using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class ScrollIndexCallback1 : MonoBehaviour 
{
    public Image image;
	public Text text;

    void ScrollCellIndex (int idx) 
    {
		string name = "Cell " + idx.ToString ();
		if (text != null) 
        {
			text.text = name;
		}
        if (image != null)
        {
            image.color = Rainbow(idx / 50.0f);
        }
		gameObject.name = name;
	}

    // http://stackoverflow.com/questions/2288498/how-do-i-get-a-rainbow-color-gradient-in-c
    public static Color Rainbow(float progress)
    {
        progress = Mathf.Clamp01(progress);
        float r = 0.0f;
        float g = 0.0f;
        float b = 0.0f;
        int i = (int)(progress * 6);
        float f = progress * 6.0f - i;
        float q = 1 - f;

        switch (i % 6)
        {
            case 0:
                r = 1;
                g = f;
                b = 0;
                break;
            case 1:
                r = q;
                g = 1;
                b = 0;
                break;
            case 2:
                r = 0;
                g = 1;
                b = f;
                break;
            case 3:
                r = 0;
                g = q;
                b = 1;
                break;
            case 4:
                r = f;
                g = 0;
                b = 1;
                break;
            case 5:
                r = 1;
                g = 0;
                b = q;
                break;
        }
        return new Color(r, g, b);
    }
}