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NGUIMathf里有个calculateRelativeWidgeBounds(Transform content) 的函数 用来计算 content下(包括content)的bounds UGUI没有找到类似的功能 于是自己仿照这写了个UGUIMathf
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;
public class UGUIMathf : MonoBehaviour
{
/// <summary>
/// 计算content相对父级的bounds
/// </summary>
/// <param name="content"></param>
/// <returns></returns>
public static Bounds calculateRelativeBounds(RectTransform content)
{
return calculateRelativeBounds(content.parent, content);
}
/// <summary>
/// 计算相对于relativeTo的bounds
/// </summary>
/// <param name="relativeTo"></param>
/// <param name="content"></param>
/// <returns></returns>
public static Bounds calculateRelativeBounds(Transform relativeTo, RectTransform content)
{
Bounds bounds=calculateWorldBounds(content);
if (relativeTo != null)
{
Vector3 temp;
temp=relativeTo.InverseTransformPoint(bounds.size);
temp.z = 0;
bounds.size = temp;
temp=relativeTo.InverseTransformPoint(bounds.center);
temp.z = 0;
bounds.center = temp;
bounds.extents = bounds.size / 2f;
bounds.min = bounds.center - bounds.extents;
bounds.max = bounds.center + bounds.extents;
}
return bounds;
}
/// <summary>
/// 计算content相对世界坐标的bounds
/// </summary>
/// <param name="content"></param>
/// <returns></returns>
public static Bounds calculateWorldBounds(RectTransform content)
{
Bounds bounds=new Bounds();
Vector2 min = new Vector2(float.MaxValue,float.MaxValue);
Vector2 max = new Vector2(float.MinValue,float.MinValue);
getRect(content, ref min, ref max);
bounds.size = max - min;
bounds.center = (max + min) / 2f;
bounds.extents = bounds.size / 2f;
bounds.min = bounds.center - bounds.extents;
bounds.max = bounds.center + bounds.extents;
return bounds;
}
/// <summary>
/// 计算content的最大边框
/// </summary>
/// <param name="content"></param>
/// <param name="min"></param>
/// <param name="max"></param>
public static void getRect(RectTransform content,ref Vector2 min,ref Vector2 max)
{
Vector3[] corners = new Vector3[4];
content.GetWorldCorners(corners);
min.x = Mathf.Min(new float[] { min.x, corners[0].x, corners[2].x });
min.y = Mathf.Min(new float[] { min.y, corners[0].y, corners[2].y });
max.x = Mathf.Max(new float[] { max.x, corners[0].x, corners[2].x });
max.y = Mathf.Max(new float[] { max.y, corners[0].y, corners[2].y });
for (int i = 0, imax = content.childCount; i < imax; i++)
{
getRect(content.GetChild(i)as RectTransform, ref min, ref max);
}
}
}
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