66 lines
2.4 KiB
C#
66 lines
2.4 KiB
C#
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using UnityEngine;
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using UnityEngine.UI;
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namespace HK.FUJIFILM
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{
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public static class ImageScaler
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{
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/// <summary>
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/// 将Image等比缩放到不超过指定的最大尺寸（宽和高中较大的值不超过maxSize）
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/// </summary>
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/// <param name="image">需要缩放的Image组件</param>
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/// <param name="maxSize">宽和高中较大值的最大限制</param>
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/// <param name="keepOriginalIfSmaller">如果原图比限制小，是否保持原图大小</param>
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public static void ScaleImageWithMaxSize(Image image, float maxSize, bool keepOriginalIfSmaller = false)
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{
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if (image == null)
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{
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Debug.LogError("Image组件不能为空！");
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return;
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}
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// 获取原始尺寸
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float originalWidth, originalHeight;
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if (image.sprite != null)
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{
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// 使用Sprite的原始尺寸
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originalWidth = image.sprite.rect.width;
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originalHeight = image.sprite.rect.height;
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}
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else
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{
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// 没有Sprite时使用当前RectTransform的尺寸
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originalWidth = image.rectTransform.rect.width;
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originalHeight = image.rectTransform.rect.height;
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}
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// 计算缩放比例
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float scaleRatio = CalculateScaleRatio(originalWidth, originalHeight, maxSize, keepOriginalIfSmaller);
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// 应用缩放后的尺寸
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image.rectTransform.sizeDelta = new Vector2(
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originalWidth * scaleRatio,
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originalHeight * scaleRatio
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);
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}
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/// <summary>
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/// 计算缩放比例
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/// </summary>
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private static float CalculateScaleRatio(float originalWidth, float originalHeight, float maxSize, bool keepOriginalIfSmaller)
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{
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// 找到原始宽高中的较大值
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float maxOriginal = Mathf.Max(originalWidth, originalHeight);
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// 如果原图的最大边小于等于限制值，且需要保持原图大小，则不缩放
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if (maxOriginal <= maxSize && keepOriginalIfSmaller)
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{
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return 1f; // 不缩放
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}
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// 计算缩放比例（让最大边刚好等于maxSize）
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return maxSize / maxOriginal;
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}
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}
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}
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