#include <math.h>

#include <qregexp.h>

#include <qpoint.h>

#include <stdlib.h>

#include "misc.h"

QString qpointToString (const QPoint &p)

{

	return "(" + QString("%1").arg(p.x()) +","+ QString ("%1").arg (p.y()) +")";

}

QString qpointfToString (const QPointF &p)

{

	return "(" + QString("%1").arg(p.x()) +","+ QString ("%1").arg (p.y()) +")";

}

ostream &operator<< (ostream &stream, QPoint const &p)

{ 

	stream << "("<<p.x()<<","<<p.y()<<")";

	return stream;

}

ostream &operator<< (ostream &stream, QPointF const &p)

{ 

	stream << "("<<p.x()<<","<<p.y()<<")";

	return stream;

}

qreal getAngle(const QPointF &p)

{	

	// Calculate angle of vector to y-axis

	if (p.y()==0)

	{

		if (p.x()>=0)

			return M_PI_2;

		else

			return 3* M_PI_2;

	} else

	{

		if (p.y()>0) 

			return (qreal)(M_PI  - atan ( (qreal)(p.x()) / (qreal)(p.y()) ) );

		else	

			if (p.x()<0)

				return (qreal)( 2*M_PI - atan ( (qreal)(p.x()) / (qreal)(p.y()) ) );

			else	

				return (qreal)( - atan ( (qreal)(p.x()) / (qreal)(p.y()) ) );

	}	

}

QPointF normalise(const QPointF &p)

{	

	// Calculate normalised position (fixed length) 

	qreal px=p.x();

	qreal py=p.y();

	qreal x;

	qreal y;

	qreal r=150;

	if (px==0)

	{

		x=0;

		if (py>=0)

			y=r;

		else

			y=-r;

	} else

	{

		qreal sign;

		qreal a;

		if (px>0) 

			sign=1; 

		else 

			sign=-1;

		a=atan (py / px);

		x=cos (a) * r *sign;

		y=sin (a) * r *sign;

	}	

	return QPoint ((int) (x),(int) (y));

}

// returns masked "<" ">" "&"

QString quotemeta(const QString &s)

{

	QString r=s;

    QRegExp  rx("&(?!amp;)");

    r.replace ( rx,"&");

    rx.setPattern( ">");

    r.replace ( rx,">");

    rx.setPattern( "<");

    r.replace ( rx,"<");

    rx.setPattern( "\"");

    r.replace ( rx,""");

    return r;

}

qreal max(qreal a, qreal b)

{

	if (a>b)

		return a;

	return b;

}

int xmlObj::actindent=0;		// make instance of actindent

xmlObj::xmlObj()

{

    indentwidth=4;

}

// returns <s at />

QString xmlObj::singleElement(QString s, QString at)

{

    return indent() + "<" + s +" " + at +" " + "/>\n";

}

// returns <s>

QString xmlObj::beginElement(QString s)

{

    return indent() + "<" + s + ">\n";

}

// returns <s at>

QString xmlObj::beginElement(QString s, QString at)

{

    return indent() + "<" + s + " " + at + ">\n";

}

// returns </s>

QString xmlObj::endElement(QString s)

{

    return indent() + "</" + s + ">\n";

}

// returns  at="val"

QString xmlObj::attribut(QString at, QString val)

{

    return " " + at + "=\"" + quotemeta (val) + "\""; 

}

// returns <s> val </s>

QString xmlObj::valueElement(QString el, QString val)

{

    return indent() + "<" + el + ">" + quotemeta(val) + "</" +el + ">\n";

}

// returns <s at> val </s>

QString xmlObj::valueElement(QString el, QString val, QString at)

{

    return indent() + "<" + el + " " + at + ">" + quotemeta(val) + "</" +el + ">\n";

}

void xmlObj::incIndent()

{

    actindent++;

}	

void xmlObj::decIndent()

{

    actindent--;

    if (actindent<0) actindent=0;

}	

QString xmlObj::indent()

{

    QString s;

    int i;

    for (i=0; i<actindent*indentwidth; i++)

    {

		s= s + " ";

    }

    return s;

}