​
  colChange() {
    if (this.colCur === this.colHit && this.hitTimer.isFinished()) {
      this.colCur = this.colNorm;
    }
  }
​
  destroy() {
    thePlayers.remove(this);
    this.alive = false;
    gamestate = 2;
​
    for (var i = 0; i < thePlayers.length; i++) {
      var p = thePlayers[i];
​
      if (p.alive === true) {
        gamestate = 1;
      }
    }
​
    if (gamestate === 2) {
      shambleTheZombies();
    } else {
      // If the game is still going, zombies choose a new this.target.
      for (var i = 0; i < theEnemies.length; i++) {
        var e = theEnemies[i];
​
        if (e.target === this) {
          e.target = e.getTarget();
        }
      }
    }
  }
​
  /**** Update and Display ****/
  update() {
    this.walk();
    this.colChange();
    this.weapon.update();
  }
​
  display() {
    // Draw the player.
    fill(this.colCur);
    ellipse(this.location.x, this.location.y, this.breadth, this.breadth);
​
    // This code draws a rotating player - good for the future.
    /*
    push();
    translate(this.location.x, this.location.y);
    rotate(atan2(mouseY-this.location.y, mouseX-this.location.x));
    fill(this.colCur);
    ellipse(0, 0, this.breadth, this.breadth);
    pop();
    */
​
    // Show health as number.
    fill(this.colNorm);
    textAlign(CENTER);
    text(this.healthCur, this.location.x, this.location.y - 25);
​
    // Health Bar!
    push();
    stroke(0);
    strokeWeight(1);
    fill(255, 0, 0);
    rect(this.location.x - 25, this.location.y - 20, 50, 5);
    stroke(0, 255);
    fill(0, 255, 0);
    rect(
      this.location.x - 25,
      this.location.y - 20,
      map(this.healthCur, 0, this.healthMax, 0, 50),
      5
    );
    noFill();
    pop();
​
    // Only show the score for our player at the top.
    if (this === myPlayer) {
      fill(255);
      textAlign(LEFT);
      text("Score: " + this.score, 5, 20);
      noFill();
    }
  }
}
​
function gameUpdate() {
  /**** Miscellaneous ****/
  background(50);
  if (gamestate === 1) {
    enemySpawn();
    dropSpawn();
  }
​
  /**** Updates ****/
  // Player
  for (var i = 0; i < thePlayers.length; i++) {
    thePlayers[i].update();
  }
​
  // Bullets
  for (var i = 0; i < theBullets.length; i++) {
    theBullets[i].update();
  }
​
  // Enemies
  for (var i = 0; i < theEnemies.length; i++) {
    theEnemies[i].update();
  }
​
  // Drops
  for (var i = 0; i < theDrops.length; i++) {
    theDrops[i].update();
  }
}
​
function gameDraw() {
  /**** Displays ****/
  // Player
  for (var i = 0; i < thePlayers.length; i++) {
    thePlayers[i].display();
  }
​
  // Bullets
  for (var i = 0; i < theBullets.length; i++) {
    theBullets[i].display();
  }
​
  // Enemies
  for (var i = 0; i < theEnemies.length; i++) {
    theEnemies[i].display();
  }
​
  // Drops
  for (var i = 0; i < theDrops.length; i++) {
    theDrops[i].display();
  }
}
​
function gameoverDraw() {
  // Draw a big transparent square over the window and
  // slowly make the square become less transparent.
  fill(0, 0, 0, screenFade);
  screenFade = constrain(screenFade + 0.8, 0, 255);
  rect(0, 0, width, height);
  noFill();
  // Write the gameover text.
  textAlign(CENTER);
  textSize(24);
  fill(255, 0, 0);
  text("BRAAAAAAINS!", width / 2, 50);
  textSize(16);
  text("Score: " + myPlayer.score, width / 2, 75);
  textSize(14);
  text("Press R to restart.", width / 2, 100);
  textSize(12);
  noFill();
}
​