view.cpp

Linux下的基于X11的图形开发环境。

/*
 * KAsteroids - Copyright (c) Martin R. Jones 1997
 *
 * Part of the KDE project
 */

#include <stdlib.h>
#include <math.h>
#include <qapplication.h>
#include <qkeycode.h>
#include <qaccel.h>
#include <qmessagebox.h>

#include "view.h"

#define IMG_BACKGROUND "qasteroids/bg.png"

#define REFRESH_DELAY           33
#define SHIP_SPEED              0.3
#define MISSILE_SPEED           10.0
#define SHIP_STEPS              64
#define ROTATE_RATE             2
#define SHIELD_ON_COST          1
#define SHIELD_HIT_COST         30
#define BRAKE_ON_COST           4

#define MAX_ROCK_SPEED          2.5
#define MAX_POWERUP_SPEED       1.5
#define MAX_SHIP_SPEED		12
#define MAX_BRAKES              5
#define MAX_SHIELDS             5
#define MAX_FIREPOWER		5

#define TEXT_SPEED              4

#define PI_X_2                  6.283185307
#ifndef M_PI
#define M_PI 3.141592654
#endif

struct
{
    int id;
    const char *path;
    int frames;
}
kas_animations [] =
{
    { ID_ROCK_LARGE,       "rock1/rock1%1.png",       32 },
    { ID_ROCK_MEDIUM,      "rock2/rock2%1.png",       32 },
    { ID_ROCK_SMALL,       "rock3/rock3%1.png",       32 },
    { ID_SHIP,             "ship/ship%1.png",         32 },
    { ID_MISSILE,          "missile/missile.png",      1 },
    { ID_BIT,              "bits/bits%1.png",         16 },
    { ID_EXHAUST,          "exhaust/exhaust.png",      1 },
    { ID_ENERGY_POWERUP,   "powerups/energy.png",      1 },
//    { ID_TELEPORT_POWERUP, "powerups/teleport%1.png", 12 },
    { ID_BRAKE_POWERUP,    "powerups/brake.png",       1 },
    { ID_SHIELD_POWERUP,   "powerups/shield.png",      1 },
    { ID_SHOOT_POWERUP,    "powerups/shoot.png",       1 },
    { ID_SHIELD,           "shield/shield%1.png",      6 },
    { 0,                   0,                          0 }
};



KAsteroidsView::KAsteroidsView( QWidget *parent, const char *name )
    : QWidget( parent, name ),
      field(640, 440),
      view(&field,this)
{
    view.setVScrollBarMode( QScrollView::AlwaysOff );
    view.setHScrollBarMode( QScrollView::AlwaysOff );
    view.viewport()->setFocusProxy( this );
    rocks.setAutoDelete( TRUE );
    missiles.setAutoDelete( TRUE );
    bits.setAutoDelete( TRUE );
    powerups.setAutoDelete( TRUE );
    exhaust.setAutoDelete( TRUE );

    field.setBackgroundColor( black );
    QPixmap pm( IMG_BACKGROUND );
    field.setBackgroundPixmap( pm );

    textSprite = new QCanvasText( &field );
    QFont font( "helvetica", 18 );
    textSprite->setFont( font );

    shield = 0;
    shieldOn = FALSE;
    refreshRate = REFRESH_DELAY;

    initialized = readSprites();

    shieldTimer = new QTimer( this );
    connect( shieldTimer, SIGNAL(timeout()), this, SLOT(hideShield()) );
    mTimerId = -1;

    shipPower = MAX_POWER_LEVEL;
    vitalsChanged = TRUE;
    can_destroy_powerups = FALSE;

    mPaused = TRUE;

    if ( !initialized ) {
	textSprite->setText( tr("Error: Cannot read sprite images") );
	textSprite->setColor( red );
	textSprite->move( (field.width()-textSprite->boundingRect().width()) / 2,
			  (field.height()-textSprite->boundingRect().height()) / 2 );
	textSprite->show();
    }
}

