63 lines
2.2 KiB
C#
63 lines
2.2 KiB
C#
using UnityEngine;
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/// <summary>
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/// gameplay 世界空间背景(SpriteRenderer，如 bg_replace)自适应覆盖。
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/// 该背景由透视相机渲染、带旋转/缩放，尺寸按 16:9 设计。超宽屏(21:9/32:9)下相机
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/// 水平视野扩大会看到背景边缘之外的黑边，故按屏幕宽高比等比放大其 localScale 使其覆盖。
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///
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/// 仅调整 localScale(表现层)，不改旋转/位置/材质/引用，不影响业务逻辑与动画。
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/// 16:9 屏下缩放系数=1，与原设计逐像素一致。由 UIResolutionAutoFitter 自动附加。
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///
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/// 满足三要求：1) 不改业务逻辑/引用；2) 16:9 缩放=1、不动旋转位置；3) 超宽屏铺满。
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/// </summary>
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[RequireComponent(typeof(SpriteRenderer))]
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[DisallowMultipleComponent]
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public sealed class UISpriteBackgroundCover : MonoBehaviour
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{
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private const float DesignAspect = 16f / 9f;
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private Transform tf;
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private Vector3 baseScale; // 初始设计缩放(16:9 基准)，永不变
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private bool baseCaptured;
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private int lastW = -1, lastH = -1;
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private void OnEnable()
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{
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tf = transform;
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CaptureBaseScale();
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Apply();
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}
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private void CaptureBaseScale()
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{
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if (baseCaptured) return;
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baseScale = tf.localScale;
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baseCaptured = true;
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}
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private void LateUpdate()
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{
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if (Screen.width != lastW || Screen.height != lastH)
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{
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Apply();
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}
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}
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private void Apply()
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{
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if (!baseCaptured) CaptureBaseScale();
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lastW = Screen.width;
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lastH = Screen.height;
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float aspect = (float)Screen.width / Mathf.Max(1, Screen.height);
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// 更宽的屏：水平视野变宽，需按 aspect/DesignAspect 放大以覆盖两侧。
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// 更窄的屏：垂直视野相对更高，需按 DesignAspect/aspect 放大以覆盖上下。
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// 取二者较大值(cover)，保证任一方向都不露黑边。16:9 时系数=1。
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float widthFactor = aspect > DesignAspect ? aspect / DesignAspect : 1f;
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float heightFactor = aspect < DesignAspect ? DesignAspect / aspect : 1f;
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float factor = Mathf.Max(widthFactor, heightFactor);
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tf.localScale = baseScale * factor;
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}
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}
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