/*
Warp Drive jQuery plugin
Version: 1.0.0

Written by Niklas Knaack

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

( function() {

    function WarpDrive( element, params ) {
        
        var settings = {};
            settings.width = 480;
            settings.height = 480;
            settings.autoResize = false;
            settings.autoResizeMinWidth = null;
            settings.autoResizeMaxWidth = null;
            settings.autoResizeMinHeight = null;
            settings.autoResizeMaxHeight = null;
            settings.addMouseControls = true;
            settings.addTouchControls = true;
            settings.hideContextMenu = true;
            settings.starCount = 6666;
            settings.starBgCount = 2222;
            settings.starBgColor = { r:255, g:255, b:255 };
            settings.starBgColorRangeMin = 10;
            settings.starBgColorRangeMax = 40;
            settings.starColor = { r:255, g:255, b:255 };
            settings.starColorRangeMin = 10;
            settings.starColorRangeMax = 100;
            settings.starfieldBackgroundColor = { r:0, g:0, b:0 };
            settings.starDirection = 1;
            settings.starSpeed = 20;
            settings.starSpeedMax = 200;
            settings.starSpeedAnimationDuration = 2;
            settings.starFov = 300;
            settings.starFovMin = 200;
            settings.starFovAnimationDuration =  2;
            settings.starRotationPermission = true;
            settings.starRotationDirection = 1;
            settings.starRotationSpeed = 0.0;
            settings.starRotationSpeedMax = 1.0;
            settings.starRotationAnimationDuration = 2;
            settings.starWarpLineLength = 2.0;
            settings.starWarpTunnelDiameter = 100;
            settings.starFollowMouseSensitivity = 0.025;
            settings.starFollowMouseXAxis = true;
            settings.starFollowMouseYAxis = true;
            
        //---

        if ( params !== undefined ) {

            for ( var prop in params ) {

                if ( params.hasOwnProperty( prop ) && settings.hasOwnProperty( prop ) ) {

                    settings[ prop ] = params[ prop ];

                }

            }

        }

        //---

        for ( var prop in settings ) {

            if ( settings.hasOwnProperty( prop ) && prop.indexOf( 'Duration' ) > -1 ) {

                settings[ prop ] = settings[ prop ] * 60;

            }

        }

        if ( typeof settings.starBgColor === 'string' && settings.starBgColor.indexOf( '#' ) > -1 ) {

            settings.starBgColor = hexToRgb( settings.starBgColor );

        } else if ( typeof settings.starBgColor === 'string' && settings.starBgColor.indexOf( 'rgb' ) > -1 ) {

            settings.starBgColor = parseRGBString( settings.starBgColor );

        }

        if ( typeof settings.starColor === 'string' && settings.starColor.indexOf( '#' ) > -1 ) {

            settings.starColor = hexToRgb( settings.starColor );

        } else if ( typeof settings.starColor === 'string' && settings.starColor.indexOf( 'rgb' ) > -1 ) {

            settings.starColor = parseRGBString( settings.starColor );

        }

        if ( typeof settings.starfieldBackgroundColor === 'string' && settings.starfieldBackgroundColor.indexOf( '#' ) > -1 ) {

            settings.starfieldBackgroundColor = hexToRgb( settings.starfieldBackgroundColor );

        } else if ( typeof settings.starfieldBackgroundColor === 'string' && settings.starfieldBackgroundColor.indexOf( 'rgb' ) > -1 ) {

            settings.starfieldBackgroundColor = parseRGBString( settings.starfieldBackgroundColor );

        }

        if ( !element ) {

            throw Error( '\n' + 'No div element found' );

