Qt 5.6 | Qt Widgets | 40000 Chips | chip.cpp Example File

Qt 5.6.2 Reference Documentation

# chip.cpp Example File

graphicsview/chip/chip.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
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      ** This file is part of the demonstration applications of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:LGPL21$
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      ** GNU Lesser General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU Lesser
      ** General Public License version 2.1 or version 3 as published by the Free
      ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
      ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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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();
      }