File indexing completed on 2024-05-26 04:32:08

 /*
  * SPDX-FileCopyrightText: 2008 Cyrille Berger <cberger@cberger.net>
  * SPDX-FileCopyrightText: 2010 Geoffry Song <goffrie@gmail.com>
  * SPDX-FileCopyrightText: 2014 Wolthera van Hövell tot Westerflier <griffinvalley@gmail.com>
  * SPDX-FileCopyrightText: 2017 Scott Petrovic <scottpetrovic@gmail.com>
  *
  *  SPDX-License-Identifier: LGPL-2.0-or-later
  */
 
 #ifndef _VANISHINGPOINT_ASSISTANT_H_
 #define _VANISHINGPOINT_ASSISTANT_H_
 
 #include "kis_painting_assistant.h"
 #include <QObject>
 #include <QPolygonF>
 #include <QLineF>
 #include <QTransform>
 /* Design:
  *The idea behind the vanishing point ruler is that in a perspective deformed landscape, a set of parallel
  *lines al share a single vanishing point.
  *Therefore, a perspective can contain an theoretical infinite of vanishing points.
  *It's a pity if we only allowed an artist to access 1, 2 or 3 of these at any given time, as other
  *solutions for perspective tools do.
  *Hence a vanishing point ruler.
  *
  *This ruler is relatively simple compared to the other perspective ruler:
  *It has only one vanishing point that is required to draw.
  *However, it does have it's own weaknesses in how to determine onto which of these infinite rulers to snap.
  *Furthermore, it has four extra handles for adding a perspective ruler to a preexisting perspective.
  */
 //class VanishingPoint;
 
 class VanishingPointAssistant : public KisPaintingAssistant
 {
 public:
     VanishingPointAssistant();
 
     enum VanishingPointAssistantHandle {
         VanishingPointHandle,
         LocalFirstHandle,
         LocalSecondHandle
     };
 
     KisPaintingAssistantSP clone(QMap<KisPaintingAssistantHandleSP, KisPaintingAssistantHandleSP> &handleMap) const override;
     QPointF adjustPosition(const QPointF& point, const QPointF& strokeBegin, bool snapToAny, qreal moveThresholdPt) override;
     void adjustLine(QPointF &point, QPointF& strokeBegin) override;
     QPointF getDefaultEditorPosition() const override;
     int numHandles() const override { return isLocal() ? 3 : 1; }
 
     float referenceLineDensity();
     void setReferenceLineDensity(float value);
 
     bool isAssistantComplete() const override;
     bool canBeLocal() const override;
 
     void saveCustomXml(QXmlStreamWriter* xml) override;
     bool loadCustomXml(QXmlStreamReader* xml) override;
 
 protected:
     void drawAssistant(QPainter& gc, const QRectF& updateRect, const KisCoordinatesConverter* converter, bool  cached = true,KisCanvas2* canvas=nullptr, bool assistantVisible=true, bool previewVisible=true) override;
     void drawCache(QPainter& gc, const KisCoordinatesConverter *converter,  bool assistantVisible=true) override;
 
     KisPaintingAssistantHandleSP firstLocalHandle() const override;
     KisPaintingAssistantHandleSP secondLocalHandle() const override;
 
 private:
 
 
     QPointF project(const QPointF& pt, const QPointF& strokeBegin, qreal moveThresholdPt);
     explicit VanishingPointAssistant(const VanishingPointAssistant &rhs, QMap<KisPaintingAssistantHandleSP, KisPaintingAssistantHandleSP> &handleMap);
 
     KisCanvas2 *m_canvas {nullptr};
 
     float m_referenceLineDensity {15.0};
 };
 
 class VanishingPointAssistantFactory : public KisPaintingAssistantFactory
 {
 public:
     VanishingPointAssistantFactory();
     ~VanishingPointAssistantFactory() override;
     QString id() const override;
     QString name() const override;
     KisPaintingAssistant* createPaintingAssistant() const override;
 };
 
 #endif