using UnityEngine;
using UnityEngine.UI;

[DisallowMultipleComponent]
[RequireComponent(typeof(RectTransform))]
public class SectionImage:Graphic {

    [SerializeField]
    [Range(2,100)]
    int m_Section = 3;
    public int section {
        get {
            return m_Section;
        }
    }

    [SerializeField]
    [Range(1,200)]
    float m_Width = 2f;
    public float width {
        get {
            return m_Width;
        }
    }

    Vector2[] uv0s= new Vector2[4] { Vector2.one,Vector2.one,Vector2.one,Vector2.one };

    protected override void OnPopulateMesh(VertexHelper vh) {
        vh.Clear();

        var size = new Vector2(rectTransform.rect.width,rectTransform.rect.height);

        var squareCount = section - 1;
        var deltaX = (size.x - (section - 1) * width) / section + width;
        var startX = -size.x * 0.5f + deltaX - width;

        for(var i = 0;i < squareCount;i++) {

            var positions = new Vector3[4];

            positions[0] = new Vector2(startX,-size.y * 0.5f);
            positions[1] = new Vector2(startX + width,-size.y * 0.5f);
            positions[2] = new Vector2(startX + width,size.y * 0.5f);
            positions[3] = new Vector2(startX,size.y * 0.5f);

            UIUtility.AddQuad(vh,positions,color,uv0s);
            startX += deltaX;
        }

    }
}