unity 渐变 文字

ColorGradientText.cs

public class ColorGradientText : BaseMeshEffect
{

    #region implemented abstract members of BaseMeshEffect
    public override void ModifyMesh(VertexHelper vh)
    {
        if (!IsActive()) { return; }
        var count = vh.currentVertCount;
        Debug.Log(count);
        if (count == 0) return;

        var vertexs = new List<UIVertex>();
        for (var i = 0; i < count; i++)
        {
            var vertex = new UIVertex();
            vh.PopulateUIVertex(ref vertex, i);
            vertexs.Add(vertex);
        }
        var topY = vertexs.Max(k => k.position.y);//[0].position.y;
        var bottomY = vertexs.Min(k => k.position.y); //[0].position.y;

        var height = topY - bottomY;
        for (var i = 0; i < count; i++)
        {
            var vertex = vertexs[i];
            vertex.color = Color32.Lerp(Color.red, Color.green, (vertex.position.y - bottomY) / height);
            vh.SetUIVertex(vertex, i);
        }
    }
    #endregion
}