src/GameView.m

   1 /* ----====----====----====----====----====----====----====----====----====----
   2 GameView.m (jeweltoy)
   3
   4 JewelToy is a simple game played against the clock.
   5 Copyright (C) 2001  Giles Williams
   6
   7 This program is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public License
   9 as published by the Free Software Foundation; either version 2
  10 of the License, or (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20 ----====----====----====----====----====----====----====----====----====---- */
  21
  22 //#import <OpenGL/gl.h>
  23 //#import <OpenGL/glu.h>
  24
  25 #import "GameView.h"
  26 #import "GameController.h"
  27 #import "Game.h"
  28 #import "Gem.h"
  29
  30 // MW...
  31 #import "ScoreBubble.h"
  32
  33 #import "OpenGLSprite.h"
  34
  35 #include <math.h>
  36
  37 @implementation GameView
  38
  39 @synthesize animating = _animating;
  40
  41 - (id)initWithFrame:(NSRect)frame {
  42
  43     //NSData    *tiffData;
  44
  45     NSOpenGLPixelFormatAttribute attrs[] = {
  46         NSOpenGLPFADepthSize, 1,
  47         NSOpenGLPFAAccelerated,
  48         0};
  49     NSOpenGLPixelFormat *pixFmt;
  50
  51     pixFmt = [[NSOpenGLPixelFormat alloc] initWithAttributes:attrs];
  52     self = [super initWithFrame:frame pixelFormat:pixFmt];
  53
  54     m_glContextInitialized = NO;
  55
  56     _animating = NO;
  57     showHighScores = NO;
  58     showHint = YES;
  59     ticksSinceLastMove = 0;
  60
  61     docTypeDictionary = [NSDictionary dictionary];
  62
  63     return self;
  64 }
  65
  66 - (void) dealloc
  67 {
  68     if (backgroundColor)
  69         [backgroundColor release];
  70     if (gemImageArray)
  71         [gemImageArray release];
  72     if (gemSpriteArray)
  73         [gemImageArray release];
  74     if (backgroundImagePathArray)
  75         [backgroundImagePathArray release];
  76     [super dealloc];
  77 }
  78
  79 - (void) graphicSetUp
  80 {
  81     int         i;
  82     NSData      *tiffData;
  83
  84     backgroundColor = [[NSColor purpleColor] retain];
  85
  86     [self loadImageArray];
  87
  88         tiffData = [[NSUserDefaults standardUserDefaults]       dataForKey:@"backgroundTiffData"];
  89     if (tiffData)
  90         backgroundImage = [[NSImage alloc] initWithData:tiffData];
  91     else
  92         backgroundImage = [NSImage imageNamed:@"background"];
  93
  94     crosshairImage = [NSImage imageNamed:@"cross"];
  95     movehintImage = [NSImage imageNamed:@"movehint"];
  96
  97     //////
  98     //
  99     // Make the Open GL Sprites!
 100     //
 101     backgroundSprite = [[OpenGLSprite alloc] initWithImage:backgroundImage
 102                                              cropRectangle:NSMakeRect(0.0, 0.0, [backgroundImage size].width, [backgroundImage size].height)
 103                                                       size:NSMakeSize(384.0,384.0)];
 104
 105     crosshairSprite = [[OpenGLSprite alloc] initWithImage:crosshairImage
 106                                             cropRectangle:NSMakeRect(0.0, 0.0, [crosshairImage size].width, [crosshairImage size].height)
 107                                                      size:NSMakeSize(48.0,48.0)];
 108     movehintSprite = [[OpenGLSprite alloc] initWithImage:movehintImage
 109                                            cropRectangle:NSMakeRect(0.0, 0.0, [movehintImage size].width, [movehintImage size].height)
 110                                                     size:NSMakeSize(48.0,48.0)];
 111     if (gemSpriteArray)
 112         [gemSpriteArray release];
 113     gemSpriteArray = [[NSMutableArray arrayWithCapacity:0] retain];
 114     for (i = 0; i < 7; i++)
 115     {
 116         NSImage *image = [gemImageArray objectAtIndex:i];
 117         OpenGLSprite *sprite = [[OpenGLSprite alloc] initWithImage:image
 118                                                      cropRectangle:NSMakeRect(0.0, 0.0, [image size].width, [image size].height)
