rawImage直角变圆角

rawImage直角变圆角
，其他的不多说了上代码。

using UnityEngine;

using System.Collections.Generic;

using UnityEngine.UI;

public class yuanjiao : RawImage

{

// public float Radius = 10f;//内切圆半径 图片的一半差不多就是一个圆了 这里相当于图片十分之一的长度

// public int TriangleNum = 6;//每个扇形三角形个数 个数越大弧度越平滑

public float Radius = 20f;//内切圆半径 图片的一半差不多就是一个圆了 这里相当于图片十分之一的长度public int TriangleNum = 6;//每个扇形三角形个数 个数越大弧度越平滑protected override void OnPopulateMesh(VertexHelper vh){vh.Clear();float tw = rectTransform.rect.width;//图片的宽float th = rectTransform.rect.height;//图片的高float twr = tw / 2;float thr = th / 2;if (Radius < 0)Radius = 0;float radius = tw / Radius;//半径这里需要动态计算确保不会被拉伸if (radius > twr)radius = twr;if (radius < 0)radius = 0;if (TriangleNum <= 0)TriangleNum = 1;UIVertex vert = UIVertex.simpleVert;vert.color = color;//左边矩形AddVert(new Vector2(-twr, -thr + radius), tw, th, vh, vert);AddVert(new Vector2(-twr, thr - radius), tw, th, vh, vert);AddVert(new Vector2(-twr + radius, thr - radius), tw, th, vh, vert);AddVert(new Vector2(-twr + radius, -thr + radius), tw, th, vh, vert);vh.AddTriangle(0, 1, 2);vh.AddTriangle(0, 2, 3);//中间矩形AddVert(new Vector2(-twr + radius, -thr), tw, th, vh, vert);AddVert(new Vector2(-twr + radius, thr), tw, th, vh, vert);AddVert(new Vector2(twr - radius, thr), tw, th, vh, vert);AddVert(new Vector2(twr - radius, -thr), tw, th, vh, vert);vh.AddTriangle(4, 5, 6);vh.AddTriangle(4, 6, 7);//右边矩形AddVert(new Vector2(twr - radius, -thr + radius), tw, th, vh, vert);AddVert(new Vector2(twr - radius, thr - radius), tw, th, vh, vert);AddVert(new Vector2(twr, thr - radius), tw, th, vh, vert);AddVert(new Vector2(twr, -thr + radius), tw, th, vh, vert);vh.AddTriangle(8, 9, 10);vh.AddTriangle(8, 10, 11);List CirclePoint = new List();//圆心列表Vector2 pos0 = new Vector2(-twr + radius, -thr + radius);//左下角圆心Vector2 pos1 = new Vector2(-twr, -thr + radius);//决定首次旋转方向的点Vector2 pos2;CirclePoint.Add(pos0);CirclePoint.Add(pos1);pos0 = new Vector2(-twr + radius, thr - radius);//左上角圆心pos1 = new Vector2(-twr + radius, thr);CirclePoint.Add(pos0);CirclePoint.Add(pos1);pos0 = new Vector2(twr - radius, thr - radius);//右上角圆心pos1 = new Vector2(twr, thr - radius);CirclePoint.Add(pos0);CirclePoint.Add(pos1);pos0 = new Vector2(twr - radius, -thr + radius);//右下角圆心pos1 = new Vector2(twr - radius, -thr);CirclePoint.Add(pos0);CirclePoint.Add(pos1);float degreeDelta = (float)(Mathf.PI / 2 / TriangleNum);//每一份等腰三角形的角度 默认6份List degreeDeltaList = new List() { Mathf.PI, Mathf.PI / 2, 0, (float)3 / 2 * Mathf.PI };for (int j = 0; j < CirclePoint.Count; j += 2){float curDegree = degreeDeltaList[j / 2];//当前的角度AddVert(CirclePoint[j], tw, th, vh, vert);//添加扇形区域所有三角形公共顶点int thrdIndex = vh.currentVertCount;//当前三角形第二顶点索引int TriangleVertIndex = vh.currentVertCount - 1;//一个扇形保持不变的顶点索引List pos2List = new List();for (int i = 0; i < TriangleNum; i++){curDegree += degreeDelta;if (pos2List.Count == 0){AddVert(CirclePoint[j + 1], tw, th, vh, vert);}else{vert.position = pos2List[i - 1];vert.uv0 = new Vector2(pos2List[i - 1].x + 0.5f, pos2List[i - 1].y + 0.5f);}pos2 = new Vector2(CirclePoint[j].x + radius * Mathf.Cos(curDegree), CirclePoint[j].y + radius * Mathf.Sin(curDegree));AddVert(pos2, tw, th, vh, vert);vh.AddTriangle(TriangleVertIndex, thrdIndex, thrdIndex + 1);thrdIndex++;pos2List.Add(vert.position);}}}protected Vector2[] GetTextureUVS(Vector2[] vhs, float tw, float th){int count = vhs.Length;Vector2[] uvs = new Vector2[count];for (int i = 0; i < uvs.Length; i++){uvs[i] = new Vector2(vhs[i].x / tw + 0.5f, vhs[i].y / th + 0.5f);//矩形的uv坐标  因为uv坐标原点在左下角，vh坐标原点在中心 所以这里加0.5（uv取值范围0~1）}return uvs;}protected void AddVert(Vector2 pos0, float tw, float th, VertexHelper vh, UIVertex vert){vert.position = pos0;vert.uv0 = GetTextureUVS(new[] { new Vector2(pos0.x, pos0.y) }, tw, th)[0];vh.AddVert(vert);}

}

效果如图

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