51 lines
1.8 KiB
C#
51 lines
1.8 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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public class Enemy_3 : Enemy
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{
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// Enemy_3 will move following a Bezier curve, which is a linear
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// interpolation between more than two points.
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[Header("Set in Inspector: Enemy_3")]
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public float lifeTime = 5;
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[Header("Set Dynamically: Enemy_3")]
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public Vector3[] points;
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public float birthTime;
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// Again, Start works well because its not used by the Enemy superclass
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void Start() {
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points = new Vector3[3]; // Initialize points
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// The start position has already been set by Main.SpawnEnemy()
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points[0] = pos;
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// Set xMin and xMax that same way that Main.SpawnEnemy() does
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float xMin = -bndCheck.camWidth + bndCheck.radius;
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float xMax = bndCheck.camWidth - bndCheck.radius;
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Vector3 v = Vector3.zero;
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// Pick a random middle position in the bottom half of the screen;
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v.x = Random.Range(xMin, xMax);
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v.y = -bndCheck.camHeight * Random.Range(2.75f, 2);
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points[1] = v;
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// Pick a random final position above the top of the screen
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v = Vector3.zero;
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v.y = pos.y;
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v.x = Random.Range(xMin, xMax);
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points[2] = v;
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// Set the birthTime to the current time
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birthTime = Time.time;
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}
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public override void Move() {
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// Bezier curves work based on a u value between 0 & 1
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float u = (Time.time - birthTime) / lifeTime;
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if (u > 1) {
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// This Enemy_3 has finished its life
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Destroy(this.gameObject);
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return;
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}
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// Interpolate the three Bezier cruve points
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Vector3 p01, p12;
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u = u - 0.2f*Mathf.Sin(u * Mathf.PI * 2);
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p01 = (1-u)*points[0] + u*points[1];
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p12 = (1-u)*points[1] + u*points[2];
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pos = (1-u)*p01 + u*p12;
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}
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}
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