62 lines
2.0 KiB
C#
62 lines
2.0 KiB
C#
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using UnityEngine;
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using UnityEngine.UI;
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namespace BulletHellTemplate
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{
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/// <summary>
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/// Scrolls a texture on a RawImage by modifying its UV rect, creating an infinite scrolling effect.
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/// Automatically resets UV values to prevent floating-point precision errors over long periods.
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/// </summary>
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[RequireComponent(typeof(RawImage))]
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public class RawImageScroller : MonoBehaviour
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{
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[Header("Scroll Speed")]
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[Tooltip("Horizontal scroll speed (units per second). Positive = scroll right, Negative = scroll left.")]
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public float scrollSpeedX = 0.1f;
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[Tooltip("Vertical scroll speed (units per second). Positive = scroll up, Negative = scroll down.")]
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public float scrollSpeedY = 0.0f;
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[Header("UV Reset Settings")]
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[Tooltip("Threshold at which the UV coordinates will be reset to prevent precision loss.")]
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public float uvResetThreshold = 100.0f;
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private RawImage rawImage;
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private Rect currentUVRect;
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/// <summary>
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/// Caches the RawImage component and initial UV rect.
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/// </summary>
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private void Awake()
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{
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rawImage = GetComponent<RawImage>();
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currentUVRect = rawImage.uvRect;
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}
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/// <summary>
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/// Updates the UV rect every frame to produce a seamless scrolling effect.
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/// </summary>
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private void Update()
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{
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float offsetX = scrollSpeedX * Time.deltaTime;
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float offsetY = scrollSpeedY * Time.deltaTime;
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currentUVRect.x += offsetX;
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currentUVRect.y += offsetY;
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// Reset UV coordinates if they exceed the threshold
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if (Mathf.Abs(currentUVRect.x) > uvResetThreshold)
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{
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currentUVRect.x = Mathf.Repeat(currentUVRect.x, 1.0f);
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}
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if (Mathf.Abs(currentUVRect.y) > uvResetThreshold)
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{
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currentUVRect.y = Mathf.Repeat(currentUVRect.y, 1.0f);
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}
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rawImage.uvRect = currentUVRect;
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}
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}
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}
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