ExponentialEase.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 / Media / Animation / ExponentialEase.cs / 1305600 / ExponentialEase.cs
                        

                        
                            //------------------------------------------------------------------------------ 
//  Copyright (c) Microsoft Corporation, 2008
//
//  File: ExponentialEase.cs
//----------------------------------------------------------------------------- 

using MS.Internal; 
 
namespace System.Windows.Media.Animation
{ 
    /// 
    ///     This class implements an easing function that gives an exponential curve
    /// 
    public class ExponentialEase : EasingFunctionBase 
    {
        public ExponentialEase() 
        { 

        } 

        /// 
        /// Factor Property
        ///  
        public static readonly DependencyProperty ExponentProperty =
            DependencyProperty.Register( 
                    "Exponent", 
                    typeof(double),
                    typeof(ExponentialEase), 
                    new PropertyMetadata(2.0));

        /// 
        /// Specifies the factor which controls the shape of easing. 
        /// 
        public double Exponent 
        { 
            get
            { 
                return (double)GetValue(ExponentProperty);
            }
            set
            { 
                SetValueInternal(ExponentProperty, value);
            } 
        } 

        protected override double EaseInCore(double normalizedTime) 
        {
            double factor = Exponent;
            if (DoubleUtil.IsZero(factor))
            { 
                return normalizedTime;
            } 
            else 
            {
                return (Math.Exp(factor * normalizedTime) - 1.0) / (Math.Exp(factor) - 1.0); 
            }
        }

        protected override Freezable CreateInstanceCore() 
        {
            return new ExponentialEase(); 
        } 
    }
} 

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

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