chip.cpp Example File

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  #include "chip.h"

  #include <QtWidgets>

  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);
      setAcceptHoverEvents(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();
  }