File indexing completed on 2024-12-22 04:14:23

 /*
  * SPDX-FileCopyrightText: 2008 Cyrille Berger <cberger@cberger.net>
  * SPDX-FileCopyrightText: 2010 Geoffry Song <goffrie@gmail.com>
  * SPDX-FileCopyrightText: 2017 Scott Petrovic <scottpetrovic@gmail.com>
  *
  *  SPDX-License-Identifier: LGPL-2.0-or-later
  */
 
 #include "EllipseAssistant.h"
 
 #include <klocalizedstring.h>
 #include "kis_debug.h"
 #include <QPainter>
 #include <QPainterPath>
 #include <QLinearGradient>
 #include <QTransform>
 
 #include <kis_canvas2.h>
 #include <kis_coordinates_converter.h>
 #include "kis_algebra_2d.h"
 
 #include <math.h>
 
 EllipseAssistant::EllipseAssistant()
         : KisPaintingAssistant("ellipse", i18n("Ellipse assistant"))
 {
 }
 
 EllipseAssistant::EllipseAssistant(const EllipseAssistant &rhs, QMap<KisPaintingAssistantHandleSP, KisPaintingAssistantHandleSP> &handleMap)
     : KisPaintingAssistant(rhs, handleMap)
     , e(rhs.e)
 {
 }
 
 KisPaintingAssistantSP EllipseAssistant::clone(QMap<KisPaintingAssistantHandleSP, KisPaintingAssistantHandleSP> &handleMap) const
 {
     return KisPaintingAssistantSP(new EllipseAssistant(*this, handleMap));
 }
 
 QPointF EllipseAssistant::project(const QPointF& pt) const
 {
     Q_ASSERT(isAssistantComplete());
     e.set(*handles()[0], *handles()[1], *handles()[2]);
     return e.project(pt);
 }
 
 QPointF EllipseAssistant::adjustPosition(const QPointF& pt, const QPointF& /*strokeBegin*/, const bool /*snapToAny*/, qreal /*moveThresholdPt*/)
 {
     return project(pt);
 
 }
 
 void EllipseAssistant::adjustLine(QPointF &point, QPointF &strokeBegin)
 {
     const QPointF p1 = point;
     const QPointF p2 = strokeBegin;
 
     Q_ASSERT(isAssistantComplete());
     e.set(*handles()[0], *handles()[1], *handles()[2]);
 
     QPointF p3 = e.project(p1);
     QPointF p4 = e.project(p2);
     point = p3;
     strokeBegin = p4;
 }
 
 void EllipseAssistant::drawAssistant(QPainter& gc, const QRectF& updateRect, const KisCoordinatesConverter* converter, bool cached, KisCanvas2* canvas, bool assistantVisible, bool previewVisible)
 {
     gc.save();
     gc.resetTransform();
     QPoint mousePos;
     
     if (canvas){
         //simplest, cheapest way to get the mouse-position//
         mousePos= canvas->canvasWidget()->mapFromGlobal(QCursor::pos());
     }
     else {
         //...of course, you need to have access to a canvas-widget for that.//
         mousePos = QCursor::pos();//this'll give an offset//
         dbgFile<<"canvas does not exist in the ellipse assistant, you may have passed arguments incorrectly:"<<canvas;
     }
 
     QTransform initialTransform = converter->documentToWidgetTransform();
 
     if (isSnappingActive() && boundingRect().contains(initialTransform.inverted().map(mousePos), false) && previewVisible==true){
 
         if (isAssistantComplete()){
             if (e.set(*handles()[0], *handles()[1], *handles()[2])) {
                 // valid ellipse
                 gc.setTransform(initialTransform);
                 gc.setTransform(e.getInverse(), true);
                 QPainterPath path;
                 //path.moveTo(QPointF(-e.semiMajor(), 0)); path.lineTo(QPointF(e.semiMajor(), 0));
                 //path.moveTo(QPointF(0, -e.semiMinor())); path.lineTo(QPointF(0, e.semiMinor()));
                 // Draw the ellipse
                 path.addEllipse(QPointF(0, 0), e.semiMajor(), e.semiMinor());
                 drawPreview(gc, path);
             }
         }
     }
     gc.restore();
     KisPaintingAssistant::drawAssistant(gc, updateRect, converter, cached, canvas, assistantVisible, previewVisible);
 
 }
 
 
 void EllipseAssistant::drawCache(QPainter& gc, const KisCoordinatesConverter *converter, bool assistantVisible)
 {
 
     if (assistantVisible == false || handles().size() < 2){
         return;
     }
 
     QTransform initialTransform = converter->documentToWidgetTransform();
 
     if (handles().size() == 2) {
         // just draw the axis
         gc.setTransform(initialTransform);
         QPainterPath path;
         path.moveTo(*handles()[0]);
         path.lineTo(*handles()[1]);
         drawPath(gc, path, isSnappingActive());
         return;
     }
     if (e.set(*handles()[0], *handles()[1], *handles()[2])) {
         // valid ellipse
 
         gc.setTransform(initialTransform);
         gc.setTransform(e.getInverse(), true);
         QPainterPath path;
         path.moveTo(QPointF(-e.semiMajor(), 0)); path.lineTo(QPointF(e.semiMajor(), 0));
         path.moveTo(QPointF(0, -e.semiMinor())); path.lineTo(QPointF(0, e.semiMinor()));
         // Draw the ellipse
         path.addEllipse(QPointF(0, 0), e.semiMajor(), e.semiMinor());
         drawPath(gc, path, isSnappingActive());
     }
 }
 
 QRect EllipseAssistant::boundingRect() const
 {
     if (!isAssistantComplete()) {
         return KisPaintingAssistant::boundingRect();
     }
 
     if (e.set(*handles()[0], *handles()[1], *handles()[2])) {
         return e.boundingRect().adjusted(-2, -2, 2, 2).toAlignedRect();
     } else {
         return QRect();
     }
 }
 
 QPointF EllipseAssistant::getDefaultEditorPosition() const
 {
     return (*handles()[0] + *handles()[1]) * 0.5;
 }
 
 bool EllipseAssistant::isAssistantComplete() const
 {
     return handles().size() >= 3;
 }
 
 void EllipseAssistant::transform(const QTransform &transform)
 {
     e.set(*handles()[0], *handles()[1], *handles()[2]);
 
     QPointF newAxes;
     QTransform newTransform;
 
     std::tie(newAxes, newTransform) = KisAlgebra2D::transformEllipse(QPointF(e.semiMajor(), e.semiMinor()), e.getInverse() * transform);
 
     const QPointF p1 = newTransform.map(QPointF(newAxes.x(), 0));
     const QPointF p2 = newTransform.map(QPointF(-newAxes.x(), 0));
     const QPointF p3 = newTransform.map(QPointF(0, newAxes.y()));
 
     *handles()[0] = p1;
     *handles()[1] = p2;
     *handles()[2] = p3;
 
     uncache();
 }
 
 EllipseAssistantFactory::EllipseAssistantFactory()
 {
 }
 
 EllipseAssistantFactory::~EllipseAssistantFactory()
 {
 }
 
 QString EllipseAssistantFactory::id() const
 {
     return "ellipse";
 }
 
 QString EllipseAssistantFactory::name() const
 {
     return i18n("Ellipse");
 }
 
 KisPaintingAssistant* EllipseAssistantFactory::createPaintingAssistant() const
 {
     return new EllipseAssistant;
 }