        }

        //---

        var MATHPI180 = Math.PI / 180;
        var MATHPI2 = Math.PI * 2;

        var canvasWidth = settings.width;
        var canvasHeight = settings.height;

        var starCount = settings.starCount;
        var starBgCount = settings.starBgCount;

        var starBgColor = settings.starBgColor;
        var starBgColorRangeMin = settings.starBgColorRangeMin
        var starBgColorRangeMax = settings.starBgColorRangeMax
        var starColor = settings.starColor;
        var starColorRangeMin = settings.starColorRangeMin;
        var starColorRangeMax = settings.starColorRangeMax;

        var starfieldBackgroundColor = settings.starfieldBackgroundColor;

        var starDirection = settings.starDirection;

        var starSpeed = settings.starSpeed;
        var starSpeedMin = starSpeed;
        var starSpeedMax = settings.starSpeedMax;
        var starSpeedAnimationDuration = settings.starFovAnimationDuration;
        var starSpeedAnimationTime = 0;

        var starFov = settings.starFov;
        var starFovMin = settings.starFovMin;
        var starFovMax = starFov;
        var starFovAnimationDuration =  settings.starFovAnimationDuration;
        var starFovAnimationTime = starFovAnimationDuration;

        var starRotation = 0.0;
        var starRotationPermission = settings.starRotationPermission;
        var starRotationDirection = settings.starRotationDirection;
        var starRotationSpeed = settings.starRotationSpeed;
        var starRotationSpeedMin = starRotationSpeed;
        var starRotationSpeedMax = settings.starRotationSpeedMax;
        var starRotationAnimationDuration = settings.starRotationAnimationDuration;
        var starRotationAnimationTime = 0;
        
        var starWarpLineLength = settings.starWarpLineLength;
        var starWarpTunnelDiameter = settings.starWarpTunnelDiameter;
        var starFollowMouseSensitivity = settings.starFollowMouseSensitivity;
        var starFollowMouseXAxis = settings.starFollowMouseXAxis;
        var starFollowMouseYAxis = settings.starFollowMouseYAxis;
        var starDistance = 8000;

        var starBorderFront = -starFovMin + 1;
        var starBorderBack = starDistance;

        var starHolder;
        var starBgHolder;
        var starColorLookupTable;
        var starBgColorLookupTable;

        var canvas, ctx, imageData, pix;

        var center;

        var mouseActive;
        var mouseDown;
        var mousePos;

        var paused = false;
        
        //---

        function init() {

            canvas = document.createElement( 'canvas' );
            canvas.style.backgroundColor = rgbToHex( starfieldBackgroundColor.r, starfieldBackgroundColor.g, starfieldBackgroundColor.b );
            canvas.setAttribute( 'width', canvasWidth );
            canvas.setAttribute( 'height', canvasHeight );

            if ( settings.addMouseControls ) {

                canvas.addEventListener( 'mousemove', mouseMoveHandler, false );
                canvas.addEventListener( 'mousedown', mouseDownHandler, false );
                canvas.addEventListener( 'mouseup', mouseUpHandler, false );
                canvas.addEventListener( 'mouseenter', mouseEnterHandler, false ); 
                canvas.addEventListener( 'mouseleave', mouseLeaveHandler, false ); 

            }

            if ( settings.addTouchControls ) {

                canvas.addEventListener( 'touchstart', touchStartHandler, false );
                canvas.addEventListener( 'touchend', touchEndHandler, false );
                canvas.addEventListener( 'touchmove', touchMoveHandler, false );
                canvas.addEventListener( 'touchcancel', touchCancelHandler, false );

            }

            if ( settings.hideContextMenu ) {

                canvas.oncontextmenu = function( e ) {

                    e.preventDefault();

                };

            }

            element.appendChild( canvas );

            //---

            ctx = canvas.getContext( '2d' );
            imageData = ctx.getImageData( 0, 0, canvasWidth, canvasHeight );
            pix = imageData.data;

            //---

            center = { x:canvas.width / 2, y:canvas.height / 2 };

            mouseActive = false;
            mouseDown = false;
            mousePos = { x:center.x, y:center.y };

            //---

            starColorLookupTable = [];
            starBgColorLookupTable = [];
            starHolder = [];
            starBgHolder = [];

            addColorLookupTable( starColorLookupTable, starColorRangeMin, starColorRangeMax, starfieldBackgroundColor, starColor );
            addColorLookupTable( starBgColorLookupTable, starBgColorRangeMin, starBgColorRangeMax, starfieldBackgroundColor, starBgColor );
            addStars();
            animloop();

            //---

            if ( settings.autoResize ) {

                window.addEventListener( 'resize', resizeHandler );

                resize();

            }

        };

