UnityEditor.AudioMixerDrawUtils.DrawGradientRectHorizontal C# (CSharp) Method

        public static void DrawGradientRectHorizontal(Rect r, Color c1, Color c2)
        {
            if (Event.current.type == EventType.Repaint)
            {
                HandleUtility.ApplyWireMaterial();
                GL.Begin(7);
                GL.Color(new Color(c1.r, c1.g, c1.b, c1.a * GetAlpha()));
                Vertex(r.x + r.width, r.y);
                Vertex(r.x + r.width, r.y + r.height);
                GL.Color(new Color(c2.r, c2.g, c2.b, c2.a * GetAlpha()));
                Vertex(r.x, r.y + r.height);
                Vertex(r.x, r.y);
                GL.End();
            }
        }