File indexing completed on 2024-06-16 04:15:52

 /*
  * 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
  */
 
 #include "VanishingPointAssistant.h"
 
 #include "kis_debug.h"
 #include <klocalizedstring.h>
 
 #include <QPainter>
 #include <QPainterPath>
 #include <QLinearGradient>
 #include <QTransform>
 
 #include <kis_canvas2.h>
 #include <kis_coordinates_converter.h>
 #include <kis_algebra_2d.h>
 #include <kis_dom_utils.h>
 #include <math.h>
 
 VanishingPointAssistant::VanishingPointAssistant()
     : KisPaintingAssistant("vanishing point", i18n("Vanishing Point assistant"))
 {
 }
 
 VanishingPointAssistant::VanishingPointAssistant(const VanishingPointAssistant &rhs, QMap<KisPaintingAssistantHandleSP, KisPaintingAssistantHandleSP> &handleMap)
     : KisPaintingAssistant(rhs, handleMap)
     , m_canvas(rhs.m_canvas)
     , m_referenceLineDensity(rhs.m_referenceLineDensity)
 {
 }
 
 KisPaintingAssistantSP VanishingPointAssistant::clone(QMap<KisPaintingAssistantHandleSP, KisPaintingAssistantHandleSP> &handleMap) const
 {
     return KisPaintingAssistantSP(new VanishingPointAssistant(*this, handleMap));
 }
 
 QPointF VanishingPointAssistant::project(const QPointF& pt, const QPointF& strokeBegin, qreal /*moveThresholdPt*/)
 {
     //Q_ASSERT(handles().size() == 1 || handles().size() == 5);
 
     if (isLocal() && isAssistantComplete()) {
         if (getLocalRect().contains(pt)) {
             m_hasBeenInsideLocalRect = true;
         } else if (!m_hasBeenInsideLocalRect) { // isn't inside and wasn't inside before
             return QPointF(qQNaN(), qQNaN());
         }
     }
 
     //dbgKrita<<strokeBegin<< ", " <<*handles()[0];
     QLineF snapLine = QLineF(*handles()[0], strokeBegin);
 
 
     qreal dx = snapLine.dx();
     qreal dy = snapLine.dy();
 
     const qreal dx2 = dx * dx;
     const qreal dy2 = dy * dy;
     const qreal invsqrlen = 1.0 / (dx2 + dy2);
 
     QPointF r(dx2 * pt.x() + dy2 * snapLine.x1() + dx * dy * (pt.y() - snapLine.y1()),
               dx2 * snapLine.y1() + dy2 * pt.y() + dx * dy * (pt.x() - snapLine.x1()));
 
     r *= invsqrlen;
     return r;
 }
 
 QPointF VanishingPointAssistant::adjustPosition(const QPointF& pt, const QPointF& strokeBegin, const bool /*snapToAny*/, qreal moveThresholdPt)
 {
     return project(pt, strokeBegin, moveThresholdPt);
 }
 
 void VanishingPointAssistant::adjustLine(QPointF &point, QPointF &strokeBegin)
 {
     point = project(point, strokeBegin, 0.0);
 }
 
 void VanishingPointAssistant::drawAssistant(QPainter& gc, const QRectF& updateRect, const KisCoordinatesConverter* converter, bool cached, KisCanvas2* canvas, bool assistantVisible, bool previewVisible)
 {
     // HACK ALERT: side handles aren't saved in old krita versions
     // we need to just add a default position for now if we are loading a vanishing point
     if (sideHandles().isEmpty()) {
         QPointF vpPoint = *handles()[0]; // main vanishing point
         addHandle(new KisPaintingAssistantHandle(vpPoint + QPointF(-70,0)), HandleType::SIDE);
         addHandle(new KisPaintingAssistantHandle(vpPoint + QPointF(-140,0)), HandleType::SIDE);
         addHandle(new KisPaintingAssistantHandle(vpPoint + QPointF(70,0)), HandleType::SIDE);
         addHandle(new KisPaintingAssistantHandle(vpPoint + QPointF(140,0)), HandleType::SIDE);
     }
 
     gc.save();
     gc.resetTransform();
 
     QRect viewport= gc.viewport();
 
     QPolygonF viewportAndLocalPoly = (isLocal() && isAssistantComplete()) ?
                 QPolygonF(QRectF(viewport)).intersected(converter->documentToWidgetTransform().map(QPolygonF(QRectF(getLocalRect())))) : QPolygonF(QRectF(viewport));
 
     // draw controls when we are not editing
     if (canvas && canvas->paintingAssistantsDecoration()->isEditingAssistants() == false && isAssistantComplete()) {
 
         if (isSnappingActive() && previewVisible == true) {
             //don't draw if invalid.
 
