interface.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

/**********************************************************************
** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact [e-mail] if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include "interface.h"

#include <qtopia/resource.h>

#include <qtopia/qpetoolbar.h>
#include <qtoolbutton.h>
#include <qstyle.h>
#include <qapplication.h>
#include <qmessagebox.h>

SnakeGame::SnakeGame(QWidget* parent, const char* name, WFlags f) :
    QMainWindow(parent,name,f),
    canvas(232, 258),
    ob_top(NULL), ob_bottom(NULL),
    border_north(NULL), border_south(NULL),
    border_east(NULL), border_west(NULL)
{
    setCaption( tr("Snake") );
    QPixmap bg = Resource::loadPixmap("grass");
    canvas.setBackgroundPixmap(bg);
    canvas.setUpdatePeriod(100);
    snake = 0;

    cv = new QCanvasView(&canvas, this);

    setToolBarsMovable( FALSE );

    QPEToolBar* toolbar = new QPEToolBar( this);
    toolbar->setHorizontalStretchable( TRUE );
    (void)new QToolButton(Resource::loadIconSet("Snake"), tr("New Game"), 0,
                            this, SLOT(newGame()), toolbar, "New Game");

    scorelabel = new QLabel(toolbar);
    showScore(0);
    scorelabel->setBackgroundMode( PaletteButton );
    scorelabel->setAlignment( AlignRight | AlignVCenter | ExpandTabs );
    toolbar->setStretchableWidget( scorelabel );

    setFocusPolicy(StrongFocus);

    setCentralWidget(cv);

    gamestopped = true; 
    waitover = true;
}

SnakeGame::~SnakeGame()
{
   delete snake;
}

void SnakeGame::resizeEvent(QResizeEvent *)
{
    QSize s = centralWidget()->size();
    int fw = style().defaultFrameWidth();
    canvas.resize( s.width() - fw - 2, s.height() - fw - 2);

    if (snake) {
	newGame();
    } else {
	setupWalls();
    }
}

void SnakeGame::focusOutEvent(QFocusEvent *) {
    if (snake)
	snake->pause();
}

void SnakeGame::focusInEvent(QFocusEvent *) {
    if (snake)
	snake->pause();
}

void SnakeGame::newGame()
{   
    clear();
    snake = new Snake(&canvas);
    connect(snake, SIGNAL(dead()), this, SLOT(gameOver()) );
    connect(snake, SIGNAL(targethit()), this, SLOT(levelUp()) );
    connect(snake, SIGNAL(scorechanged()), this, SLOT(scoreInc()) );
    connect(this, SIGNAL(moveFaster()), snake, SLOT(increaseSpeed()) );
    last = 0;
    targetamount = 1;
    notargets = 1;
    level = 1;
    stage = 1;
    showScore(0);
    gamestopped = false;
    waitover = true;

    setupWalls();
    createTargets();
}

//
// Create walls and obstacles.
//
void
SnakeGame::setupWalls(void)
{
    if (ob_top) {	    // if one is setup, all are setup
	delete ob_top;
	delete ob_bottom;
	delete border_north;
	delete border_west;
	delete border_east;
	delete border_south;
    }

    ob_top = new Obstacle(&canvas, 64);
    ob_bottom = new Obstacle(&canvas, canvas.height() - 50);
    border_north = new Border(&canvas, Border::North);
    border_west = new Border(&canvas, Border::West);
    border_east = new Border(&canvas, Border::East);
    border_south = new Border(&canvas, Border::South);
}


void SnakeGame::showScore(int score)
{
    scorelabel->setText(tr("     Score :    %1   ").arg(score) );
}


void SnakeGame::scoreInc()
{
   showScore( snake->getScore() );
}

void SnakeGame::levelUp()
{
   notargets--;
   if (notargets == 0) {
        stage++;
       if (stage == 3) {
          level++;
          emit moveFaster();
          targetamount++;
          stage = 0;
       }
       createTargets();
   }
}

void SnakeGame::createTargets()
{  
    Target  *foo;
    int	    new_target_count = 0;

    for (int i = 0; i < targetamount; i++) {
	foo = new Target(&canvas);
	if(foo->position() == FALSE) {
	    delete foo;		// ran out of room for targets
	} else {
	    foo->show();
	    new_target_count++;
	}
    }

    notargets = targetamount = new_target_count;
}

void SnakeGame::clear()
{
   delete snake;
   snake = 0;
   QCanvasItemList l = canvas.allItems();
   for (QCanvasItemList::Iterator it=l.begin(); it!=l.end(); ++it) {
        delete *it;
   }  

    ob_top = NULL;
    ob_bottom = NULL;
    border_north = NULL;
    border_west = NULL;
    border_east = NULL;
    border_south = NULL;
}

void SnakeGame::gameOver()
{
   int score = snake->getScore();
   QString scoreoutput="";
   scoreoutput.setNum(score);
   QCanvasText* gameover = new QCanvasText(tr("GAME OVER!\n Your Score: %1").arg( scoreoutput), &canvas); 
 
   gameover->setZ(100);
   gameover->setColor(yellow);
   gameover->setFont( QFont("times", 18, QFont::Bold) );
   int w = gameover->boundingRect().width();
   gameover->move(canvas.width()/2 -w/2, canvas.height()/2 -50);
   gameover->show();
   gamestopped = true;
   waitover = false;
}

void SnakeGame::keyPressEvent(QKeyEvent* event)
{ 
   if (gamestopped) {
        if (waitover) 
           newGame();
        else 
           return;
   }
   else { 
       int newkey = event->key();
       snake->go(newkey);
   }
}