window.cpp Example File | Qt Widgets 5.6

Qt 5.6 | Qt Widgets | Rogue Example | window.cpp Example File

Qt 5.6.2 Reference Documentation

# window.cpp Example File

statemachine/rogue/window.cpp

      /****************************************************************************
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      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the documentation of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
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      ** modification, are permitted provided that the following conditions are
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      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
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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] = '.';
          }
      }