// - - -

KAsteroidsView::~KAsteroidsView()
{
}

// - - -

void KAsteroidsView::reset()
{
    if ( !initialized )
	return;
    rocks.clear();
    missiles.clear();
    bits.clear();
    powerups.clear();
    exhaust.clear();

    shotsFired = 0;
    shotsHit = 0;

    rockSpeed = 1.0;
    powerupSpeed = 1.0;
    mFrameNum = 0;
    mPaused = FALSE;

    ship->hide();
    shield->hide();
/*
    if ( mTimerId >= 0 ) {
	killTimer( mTimerId );
	mTimerId = -1;
    }
*/
}

// - --

void KAsteroidsView::newGame()
{
    if ( !initialized )
	return;
    if ( shieldOn )
    {
      shield->hide();
      shieldOn = FALSE;
    }
    reset();
    if ( mTimerId < 0 )
	mTimerId = startTimer( REFRESH_DELAY );
    emit updateVitals();
}

// - - -

void KAsteroidsView::endGame()
{
}

void KAsteroidsView::pause( bool p )
{
    if ( !initialized )
	return;
    if ( !mPaused && p ) {
	if ( mTimerId >= 0 ) {
	    killTimer( mTimerId );
	    mTimerId = -1;
	}
    } else if ( mPaused && !p )
	mTimerId = startTimer( REFRESH_DELAY );
    mPaused = p;
}

// - - -

void KAsteroidsView::newShip()
{
    if ( !initialized )
	return;
    ship->move( width()/2, height()/2, 0 );
    shield->move( width()/2, height()/2, 0 );
    ship->setVelocity( 0.0, 0.0 );
    shipDx = 0;
    shipDy = 0;
    shipAngle = 0;
    rotateL = FALSE;
    rotateR = FALSE;
    thrustShip = FALSE;
    shootShip = FALSE;
    brakeShip = FALSE;
    teleportShip = FALSE;
    shieldOn = TRUE;
    shootDelay = 0;
    shipPower = MAX_POWER_LEVEL;
    rotateRate = ROTATE_RATE;
    rotateSlow = 0;

    mBrakeCount = 0;
    mTeleportCount = 0;
    mShootCount = 0;

    ship->show();
    shield->show();
    mShieldCount = 1;   // just in case the ship appears on a rock.
    shieldTimer->start( 1000, TRUE );
}

void KAsteroidsView::setShield( bool s )
{
    if ( !initialized )
	return;
    if ( shieldTimer->isActive() && !s ) {
	shieldTimer->stop();
	hideShield();
    } else {
	shieldOn = s && mShieldCount;
    }
}

void KAsteroidsView::brake( bool b )
{
    if ( !initialized )
	return;
    if ( mBrakeCount )
    {
	if ( brakeShip && !b )
	{
	    rotateL = FALSE;
	    rotateR = FALSE;
	    thrustShip = FALSE;
	    rotateRate = ROTATE_RATE;
	}

	brakeShip = b;
    }
}

// - - -

bool KAsteroidsView::readSprites()
{
    QString sprites_prefix = "qasteroids/sprites/";

    int i = 0;
    while ( kas_animations[i].id )
    {
	QCanvasPixmapArray *anim =
	    new QCanvasPixmapArray( sprites_prefix + kas_animations[i].path,
				    kas_animations[i].frames );
	if ( !anim->isValid() )
	    return FALSE;
	animation.insert( kas_animations[i].id, anim );
	i++;
    }

    ship = new QCanvasSprite( animation[ID_SHIP], &field );
    ship->hide();

    shield = new KShield( animation[ID_SHIELD], &field );
    shield->hide();

    return (ship->image(0) && shield->image(0));
}

// - - -

void KAsteroidsView::addRocks( int num )
{
    if ( !initialized )
	return;
    for ( int i = 0; i < num; i++ )
    {
	KRock *rock = new KRock( animation[ID_ROCK_LARGE], &field,
			     ID_ROCK_LARGE, randInt(2), randInt(2) ? -1 : 1 );
	double dx = (2.0 - randDouble()*4.0) * rockSpeed;
	double dy = (2.0 - randDouble()*4.0) * rockSpeed;
	rock->setVelocity( dx, dy );
	rock->setFrame( randInt( rock->frameCount() ) );
	if ( dx > 0 )
	{
	    if ( dy > 0 )
		rock->move( 5, 5, 0 );
	    else
		rock->move( 5, field.height() - 25, 0 );
	}
	else
	{
	    if ( dy > 0 )
		rock->move( field.width() - 25, 5, 0 );
	    else
		rock->move( field.width() - 25, field.height() - 25, 0 );
	}
	rock->show( );
	rocks.append( rock );
    }
}

