52 lines
2.3 KiB
C#
52 lines
2.3 KiB
C#
using UnityEngine;
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using UnityEngine.UI;
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[RequireComponent(typeof(RawImage))]
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public class RawImageAspectFitter : MonoBehaviour {
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public enum FitMode { Contain, Cover }
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public FitMode fitMode = FitMode.Contain; // 选择模式
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private RawImage rawImage;
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private RectTransform rectTransform;
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void Start() {
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rawImage = GetComponent<RawImage>();
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rectTransform = GetComponent<RectTransform>();
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UpdateAspect();
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}
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void UpdateAspect() {
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if (rawImage.texture == null) return;
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// 获取容器和图片的宽高比例
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float containerWidth = rectTransform.rect.width;
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float containerHeight = rectTransform.rect.height;
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float containerRatio = containerWidth / containerHeight;
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float textureRatio = (float)rawImage.texture.width / rawImage.texture.height;
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// 计算缩放比例
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float scaleWidth, scaleHeight;
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if (fitMode == FitMode.Contain) {
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// Contain模式：按比例缩放，完整显示图片
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if (textureRatio > containerRatio) {
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scaleHeight = containerWidth / textureRatio;
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scaleWidth = containerWidth;
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} else {
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scaleWidth = containerHeight * textureRatio;
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scaleHeight = containerHeight;
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}
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// 居中显示，留白
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rawImage.uvRect = new Rect(0, 0, 1, 1);
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rectTransform.sizeDelta = new Vector2(scaleWidth, scaleHeight);
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} else {
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// Cover模式：按比例缩放，裁剪图片填满容器
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if (textureRatio > containerRatio) {
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// 横向裁剪
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float scale = containerHeight / rawImage.texture.height;
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float visibleWidth = rawImage.texture.width * scale;
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float offsetX = (visibleWidth - containerWidth) / (2 * visibleWidth);
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rawImage.uvRect = new Rect(offsetX, 0, containerWidth / visibleWidth, 1);
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} else {
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// 纵向裁剪
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float scale = containerWidth / rawImage.texture.width;
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float visibleHeight = rawImage.texture.height * scale;
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float offsetY = (visibleHeight - containerHeight) / (2 * visibleHeight);
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rawImage.uvRect = new Rect(0, offsetY, 1, containerHeight / visibleHeight);
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}
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}
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}
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} |