 119                                                               size:NSMakeSize(48.0,48.0)];
 120
 121         [gemSpriteArray addObject:sprite];
 122         [sprite release];
 123     }
 124
 125     if (!legendImage)
 126     {
 127         legendImage = [[NSImage alloc] initWithSize:NSMakeSize(384,384)];
 128         [legendImage lockFocus];
 129         [[NSColor clearColor] set];
 130         NSRectFill(NSMakeRect(0,0,384,384));
 131         [legendImage unlockFocus];
 132         legendSprite = [[OpenGLSprite alloc] initWithImage:legendImage
 133                                             cropRectangle:NSMakeRect(0.0, 0.0, [legendImage size].width, [legendImage size].height)
 134                                                     size:[legendImage size]];
 135
 136         [self setLegend:[NSImage imageNamed:@"title"]];
 137     }
 138     //
 139     //
 140     //////
 141
 142     // if custom backgrounds are to be used initialise the array of paths to images
 143     //
 144     if ([[NSUserDefaults standardUserDefaults]  boolForKey:@"useCustomBackgrounds"])
 145     {
 146         NSString *customBackgroundFolderPath = [[[NSUserDefaults standardUserDefaults] stringForKey:@"customBackgroundFolderPath"] stringByResolvingSymlinksInPath];
 147
 148         //NSLog(@"customBackgroundFolderPath = ",customBackgroundFolderPath);
 149
 150         if (customBackgroundFolderPath)
 151         {
 152             // borrowed code here
 153             NSDirectoryEnumerator *picturesFolderEnum;
 154             NSString *relativeFilePath,*fullPath;
 155             // grab all picture formats NSImage knows about - we'll assume that if we can read them,
 156             // we can set them to be the desktop picture
 157             NSArray *imageFormats=[NSImage imageFileTypes];
 158
 159             if (backgroundImagePathArray)
 160                 [backgroundImagePathArray autorelease];
 161             backgroundImagePathArray = [[NSMutableArray arrayWithCapacity:0] retain];
 162             // build the array
 163
 164             // borrowed code here
 165             // now we need to go scan the folder chosen, enumerating through to find all picture files
 166             picturesFolderEnum=[[NSFileManager defaultManager] enumeratorAtPath:customBackgroundFolderPath];
 167
 168             relativeFilePath=[picturesFolderEnum nextObject];
 169             while (relativeFilePath)
 170             {
 171                 fullPath=[NSString stringWithFormat:@"%@/%@",customBackgroundFolderPath,relativeFilePath];
 172
 173                 // If the file's extension or type matches a format that NSImage understands,
 174                 // then we're good to go, and we add a new menu item, using the display name
 175                 // (which may have a hidden extension) for the menu item's title and passing
 176                 // the full path to the picture to store with the menu item
 177                 if ([imageFormats containsObject:[relativeFilePath pathExtension]] ||
 178                     [imageFormats containsObject:NSHFSTypeOfFile(fullPath)])
 179                 {
 180                     [backgroundImagePathArray addObject:fullPath];
 181                 }
 182                 relativeFilePath=[picturesFolderEnum nextObject];
 183             }
 184
 185             //NSLog(@"[backgroundImagePathArray count]= %d",[backgroundImagePathArray count]);
 186
 187             //
 188         }
 189
 190     }
 191
 192     [self newBackground];
 193
 194
 195 }
 196
 197 - (void) loadImageArray
 198 {
 199     BOOL        useAlternateGraphics, useImportedGraphics;
 200     useAlternateGraphics = [[NSUserDefaults standardUserDefaults]
 201                                         boolForKey:@"useAlternateGraphics"];
 202     useImportedGraphics = [[NSUserDefaults standardUserDefaults]
 203                                         boolForKey:@"useImportedGraphics"];
 204     if (gemImageArray)
