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

public class o0UIRawImageTester : MonoBehaviour
{
    static HashSet<o0UIRawImageTester> Testers = new HashSet<o0UIRawImageTester>();
    public static void UpdateAllOffset()
    {
        foreach (var i in Testers)
            i.UpdateOffset();
    }


    RawImage Image;
    Texture2D Texture;
    int Offset = 0;
    // Start is called before the first frame update
    void Awake()
    {
        Testers.Add(this);

        Image = GetComponent<RawImage>();
        var rect = GetComponent<RectTransform>().rect;
        Texture = new Texture2D((int)rect.width, (int)rect.height);
        Image.texture = Texture;


        ColorBuffer[new Color(1, 0, 0)] = new Color[] { new Color(1, 0, 0) , new Color(1, 0, 0) };
        //Debug.Log(ColorBuffer[new Color(1, 0, 0)].Length);
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    static Dictionary<Color, Color[]> ColorBuffer = new Dictionary<Color, Color[]>();
    static Color[] GetColorArray(Color color, int length)
    {
        if (ColorBuffer.ContainsKey(color))
        {
            if (ColorBuffer[color].Length >= length)
                return ColorBuffer[color];
            else
                ColorBuffer.Remove(color);
        }
        var c = new Color[length];
        for (var i = 0; i < c.Length; ++i)
            c[i] = color;
        ColorBuffer.Add(color, c);
        return c;
    }
    public void DrawPoint(int height, Color color)
    {
        if (height > Texture.height)
            height = Texture.height;
        else if (height < 0)
            height = 0;
        Texture.SetPixel(Offset, height, color);
        Texture.Apply();
    }
    public void DrawLine(int height, Color color)
    {
        if (height > Texture.height)
            height = Texture.height;
        else if (height < 0)
            height = 0;
        Texture.SetPixels(Offset, 0, 1, height, GetColorArray(color, height));
        Texture.Apply();
    }
    public void DrawPoint(float height, Color color)
    {
        DrawPoint((int)(height * Texture.height), color);
    }
    public void DrawLine(float height, Color color)
    {
        DrawLine((int)(height * Texture.height), color);
    }
    public virtual void UpdateOffset()
    {
        ++Offset;
        if (Offset >= Texture.width)
            Offset = 0;

        var rect = Image.uvRect;
        rect.x = (float)(Offset+1) / Texture.width;
        Image.uvRect = rect;

        DrawLine(1f,new Color(1,1,1,0.5f));
    }
}