SliderBackgroundController.cs

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using System.Collections;
using Empyrean.Utils;
using UnityEngine;
using UnityEngine.UI;
 
namespace Empyrean.ColorPicker;
 
public class SliderBackgroundController : MonoBehaviour
{
    [SerializeField]
    private ColorPicker colorPicker;
 
    [SerializeField]
    private RawImage sliderBackground;
 
    private LabeledColorSlider parent;
 
    private Color[] colorArray;
 
    private void Awake()
    {
        colorPicker.ColorUpdated += UpdateBackround;
    }
 
    private void UpdateBackround(Color color)
    {
        GenerateSliderTexture();
    }
 
    private void GenerateSliderTexture()
    {
        Color[] array = ((parent.Type == SliderType.Hue) ? HueSlider.GenerateHsvSpectrum() : GenerateColorSpectrum());
        Texture2D texture2D = new Texture2D(array.Length, 1);
        for (int i = 0; i < texture2D.width; i++)
        {
            texture2D.SetPixel(i, 1, array[i]);
        }
        texture2D.Apply();
        sliderBackground.texture = texture2D;
    }
 
    private Color[] GenerateColorSpectrum()
    {
        Color[] array = new Color[256];
        for (int i = 0; i < 256; i++)
        {
            array[i] = GetColorByTypeAndIndex(i);
        }
        return array;
    }
 
    private Color GetColorByTypeAndIndex(int index)
    {
        Color selectedColor = colorPicker.SelectedColor;
        switch (parent.Type)
        {
        case SliderType.Red:
            return new Color((float)index / 255f, selectedColor.g, selectedColor.b, 1f);
        case SliderType.Green:
            return new Color(selectedColor.r, (float)index / 255f, selectedColor.b, 1f);
        case SliderType.Blue:
            return new Color(selectedColor.r, selectedColor.g, (float)index / 255f, 1f);
        case SliderType.Sat:
        {
            float v = ((colorPicker.ValueHSV >= 0.3f) ? colorPicker.ValueHSV : 0.3f);
            return new HSVColor(colorPicker.Hue, (float)index / 255f, v).ToRGB();
        }
        case SliderType.Val:
            return new HSVColor(colorPicker.Hue, colorPicker.Saturation, (float)index / 255f).ToRGB();
        case SliderType.Alpha:
            return new Color(1f, 1f, 1f, (float)index / 255f);
        default:
            return Color.red;
        }
    }
 
    public void Init(LabeledColorSlider parent)
    {
        this.parent = parent;
    }
 
    public void ToggleSliderMode()
    {
        StartCoroutine(DelayedUpdateBg());
    }
 
    private IEnumerator DelayedUpdateBg()
    {
        yield return null;
        UpdateBackround(colorPicker.SelectedColor);
    }
}