 205         [gemImageArray release];
 206     gemImageArray = [[NSMutableArray arrayWithCapacity:0] retain];
 207     if (!useAlternateGraphics)
 208     {
 209         //NSLog(@"Loading regular graphics");
 210         [gemImageArray addObject:[NSImage imageNamed:@"1gem"]];
 211         [gemImageArray addObject:[NSImage imageNamed:@"2gem"]];
 212         [gemImageArray addObject:[NSImage imageNamed:@"3gem"]];
 213         [gemImageArray addObject:[NSImage imageNamed:@"4gem"]];
 214         [gemImageArray addObject:[NSImage imageNamed:@"5gem"]];
 215         [gemImageArray addObject:[NSImage imageNamed:@"6gem"]];
 216         [gemImageArray addObject:[NSImage imageNamed:@"7gem"]];
 217     }
 218     else
 219     {
 220         //NSData        *tiffData = [[[NSUserDefaults standardUserDefaults]
 221         //                                dataForKey:@"tiffData"] retain];
 222         if (!useImportedGraphics)
 223         {
 224             //NSLog(@"Loading alternate graphics");
 225             [gemImageArray addObject:[NSImage imageNamed:@"1gemA"]];
 226             [gemImageArray addObject:[NSImage imageNamed:@"2gemA"]];
 227             [gemImageArray addObject:[NSImage imageNamed:@"3gemA"]];
 228             [gemImageArray addObject:[NSImage imageNamed:@"4gemA"]];
 229             [gemImageArray addObject:[NSImage imageNamed:@"5gemA"]];
 230             [gemImageArray addObject:[NSImage imageNamed:@"6gemA"]];
 231             [gemImageArray addObject:[NSImage imageNamed:@"7gemA"]];
 232         }
 233         else
 234         {
 235             int i = 0;
 236             //NSLog(@"Loading custom graphics");
 237             for (i = 0; i < 7; i++)
 238             {
 239                 NSString *key = [NSString stringWithFormat:@"tiffGemImage%d", i];
 240                 NSData  *tiffData = [[NSUserDefaults standardUserDefaults]
 241                                         dataForKey:key];
 242                 NSImage *gemImage = [[NSImage alloc] initWithData:tiffData];
 243                 [gemImageArray addObject:gemImage];
 244                 [gemImage release];
 245             }
 246
 247         }
 248     }
 249 }
 250
 251 - (void) setMuted:(BOOL)value
 252 {
 253     muted = value;
 254 }
 255
 256 - (void) setShowHint:(BOOL)value
 257 {
 258     showHint = value;
 259 }
 260
 261 - (void) setPaused:(BOOL)value
 262 {
 263     paused = value;
 264     if (paused)
 265     {
 266         animationStatus = _animating;
 267         _animating = NO;
 268     }
 269     else
 270         _animating = animationStatus;
 271 }
 272
 273 // ANIMATE called by the Timer
 274 - (void) animate
 275 {
 276     if (!paused)
 277     {
 278         //
 279         // MIKE WESSLER'S Scorebubbles
 280         //
 281
 282         //
 283         // needsUpdate added so setNeedsDisplay gets called once at most
 284         //
 285         BOOL needsUpdate = FALSE;
 286
 287         // animate bubbles, if any
 288         for (NSUInteger b = 0; b < [[game scoreBubbles] count]; b++) {
 289             ScoreBubble *sb = [[game scoreBubbles] objectAtIndex:b];
 290             int more = [sb animate];
 291             needsUpdate = TRUE;
 292             if (!more) {
 293                 [[game scoreBubbles] removeObjectAtIndex:b];
 294                 b--;
 295             }
 296         }
 297
 298         if (_animating)
 299         {
 300             //NSLog(@"GameView.animate");
 301             if (game)
 302             {
 303                 int i,j,c;      // animate each gem in the grid
 304                 c = 0;          // animation accumulator
 305                 for (i = 0; i < 8; i++)
 306                     for (j = 0; j < 8; j++)
 307                         if ([game gemAt:i:j])   c += [[game gemAt:i:j] animate];
 308                 if (c == 0)
 309                     [gameController animationEnded];
 310             }
 311             needsUpdate = TRUE;
 312         }
 313         else
 314         {
