49 lines
1.7 KiB
C#
49 lines
1.7 KiB
C#
|
using System.Collections;
|
||
|
|
using System.Collections.Generic;
|
||
|
|
using UnityEngine;
|
||
|
|
|
||
|
|
public class Enemy_2 : Enemy
|
||
|
|
{
|
||
|
|
[Header("Set in Inspector: Enemy_2")]
|
||
|
|
// Determines how much the Sine wave will affect movement
|
||
|
|
public float sinEccentricity = 0.6f;
|
||
|
|
public float lifeTime = 10;
|
||
|
|
[Header("Set Dynamically: Enemy_2")]
|
||
|
|
// Enemy_2 uses a Sin wave to modify a 2-point linear interpolation
|
||
|
|
public Vector3 p0;
|
||
|
|
public Vector3 p1;
|
||
|
|
public float birthTime;
|
||
|
|
void Start() {
|
||
|
|
// Pick any point on the left side of the screen
|
||
|
|
p0 = Vector3.zero;
|
||
|
|
p0.x = -bndCheck.camWidth - bndCheck.radius;
|
||
|
|
p0.y = Random.Range(-bndCheck.camHeight, bndCheck.camHeight);
|
||
|
|
// Pick any point on the right side of the screen
|
||
|
|
p1 = Vector3.zero;
|
||
|
|
p1.x = bndCheck.camWidth + bndCheck.radius;
|
||
|
|
p1.y = Random.Range(-bndCheck.camHeight, bndCheck.camHeight);
|
||
|
|
// Possibly swap sides
|
||
|
|
if (Random.value > 0.5f) {
|
||
|
|
// Setting the .x of each point to its negative will move it to
|
||
|
|
// the other side of the screen
|
||
|
|
p0.x *= -1;
|
||
|
|
p1.x *= -1;
|
||
|
|
}
|
||
|
|
// Set the birthTime to the current time
|
||
|
|
birthTime = Time.time;
|
||
|
|
}
|
||
|
|
public override void Move() {
|
||
|
|
// Bezier curves work based on a u value between 0 & 1
|
||
|
|
float u = (Time.time - birthTime) / lifeTime;
|
||
|
|
// If u>1, then it has been longer than lifeTime since birthTime
|
||
|
|
if (u > 1) {
|
||
|
|
// This Enemy_2 has finished its life
|
||
|
|
Destroy(this.gameObject);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
// Adjust u by adding a U Curve based on a Sine wave
|
||
|
|
u = u + sinEccentricity*(Mathf.Sin(u*Mathf.PI*2));
|
||
|
|
pos = (1-u)*p0 + u*p1;
|
||
|
|
}
|
||
|
|
}
|