78 lines
2.3 KiB
C#
78 lines
2.3 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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/// <summary>
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/// Weiva Parallax
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/// 2D 视差效果
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/// 本组件背景视差效果是根据背景对象的世界坐标z值来计算。默认参数中的背景数组第一个元素为最远平面，
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/// 既与摄像机同步的平面，该对象之间的背景根据z值进行视差计算。也可以单独设置参数 synZ 强制设置最
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/// 远平面。大于最远平面的 z 值将会反超摄像机移动。
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/// weivain@qq.com
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/// www.weiva.com
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/// </summary>
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public class WVParallax : MonoBehaviour {
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[Header("背景图片对象，Element 0 为与摄像机同步的背景层")]
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public Transform[] backgrounds;
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// 主摄像机
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private Transform cam;
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// 上一帧摄像机的位置
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private Vector3 previousCamPos;
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// 摄像机同步背景层的 z 值
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[Header("摄像机同步背景层Z值，若0为背景层0")]
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public float synZ=0f;
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[Header("偏移x系数")]
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public float parallaxScaleX=1f;
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[Header("偏移y系数")]
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public float parallaxScaleY=1f;
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public bool canParallax = true;
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// 初始化
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void Start ()
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{
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cam = Camera.main.transform;
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// 上一帧摄像机的位置
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previousCamPos = cam.position;
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if(synZ == 0 && null != backgrounds[0])
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{
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synZ = backgrounds[0].position.z;
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}
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if(synZ == 0)
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{
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synZ = 100f;
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}
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}
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// 每一帧执行
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void Update ()
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{
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if (canParallax)
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{
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// 获得摄像机和上一帧的偏移值
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float parallax = previousCamPos.x - cam.position.x;
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//摄像机偏移矢量
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Vector3 camMove = cam.position - previousCamPos;
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camMove.x *= parallaxScaleX;
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camMove.y *= parallaxScaleY;
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//同步背景
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for (int i = 0; i < backgrounds.Length; i++)
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{
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if (null == backgrounds[i]) continue;
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Vector3 targetToMove = backgrounds[i].position + camMove * (backgrounds[i].position.z / synZ);
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backgrounds[i].position = targetToMove;
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}
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// 更新上一帧摄像机的位置
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previousCamPos = cam.position;
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}
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}
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}
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