easing.c

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class Easing
{
    static float EaseInSine( float t ) 
    {
        return -1 * Math.Cos( t * ( Math.PI / 2 ) ) + 1;
    }
 
    static float EaseOutSine( float t ) 
    {
        return Math.Sin( t * ( Math.PI / 2 ) );
    }
 
    static float EaseInOutSine( float t ) 
    {
        return -0.5 * ( Math.Cos( Math.PI * t ) - 1 );
    }
 
    static float EaseInQuad( float t ) 
    {
        return t * t;
    }
 
    static float EaseOutQuad( float t ) 
    {
        return t * ( 2 - t );
    }
 
    static float EaseInOutQuad( float t ) 
    {
        if(t < 0.5)
            return 2 * t * t;
        else 
            return -1 + ( 4 - 2 * t ) * t;
    }
 
    static float EaseInCubic( float t ) 
    {
        return t * t * t;
    }
 
    static float EaseOutCubic( float t ) 
    {
        float t1 = t - 1;
        return t1 * t1 * t1 + 1;
    }
 
    static float EaseInOutCubic( float t ) 
    {
        if( t < 0.5 ) 
            return 4 * t * t * t;
        else 
            return ( t - 1 ) * ( 2 * t - 2 ) * ( 2 * t - 2 ) + 1;
    }
 
    static float EaseInQuart( float t ) 
    {
        return t * t * t * t;
    }
 
    static float EaseOutQuart( float t ) 
    {
        float t1 = t - 1;
        return 1 - t1 * t1 * t1 * t1;
    }
 
 
    static float EaseInOutQuart( float t ) 
    {
        float t1 = t - 1;
        
        if(t < 0.5)
            return 8 * t * t * t * t;
        else
            return 1 - 8 * t1 * t1 * t1 * t1;
    }
 
    static float EaseInQuint( float t ) 
    {
        return t * t * t * t * t;
    }
 
    static float EaseOutQuint( float t ) 
    {
        float t1 = t - 1;
        return 1 + t1 * t1 * t1 * t1 * t1;
    }
 
    static float EaseInOutQuint( float t ) 
    {
        float t1 = t - 1;
        
        if( t < 0.5 )
        {
            return 16 * t * t * t * t * t;
        }
        else
        {
            return  1 + 16 * t1 * t1 * t1 * t1 * t1;
        }
    }
 
    static float EaseInExpo( float t ) 
    {
        if( t == 0 ) 
        {
            return 0;
        }
        
        return  Math.Pow( 2, 10 * ( t - 1 ) );
    }
 
    static float EaseOutExpo( float t ) 
    {
        if( t == 1 ) {
            return 1;
        }
 
        return ( -Math.Pow( 2, -10 * t ) + 1 );
    }
 
    static float EaseInOutExpo( float t ) 
    {
    
        if( t == 0 || t == 1 ) 
        {
            return t;
        }
 
        float scaledTime = t * 2;
        float scaledTime1 = scaledTime - 1;
            
        if( scaledTime < 1 ) 
        {
           return 0.5 * Math.Pow( 2, 10 *  scaledTime1 );
        }
    
        return 0.5 * ( -Math.Pow( 2, -10 * scaledTime1 ) + 2 );
 
    }
 
    static float EaseInCirc( float t ) 
    {
        float scaledTime = t / 1;
        return -1 * ( Math.Sqrt( 1 - scaledTime * t ) - 1 );
    }
 
    static float EaseOutCirc( float t ) 
    {
        float t1 = t - 1;
        return Math.Sqrt( 1 - t1 * t1 );
    }
    
    static float EaseInOutCirc( float t ) 
    {
 
        float scaledTime = t * 2;
        float scaledTime1 = scaledTime - 2;
 
        if( scaledTime < 1 ) 
        {
            return -0.5 * ( Math.Sqrt( 1 - scaledTime * scaledTime ) - 1 );
        }
 
        return 0.5 * ( Math.Sqrt( 1 - scaledTime1 * scaledTime1 ) + 1 );
    }
 
    static float EaseInBack( float t, float magnitude = 1.70158 ) 
    {
        return t * t * ( ( magnitude + 1 ) * t - magnitude );
    }
 
