void DrawWheel()

in unity/Assets/PostProcessingV2/Editor/Decorators/TrackballDecorator.cs [47:140]
73 lines of code
9 McCabe index (conditional complexity)

        void DrawWheel(ref Vector4 value, bool overrideState, TrackballAttribute attr)
        {
            var wheelRect = GUILayoutUtility.GetAspectRect(1f);
            float size = wheelRect.width;
            float hsize = size / 2f;
            float radius = 0.38f * size;

            Vector3 hsv;
            Color.RGBToHSV(value, out hsv.x, out hsv.y, out hsv.z);
            float offset = value.w;

            // Thumb
            var thumbPos = Vector2.zero;
            float theta = hsv.x * (Mathf.PI * 2f);
            thumbPos.x = Mathf.Cos(theta + (Mathf.PI / 2f));
            thumbPos.y = Mathf.Sin(theta - (Mathf.PI / 2f));
            thumbPos *= hsv.y * radius;

            // Draw the wheel
            if (Event.current.type == EventType.Repaint)
            {
                // Retina support
                float scale = EditorGUIUtility.pixelsPerPoint;

                if (s_Material == null)
                    s_Material = new Material(Shader.Find("Hidden/PostProcessing/Editor/Trackball")) { hideFlags = HideFlags.HideAndDontSave };

                // Wheel texture
            #if UNITY_2018_1_OR_NEWER
                const RenderTextureReadWrite kReadWrite = RenderTextureReadWrite.sRGB;
            #else
                const RenderTextureReadWrite kReadWrite = RenderTextureReadWrite.Linear;
            #endif

                var oldRT = RenderTexture.active;
                var rt = RenderTexture.GetTemporary((int)(size * scale), (int)(size * scale), 0, RenderTextureFormat.ARGB32, kReadWrite);
                s_Material.SetFloat("_Offset", offset);
                s_Material.SetFloat("_DisabledState", overrideState ? 1f : 0.5f);
                s_Material.SetVector("_Resolution", new Vector2(size * scale, size * scale / 2f));
                Graphics.Blit(null, rt, s_Material, EditorGUIUtility.isProSkin ? 0 : 1);
                RenderTexture.active = oldRT;

                GUI.DrawTexture(wheelRect, rt);
                RenderTexture.ReleaseTemporary(rt);

                var thumbSize = Styling.wheelThumbSize;
                var thumbSizeH = thumbSize / 2f;
                Styling.wheelThumb.Draw(new Rect(wheelRect.x + hsize + thumbPos.x - thumbSizeH.x, wheelRect.y + hsize + thumbPos.y - thumbSizeH.y, thumbSize.x, thumbSize.y), false, false, false, false);
            }

            // Input
            var bounds = wheelRect;
            bounds.x += hsize - radius;
            bounds.y += hsize - radius;
            bounds.width = bounds.height = radius * 2f;
            hsv = GetInput(bounds, hsv, thumbPos, radius);
            value = Color.HSVToRGB(hsv.x, hsv.y, 1f);
            value.w = offset;

            // Offset
            var sliderRect = GUILayoutUtility.GetRect(1f, 17f);
            float padding = sliderRect.width * 0.05f; // 5% padding
            sliderRect.xMin += padding;
            sliderRect.xMax -= padding;
            value.w = GUI.HorizontalSlider(sliderRect, value.w, -1f, 1f);

            if (attr.mode == TrackballAttribute.Mode.None)
                return;

            // Values
            var displayValue = Vector3.zero;

            switch (attr.mode)
            {
                case TrackballAttribute.Mode.Lift: displayValue = ColorUtilities.ColorToLift(value);
                    break;
                case TrackballAttribute.Mode.Gamma: displayValue = ColorUtilities.ColorToInverseGamma(value);
                    break;
                case TrackballAttribute.Mode.Gain: displayValue = ColorUtilities.ColorToGain(value);
                    break;
            }

            using (new EditorGUI.DisabledGroupScope(true))
            {
                var valuesRect = GUILayoutUtility.GetRect(1f, 17f);
                valuesRect.width /= 3f;
                GUI.Label(valuesRect, displayValue.x.ToString("F2"), EditorStyles.centeredGreyMiniLabel);
                valuesRect.x += valuesRect.width;
                GUI.Label(valuesRect, displayValue.y.ToString("F2"), EditorStyles.centeredGreyMiniLabel);
                valuesRect.x += valuesRect.width;
                GUI.Label(valuesRect, displayValue.z.ToString("F2"), EditorStyles.centeredGreyMiniLabel);
                valuesRect.x += valuesRect.width;
            }
        }