Raster line (Brezanham alghorithm) AS3 implementation

/**
 *
 * Raster line (Brezanham alghorithm) AS3 implementation
 * @param c Number
 * @param x0 int
 * @param x1 int
 * @param y0 int
 * @param y1 int
 *
 * @return void
 *
 * @reference http://en.wikipedia.org/wiki/Bresenham's_line_algorithm
 *
 */
function line( x0:int, y0:int, x1:int, y1:int, c:Number=0x000460 ):void
{
    var Dx:int = x1 - x0;
    var Dy:int = y1 - y0;

    var steep:Boolean = Math.abs( Dy ) >= Math.abs( Dx );

    if( steep )
    {
        var tmp:Number = x0;
        x0 = y0;
        y0 = tmp;

        tmp = x1;
        x1  = y1;
        y1  = tmp;
        //x1^= y1 ^= x0 ^= y0

        Dx = x1 - x0;
        Dy = y1 - y0;
    }

    var xstep:int = 1;

    if( Dx < 0 )
    {
        xstep = -1;
        Dx = -Dx;
    }

    var ystep:int = 1;
    if( Dy < 0 )
    {
        ystep = -1;
        Dy = -Dy;
    }

    var TwoDy:Number = 2 * Dy;
    var TwoDyTwoDx:Number = TwoDy - 2*Dx;
    var E:int = TwoDy - Dx;

    var Y:int = y0;

    var xDraw:int;
    var yDraw:int;

    for( var X:int = x0; X != x1; X += xstep )
    {
        if ( steep )
        {

            xDraw = Y;
            yDraw = X;

        }
        else
        {
            xDraw = X;
            yDraw = Y;
        }

        plot( xDraw, yDraw, c ); //PLOT THE LINE DOT ON YOUR BITMAP DATA

        // next

        if( E > 0 )
        {
            E += TwoDyTwoDx; //E += 2*Dy - 2*Dx;
            Y = Y + ystep;
        }
        else
        {
            E += TwoDy; //E += 2*Dy;
        }
    }
}