MRClass/Assets/Scripts/Core/DrawingOnLine/DrawingMap.cs

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

public class DrawingMap : MonoBehaviour
{

    [SerializeField]
    private Image colorImage;//颜色池
    private Texture2D temp_texture;

    void Start()
    {
        InitColor();
    }

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

    private void InitColor()
    {
        temp_texture  = this.colorImage.mainTexture as Texture2D;
        //CDebug.Log("texture.height"  + texture.height  + "texture.width" + texture.width);
        int addValue = (temp_texture.width - 1) / 3;
        Color value0 = (Color.green - Color.red) / addValue;
        Color value1 = (Color.blue - Color.green) / addValue;
        Color value2 = (Color.red - Color.blue) / addValue;
        for (int x = 0; x < temp_texture.width; x++)
        {
            for (int y = 0; y < temp_texture.height; y++)
            {
                if (x < addValue)
                {
                    temp_texture.SetPixel(x, y, Color.red + value0 * x);
                }
                else if (x < addValue * 2)
                {
                    temp_texture.SetPixel(x, y, Color.green + value1 * (x - addValue));
                }
                else
                {
                    temp_texture.SetPixel(x, y, Color.blue + value2 * (x - addValue * 2));
                }
            }
        }
      //  this.colorImage.sprite = Sprite.Create(temp_texture, new Rect(0, 0, 256f,128f), Vector2.zero);
         temp_texture.Apply();
       // this.colorImage.material.mainTexture = temp_texture;
    }

    public Color GetColorByPoint(Vector2 point)
    {
        return temp_texture.GetPixel((int) point.x, (int)point.y);
    }
}