             QTransform initialTransform = converter->documentToWidgetTransform();
             QPointF startPoint = initialTransform.map(*handles()[0]);
             QPointF mousePos = effectiveBrushPosition(converter, canvas);
 
             QLineF snapLine= QLineF(startPoint, mousePos);
 
             KisAlgebra2D::cropLineToConvexPolygon(snapLine, viewportAndLocalPoly, false, true);
 
             QPainterPath path;
 
             path.moveTo(snapLine.p2());
             path.lineTo(snapLine.p1());
 
             drawPreview(gc, path);//and we draw the preview.
 
         }
     }
 
 
 
 
     // editor specific controls display
     if (canvas && canvas->paintingAssistantsDecoration()->isEditingAssistants()) {
 
         // draws a circle around the vanishing point node while editing
         QTransform initialTransform = converter->documentToWidgetTransform();
         QPointF p0 = initialTransform.map(*handles()[0]); // main vanishing point
         QPointF p1 = initialTransform.map(*sideHandles()[0]);
         QPointF p2 = initialTransform.map(*sideHandles()[1]);
         QPointF p3 = initialTransform.map(*sideHandles()[2]);
         QPointF p4 = initialTransform.map(*sideHandles()[3]);
 
 
         QRectF ellipse = QRectF(QPointF(p0.x() -15, p0.y() -15), QSizeF(30, 30));
 
         QPainterPath pathCenter;
         pathCenter.addEllipse(ellipse);
         drawPath(gc, pathCenter, isSnappingActive());
 
         QColor paintingColor = effectiveAssistantColor();
 
 
         // draw the lines connecting the different nodes
         QPen penStyle(paintingColor, 2.0, Qt::SolidLine);
 
         if (!isSnappingActive()) {
             QColor snappingColor = paintingColor;
             snappingColor.setAlpha(snappingColor.alpha() * 0.2);
 
             penStyle.setColor(snappingColor);
         }
 
         gc.save();
         gc.setPen(penStyle);
         gc.drawLine(p0, p1);
         gc.drawLine(p0, p3);
         gc.drawLine(p1, p2);
         gc.drawLine(p3, p4);
         gc.restore();
     }
 
     QTransform initialTransform = converter->documentToWidgetTransform();
 
     // draw the local rectangle
     if (assistantVisible && isLocal() && isAssistantComplete()) {
         // limited area rectangle
         QPainterPath path;
         QPointF p1 = *handles()[(int)LocalFirstHandle];
         QPointF p3 = *handles()[(int)LocalSecondHandle];
         QPointF p2 = QPointF(p1.x(), p3.y());
         QPointF p4 = QPointF(p3.x(), p1.y());
 
         path.moveTo(initialTransform.map(p1));
 
         path.lineTo(initialTransform.map(p2));
         path.lineTo(initialTransform.map(p3));
         path.lineTo(initialTransform.map(p4));
         path.lineTo(initialTransform.map(p1));
         drawPath(gc, path, isSnappingActive());//and we draw the rectangle
     }
 
 
     // draw references guide for vanishing points at specified density
     if (assistantVisible && this->isSnappingActive() ) {
 
         // cycle through degrees from 0 to 180. We are doing an infinite line, so we don't need to go 360
         QPointF p0 = initialTransform.map(*handles()[0]); // main vanishing point
 
         for (int currentAngle=0; currentAngle <= 180; currentAngle = currentAngle + m_referenceLineDensity ) {
 
             // determine the correct angle based on the iteration
             float xPos = cos(currentAngle * M_PI / 180);
             float yPos = sin(currentAngle * M_PI / 180);
             QPointF unitAngle;
             unitAngle.setX(p0.x() + xPos);
             unitAngle.setY(p0.y() + yPos);
 
             // find point
             QLineF snapLine= QLineF(p0, unitAngle);
             KisAlgebra2D::intersectLineConvexPolygon(snapLine, viewportAndLocalPoly, true, true);
 
