shoot

How to use

triggers on self"impact"

parameters

Parameter	Default Value	Type	Description
speed		number	1200
pos		vec2	vec2(0, 0)
lifespan		number	0.01
fadeOut		number	0.4
sprite		string	'bullet'
width		unknown	null
bulletTag		unknown	null
impactTag		string	'*'
dangerParam		object	{}
bounceParam		object	{}
startDistance		number	64
gravityScale		number	0
destroyOnImpact		boolean	true
bounciness		number	0
friction		number	0
aimAngle		number	0

example

shoot({
  speed: 1200,
  pos: vec2(0, 0),
  lifespan: 0.01,
  fadeOut: 0.4,
  sprite: 'bullet',
  width: "null",
  bulletTag: "null",
  impactTag: '*',
  dangerParam: {},
  bounceParam: {},
  startDistance: 64,
  gravityScale: 0,
  destroyOnImpact: true,
  bounciness: 0,
  friction: 0,
  aimAngle: 0
}),

Source

component.js

function shoot(p) {
  const param = {
    speed: 1200,
    pos: vec2(0, 0),
    lifespan: 0.01,
    fadeOut: 0.4,
    sprite: 'bullet',
    width: null,
    bulletTag: null,
    impactTag: '*',
    dangerParam: {},
    bounceParam: {},
    startDistance: 64,
    gravityScale: 0,
    destroyOnImpact: true,
    bounciness: 0,
    friction: 0,
    aimAngle: 0,
    ...p,
  };
  return {
    id: 'shoot',
    add() {
      let aimAngle = param.aimAngle;
      this.on('aiming', (p) => (aimAngle = p));
      this.on('shoot', (p) => {
        const weaponParam = {
          ...param,
          ...p,
        };
        const projectile = add([
          sprite(weaponParam.sprite),
          pos(
            this.pos
              .add(weaponParam.pos)
              .add(Vec2.fromAngle(aimAngle).scale(weaponParam.startDistance))
          ),
          lifespan(weaponParam.lifespan, {
            fade: weaponParam.fadeOut,
          }),
          area({
            collisionIgnore: weaponParam.collisionIgnore,
          }),
          anchor('center'),
          opacity(),
          body({
            gravityScale: weaponParam.gravityScale,
          }),
          rotate(aimAngle),
          danger(param.dangerParam),
          bounce({
            direction: Vec2.fromAngle(aimAngle),
            ...param.bounceParam,
          }),
          'projectile',
        ]);
        if (weaponParam.bulletTag) projectile.tag(weaponParam.bulletTag);
        if (weaponParam.width) projectile.width = weaponParam.width;
        projectile.onCollide(weaponParam.impactTag, () =>
          projectile.trigger('impact')
        );
        projectile.vel = Vec2.fromAngle(aimAngle).scale(weaponParam.speed);
      });
    },
  };
}