File indexing completed on 2024-06-16 04:35:04

 /*
     SPDX-FileCopyrightText: 2005 Casper Boemann <cbr@boemann.dk>
     SPDX-FileCopyrightText: 2009 Dmitry Kazakov <dimula73@gmail.com>
 
     SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
 
 #pragma once
 
 // Qt includes.
 
 #include <QWidget>
 
 #include "../abstractcurvewidget.h"
 #include "kis_cubic_curve.h"
 
 class QMouseEvent;
 class QPaintEvent;
 
 
 /**
  * KisCurveWidget is a widget that shows a single curve that can be edited
  * by the user. The user can grab the curve and move it; this creates
  * a new control point. Control points can be deleted by selecting a point
  * and pressing the delete key.
  *
  * (From: http://techbase.kde.org/Projects/Widgets_and_Classes#KisCurveWidget)
  * KisCurveWidget allows editing of spline based y=f(x) curves. Handy for cases
  * where you want the user to control such things as tablet pressure
  * response, color transformations, acceleration by time, aeroplane lift
  *by angle of attack.
  */
 class KisCurveWidget : public AbstractCurveWidget<KisCubicCurve>
 {
     Q_OBJECT
 
 public:
     using Point_t = QPointF;
 
     /**
      * Create a new curve widget with a default curve, that is a straight
      * line from bottom-left to top-right.
      */
     explicit KisCurveWidget(QWidget *parent = nullptr);
 
     ~KisCurveWidget() override;
 
     QSize sizeHint() const override;
 
 protected:
     void paintEvent(QPaintEvent *) override;
     void mousePressEvent(QMouseEvent *e) override;
     void mouseMoveEvent(QMouseEvent *e) override;
 
 public:
     /**
      * Handy function that creates new point in the middle
      * of the curve and sets focus on the m_intIn field,
      * so the user can move this point anywhere in a moment
      */
     void addPointInTheMiddle();
 
     void setCurve(KisCubicCurve &&curve);
 
     QList<QPointF> getPoints() const override;
 
 private:
     double io2sp(int x) const;
     int sp2io(double x) const;
     bool jumpOverExistingPoints(QPointF &pt, int skipIndex);
     int nearestPointInRange(QPointF pt, int wWidth, int wHeight) const;
 
     /* Dragging variables */
     double m_grabOffsetX;
     double m_grabOffsetY;
     double m_grabOriginalX;
     double m_grabOriginalY;
     QPointF m_draggedAwayPoint;
     int m_draggedAwayPointIndex;
 
     bool m_guideVisible;
     QColor m_colorGuide;
 };