File indexing completed on 2023-10-01 04:15:55

0001 /*
0002     SPDX-FileCopyrightText: 1999-2006 √Čric Bischoff <ebischoff@nerim.net>
0003     SPDX-FileCopyrightText: 2007 Albert Astals Cid <aacid@kde.org>
0004 
0005     SPDX-License-Identifier: GPL-2.0-or-later
0006 */
0007 
0008 /* Object to draw on the game board */
0009 
0010 #include "todraw.h"
0011 
0012 #include <QDataStream>
0013 #include <QPainter>
0014 #include <QSvgRenderer>
0015 
0016 static QImage toImage(const QString &element, int width, int height, QSvgRenderer *renderer)
0017 {
0018   QImage img(width, height, QImage::Format_ARGB32_Premultiplied);
0019   img.fill(Qt::transparent);
0020   QPainter p2(&img);
0021   // don't need quality here
0022   p2.setRenderHints(QPainter::Antialiasing|QPainter::TextAntialiasing|QPainter::SmoothPixmapTransform, false);
0023   renderer->render(&p2, element);
0024   p2.end();
0025   return img;
0026 }
0027 
0028 
0029 ToDraw::ToDraw()
0030  : m_beingDragged(false)
0031 {
0032 }
0033 
0034 // Load an object from a file
0035 bool ToDraw::load(QDataStream &stream)
0036 {
0037   // NOTE: read error checking?
0038   QPointF pos;
0039   QString element;
0040   qreal zOrder;
0041 
0042   stream >> pos;
0043   stream >> element;
0044   stream >> zOrder;
0045 
0046   setPos(pos);
0047   setElementId(element);
0048   setZValue(zOrder);
0049 
0050   return true;
0051 }
0052 
0053 // Save an object to a file
0054 void ToDraw::save(QDataStream &stream) const
0055 {
0056   stream << pos();
0057   stream << elementId();
0058   stream << zValue();
0059 }
0060 
0061 QRectF ToDraw::unclippedRect() const
0062 {
0063   return QGraphicsSvgItem::boundingRect();
0064 }
0065 
0066 QRectF ToDraw::clippedRectAt(const QPointF &somePos) const
0067 {
0068   if (m_beingDragged)
0069     return unclippedRect();
0070 
0071   QRectF backgroundRect = renderer()->boundsOnElement(QStringLiteral( "background" ));
0072   backgroundRect.translate(-somePos);
0073   backgroundRect = transform().inverted().map(backgroundRect).boundingRect();
0074 
0075   return unclippedRect().intersected(backgroundRect);
0076 }
0077 
0078 void ToDraw::setBeingDragged(bool dragged)
0079 {
0080     prepareGeometryChange();
0081     m_beingDragged = dragged;
0082 }
0083 
0084 QRectF ToDraw::boundingRect() const
0085 {
0086   return clippedRectAt(pos());
0087 }
0088 
0089 QVariant ToDraw::itemChange(GraphicsItemChange change, const QVariant& value)
0090 {
0091   if (change == QGraphicsItem::ItemPositionChange) {
0092     if (boundingRect() != clippedRectAt(value.toPointF()))
0093       prepareGeometryChange();
0094   }
0095   return QGraphicsSvgItem::itemChange(change, value);
0096 }
0097 
0098 bool ToDraw::contains(const QPointF &point) const
0099 {
0100     bool result = QGraphicsSvgItem::contains(point);
0101     if (result)
0102     {
0103         QRectF bounds = transform().mapRect(unclippedRect());
0104         const QImage &img = toImage(elementId(), qRound(bounds.width()), qRound(bounds.height()), renderer());
0105         QPointF transformedPoint = transform().map(point);
0106         result = qAlpha(img.pixel(transformedPoint.toPoint())) != 0;
0107     }
0108     return result;
0109 }
0110 
0111 int ToDraw::type() const
0112 {
0113   return Type;
0114 }