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 /* Image based color picker for Unity UI by SecretAnorak Feb 2018
  * 1 - Simply add this component to any UI Image to expose an "OnColorPicked" Event.
  * 2 - Ensure your source image (Sprite) is marked as "Read/Write Enabled" in the Texture Import Settings.
  * 3 - Scale the image as you like but DO NOT use preserve aspect on your image. The image must fill the entire RectTransform for this script to work.*/
 
 using System;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.Events;
 using UnityEngine.EventSystems;
 
 public class ImageColorPicker : MonoBehaviour, IPointerClickHandler
 {
     public Color selectedColor;
 
     [Serializable]
     public class ColorEvent : UnityEvent<Color> { }
     public ColorEvent OnColorPicked = new ColorEvent();
 
     public void OnPointerClick(PointerEventData eventData)
     {
         selectedColor = GetColor(GetPointerUVPosition());
         OnColorPicked.Invoke(selectedColor);
     }
 
     private Color GetColor(Vector2 pos)
     {
         Texture2D texture = GetComponent<Image>().sprite.texture;
         Color selected = texture.GetPixelBilinear(pos.x, pos.y);
         selected.a = 1; // force full alpha
         return selected;
     }
 
     Vector2 GetPointerUVPosition()
     {
         Vector3[] imageCorners = new Vector3[4];
         gameObject.GetComponent<RectTransform>().GetWorldCorners(imageCorners);
         float texWidth = imageCorners[2].x - imageCorners[0].x;
         float texHeight = imageCorners[2].y - imageCorners[0].y;
         float uvX = (Input.mousePosition.x - imageCorners[0].x) / texWidth;
         float uvY = (Input.mousePosition.y - imageCorners[0].y) / texHeight;
         return new Vector2(uvX, uvY);
     }
 }