import Phaser from "phaser";

export default class Beam extends Phaser.Physics.Arcade.Sprite {

static SPEED = 100;

static DURATION = 1000;

constructor(scene, player) {

const x = player.x;

const y = player.y - 16;

super(scene, x, y, "beam");

this.scale = 0.2;

scene.add.existing(this);

scene.physics.world.enableBody(this);

scene.m_projectiles.add(this);

scene.m_beamSound.play();

this.setCircle(30);

this.setDepth(80);

this.setVelocity();

this.setAngle();

// DURATION만큼 시간이 지나면 사라짐

scene.time.addEvent({

delay: Beam.DURATION,

callback: () => {

this.destroy();

},

loop: false,

});

}

// beam이 가장 가까운 mob으로 날아가도록 속도를 설정해주는 함수

setVelocity() {

if (!this.scene.m_closest) {

this.setVelocityY(-250);

return;

}

const _x = this.scene.m_closest.x - this.x;

const _y = this.scene.m_closest.y - this.y;

const _r = Math.sqrt(_x * _x + _y * _y) / 2;

this.body.velocity.x = (_x / _r) * Beam.SPEED;

this.body.velocity.y = (_y / _r) * Beam.SPEED;

}

// beam이 mob에 날아갈 때 각도를 설정해주는 함수

setAngle() {

const angleToMob = Phaser.Math.Angle.Between(

this.x,

this.y,

this.scene.m_closest.x,

this.scene.m_closest.y

);

this.rotation = angleToMob + Math.PI / 2;

this.body.setAngularVelocity(0);

}

}