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187 rivejä
6.4 KiB
187 rivejä
6.4 KiB
using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.Sprites;
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[AddComponentMenu("UI/Circle Image")]
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public class CircleImage : BaseImage {
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// Use this for initialization
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void Awake () {
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innerVertices = new List<Vector3>();
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outterVertices = new List<Vector3>();
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}
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// Update is called once per frame
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void Update () {
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this.thickness = (float)Mathf.Clamp(this.thickness, 0, rectTransform.rect.width / 2);
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}
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[Tooltip("圆形或扇形填充比例")]
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[Range(0, 1)]
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public float fillPercent = 1f;
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[Tooltip("是否填充圆形")]
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public bool fill = true;
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[Tooltip("圆环宽度")]
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public float thickness = 5;
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[Tooltip("圆形")]
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[Range(3, 100)]
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public int segements = 20;
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private List<Vector3> innerVertices;
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private List<Vector3> outterVertices;
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protected override void OnPopulateMesh(VertexHelper vh)
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{
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vh.Clear();
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innerVertices.Clear();
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outterVertices.Clear();
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float degreeDelta = (float)(2 * Mathf.PI / segements);
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int curSegements = (int)(segements * fillPercent);
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float tw = rectTransform.rect.width;
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float th = rectTransform.rect.height;
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float outerRadius = rectTransform.pivot.x * tw;
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float innerRadius = rectTransform.pivot.x * tw - thickness;
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Vector4 uv = overrideSprite != null ? DataUtility.GetOuterUV(overrideSprite) : Vector4.zero;
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float uvCenterX = (uv.x + uv.z) * 0.5f;
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float uvCenterY = (uv.y + uv.w) * 0.5f;
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float uvScaleX = (uv.z - uv.x) / tw;
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float uvScaleY = (uv.w - uv.y) / th;
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float curDegree = 0;
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UIVertex uiVertex;
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int verticeCount;
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int triangleCount;
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Vector2 curVertice;
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if (fill) //圆形
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{
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curVertice = Vector2.zero;
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verticeCount = curSegements + 1;
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uiVertex = new UIVertex();
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uiVertex.color = color;
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uiVertex.position = curVertice;
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uiVertex.uv0 = new Vector2(curVertice.x * uvScaleX + uvCenterX, curVertice.y * uvScaleY + uvCenterY);
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vh.AddVert(uiVertex);
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for (int i = 1; i < verticeCount; i++)
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{
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float cosA = Mathf.Cos(curDegree);
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float sinA = Mathf.Sin(curDegree);
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curVertice = new Vector2(cosA * outerRadius, sinA * outerRadius);
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curDegree += degreeDelta;
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uiVertex = new UIVertex();
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uiVertex.color = color;
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uiVertex.position = curVertice;
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uiVertex.uv0 = new Vector2(curVertice.x * uvScaleX + uvCenterX, curVertice.y * uvScaleY + uvCenterY);
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vh.AddVert(uiVertex);
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outterVertices.Add(curVertice);
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}
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triangleCount = curSegements*3;
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for (int i = 0, vIdx = 1; i < triangleCount - 3; i += 3, vIdx++)
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{
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vh.AddTriangle(vIdx, 0, vIdx+1);
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}
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if (fillPercent == 1)
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{
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//首尾顶点相连
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vh.AddTriangle(verticeCount - 1, 0, 1);
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}
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}
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else//圆环
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{
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verticeCount = curSegements*2;
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for (int i = 0; i < verticeCount; i += 2)
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{
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float cosA = Mathf.Cos(curDegree);
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float sinA = Mathf.Sin(curDegree);
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curDegree += degreeDelta;
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curVertice = new Vector3(cosA * innerRadius, sinA * innerRadius);
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uiVertex = new UIVertex();
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uiVertex.color = color;
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uiVertex.position = curVertice;
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uiVertex.uv0 = new Vector2(curVertice.x * uvScaleX + uvCenterX, curVertice.y * uvScaleY + uvCenterY);
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vh.AddVert(uiVertex);
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innerVertices.Add(curVertice);
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curVertice = new Vector3(cosA * outerRadius, sinA * outerRadius);
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uiVertex = new UIVertex();
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uiVertex.color = color;
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uiVertex.position = curVertice;
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uiVertex.uv0 = new Vector2(curVertice.x * uvScaleX + uvCenterX, curVertice.y * uvScaleY + uvCenterY);
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vh.AddVert(uiVertex);
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outterVertices.Add(curVertice);
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}
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triangleCount = curSegements*3*2;
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for (int i = 0, vIdx = 0; i < triangleCount - 6; i += 6, vIdx += 2)
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{
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vh.AddTriangle(vIdx+1, vIdx, vIdx+3);
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vh.AddTriangle(vIdx, vIdx + 2, vIdx + 3);
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}
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if (fillPercent == 1)
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{
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//首尾顶点相连
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vh.AddTriangle(verticeCount - 1, verticeCount - 2, 1);
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vh.AddTriangle(verticeCount - 2, 0, 1);
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}
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}
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}
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public override bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
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{
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Sprite sprite = overrideSprite;
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if (sprite == null)
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return true;
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Vector2 local;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screenPoint, eventCamera, out local);
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return Contains(local, outterVertices, innerVertices);
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}
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private bool Contains(Vector2 p, List<Vector3> outterVertices, List<Vector3> innerVertices)
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{
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var crossNumber = 0;
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RayCrossing(p, innerVertices, ref crossNumber);//检测内环
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RayCrossing(p, outterVertices, ref crossNumber);//检测外环
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return (crossNumber & 1) == 1;
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}
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/// <summary>
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/// 使用RayCrossing算法判断点击点是否在封闭多边形里
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/// </summary>
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/// <param name="p"></param>
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/// <param name="vertices"></param>
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/// <param name="crossNumber"></param>
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private void RayCrossing(Vector2 p, List<Vector3> vertices, ref int crossNumber)
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{
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for (int i = 0, count = vertices.Count; i < count; i++)
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{
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var v1 = vertices[i];
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var v2 = vertices[(i + 1) % count];
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//点击点水平线必须与两顶点线段相交
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if (((v1.y <= p.y) && (v2.y > p.y))
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|| ((v1.y > p.y) && (v2.y <= p.y)))
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{
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//只考虑点击点右侧方向，点击点水平线与线段相交，且交点x > 点击点x，则crossNumber+1
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if (p.x < v1.x + (p.y - v1.y) / (v2.y - v1.y) * (v2.x - v1.x))
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{
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crossNumber += 1;
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}
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}
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}
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}
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}
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