// - - -

void KAsteroidsView::showText( const QString &text, const QColor &color, bool scroll )
{
    if ( !initialized )
	return;
    textSprite->setText( text );
    textSprite->setColor( color );

    if ( scroll ) {
	textSprite->move( (field.width()-textSprite->boundingRect().width()) / 2,
			    -textSprite->boundingRect().height() );
	textDy = TEXT_SPEED;
    } else {
	textSprite->move( (field.width()-textSprite->boundingRect().width()) / 2,
			  (field.height()-textSprite->boundingRect().height()) / 2 );
	textDy = 0;
    }
    textSprite->show();
}

// - - -

void KAsteroidsView::hideText()
{
    textDy = -TEXT_SPEED;
}

// - - -

void KAsteroidsView::resizeEvent(QResizeEvent* event)
{
    QWidget::resizeEvent(event);
    field.resize(width()-4, height()-4);
    view.resize(width(),height());
}

// - - -

void KAsteroidsView::timerEvent( QTimerEvent * )
{
    field.advance();

    QCanvasSprite *rock;

    // move rocks forward
    for ( rock = rocks.first(); rock; rock = rocks.next() ) {
	((KRock *)rock)->nextFrame();
	wrapSprite( rock );
    }

    wrapSprite( ship );

    // check for missile collision with rocks.
    processMissiles();

    // these are generated when a ship explodes
    for ( KBit *bit = bits.first(); bit; bit = bits.next() )
    {
	if ( bit->expired() )
	{
	    bits.removeRef( bit );
	}
	else
	{
	    bit->growOlder();
	    bit->setFrame( ( bit->frame()+1 ) % bit->frameCount() );
	}
    }

    for ( KExhaust *e = exhaust.first(); e; e = exhaust.next() )
	exhaust.removeRef( e );

    // move / rotate ship.
    // check for collision with a rock.
    processShip();

    // move powerups and check for collision with player and missiles
    processPowerups();

    if ( textSprite->isVisible() )
    {
	if ( textDy < 0 &&
	     textSprite->boundingRect().y() <= -textSprite->boundingRect().height() ) {
	    textSprite->hide();
	} else {
	    textSprite->moveBy( 0, textDy );
	}
	if ( textSprite->boundingRect().y() > (field.height()-textSprite->boundingRect().height())/2 )
	    textDy = 0;
    }

    if ( vitalsChanged && !(mFrameNum % 10) ) {
	emit updateVitals();
	vitalsChanged = FALSE;
    }

    mFrameNum++;
}

void KAsteroidsView::wrapSprite( QCanvasItem *s )
{
    int x = int(s->x() + s->boundingRect().width() / 2);
    int y = int(s->y() + s->boundingRect().height() / 2);

    if ( x > field.width() )
	s->move( s->x() - field.width(), s->y() );
    else if ( x < 0 )
	s->move( field.width() + s->x(), s->y() );

    if ( y > field.height() )
	s->move( s->x(), s->y() - field.height() );
    else if ( y < 0 )
	s->move( s->x(), field.height() + s->y() );
}

// - - -

void KAsteroidsView::rockHit( QCanvasItem *hit )
{
    KPowerup *nPup = 0;
    int rnd = int(randDouble()*30.0) % 30;
    switch( rnd )
    {
      case 4:
      case 5:
	nPup = new KPowerup( animation[ID_ENERGY_POWERUP], &field,
			     ID_ENERGY_POWERUP );
	break;
      case 10:
//        nPup = new KPowerup( animation[ID_TELEPORT_POWERUP], &field,
//                             ID_TELEPORT_POWERUP );
	break;
      case 15:
	nPup = new KPowerup( animation[ID_BRAKE_POWERUP], &field,
				  ID_BRAKE_POWERUP );
	break;
      case 20:
	nPup = new KPowerup( animation[ID_SHIELD_POWERUP], &field,
				  ID_SHIELD_POWERUP );
	break;
      case 24:
      case 25:
	nPup = new KPowerup( animation[ID_SHOOT_POWERUP], &field,
				  ID_SHOOT_POWERUP );