InertiaExpansionBehavior.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / InertiaExpansionBehavior.cs / 1305600 / InertiaExpansionBehavior.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Diagnostics; 
using System.Windows;
using System.Windows.Input.Manipulations; 

namespace System.Windows.Input
{
    ///  
    ///     Provides information about the inertia behavior.
    ///  
    public class InertiaExpansionBehavior 
    {
        ///  
        ///     Instantiates a new instance of this class.
        /// 
        public InertiaExpansionBehavior()
        { 
        }
 
        ///  
        ///     Instantiates a new instance of this class.
        ///  
        internal InertiaExpansionBehavior(Vector initialVelocity)
        {
            _initialVelocity = initialVelocity;
        } 

        ///  
        ///     The initial rate of change of size of the element at the start of the inertia phase. 
        /// 
        public Vector InitialVelocity 
        {
            get { return _initialVelocity; }
            set
            { 
                _isInitialVelocitySet = true;
                _initialVelocity = value; 
            } 
        }
 
        /// 
        ///     The desired rate of change of velocity.
        /// 
        public double DesiredDeceleration 
        {
            get { return _desiredDeceleration; } 
            set 
            {
                if (Double.IsInfinity(value) || Double.IsNaN(value)) 
                {
                    throw new ArgumentOutOfRangeException("value");
                }
 
                _isDesiredDecelerationSet = true;
                _desiredDeceleration = value; 
                _isDesiredExpansionSet = false; 
                _desiredExpansion = new Vector(double.NaN, double.NaN);
            } 
        }

        /// 
        ///     The desired total change in size. 
        /// 
        public Vector DesiredExpansion 
        { 
            get { return _desiredExpansion; }
            set 
            {
                _isDesiredExpansionSet = true;
                _desiredExpansion = value;
                _isDesiredDecelerationSet = false; 
                _desiredDeceleration = double.NaN;
            } 
        } 

        public double InitialRadius 
        {
            get { return _initialRadius; }
            set
            { 
                _isInitialRadiusSet = true;
                _initialRadius = value; 
            } 
        }
 
        internal bool CanUseForInertia()
        {
            return _isInitialVelocitySet || _isInitialRadiusSet || _isDesiredDecelerationSet || _isDesiredExpansionSet;
        } 

        internal static void ApplyParameters(InertiaExpansionBehavior behavior, InertiaProcessor2D processor, Vector initialVelocity) 
        { 
            if (behavior != null && behavior.CanUseForInertia())
            { 
                InertiaExpansionBehavior2D behavior2D = new InertiaExpansionBehavior2D();
                if (behavior._isInitialVelocitySet)
                {
                    behavior2D.InitialVelocityX = (float)behavior._initialVelocity.X; 
                    behavior2D.InitialVelocityY = (float)behavior._initialVelocity.Y;
                } 
                else 
                {
                    behavior2D.InitialVelocityX = (float)initialVelocity.X; 
                    behavior2D.InitialVelocityY = (float)initialVelocity.Y;
                }
                if (behavior._isDesiredDecelerationSet)
                { 
                    behavior2D.DesiredDeceleration = (float)behavior._desiredDeceleration;
                } 
                if (behavior._isDesiredExpansionSet) 
                {
                    behavior2D.DesiredExpansionX = (float)behavior._desiredExpansion.X; 
                    behavior2D.DesiredExpansionY = (float)behavior._desiredExpansion.Y;
                }
                if (behavior._isInitialRadiusSet)
                { 
                    behavior2D.InitialRadius = (float)behavior._initialRadius;
                } 
 
                processor.ExpansionBehavior = behavior2D;
            } 
        }

        private bool _isInitialVelocitySet;
        private Vector _initialVelocity = new Vector(double.NaN, double.NaN); 
        private bool _isDesiredDecelerationSet;
        private double _desiredDeceleration = double.NaN; 
        private bool _isDesiredExpansionSet; 
        private Vector _desiredExpansion = new Vector(double.NaN, double.NaN);
        private bool _isInitialRadiusSet; 
        private double _initialRadius = 1.0;
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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