RectTransform、Texture2d 绽放问题

1、缩小一个Texture2d

代码：

/// <summary>/// 缩小一个texture/// </summary>/// <param name="originTexture"></param>/// <param name="rate"></param>/// <returns></returns>Texture2D CeateTexture_With_Scale(Texture2D originTexture, float rate){    if (rate >= 1f)    {        return originTexture;    }    int with = (int)(originTexture.width * rate);    int height = (int)(originTexture.height * rate);    int count = with * height;    Texture2D textrue = new Texture2D(with, height, TextureFormat.ARGB32, false);    Color32[] originColors = originTexture.GetPixels32();    Color32[] colors = new Color32[count];    float _1_rate = 1 / rate;    for (int y = 0; y < height; y++)    {        for (int x = 0; x < with; x++)        {            int i = x + y * with;            int j = (int)(_1_rate * x) + (int)(_1_rate * y) * originTexture.width;            colors[i] = originColors[j];        }    }    textrue.SetPixels32(colors);    textrue.Apply();    return textrue;}

2、缩放一个RawImage的UV，使用的它的Texture不变形

//[lzh]using UnityEngine;using UnityEngine.UI;using System.Collections;public class Test : MonoBehaviour{    public RawImage rawImg;    public RectTransform rtRawImg;    private Texture texture;    // Use this for initialization    void Start ()    {        texture = rawImg.texture;        ScaleUV();    }    void ScaleUV()    {        Vector2 rtSize = rtRawImg.rect.size;        Vector2 texSize = new Vector2(texture.width, texture.height);        //Debug.Log(rtSize);        float rateRt = rtSize.y / rtSize.x;        float rateTex = texSize.y / texSize.x;        float temp = rateTex / rateRt;        Debug.Log(temp);        if(temp<1)        {            //rawImg.uvRect.x = 0.5f * (temp - 1);            rawImg.uvRect = new Rect(0.5f * (1-temp), 1f, temp, 1f);        }        else if(temp > 1)        {            temp = 1 / temp;            rawImg.uvRect = new Rect(1f, 0.5f * (1 - temp),1f, temp);        }    }}