ColorPalette.cs

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using System;
using Empyrean.Utils;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
 
namespace Empyrean.ColorPicker;
 
public class ColorPalette : MonoBehaviour, IDragHandler, IEventSystemHandler, IPointerDownHandler, IInitializePotentialDragHandler
{
    private HSVColor current;
 
    private Color[] colorArray;
 
    private Texture2D texture;
 
    [SerializeField]
    private RawImage paletteImage;
 
    [SerializeField]
    private RectTransform marker;
 
    [SerializeField]
    private RectTransform dropperSelectionMarker;
 
    private bool initiated;
 
    public Vector2 MarkerPosition => marker.anchorMin;
 
    public event Action<Vector2> ColorPicked = delegate
    {
    };
 
    private void Awake()
    {
        Init();
    }
 
    private void Init()
    {
        if (!initiated)
        {
            initiated = true;
            int width = paletteImage.mainTexture.width;
            int height = paletteImage.mainTexture.height;
            texture = new Texture2D(width, height, TextureFormat.RGB24, mipChain: false);
            colorArray = new Color[width * height];
        }
    }
 
    public void SelectColor(HSVColor hsv)
    {
        Init();
        if (Mathf.Approximately(current.h, current.h))
        {
            GeneratePaletteTexture(hsv);
        }
        UpdateMarkerPosition(hsv);
    }
 
    public void OnPointerDown(PointerEventData eventData)
    {
        OnDrag(eventData);
    }
 
    public void OnDrag(PointerEventData eventData)
    {
        this.ColorPicked(GetNormalisedPointerPosition(eventData.position));
    }
 
    private Vector2 GetNormalisedPointerPosition(Vector2 position)
    {
        Vector2 clampedLocalPosition = GetClampedLocalPosition(position);
        return new Vector2(clampedLocalPosition.x / paletteImage.rectTransform.rect.width, clampedLocalPosition.y / paletteImage.rectTransform.rect.height);
    }
 
    public void OnInitializePotentialDrag(PointerEventData ped)
    {
        ped.useDragThreshold = false;
    }
 
    private Vector2 GetClampedLocalPosition(Vector2 position)
    {
        Vector3 vector = paletteImage.gameObject.transform.InverseTransformPoint(position);
        vector.x = Mathf.Clamp(vector.x, 0f, paletteImage.rectTransform.rect.width);
        vector.y = Mathf.Clamp(vector.y, 0f, paletteImage.rectTransform.rect.height);
        return vector;
    }
 
    private void GeneratePaletteTexture(HSVColor hsv)
    {
        current = hsv;
        int width = texture.width;
        for (int i = 0; i < width; i++)
        {
            for (int num = width - 1; num > 0; num--)
            {
                colorArray[i * width - 1 + num] = Colorist.HSVtoRGB(current.h, (float)num / (float)width, (float)i / (float)width);
            }
        }
        texture.SetPixels(colorArray);
        texture.Apply();
        paletteImage.texture = texture;
    }
 
    public void UpdateMarkerPosition(HSVColor hsv)
    {
        SetMarkerPosition(new Vector2(hsv.s, hsv.v));
    }
 
    private void SetMarkerPosition(Vector2 position)
    {
        marker.anchorMin = position;
        marker.anchorMax = position;
    }
 
    public void ShowEnlargedPixels(Color[] colors)
    {
        Color[] array = new Color[texture.width * texture.height];
        for (int i = 0; i < texture.width; i++)
        {
            for (int j = 0; j < texture.width; j++)
            {
                int num = i * texture.width + j;
                int num2 = i / 32 * 16 + j / 32;
                array[num] = colors[num2];
            }
        }
        texture.SetPixels(array);
        texture.Apply();
        paletteImage.texture = texture;
    }
 
    public void ShowDropperMarker(bool value)
    {
        marker.gameObject.SetActive(!value);
        dropperSelectionMarker.gameObject.SetActive(value);
    }
}