followTarget

Permet à un objet de suivre un autre objet

How to use

requiresight()

parameters

Parameter	Default Value	Type	Description
speed		number	280
stopDistance		number	0
retreat		boolean	false
tag		string	"player"
uTurnDelay		number	0.2
loosingSight		number	400
jumpForce		number	800
jumping		boolean	true
sight		number	180

example

followTarget({
  speed: 280,
  stopDistance: 0,
  retreat: false,
  tag: "player",
  uTurnDelay: 0.2,
  loosingSight: 400,
  jumpForce: 800,
  jumping: true,
  sight: 180
}),

Source

component.js

function followTarget(p) {
  const param = {
    speed: 280,
    stopDistance: 0,
    retreat: false,
    tag: "player",
    uTurnDelay: 0.2,
    loosingSight: 400,
    jumpForce: 800,
    jumping: true,
    sight: 180,
    ...p
  }
  return {
    id: "followTarget",
    require: ["sight"],
    add() {
      let retreatPos
      let direction = vec2(0, 0)
      let target
      requestAnimationFrame(() => retreatPos = vec2(this.pos))
      this.on("respawn", () => target = null)
      onUpdate(() => {
        const isOnSight = target != null && target.pos.dist(this.pos) < param.loosingSight
        const gravity = this.gravityScale != 0
        if (!isOnSight) target = this.getClosestTarget(param)
        if (target) {
          const d = this.pos.dist(target.pos)
          let t
          if (d > param.stopDistance) t = target.pos.sub(this.pos)
          else t = vec2(0, 0)
          if (gravity && param.jumping && t.y < -1 && this.isGrounded()) this.jump(param.jumpForce)
          else if (param.retreat) {
            const d = this.pos.dist(retreatPos)
            if (d > param.stopDistance) t = retreatPos.sub(this.pos)
            else t = vec2(0, 0)
          }
          if (gravity) t.y = 0
          tween(direction, t.unit(), param.uTurnDelay, (v) => (direction = v), easings.easeOutSin)
          this.trigger("facing", this.direction)
          this.move(direction.scale(param.speed))
          if (direction.len() > 0.1) this.trigger("facing", direction.unit())
        }
      })
    },
  }
}