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define( [
        "../core",
        "../css"
], function( jQuery ) {

"use strict";

function Tween( elem, options, prop, end, easing ) {
        return new Tween.prototype.init( elem, options, prop, end, easing );
}
jQuery.Tween = Tween;

Tween.prototype = {
        constructor: Tween,
        init: function( elem, options, prop, end, easing, unit ) {
                this.elem = elem;
                this.prop = prop;
                this.easing = easing || jQuery.easing._default;
                this.options = options;
                this.start = this.now = this.cur();
                this.end = end;
                this.unit = unit || ( jQuery.cssNumber[ prop ] ? "" : "px" );
        },
        cur: function() {
                var hooks = Tween.propHooks[ this.prop ];

                return hooks && hooks.get ?
                        hooks.get( this ) :
                        Tween.propHooks._default.get( this );
        },
        run: function( percent ) {
                var eased,
                        hooks = Tween.propHooks[ this.prop ];

                if ( this.options.duration ) {
                        this.pos = eased = jQuery.easing[ this.easing ](
                                percent, this.options.duration * percent, 0, 1, this.options.duration
                        );
                } else {
                        this.pos = eased = percent;
                }
                this.now = ( this.end - this.start ) * eased + this.start;

                if ( this.options.step ) {
                        this.options.step.call( this.elem, this.now, this );
                }

                if ( hooks && hooks.set ) {
                        hooks.set( this );
                } else {
                        Tween.propHooks._default.set( this );
                }
                return this;
        }
};

Tween.prototype.init.prototype = Tween.prototype;

Tween.propHooks = {
        _default: {
                get: function( tween ) {
                        var result;

                        // Use a property on the element directly when it is not a DOM element,
                        // or when there is no matching style property that exists.
                        if ( tween.elem.nodeType !== 1 ||
                                tween.elem[ tween.prop ] != null && tween.elem.style[ tween.prop ] == null ) {
                                return tween.elem[ tween.prop ];
                        }

                        // Passing an empty string as a 3rd parameter to .css will automatically
                        // attempt a parseFloat and fallback to a string if the parse fails.
                        // Simple values such as "10px" are parsed to Float;
                        // complex values such as "rotate(1rad)" are returned as-is.
                        result = jQuery.css( tween.elem, tween.prop, "" );

                        // Empty strings, null, undefined and "auto" are converted to 0.
                        return !result || result === "auto" ? 0 : result;
                },
                set: function( tween ) {

                        // Use step hook for back compat.
                        // Use cssHook if its there.
                        // Use .style if available and use plain properties where available.
                        if ( jQuery.fx.step[ tween.prop ] ) {
                                jQuery.fx.step[ tween.prop ]( tween );
                        } else if ( tween.elem.nodeType === 1 &&
                                ( tween.elem.style[ jQuery.cssProps[ tween.prop ] ] != null ||
                                        jQuery.cssHooks[ tween.prop ] ) ) {
                                jQuery.style( tween.elem, tween.prop, tween.now + tween.unit );
                        } else {
                                tween.elem[ tween.prop ] = tween.now;
                        }
                }
        }
};

// Support: IE <=9 only
// Panic based approach to setting things on disconnected nodes
Tween.propHooks.scrollTop = Tween.propHooks.scrollLeft = {
        set: function( tween ) {
                if ( tween.elem.nodeType && tween.elem.parentNode ) {
                        tween.elem[ tween.prop ] = tween.now;
                }
        }
};

jQuery.easing = {
        linear: function( p ) {
                return p;
        },
        swing: function( p ) {
                return 0.5 - Math.cos( p * Math.PI ) / 2;
        },
        _default: "swing"
};

jQuery.fx = Tween.prototype.init;

// Back compat <1.8 extension point
jQuery.fx.step = {};

} );

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