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grid.js
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grid.js
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import {Invader} from "./invader.js"
import {canvas} from "./index.js"
import {c} from "./index.js"
export class Grid {
constructor() {
this.position = {
x: 0,
y: 0
}
this.velocity = {
x: 3,
y: 0
}
this.invaders = []
const columns = Math.random() * 10 + 5
const rows = Math.random() * 5 + 2
this.width = columns * 30
this.loaded = false
const image = new Image()
image.src = './assets/invaders.png'
image.onload = () => {
for (let x = 0; x < columns; x++) {
for (let y = 0; y < rows; y++) {
const type = Math.floor(Math.randomInterval(0, 5))
this.invaders.push(new Invader({
position: {
x: x * image.width * Invader.scale * Invader.aspect + 15 * x,
y: y * image.height / 6 * Invader.scale + 5
},
type: type
}))
}
}
this.loaded = true
}
this.collided = false
}
update() {
this.position.x += this.velocity.x
this.position.y += this.velocity.y
this.velocity.y = 0
if (this.position.x + this.width >= canvas.width || this.position.x <= 0) {
this.velocity.x = - this.velocity.x
this.velocity.y += 30
}
this.invaders.forEach( (invader) => {
invader.update({
velocity: this.velocity
})
})
}
clean() {
this.invaders.forEach((invader, index) => {
if (invader.collided)
this.invaders.splice(index, 1)
})
this.collided = !this.invaders.length && this.loaded
}
}