//--------------------------------------------------------
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// [Author]: 玩个游戏
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// [ Date ]: Wednesday, August 23, 2017
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//--------------------------------------------------------
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using UnityEngine;
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using UnityEngine.Sprites;
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using UnityEngine.UI;
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[RequireComponent(typeof(RectTransform))]
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public class Rhombus : BaseMeshEffect
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{
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const float SQUARE_ROOT_THREE = 1f;
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Vector3[] positions = new Vector3[3];
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RectTransform m_RectTransform;
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public RectTransform rectTransform {
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get {
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return m_RectTransform ?? (m_RectTransform = this.transform as RectTransform);
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}
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}
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Image m_Image;
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public Image image {
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get {
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return m_Image ?? (m_Image = this.GetComponent<Image>());
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}
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}
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public override void ModifyMesh(VertexHelper vh)
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{
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vh.Clear();
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var uv = this.image != 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) / this.rectTransform.rect.width;
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var uvScaleY = (uv.w - uv.y) / this.rectTransform.rect.height;
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var xoffset = this.rectTransform.rect.width * 0.5f;
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var yoffset = this.rectTransform.rect.height * 0.5f;
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this.positions[0] = new Vector3(0, yoffset);
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this.positions[1] = new Vector3(-xoffset, yoffset * (1f - SQUARE_ROOT_THREE));
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this.positions[2] = new Vector3(xoffset, yoffset * (1f - SQUARE_ROOT_THREE));
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for (var i = 0; i < 3; i++)
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{
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var position = this.positions[i];
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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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position = this.positions[i] * -1f;
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uv0 = new Vector2(position.x * uvScaleX + uvCenterX, position.y * uvScaleY + uvCenterY);
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vertex = UIUtility.PackageUIVertex(position, uv0, this.image.color);
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vh.AddVert(vertex);
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}
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vh.AddTriangle(0, 2, 4);
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vh.AddTriangle(1, 3, 5);
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}
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}
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