        //---

        Math.easeInQuad = function( t, b, c, d ) {

            return c * t * t / ( d * d ) + b;

        };

        Math.easeOutQuad = function( t, b, c, d ) {

            return -c * t * t / ( d * d ) + 2 * c * t / d + b;

        };

        //---
        //http://stackoverflow.com/questions/5560248/programmatically-lighten-or-darken-a-hex-color-or-rgb-and-blend-colors

        function shadeBlend( p, c0, c1 ) {

            var n = p < 0 ? p * -1 : p, u = Math.round, w = parseInt;
            var f = w( c0.slice( 1 ), 16 ), t = w( ( c1 ? c1 : p < 0 ? '#000000' : '#FFFFFF' ).slice( 1 ), 16 ), R1 = f >> 16, G1 = f >> 8 & 0x00FF, B1 = f & 0x0000FF;

            return '#' + ( 0x1000000 + ( u ( ( ( t >> 16 ) - R1 ) * n ) + R1 ) * 0x10000 + ( u ( ( ( t >> 8 & 0x00FF ) - G1 ) * n ) + G1 ) * 0x100 + ( u ( ( ( t & 0x0000FF ) - B1 ) * n ) + B1 ) ).toString( 16 ).slice( 1 );

        };

        //---
        //http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb

        function hexToRgb( hex ) {

            var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;

            hex = hex.replace( shorthandRegex, function( m, r, g, b ) {

                return r + r + g + g + b + b;

            } );

            var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec( hex );

            return result ? {

                r: parseInt( result[ 1 ], 16 ),
                g: parseInt( result[ 2 ], 16 ),
                b: parseInt( result[ 3 ], 16 )

            } : null;

        };

        function rgbToHex( r, g, b ) {

            var rgb = b | ( g << 8 ) | ( r << 16 );

            return '#' + ( 0x1000000 + rgb ).toString( 16 ).slice( 1 );

        };

        //---

        function parseRGBString( rgbString ) {

            rgbString = rgbString.replace( /\s+/g, '' );

            var rgbValues = rgbString.split( '(' )[ 1 ].split( ')' )[ 0 ].split( ',' );

            return { r:rgbValues[ 0 ], g:rgbValues[ 1 ], b:rgbValues[ 2 ] };

        }

        //---

        function clearImageData() {

            for ( var i = 0, l = pix.length; i < l; i += 4 ) {

                pix[ i ]     = starfieldBackgroundColor.r;
                pix[ i + 1 ] = starfieldBackgroundColor.g;
                pix[ i + 2 ] = starfieldBackgroundColor.b;
                pix[ i + 3 ] = 0;

            }

        };

        function setPixelAdditive( x, y, r, g, b, a ) {

            var i = ( x + y * canvasWidth ) * 4;

            pix[ i ]     = pix[ i ]     + r;
            pix[ i + 1 ] = pix[ i + 1 ] + g;
            pix[ i + 2 ] = pix[ i + 2 ] + b;
            pix[ i + 3 ] = a;
            
        };

        //---

        function drawLine( x1, y1, x2, y2, r, g, b, a ) {

            var dx = Math.abs( x2 - x1 );
            var dy = Math.abs( y2 - y1 );

            var sx = ( x1 < x2 ) ? 1 : -1;
            var sy = ( y1 < y2 ) ? 1 : -1;

            var err = dx - dy;

            var lx = x1;
            var ly = y1;    
            
            while ( true ) {

                if ( lx > -1 && lx < canvasWidth && ly > -1 && ly < canvasHeight ) {

                    setPixelAdditive( lx, ly, r, g, b, a );

                }

                if ( ( lx === x2 ) && ( ly === y2 ) )
                    break;

                var e2 = 2 * err;

                if ( e2 > -dx ) { 

                    err -= dy; 
                    lx += sx; 

                }

                if ( e2 < dy ) { 

                    err += dx; 
                    ly += sy; 

                }

            }

        };

