An easy to use Unity 3D library for creating illustrated Interactive Fiction games and more.
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using UnityEngine;
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using System.Collections;
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namespace Fungus
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{
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/**
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* Attach this component to a sprite object to apply a simple parallax scrolling effect.
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* The parallax offset is calculated based on the distance from the camera to the position of the parent Room.
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*/
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public class Parallax : MonoBehaviour
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{
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/**
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* Scale factor for calculating the parallax offset.
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*/
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public Vector2 parallaxScale = new Vector2(0.25f, 0f);
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Vector3 startPosition;
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Room parentRoom;
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void Start ()
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{
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// Store the starting position of the sprite object
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startPosition = transform.position;
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// Store a reference to the parent Room object
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Transform ancestor = transform.parent;
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while (ancestor != null)
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{
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Room room = ancestor.GetComponent<Room>();
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if (room != null)
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{
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parentRoom = room;
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break;
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}
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ancestor = ancestor.transform.parent;
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}
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}
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void Update ()
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{
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if (parentRoom == null)
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{
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// Don't apply offset if the sprite is not a child of a Room
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return;
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}
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if (Game.GetInstance().activeRoom != parentRoom)
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{
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// Early out if this sprite is not in the currently active Room
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return;
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}
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Vector3 offset = Game.GetInstance().GetParallaxOffset(parallaxScale);
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// Set new position for sprite
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transform.position = startPosition + offset;
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}
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}
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}
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