window.cpp Example File

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  #include <QtWidgets>

  #include "window.h"
  #include "movementtransition.h"

  Window::Window()
  {
      pX = 5;
      pY = 5;

      QFontDatabase database;
      QFont font;
      if (database.families().contains("Monospace")) {
          font = QFont("Monospace");
      }
      else {
          foreach (QString family, database.families()) {
              if (database.isFixedPitch(family)) {
                  font = QFont(family);
                  break;
              }
          }
      }
      font.setPointSize(12);
      setFont(font);

      setupMap();
      buildMachine();
  }

  void Window::setStatus(const QString &status)
  {
      myStatus = status;
      repaint();
  }

  QString Window::status() const
  {
      return myStatus;
  }

  void Window::paintEvent(QPaintEvent * /* event */)
  {
      QFontMetrics metrics(font());
      QPainter painter(this);
      int fontHeight = metrics.height();
      int fontWidth = metrics.width('X');
      int yPos = fontHeight;
      int xPos;

      painter.fillRect(rect(), Qt::black);
      painter.setPen(Qt::white);

      painter.drawText(QPoint(0, yPos), status());

      for (int y = 0; y < HEIGHT; ++y) {
          yPos += fontHeight;
          xPos = 0;

          for (int x = 0; x < WIDTH; ++x) {
              if (y == pY && x == pX) {
                  xPos += fontWidth;
                  continue;
              }

              painter.setPen(Qt::white);

              double x1 = static_cast<double>(pX);
              double y1 = static_cast<double>(pY);
              double x2 = static_cast<double>(x);
              double y2 = static_cast<double>(y);

              if (x2<x1) {
                  x2+=0.5;
              } else if (x2>x1) {
                   x2-=0.5;
              }

              if (y2<y1) {
                   y2+=0.5;
              } else if (y2>y1) {
                   y2-=0.5;
              }

              double dx = x2 - x1;
              double dy = y2 - y1;

              double length = qSqrt(dx*dx+dy*dy);

              dx /= length;
              dy /= length;

              double xi = x1;
              double yi = y1;

              while (length > 0) {
                  int cx = static_cast<int>(xi+0.5);
                  int cy = static_cast<int>(yi+0.5);

                  if (x2 == cx && y2 == cy)
                      break;

                  if (!(x1==cx && y1==cy)
                      && (map[cx][cy] == '#' || (length-10) > 0)) {
                      painter.setPen(QColor(60,60,60));
                      break;
                  }

                  xi += dx;
                  yi += dy;
                  --length;
              }

              painter.drawText(QPoint(xPos, yPos), map[x][y]);
              xPos += fontWidth;
          }
      }
      painter.setPen(Qt::white);
      painter.drawText(QPoint(pX * fontWidth, (pY + 2) * fontHeight), QChar('@'));
  }

  QSize Window::sizeHint() const
  {
      QFontMetrics metrics(font());

      return QSize(metrics.width('X') * WIDTH, metrics.height() * (HEIGHT + 1));
  }

  void Window::buildMachine()
  {
      machine = new QStateMachine;

      QState *inputState = new QState(machine);
      inputState->assignProperty(this, "status", "Move the rogue with 2, 4, 6, and 8");

      MovementTransition *transition = new MovementTransition(this);
      inputState->addTransition(transition);

      QState *quitState = new QState(machine);
      quitState->assignProperty(this, "status", "Really quit(y/n)?");

      QKeyEventTransition *yesTransition = new
          QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_Y);
      yesTransition->setTargetState(new QFinalState(machine));
      quitState->addTransition(yesTransition);

      QKeyEventTransition *noTransition =
          new QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_N);
      noTransition->setTargetState(inputState);
      quitState->addTransition(noTransition);

      QKeyEventTransition *quitTransition =
          new QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_Q);
      quitTransition->setTargetState(quitState);
      inputState->addTransition(quitTransition);

      machine->setInitialState(inputState);

      connect(machine, SIGNAL(finished()), qApp, SLOT(quit()));

      machine->start();
  }

  void Window::movePlayer(Direction direction)
  {
      switch (direction) {
          case Left:
              if (map[pX - 1][pY] != '#')
                  --pX;
              break;
          case Right:
              if (map[pX + 1][pY] != '#')
                  ++pX;
              break;
          case Up:
              if (map[pX][pY - 1] != '#')
                  --pY;
              break;
          case Down:
              if (map[pX][pY + 1] != '#')
                  ++pY;
              break;
      }
      repaint();
  }

  void Window::setupMap()
  {
      qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

      for (int x = 0; x < WIDTH; ++x)
          for (int y = 0; y < HEIGHT; ++y) {
          if (x == 0 || x == WIDTH - 1 || y == 0 || y == HEIGHT - 1 || qrand() % 40 == 0)
              map[x][y] = '#';
          else
              map[x][y] = '.';
      }
  }