             // make a line from VP center to edge of canvas with that angle
             QPainterPath path;
             path.moveTo(snapLine.p1());
             path.lineTo(snapLine.p2());
             drawPreview(gc, path);//and we draw the preview.
         }
     }
 
 
     gc.restore();
 
     KisPaintingAssistant::drawAssistant(gc, updateRect, converter, cached, canvas, assistantVisible, previewVisible);
 }
 
 void VanishingPointAssistant::drawCache(QPainter& gc, const KisCoordinatesConverter *converter, bool assistantVisible)
 {
     if (!m_canvas || !isAssistantComplete()) {
         return;
     }
 
     if (assistantVisible == false ||   m_canvas->paintingAssistantsDecoration()->isEditingAssistants()) {
         return;
     }
 
     QTransform initialTransform = converter->documentToWidgetTransform();
     QPointF p0 = initialTransform.map(*handles()[0]);
 
     // draws an "X"
     QPainterPath path;
     path.moveTo(QPointF(p0.x() - 10.0, p0.y() - 10.0));
     path.lineTo(QPointF(p0.x() + 10.0, p0.y() + 10.0));
 
     path.moveTo(QPointF(p0.x() - 10.0, p0.y() + 10.0));
     path.lineTo(QPointF(p0.x() + 10.0, p0.y() - 10.0));
 
 
     drawPath(gc, path, isSnappingActive());
 }
 
 KisPaintingAssistantHandleSP VanishingPointAssistant::firstLocalHandle() const
 {
     if (handles().size() > LocalFirstHandle) {
         return handles().at(LocalFirstHandle);
     } else {
         return nullptr;
     }
 }
 
 KisPaintingAssistantHandleSP VanishingPointAssistant::secondLocalHandle() const
 {
     if (handles().size() > LocalSecondHandle) {
         return handles().at(LocalSecondHandle);
     } else {
         return nullptr;
     }
 }
 
 QPointF VanishingPointAssistant::getDefaultEditorPosition() const
 {
     int pointHandle = 0;
     if (handles().size() > pointHandle) {
         return *handles().at(pointHandle);
     } else {
         KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE(false, QPointF(0, 0));
         return QPointF(0, 0);
     }
 }
 
 void VanishingPointAssistant::setReferenceLineDensity(float value)
 {
     // cannot have less than 1 degree value
     if (value < 1.0) {
         value = 1.0;
     }
 
     m_referenceLineDensity = value;
 }
 
 float VanishingPointAssistant::referenceLineDensity()
 {
     return m_referenceLineDensity;
 }
 
 bool VanishingPointAssistant::isAssistantComplete() const
 {
     return handles().size() >= numHandles();
 }
 
 bool VanishingPointAssistant::canBeLocal() const
 {
     return true;
 }
 
 void VanishingPointAssistant::saveCustomXml(QXmlStreamWriter* xml)
 {
     xml->writeStartElement("angleDensity");
     xml->writeAttribute("value", KisDomUtils::toString( this->referenceLineDensity()));
     xml->writeEndElement();
     xml->writeStartElement("isLocal");
     xml->writeAttribute("value", KisDomUtils::toString( (int)this->isLocal()));
     xml->writeEndElement();
 }
 
 bool VanishingPointAssistant::loadCustomXml(QXmlStreamReader* xml)
 {
     if (xml && xml->name() == "angleDensity") {
         this->setReferenceLineDensity((float)KisDomUtils::toDouble(xml->attributes().value("value").toString()));
     }
     if (xml && xml->name() == "isLocal") {
         this->setLocal((bool)KisDomUtils::toInt(xml->attributes().value("value").toString()));
     }
 
     return true;
 }
 
 
 VanishingPointAssistantFactory::VanishingPointAssistantFactory()
 {
 }
 
 VanishingPointAssistantFactory::~VanishingPointAssistantFactory()
 {
 }
 
 QString VanishingPointAssistantFactory::id() const
 {
     return "vanishing point";
 }
 
 QString VanishingPointAssistantFactory::name() const
 {
     return i18n("Vanishing Point");
 }
 
 KisPaintingAssistant* VanishingPointAssistantFactory::createPaintingAssistant() const
 {
     return new VanishingPointAssistant;
 }