        //---

        function addColorLookupTable( colorLookupTable, colorRangeMin, colorRangeMax, colorRGBStart, colorRGBEnd ) {

            var colorHexStart = rgbToHex( colorRGBStart.r, colorRGBStart.g, colorRGBStart.b );
            var colorHexEnd   = rgbToHex( colorRGBEnd.r, colorRGBEnd.g, colorRGBEnd.b );

            var colorRange = [];
            var colorEndValues = [];

            var percent;

            var i, l, j, k;

            for ( i = 0, l = 100; i <= l; i++ ) {

                percent = i / 100;

                colorRange.push( shadeBlend( percent, colorHexStart, colorHexEnd ) );

            }

            for ( i = 0, l = colorRangeMax - colorRangeMin; i <= l; i++ ) {

                var index = i + colorRangeMin;

                colorEndValues.push( colorRange[ index ] );

            }

            for ( i = 0, l = colorEndValues.length; i < l; i++ ) {

                colorRange = [];

                for ( j = 0, k = 100; j <= k; j++ ) {

                    percent = j / 100;

                    colorRange.push( hexToRgb( shadeBlend( percent, colorHexStart, colorEndValues[ i ] ) ) );


                }

                colorLookupTable.push( colorRange );

            }

        };
        
        //---

        function getStarPosition( radius, sideLength ) {

            var x = Math.random() * sideLength - ( sideLength / 2 );
            var y = Math.random() * sideLength - ( sideLength / 2 );

            if ( radius > 0 ) {

                while ( Math.sqrt( x * x + y * y ) < radius ) {

                    x = Math.random() * sideLength - ( sideLength / 2 );
                    y = Math.random() * sideLength - ( sideLength / 2 );

                }

            }

            return { x:x, y:y };

        };

        function addStar( x, y, z, ox, oy, oz ) {

            var star = {};
                star.x = x;
                star.y = y;
                star.z = z;
                star.ox = ox;
                star.oy = oy;
                star.x2d = 0;
                star.y2d = 0;
          
            return star;

        };

        function addStars() {

            var i;

            var x, y, z;

            var star, starPosition;

            for ( i = 0; i < starBgCount; i++ ) {

                starPosition = getStarPosition( 0, 20000 );

                x = starPosition.x;
                y = starPosition.y;
                z = Math.round( Math.random() * starDistance );

                star = addStar( x, y, z, x, y, z );
                star.colorIndex = Math.floor( Math.random() * starBgColorLookupTable.length );
                star.colorLookupTable = starBgColorLookupTable[ star.colorIndex ];
                star.color = star.colorLookupTable[ Math.floor( Math.random() * 100 ) ];

                starBgHolder.push( star );

            }

            for ( i = 0; i < starCount; i++ ) {

                starPosition = getStarPosition( starWarpTunnelDiameter, 10000 );

                x = starPosition.x;
                y = starPosition.y;
                z = Math.round( Math.random() * starDistance );

                star = addStar( x, y, z, x, y, z );
                star.distance = starDistance - z;
                star.distanceTotal = Math.round( starDistance + starFov );
                star.colorIndex = Math.floor( Math.random() * starColorLookupTable.length );
                star.colorLookupTable = starColorLookupTable[ star.colorIndex ];
                star.color = star.colorLookupTable[ Math.floor( ( star.distance / star.distanceTotal ) * 100 ) ];

                starHolder.push( star );

            }

        };

        //---

        window.requestAnimFrame = ( function() {

            return  window.requestAnimationFrame       ||
                    window.webkitRequestAnimationFrame ||
                    window.mozRequestAnimationFrame    ||
                    function( callback ) {
                        window.setTimeout( callback, 1000 / 60 );
                    };

        } )();

        function animloop() {

            requestAnimFrame( animloop );

            if ( !paused ) {

                render();

            }

        };

        //---

        function render() {

            clearImageData();

            //---

            var i, j, l, k, m, n;

            //---

            var star;
            var scale;

            //---

            if ( starRotationPermission ) {

                if ( mouseDown ) {

                    starRotationAnimationTime += 1;

                    if ( starRotationAnimationTime > starRotationAnimationDuration )
                        starRotationAnimationTime = starRotationAnimationDuration;

                } else {

                    starRotationAnimationTime -= 1;

                    if ( starRotationAnimationTime < 0 )
                        starRotationAnimationTime = 0;