    static float EaseOutBack( float t, float magnitude = 1.70158 ) 
    {
        float scaledTime = ( t / 1 ) - 1;
        return (scaledTime * scaledTime * ( ( magnitude + 1 ) * scaledTime + magnitude )) + 1;
    }
 
    static float EaseInOutBack( float t, float magnitude = 1.70158 ) 
    {
 
        float scaledTime = t * 2;
        float scaledTime2 = scaledTime - 2;
 
        float s = magnitude * 1.525;
 
        if( scaledTime < 1) 
        {
            return 0.5 * scaledTime * scaledTime * (( ( s + 1 ) * scaledTime ) - s);
        }
 
        return 0.5 * (scaledTime2 * scaledTime2 * ( ( s + 1 ) * scaledTime2 + s ) + 2);
    }
 
    static float EaseInElastic( float t, float magnitude = 0.7 ) 
    {
        if( t == 0 || t == 1 ) 
            return t;
 
        float scaledTime = t / 1;
        float scaledTime1 = scaledTime - 1;
 
        float p = 1 - magnitude;
        float s = p / ( 2 * Math.PI ) * Math.Asin( 1 );
 
        return -(Math.Pow( 2, 10 * scaledTime1 ) * Math.Sin( ( scaledTime1 - s ) * ( 2 * Math.PI ) / p ));
    }
 
    static float EaseOutElastic( float t, float magnitude = 0.7 ) 
    {
        float p = 1 - magnitude;
        float scaledTime = t * 2;
 
        if( t == 0 || t == 1 ) {
            return t;
        }
 
        float s = p / ( 2 * Math.PI ) * Math.Asin( 1 );
        return (Math.Pow( 2, -10 * scaledTime ) * Math.Sin( ( scaledTime - s ) * ( 2 * Math.PI ) / p )) + 1;
    }
 
    static float EaseInOutElastic( float t, float magnitude = 0.65 ) 
    {
        float p = 1 - magnitude;
 
        if( t == 0 || t == 1 ) 
        {
            return t;
        }
 
        float scaledTime = t * 2;
        float scaledTime1 = scaledTime - 1;
        
        float s = p / ( 2 * Math.PI ) * Math.Asin( 1 );
 
        if( scaledTime < 1 ) 
        {
            return -0.5 * (Math.Pow( 2, 10 * scaledTime1 ) * Math.Sin( ( scaledTime1 - s ) * ( 2 * Math.PI ) / p ));
        }
 
        return (Math.Pow( 2, -10 * scaledTime1 ) *        Math.Sin( ( scaledTime1 - s ) * ( 2 * Math.PI ) / p ) * 0.5) + 1;
    }
 
    static float EaseOutBounce( float t ) 
    {
 
        float scaledTime = t / 1;
 
        if( scaledTime < ( 1 / 2.75 ) ) {
 
            return 7.5625 * scaledTime * scaledTime;
 
        } else if( scaledTime < ( 2 / 2.75 ) ) {
 
            float scaledTime2 = scaledTime - ( 1.5 / 2.75 );
            return ( 7.5625 * scaledTime2 * scaledTime2 ) + 0.75;
 
        } else if( scaledTime < ( 2.5 / 2.75 ) ) {
 
            scaledTime2 = scaledTime - ( 2.25 / 2.75 );
            return ( 7.5625 * scaledTime2 * scaledTime2 ) + 0.9375;
 
        } else {
 
            scaledTime2 = scaledTime - ( 2.625 / 2.75 );
            return ( 7.5625 * scaledTime2 * scaledTime2 ) + 0.984375;
 
        }
    }
 
    static float EaseInBounce( float t ) 
    {
        return 1 - EaseOutBounce( 1 - t );
    }
 
    static float EaseInOutBounce( float t ) 
    {
        if( t < 0.5 ) 
        {
            return EaseInBounce( t * 2 ) * 0.5;
        }
        return ( EaseOutBounce( ( t * 2 ) - 1 ) * 0.5 ) + 0.5;
    }
}