//--------------------------------------------------------
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// [Author]: 玩个游戏
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// [ Date ]: Thursday, August 10, 2017
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//--------------------------------------------------------
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using UnityEngine;
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using System.Collections;
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using UnityEngine.UI;
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using UnityEngine.Sprites;
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using System;
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[DisallowMultipleComponent]
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[RequireComponent(typeof(Image))]
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public class CustomImage:BaseMeshEffect {
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[SerializeField]
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Vector2[] m_Points;
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public Vector2[] points {
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get {
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return this.m_Points;
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}
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set {
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this.m_Points = value;
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SetVerticesDirty();
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}
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}
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private Image m_Image;
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public Image image {
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get {
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return this.m_Image ?? (this.m_Image = this.AddMissingComponent<Image>());
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}
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}
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public void SetVerticesDirty() {
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this.graphic.SetVerticesDirty();
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}
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public override void ModifyMesh(VertexHelper vh) {
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vh.Clear();
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if(this.image == null) {
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throw new NullReferenceException();
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}
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if(this.points == null || this.points.Length < 3) {
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return;
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}
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var width = this.image.rectTransform.rect.width;
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var height = this.image.rectTransform.rect.height;
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var uv = this.image.overrideSprite != null ? DataUtility.GetOuterUV(this.image.overrideSprite) : Vector4.zero;
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var uvcenterX = (uv.x + uv.z) * 0.5f;
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var uvcenterY = (uv.y + uv.w) * 0.5f;
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var uvscaleX = (uv.z - uv.x) / width;
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var uvscaleY = (uv.w - uv.y) / height;
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for(var i = 0;i < this.points.Length;i++) {
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var point = this.points[i];
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var position = new Vector2(point.x,point.y);
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var uv0 = new Vector2(position.x * uvscaleX + uvcenterX,position.y * uvscaleY + uvcenterY);
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var vertex = UIUtility.PackageUIVertex(position,uv0,this.image.color);
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vh.AddVert(vertex);
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}
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var vertexCount = this.points.Length;
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var index = 0;
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for(;index < vertexCount - 2;index++) {
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vh.AddTriangle(index,index + 1,index + 2);
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}
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}
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}
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