/// <summary>
        /// Creates GUI elements for fields specific to the slider joint.
        /// </summary>
        protected void BuildGUI(SliderJoint joint)
        {
            enableLimitField.OnChanged += x =>
            {
                joint.EnableLimit = x;
                MarkAsModified();
                ConfirmModify();

                ToggleLimitFields(x);
            };

            Layout.AddElement(enableLimitField);
            limitLayout = Layout.AddLayoutX();
            {
                limitLayout.AddSpace(10);

                GUILayoutY limitContentsLayout = limitLayout.AddLayoutY();
                limitGUI = new LimitLinearRangeGUI(joint.Limit, limitContentsLayout, Persistent);
                limitGUI.OnChanged += (x, y) =>
                {
                    joint.Limit = new LimitLinearRange(x, y);

                    MarkAsModified();
                };
                limitGUI.OnConfirmed += ConfirmModify;
            }

            ToggleLimitFields(joint.EnableLimit);

            base.BuildGUI(joint, true);
        }
        private static void DrawSliderJoint(SliderJoint joint)
        {
            Vector3 anchor = GetAnchor(joint, JointBody.Anchor);
            Vector3 target = GetAnchor(joint, JointBody.Target);
            Vector3 normal = -joint.SceneObject.Right;

            if (joint.EnableLimit)
            {
                LimitLinearRange limit = joint.Limit;

                float max = MathEx.Min(10000.0f, limit.Upper);
                float min = MathEx.Clamp(limit.Lower, 0.0f, max);
                max = MathEx.Max(max, min);

                Gizmos.Color = Color.Red;
                Gizmos.DrawLine(anchor, anchor + normal*min);

                Gizmos.Color = Color.Green;
                Gizmos.DrawLine(anchor + normal*min, anchor + normal*max);
            }
            else
            {
                Gizmos.Color = Color.Green;

                float length = 100.0f;
                Gizmos.DrawLine(anchor, anchor + normal * length);
            }

            Gizmos.Color = Color.Yellow;
            Gizmos.DrawSphere(target, 0.05f);
        }
        /// <summary>
        /// Updates all GUI elements from current values in the joint.
        /// </summary>
        /// <param name="joint">Joint to update the GUI from.</param>
        protected void Refresh(SliderJoint joint)
        {
            if (enableLimitField.Value != joint.EnableLimit)
            {
                enableLimitField.Value = joint.EnableLimit;
                ToggleLimitFields(joint.EnableLimit);
            }

            limitGUI.Limit = joint.Limit;

            base.Refresh(joint);
        }