CurveEffect.cs

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using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
 
[AddComponentMenu("UI/ToJ Effects/Curve Effect", 6)]
[RequireComponent(typeof(Text))]
public class CurveEffect : BaseMeshEffect
{
    public enum CurveMode
    {
        TextArea,
        FullRect
    }
 
    [SerializeField]
    private CurveMode m_CurveMode;
 
    [SerializeField]
    private AnimationCurve m_Curve = new AnimationCurve(new Keyframe(0f, 0f, 0f, 2f), new Keyframe(1f, 0f, -2f, 0f));
 
    [SerializeField]
    private float m_Strength = 1f;
 
    private List<UIVertex> m_Verts = new List<UIVertex>();
 
    public AnimationCurve curve
    {
        get
        {
            return m_Curve;
        }
        set
        {
            if (m_Curve != value)
            {
                m_Curve = value;
                if (base.graphic != null)
                {
                    base.graphic.SetVerticesDirty();
                }
            }
        }
    }
 
    public float strength
    {
        get
        {
            return m_Strength;
        }
        set
        {
            if (m_Strength != value)
            {
                m_Strength = value;
                if (base.graphic != null)
                {
                    base.graphic.SetVerticesDirty();
                }
            }
        }
    }
 
    protected CurveEffect()
    {
    }
 
    public override void ModifyMesh(VertexHelper vh)
    {
        if (!IsActive())
        {
            return;
        }
        vh.GetUIVertexStream(m_Verts);
        if (m_Verts.Count == 0)
        {
            return;
        }
        Vector2 zero = Vector2.zero;
        Vector2 zero2 = Vector2.zero;
        if (m_CurveMode == CurveMode.FullRect)
        {
            Rect rect = GetComponent<RectTransform>().rect;
            zero = new Vector2(rect.xMin, rect.yMax);
            zero2 = new Vector2(rect.xMax, rect.yMin);
        }
        else
        {
            zero = m_Verts[0].position;
            zero2 = m_Verts[m_Verts.Count - 1].position;
            for (int i = 0; i < m_Verts.Count; i++)
            {
                if (m_Verts[i].position.x < zero.x)
                {
                    zero.x = m_Verts[i].position.x;
                }
                if (m_Verts[i].position.y > zero.y)
                {
                    zero.y = m_Verts[i].position.y;
                }
                if (m_Verts[i].position.x > zero2.x)
                {
                    zero2.x = m_Verts[i].position.x;
                }
                if (m_Verts[i].position.y < zero2.y)
                {
                    zero2.y = m_Verts[i].position.y;
                }
            }
        }
        float num = zero2.x - zero.x;
        for (int j = 0; j < m_Verts.Count; j++)
        {
            UIVertex value = m_Verts[j];
            value.position.y += curve.Evaluate((value.position.x - zero.x) / num) * strength;
            m_Verts[j] = value;
        }
        vh.Clear();
        vh.AddUIVertexTriangleStream(m_Verts);
    }
}