buch415.js

// https://buch415.github.io/game-off-2016/
// 648
setup: function () {
  this.canonPosition = 48;
  this.maxEnemyPosition = 790;
  this.maxShootPosition = 700;
  this.minShootPosition = 400;
  this.currentEnemy = null;
  this.enemies = [];
  
  /*
  this.setCannonAngle(cannonMinAngle);
  
  var angle = cannonMinAngle;
  while (angle < cannonMaxAngle) {
  	console.log(angle, this.calcShootDistance(angle));
    angle += 0.01;
  }
  */
},
  
calcShootDistance: function (angle) {
  angle = angle || this.getCannonAngle();
  var distance = (Math.pow(cannonShootSpeed, 2) * Math.sin(2 * angle)) / g;
  distance += this.canonPosition;
  return distance;
},
 
calcShootAngle: function (R) {
  R = R - this.canonPosition;
  return Math.asin( (R*g) / (Math.pow(cannonShootSpeed, 2) * 2) );
},
  
updateEnemies: function () {
  this.enemies.forEach(enemy => enemy.killed = true);
  
  this.getEnemies().forEach((e, enemyIndex) => {
    var found = false;
    this.enemies.forEach(enemy => {
      if (Math.abs(e[0] - enemy.x) < 5) {
        found = true;
        enemy.index = enemyIndex;
        enemy.x = e[0];
        enemy.killed = false;
      }
    }, this);
    if (!found) {
      console.log('New enemy!');
      this.enemies.push({
        index: enemyIndex,
        x: e[0],
        y: e[1]
      });
    }
  }, this);
  
  
  this.enemies.forEach((enemy, index) => {
    if (enemy.killed) {
      console.log('Enemy killed!');
      this.enemies.splice(index, 1);
    }
  }, this);
},
  
update: function () {
  this.updateEnemies();
  
  //if (this.hp() < 8 && this.ready()) {
  //  this.repair();
  //}
  
  if (this.enemies.length == 0) {
    return;
  }
  
  var enemies = this.enemies.filter(e => !e.shot);
  if (enemies.length == 0) {
    return;
  }
  
  this.currentEnemy = enemies[0];
  this.nextEnemy = enemies.length >= 2 ? enemies[1] : null
  
  if (this.currentEnemy.x < this.minShootPosition) {
    return;
  }
  
  if (!this.currentEnemy.marked) {
    console.log('Mark!', this.currentEnemy.index);
    this.mark(this.currentEnemy.index);
    this.currentEnemy.marked = true;
  }
   
  var bulletDelay = this.currentEnemy.x / 10;

  if ((this.calcShootDistance() - this.currentEnemy.x + bulletDelay) < 1) {
    if (this.ready() && this.currentEnemy.x < this.maxShootPosition) {
      console.log('Shoot: ', this.calcShootDistance(), this.currentEnemy.x);
      this.shoot();
      this.currentEnemy.shot = true;
      if (this.nextEnemy && this.nextEnemy.x - 30 < this.currentEnemy.x) {
        this.nextEnemy.shot = true;
      }
      return;
    }
  }
  
  this.setCannonAngle(this.calcShootAngle(this.currentEnemy.x - bulletDelay));
}