//--------------------------------------------------------
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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 UnityEngine.UI;
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/// <summary>
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/// 这个组件接收一些顶点，绘制出水平和垂直的线。
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/// </summary>
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public class PolylineImage:Graphic {
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[SerializeField]
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float m_Width;
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public float width {
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get {
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return this.m_Width;
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}
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set {
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this.m_Width = value;
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base.SetVerticesDirty();
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}
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}
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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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base.SetVerticesDirty();
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}
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}
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protected override void OnPopulateMesh(VertexHelper vh) {
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vh.Clear();
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if(this.points == null || this.points.Length < 2) {
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return;
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}
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var hw = this.width * 0.5f;
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for(var i = 0;i < this.points.Length - 1;i++) {
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var point = this.points[i];
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var nextPoint = this.points[i + 1];
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var xReversal = point.x > nextPoint.x;
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var yReversal = point.y > nextPoint.y;
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var positions = new Vector3[4];
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positions[0] = new Vector2(xReversal ? point.x + hw : point.x - hw,yReversal ? point.y + hw : point.y - hw);
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positions[1] = new Vector2(xReversal ? nextPoint.x - hw : nextPoint.x + hw,yReversal ? point.y + hw : point.y - hw);
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positions[2] = new Vector2(xReversal ? nextPoint.x - hw : nextPoint.x + hw,yReversal ? nextPoint.y - hw : nextPoint.y + hw);
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positions[3] = new Vector2(xReversal ? point.x + hw : point.x - hw,yReversal ? nextPoint.y - hw : nextPoint.y + hw);
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UIUtility.AddQuad(vh,positions,color,new Vector2[4] { Vector2.one,Vector2.one,Vector2.one,Vector2.one });
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}
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}
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}
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