                }

                starRotationSpeed = Math.easeOutQuad( starRotationAnimationTime, starRotationSpeedMin, starRotationSpeedMax, starRotationAnimationDuration );
                starRotation -= starRotationSpeed * starRotationDirection;
                
            }

            //---
            
            if ( mouseActive ) {

                starSpeedAnimationTime += 1;

                if ( starSpeedAnimationTime > starSpeedAnimationDuration )
                    starSpeedAnimationTime = starSpeedAnimationDuration;

                starFovAnimationTime -= 1;

                if ( starFovAnimationTime < 0 )
                    starFovAnimationTime = 0;

                //---

                if ( starFollowMouseXAxis ) {

                    center.x += ( mousePos.x - center.x ) * starFollowMouseSensitivity;

                }

                if ( starFollowMouseYAxis ) {

                    center.y += ( mousePos.y - center.y ) * starFollowMouseSensitivity;

                }

            } else {

                starSpeedAnimationTime -= 1;

                if ( starSpeedAnimationTime < 0 )
                    starSpeedAnimationTime = 0;

                starFovAnimationTime += 1;

                if ( starFovAnimationTime > starFovAnimationDuration )
                    starFovAnimationTime = starFovAnimationDuration;

                //---

                if ( starFollowMouseXAxis ) {

                    center.x += ( ( canvas.width / 2 ) - center.x ) * starFollowMouseSensitivity;

                }

                if ( starFollowMouseYAxis ) {

                    center.y += ( ( canvas.height / 2 ) - center.y ) * starFollowMouseSensitivity;

                }

            }

            starSpeed = Math.easeOutQuad( starSpeedAnimationTime, 0, starSpeedMax - starSpeedMin, starSpeedAnimationDuration ) + starSpeedMin;
            starFov = Math.easeInQuad( starFovAnimationTime, 0, starFovMax - starFovMin, starFovAnimationDuration ) + starFovMin;

            //---

            starBorderFront = -starFov + 1;

            //---

            var warpSpeedValue = starSpeed * ( starSpeed / ( starSpeedMax / starWarpLineLength ) );

            //---
            //stars bg

            for ( i = 0, l = starBgHolder.length; i < l; i++ ) {

                star = starBgHolder[ i ];

                scale = starFov / ( starFov + star.z ); 
                
                star.x2d = ( star.x * scale ) + center.x; 
                star.y2d = ( star.y * scale ) + center.y; 

                if ( star.x2d > -1 && star.x2d < canvasWidth && star.y2d > -1 && star.y2d < canvasHeight ) {

                    setPixelAdditive( star.x2d | 0, star.y2d | 0, star.color.r, star.color.g, star.color.b, 255 );

                }

            }
            
            //---
            //stars moving

            for ( i = 0, l = starHolder.length; i < l; i++ ) {

                star = starHolder[ i ];

                //---
                //star distance calc

                star.distanceTotal = Math.round( starDistance + starFov );

                //---
                //star movement

                if ( starDirection >= 0 ) {

                    star.z -= starSpeed;
                    star.distance += starSpeed;

                    if ( star.z < starBorderFront ) {

                        star.z = starBorderBack;
                        star.distance = 0;

                    }  

                } else {

                    star.z += starSpeed;
                    star.distance -= starSpeed;

                    if ( star.z > starBorderBack ) {

                        star.z = starBorderFront;
                        star.distance = star.distanceTotal;

                    }

                }

                //---
                //star color

                star.color = star.colorLookupTable[ Math.floor( ( star.distance / star.distanceTotal ) * 100 ) ];

                //---
                //star position & draw
                
                scale = starFov / ( starFov + star.z ); 
                
                star.x2d = ( star.x * scale ) + center.x; 
                star.y2d = ( star.y * scale ) + center.y; 

                if ( starSpeed === starSpeedMin ) {

                    if ( star.x2d > -1 && star.x2d < canvasWidth && star.y2d > -1 && star.y2d < canvasHeight ) {

                        setPixelAdditive( star.x2d | 0, star.y2d | 0, star.color.r, star.color.g, star.color.b, 255 );

