colorcircle.h

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// $Id: colorcircle.h,v 1.1 2005/06/06 13:26:20 rcr_muc Exp $
// palette to choose color from
// 2005-05-22 rcr

#ifndef COLORCIRCLE_H
#define COLORCIRCLE_H

#include <qpixmap.h>
#include <qwmatrix.h>
#include <qsize.h>
#include <qframe.h>
#include <qpoint.h>

#include "rcolor.h"

class QPainter;

class ColorCircle : public QFrame
{
  Q_OBJECT

  QWMatrix wm;
  QSize palSize, frameSize;
  QPixmap cpm, tpm, bg;
  double innerRadius, outerRadius;
  double center;
  int icenter, irad, orad;
  int currentHue, currentSat, currentVal, currentAlpha;
  double circleWidth;

  void makeCircle();
  void makeTriangle( int );
  double arcTan( double, double );  // return value 0 < x < 2π
  void calcVertices( int, int*, int*, int*, int*, int*, int* );
  bool isInTriangle( int, int );
  void calcSV( int, int, int*, int* );
  void calcCoords( int*, int* );
public:
  ColorCircle( QWidget* parent = 0, const char* name = 0, WFlags f = 0 );
  ~ColorCircle();
  void setColor( const rColor& );

protected:
  void drawContents( QPainter* );
  void mouseReleaseEvent( QMouseEvent* );

signals:
  void colorChanged( const rColor& );
};

#endif // COLORCIRCLE_H

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