Qt Reference Documentation

chip.cpp Example File

demos/chip/chip.cpp
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 ** This file is part of the demonstration applications of the Qt Toolkit.
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 ** GNU Lesser General Public License Usage
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 ** General Public License version 3.0 as published by the Free Software
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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();
 }
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