gradwidget.h

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/**************************************************************************
 * This file is part of the Fraqtive program.
 * Copyright (C) 2005 Michal Mecinski.
 * This program is licensed under the GNU General Public License.
 **************************************************************************/
 
#ifndef GRADCONTROL_H
#define GRADCONTROL_H
 
#include "gradient.h"
 
#include <sstream>
#include <qstring.h>
#include <qwidget.h>
#include <qrect.h>

#define noDragMode 0
#define dragNodeMode 1
#define dragSegmentMode 2
 
class GradientWidget : public QWidget
{
  Q_OBJECT
    public:
  GradientWidget(QWidget* parent = 0, const char* name = 0,
                 const QString& gradString = "", double vMin = 0,
                 double vMax = 1.);
  //GradientWidget(QWidget* parent=0, const char* name=0);

  ~GradientWidget();
 
 public:
  QSize minimumSizeHint() const;

  QSize sizeHint() const;

  const Gradient& getGradient() const
    {
      return _gradient;
    }
 
  QString getGradientString() const;
  void setGradient(const QString& s);
 
  bool hasAlpha() const
  { return _hasAlpha; }
  void setHasAlpha( bool x );
  void setBounds( double vMin = 0, double vMax = 1. );
  double minBound() const { return _minVal; }
  double maxBound() const { return _maxVal; }
 
 signals:
  void gradientChanged(QString s);
 
  public slots:
  void setGradient(const Gradient& gradient);

  void newRgb();

  void newHsv();

  void invert();
 
 private:
  // process events
  void paintEvent(QPaintEvent* e);
  void resizeEvent(QResizeEvent* e);
  void mousePressEvent(QMouseEvent* e);
  void mouseReleaseEvent(QMouseEvent* e);
  void mouseMoveEvent(QMouseEvent* e);
 
  // layout the area rectangles
  void calcRects();
 
  // Make mapping between real value and x position:
  int realValToWidgetX(double v);
 
  // Retrieve colormap data compatible with matplotlib
  QString getRGBnodes();
 
 private:
  Gradient _gradient;
    
  // area rectangles
  QRect _gradRect;
  QRect _splineRect[4];
 
  // node dragging
  int _dragMode; // either noDragMode, dragNodeMode or dragSegmentMode
  int _dragSpline;
  int _dragSegLeft;
  int _dragSegRight;
  QPoint _prevMousePos;
  int _dragNode;
  bool _dragRemove;
 
  // real value mapping
  double _minVal;
  double _maxVal;
  QPoint _pointerPos;
  QString _posText;
  bool _hasAlpha;
};
 
#endif