protected override void OnPopulateMesh(VertexHelper toFill)
{
// Vector4 v = GetDrawingDimensions();
// var uv = (overrideSprite != null) ? DataUtility.GetOuterUV(overrideSprite) : Vector4.zero;
// print("//?uv"+uv);
// var color32 = color;
// toFill.Clear();
// toFill.AddVert(new Vector3(v.x, v.y), color32, new Vector2(uv.x, uv.y));
// toFill.AddVert(new Vector3(v.x, v.w), color32, new Vector2(uv.x, uv.w));
// toFill.AddVert(new Vector3(v.z, v.w), color32, new Vector2(uv.z, uv.w));
// toFill.AddVert(new Vector3(v.z, v.y), color32, new Vector2(uv.z, uv.y));
// toFill.AddTriangle(0, 1, 2);
// toFill.AddTriangle(2, 3, 0);
vertexList = new List <Vector2>();
toFill.Clear();
//Sprite外部UV参数
Vector4 uv = overrideSprite != null?DataUtility.GetOuterUV(overrideSprite) : Vector4.zero;
//Vector2[] uvs = overrideSprite.uv;
//获取必要的参数
float width = rectTransform.rect.width;
float height = rectTransform.rect.height;
float uv_width = uv.z - uv.x;
float uv_height = uv.w - uv.y;
Vector2 uv_centre = new Vector2(uv_width * 0.5f + uv.x, uv_height * 0.5f + uv.y);
Vector2 rate = new Vector2(uv_width / width, uv_height / height);
//计算半径和弧度
float radius = redius <= 0 ? width / 2 : redius;
float radian = (2 * Mathf.PI) / segments;
//添加初始点
UIVertex origin = new UIVertex();
var spriteSize = new Vector2(overrideSprite.rect.width, overrideSprite.rect.height);
var spritePivot = overrideSprite.pivot / spriteSize;
var rectPivot = rectTransform.pivot;
Rect r = GetPixelAdjustedRect();
var drawingSize = new Vector2(r.width, r.height);
var spriteBoundSize = overrideSprite.bounds.size;
var drawOffset = (rectPivot - spritePivot) * drawingSize;
Vector2[] vertices = overrideSprite.vertices;
Vector2 origin_pos = new Vector2((0.5f - rectTransform.pivot.x) * width, (0.5f - rectTransform.pivot.y) * height);//原点位置
origin.color = color;
origin.position = origin_pos;
float uv_x = originPos.x * rate.x + uv_centre.x;
float uv_y = originPos.y * rate.y + uv_centre.y;
origin.uv0 = new Vector2(uv_x, uv_y);
toFill.AddVert(origin);
//添加其他点
// toFill.AddVert(new Vector3(v.x, v.y), color, new Vector2(uv.x, uv.y));
// toFill.AddVert(new Vector3(v.x, v.w), color, new Vector2(uv.x, uv.w));
// toFill.AddVert(new Vector3(v.z, v.w), color, new Vector2(uv.z, uv.w));
// toFill.AddVert(new Vector3(v.z, v.y), color, new Vector2(uv.z, uv.y));
float total_radian = 0;
for (int i = 0; i < segments + 1; i++)
{
//角度转为弧度
float x = Mathf.Cos(total_radian + MathTool.AngleToRadian(rotation)) * radius;
float y = Mathf.Sin(total_radian + MathTool.AngleToRadian(rotation)) * radius;
float real_x = x;
float real_y = y;
// float k = (origin_pos.y - y) / (origin_pos.x - x);
// if (x > v.z)
// {
// real_x = v.z;
// real_y = k * (real_x - x) + y;
// }
// if (x < v.x)
// {
// real_x = v.x;
// real_y = k * (real_x - x) + y;
// }
// if (y > v.w)
// {
// real_y = v.w;
// real_x = (real_y - y) / k + x;
// }
// if (y < v.y)
// {
// real_y = v.y;
// real_x = (real_y - y) / k + x;
// }
total_radian += radian;
origin = new UIVertex();
Vector2 other_pos = new Vector2(real_x, real_y) + origin_pos;
origin.color = color;
origin.position = other_pos;
uv_x = ((originPos.x + x) * rate.x + uv_centre.x);
uv_y = ((originPos.y + y) * rate.y + uv_centre.y);
origin.uv0 = new Vector2(uv_x, uv_y);
toFill.AddVert(origin);
vertexList.Add(other_pos);
}
//绘制圆形
for (int i = 1; i <= segments; i++)
{
toFill.AddTriangle(i, 0, i + 1);
}
}