                    }

                } else {

                    var nz = star.z + warpSpeedValue;

                    scale = starFov / ( starFov + nz ); 

                    var x2d = ( star.x * scale ) + center.x; 
                    var y2d = ( star.y * scale ) + center.y; 

                    if ( x2d > -1 && x2d < canvasWidth && y2d > -1 && y2d < canvasHeight ) {

                        drawLine( star.x2d | 0, star.y2d | 0, x2d | 0, y2d | 0, star.color.r, star.color.g, star.color.b, 255 );

                    }

                }

                //---
                //star rotation

                if ( starRotationSpeed !== starRotationSpeedMin ) {

                    var radians = MATHPI180 * starRotation;

                    var cos = Math.cos( radians );
                    var sin = Math.sin( radians );

                    star.x = cos * star.ox + sin * star.oy;
                    star.y = cos * star.oy - sin * star.ox;

                }
  
            }

            //---

            ctx.putImageData( imageData, 0, 0 );

        };

        function resizeHandler( event ) {

            resize();

        };

        function resize() {

            canvasWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
            canvasHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;

            if ( settings.autoResizeMinWidth && canvasWidth < settings.autoResizeMinWidth ) {

                canvasWidth = settings.autoResizeMinWidth;

            } else if ( settings.autoResizeMaxWidth && canvasWidth > settings.autoResizeMaxWidth ) {

                canvasWidth = settings.autoResizeMaxWidth;

            }

            if ( settings.autoResizeMinHeight && canvasHeight < settings.autoResizeMinHeight ) {

                canvasHeight = settings.autoResizeMinHeight;

            } else if ( settings.autoResizeMaxHeight && canvasHeight > settings.autoResizeMaxHeight ) {

                canvasHeight = settings.autoResizeMaxHeight;

            }

            //---

            canvas.setAttribute( 'width', canvasWidth );
            canvas.setAttribute( 'height', canvasHeight );

            center = { x:canvas.width / 2, y:canvas.height / 2 };

            //---

            imageData = ctx.getImageData( 0, 0, canvasWidth, canvasHeight );
            pix = imageData.data;

        };

        //---

        function mouseMoveHandler( event ) {

            mousePos = getMousePos( canvas, event );

        };

        function mouseEnterHandler( event ) {

            mouseActive = true;

        };

        function mouseLeaveHandler( event ) {

            mouseActive = false;
            mouseDown = false;

        };

        function mouseDownHandler( event ) {

            mouseDown = true;

        };

        function mouseUpHandler( event ) {

            mouseDown = false;

        };

        //---

        function getMousePos( canvas, event ) {

            var rect = canvas.getBoundingClientRect();
            
            return { x: event.clientX - rect.left, y: event.clientY - rect.top };

        };

        //---

        function touchStartHandler( event ) {

            event.preventDefault();

            mouseDown = true;
            mouseActive = true;

        };

        function touchEndHandler( event ) {

            event.preventDefault();

            mouseDown = false;
            mouseActive = false;

        };

        function touchMoveHandler( event ) {

            event.preventDefault();

            mousePos = getTouchPos( canvas, event );

        };

        function touchCancelHandler( event ) {

            mouseDown = false;
            mouseActive = false;

        };

        //---

        function getTouchPos( canvas, event ) {

            var rect = canvas.getBoundingClientRect();

            return { x: event.touches[ 0 ].clientX - rect.left, y: event.touches[ 0 ].clientY - rect.top };

        };

        //---

        this.pause = function() {

            paused = true;

        };

        this.unpause = function() {

            paused = false;

        };

        //---
        
        init();

    };

    window.WarpDrive = WarpDrive;

} () );

if ( typeof jQuery !== 'undefined' ) {

    ( function( $ ) {

        $.fn.warpDrive = function( params ) {

            var args = arguments;

            return this.each( function() {

                if ( !$.data( this, 'plugin_WarpDrive' ) ) {

                    $.data( this, 'plugin_WarpDrive', new WarpDrive( this, params ) );

                } else {

                    var plugin = $.data( this, 'plugin_WarpDrive' );

                    if ( plugin[ params ] ) {

                        plugin[ params ].apply( this, Array.prototype.slice.call( args, 1 ) );

                    } else {

                        $.error( 'Method ' +  params + ' does not exist on jQuery.warpDrive' );

                    }

                }

            } );

        };
        
    } ( jQuery ) );

}