Qt Reference Documentation

# chip.cpp Example File

demos/chip/chip.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** GNU Lesser General Public License Usage
     ** This file may be used under the terms of the GNU Lesser General Public
     ** License version 2.1 as published by the Free Software Foundation and
     ** appearing in the file LICENSE.LGPL included in the packaging of this
     ** file. Please review the following information to ensure the GNU Lesser
     ** General Public License version 2.1 requirements will be met:
     ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
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     ** rights. These rights are described in the Nokia Qt LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU General
     ** Public License version 3.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of this
     ** file. Please review the following information to ensure the GNU General
     ** Public License version 3.0 requirements will be met:
     ** http://www.gnu.org/copyleft/gpl.html.
     **
     ** Other Usage
     ** Alternatively, this file may be used in accordance with the terms and
     ** conditions contained in a signed written agreement between you and Nokia.
     **
     **
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     ****************************************************************************/

     #include "chip.h"

     #include <QtGui>

     Chip::Chip(const QColor &color, int x, int y)
     {
         this->x = x;
         this->y = y;
         this->color = color;
         setZValue((x + y) % 2);

         setFlags(ItemIsSelectable | ItemIsMovable);
         setAcceptsHoverEvents(true);
     }

     QRectF Chip::boundingRect() const
     {
         return QRectF(0, 0, 110, 70);
     }

     QPainterPath Chip::shape() const
     {
         QPainterPath path;
         path.addRect(14, 14, 82, 42);
         return path;
     }

     void Chip::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
     {
         Q_UNUSED(widget);

         QColor fillColor = (option->state & QStyle::State_Selected) ? color.dark(150) : color;
         if (option->state & QStyle::State_MouseOver)
             fillColor = fillColor.light(125);

         const qreal lod = option->levelOfDetailFromTransform(painter->worldTransform());
         if (lod < 0.2) {
             if (lod < 0.125) {
                 painter->fillRect(QRectF(0, 0, 110, 70), fillColor);
                 return;
             }

             QBrush b = painter->brush();
             painter->setBrush(fillColor);
             painter->drawRect(13, 13, 97, 57);
             painter->setBrush(b);
             return;
         }

         QPen oldPen = painter->pen();
         QPen pen = oldPen;
         int width = 0;
         if (option->state & QStyle::State_Selected)
             width += 2;

         pen.setWidth(width);
         QBrush b = painter->brush();
         painter->setBrush(QBrush(fillColor.dark(option->state & QStyle::State_Sunken ? 120 : 100)));

         painter->drawRect(QRect(14, 14, 79, 39));
         painter->setBrush(b);

         if (lod >= 1) {
             painter->setPen(QPen(Qt::gray, 1));
             painter->drawLine(15, 54, 94, 54);
             painter->drawLine(94, 53, 94, 15);
             painter->setPen(QPen(Qt::black, 0));
         }

         // Draw text
         if (lod >= 2) {
             QFont font("Times", 10);
             font.setStyleStrategy(QFont::ForceOutline);
             painter->setFont(font);
             painter->save();
             painter->scale(0.1, 0.1);
             painter->drawText(170, 180, QString("Model: VSC-2000 (Very Small Chip) at %1x%2").arg(x).arg(y));
             painter->drawText(170, 200, QString("Serial number: DLWR-WEER-123L-ZZ33-SDSJ"));
             painter->drawText(170, 220, QString("Manufacturer: Chip Manufacturer"));
             painter->restore();
         }

         // Draw lines
         QVarLengthArray<QLineF, 36> lines;
         if (lod >= 0.5) {
             for (int i = 0; i <= 10; i += (lod > 0.5 ? 1 : 2)) {
                 lines.append(QLineF(18 + 7 * i, 13, 18 + 7 * i, 5));
                 lines.append(QLineF(18 + 7 * i, 54, 18 + 7 * i, 62));
             }
             for (int i = 0; i <= 6; i += (lod > 0.5 ? 1 : 2)) {
                 lines.append(QLineF(5, 18 + i * 5, 13, 18 + i * 5));
                 lines.append(QLineF(94, 18 + i * 5, 102, 18 + i * 5));
             }
         }
         if (lod >= 0.4) {
             const QLineF lineData[] = {
                 QLineF(25, 35, 35, 35),
                 QLineF(35, 30, 35, 40),
                 QLineF(35, 30, 45, 35),
                 QLineF(35, 40, 45, 35),
                 QLineF(45, 30, 45, 40),
                 QLineF(45, 35, 55, 35)
             };
             lines.append(lineData, 6);
         }
         painter->drawLines(lines.data(), lines.size());

         // Draw red ink
         if (stuff.size() > 1) {
             QPen p = painter->pen();
             painter->setPen(QPen(Qt::red, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
             painter->setBrush(Qt::NoBrush);
             QPainterPath path;
             path.moveTo(stuff.first());
             for (int i = 1; i < stuff.size(); ++i)
                 path.lineTo(stuff.at(i));
             painter->drawPath(path);
             painter->setPen(p);
         }
     }

     void Chip::mousePressEvent(QGraphicsSceneMouseEvent *event)
     {
         QGraphicsItem::mousePressEvent(event);
         update();
     }

     void Chip::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
     {
         if (event->modifiers() & Qt::ShiftModifier) {
             stuff << event->pos();
             update();
             return;
         }
         QGraphicsItem::mouseMoveEvent(event);
     }

     void Chip::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
     {
         QGraphicsItem::mouseReleaseEvent(event);
         update();
     }