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misc.cpp
author insilmaril
Wed, 05 Dec 2007 14:58:02 +0000
changeset 629 92bebad145d2
parent 617 7ee5bf3647d3
child 789 d85834ad8c54
permissions -rw-r--r--
Added files from Andrew Ng for Windows 
     1 #include <math.h>

     2 

     3 #include <qregexp.h>

     4 #include <qpoint.h>

     5 #include <stdlib.h>

     6 

     7 #include "misc.h"

     8 

     9 QString qpointToString (const QPoint &p)

    10 {

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

    12 }

    13 

    14 QString qpointfToString (const QPointF &p)

    15 {

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

    17 }

    18 

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

    20 { 

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

    22 	return stream;

    23 }

    24 

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

    26 { 

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

    28 	return stream;

    29 }

    30 

    31 qreal getAngle(const QPointF &p)

    32 {	

    33 	// Calculate angle of vector to y-axis

    34 	if (p.y()==0)

    35 	{

    36 		if (p.x()>=0)

    37 			return M_PI_2;

    38 		else

    39 			return 3* M_PI_2;

    40 	} else

    41 	{

    42 		if (p.y()>0) 

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

    44 		else	

    45 			if (p.x()<0)

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

    47 			else	

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

    49 	}	

    50 }

    51 

    52 QPointF normalise(const QPointF &p)

    53 {	

    54 	// Calculate normalised position (fixed length) 

    55 

    56 	qreal px=p.x();

    57 	qreal py=p.y();

    58 	qreal x;

    59 	qreal y;

    60 	qreal r=150;

    61 

    62 	if (px==0)

    63 	{

    64 		x=0;

    65 		if (py>=0)

    66 			y=r;

    67 		else

    68 			y=-r;

    69 	} else

    70 	{

    71 		qreal sign;

    72 		qreal a;

    73 		if (px>0) 

    74 			sign=1; 

    75 		else 

    76 			sign=-1;

    77 		

    78 		a=atan (py / px);

    79 		x=cos (a) * r *sign;

    80 		y=sin (a) * r *sign;

    81 	}	

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

    83 }

    84 

    85 

    86 qreal max(qreal a, qreal b)

    87 {

    88 	if (a>b)

    89 		return a;

    90 	return b;

    91 }

    92
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