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Invaders.js
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Invaders.js
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class Invaders {
constructor(alienImage, rowsCount) {
this.alienImage = alienImage;
this.rowsCount = rowsCount;
this.direction = 0;
this.y = 40;
this.aliens = this.initialiseAliens();
this.bullets = [];
this.movingDown = true;
this.speed = 0.2;
this.timeSinceLastBullet = 0;
}
update(player) {
for (let alien of this.aliens) {
if (this.direction == 0) {
alien.x+= this.speed;
} else if (this.direction == 1) {
alien.x-= this.speed;
}
if (alien.hasHitPlayer(player)){
player.loseLife();
}
}
if (this.hasChangedDirection()) {
this.moveAlienDown();
}
if (this.aliens.length == 0) {
this.nextLevel();
}
if (this.timeSinceLastBullet >= 40) {
let bottomAliens = this.getBottomAliens();
if (bottomAliens.length) {
this.makeABottomAlienShoot(bottomAliens);
}
}
this.timeSinceLastBullet++;
this.updateBullets(player);
}
hasChangedDirection() {
for (let alien of this.aliens) {
if (alien.x >= width - 40) {
this.direction = 1;
return true;
} else if (alien.x <= 20) {
this.direction = 0;
return true;
}
}
return false;
}
moveAlienDown() {
for (let alien of this.aliens) {
if(this.movingDown){
alien.y += 10;
if(alien.y >= height -30){
this.movingDown = false;
}
} else {
alien.y -= 10;
if(alien.y <= 0){
this.movingDown = true;
}
}
}
}
getBottomAliens() {
let allXPositions = this.getAllXPositions();
let aliensAtTheBottom = [];
for (let alienAtX of allXPositions) {
let bestYPosition = 0;
let lowestAlien;
for (let alien of this.aliens) {
if (alien.x == alienAtX) {
if (alien.y > bestYPosition) {
bestYPosition = alien.y;
lowestAlien = alien;
}
}
}
aliensAtTheBottom.push(lowestAlien);
}
return aliensAtTheBottom;
}
getAllXPositions() {
let allXPositions = new Set();
for (let alien of this.aliens) {
allXPositions.add(alien.x);
}
return allXPositions
}
nextLevel() {
this.speed += 0.2;
this.aliens = this.initialiseAliens();
}
initialiseAliens() {
let aliens = [];
let y = 40;
for (let i = 0; i < this.rowsCount; i++) {
for (let x = 40; x < width - 40; x += 30) {
aliens.push(new Alien(x, y, this.alienImage));
}
y += 40;
}
return aliens;
}
draw() {
for (let bullet of this.bullets) {
fill('#f30000')
rect(bullet.x, bullet.y, 4, 10);
}
for (let alien of this.aliens) {
alien.draw();
}
}
checkCollision(x, y) {
for (let i = this.aliens.length - 1; i >= 0; i--) {
let currentAlien = this.aliens[i];
if (dist(x, y, currentAlien.x + 11.5, currentAlien.y + 8) < 10) {
this.aliens.splice(i, 1);
return true;
}
}
return false;
}
makeABottomAlienShoot(bottomAliens) {
let shootingAlien = random(bottomAliens);
let bullet = new AlienBullet(shootingAlien.x + 10, shootingAlien.y + 10);
this.bullets.push(bullet);
this.timeSinceLastBullet = 0;
}
updateBullets(player) {
for (let i = this.bullets.length - 1; i >= 0; i-- ) {
this.bullets[i].y += 2;
if(this.bullets[i].hasHitPlayer(player)){
player.loseLife();
}
}
}
}