 315             ticksSinceLastMove++;
 316             if (ticksSinceLastMove > 500)
 317             {
 318                 needsUpdate = TRUE;
 319             }
 320         }
 321         if (needsUpdate)
 322             [self setNeedsDisplay:YES];
 323     }
 324 }
 325
 326 - (void) setGame:(Game *) agame
 327 {
 328     game = agame;
 329 }
 330 - (Game *) game
 331 {
 332     return game;
 333 }
 334 - (NSArray *) imageArray
 335 {
 336     return gemImageArray;
 337 }
 338 - (NSArray *) spriteArray
 339 {
 340     return gemSpriteArray;
 341 }
 342
 343 - (void) newBackground
 344 {
 345     if (([gameController useCustomBackgrounds])&&(backgroundImagePathArray)&&([backgroundImagePathArray count] > 0))
 346     {
 347         NSString *imagePath = [backgroundImagePathArray objectAtIndex:0];
 348         [backgroundImagePathArray addObject:imagePath];
 349         [backgroundImagePathArray removeObjectAtIndex:0];
 350         //NSLog(@"Taking image from path: %@",imagePath);
 351
 352         backgroundImage = [[NSImage alloc] initWithContentsOfFile:imagePath];
 353
 354         //NSLog(@"Image size is %f x %f",[backgroundImage size].width, [backgroundImage size].height);
 355
 356         [backgroundSprite substituteTextureFromImage:backgroundImage];
 357         //backgroundSprite = [[OpenGLSprite alloc] initWithImage:backgroundImage
 358         //                                         cropRectangle:NSMakeRect(0.0, 0.0, [backgroundImage size].width, [backgroundImage size].height)
 359         //                                                 size:NSMakeSize(384.0,384.0)];
 360     }
 361     else
 362     {
 363         NSData *tiffData = [[NSUserDefaults standardUserDefaults]       dataForKey:@"backgroundTiffData"];
 364         if (tiffData)
 365             backgroundImage = [[NSImage alloc] initWithData:tiffData];
 366         else
 367             backgroundImage = [NSImage imageNamed:@"background"];
 368         backgroundSprite = [[OpenGLSprite alloc] initWithImage:backgroundImage
 369                                                  cropRectangle:NSMakeRect(0.0, 0.0, [backgroundImage size].width, [backgroundImage size].height)
 370                                                           size:NSMakeSize(384.0,384.0)];
 371     }
 372 }
 373
 374 - (void) setLegend:(id)value
 375 {
 376     // NEED TO DRAW LEGEND INTO LEGENDIMAGE THEN REPLACE THE TEXTURE IN LEGENDSPRITE
 377
 378     if (!value)         // is null
 379     {
 380         //NSLog(@"Legend cleared");
 381         legend = value;
 382         [self setNeedsDisplay:YES];
 383         return;
 384     }
 385
 386     //
 387     //
 388     [legendImage lockFocus];
 389     [[NSColor clearColor] set];
 390     NSRectFill(NSMakeRect(0,0,384,384));
 391     if ([value isKindOfClass:[NSAttributedString class]])
 392     {
 393         NSPoint legendPoint = NSMakePoint((384 - [value size].width)/2,(384 - [value size].height)/2);
 394         [(NSAttributedString *)value drawAtPoint:legendPoint];
 395     }
 396     if ([value isKindOfClass:[NSImage class]])
 397     {
 398         NSPoint legendPoint = NSMakePoint((384 - [value size].width)/2,(384 - [value size].height)/2);
 399         [(NSImage *)value compositeToPoint:legendPoint operation:NSCompositeSourceOver];
 400     }
 401     [legendImage unlockFocus];
 402     [legendSprite replaceTextureFromImage:legendImage
 403                             cropRectangle:NSMakeRect(0.0, 0.0, [legendImage size].width, [legendImage size].height)];
 404
 405     legend = legendSprite;
 406     ticksSinceLastMove = 0;
 407     showHighScores = NO;
 408     _animating = NO;
 409
 410     [self setNeedsDisplay:YES];
 411
 412     //
 413     //
 414 }
 415
 416 - (void) setHTMLLegend:(NSString *)value
 417 {
 418     NSData              *htmlData = [NSData dataWithBytes:[value UTF8String] length:[value length]];
 419     [self setLegend:[[NSAttributedString alloc] initWithHTML:htmlData documentAttributes:NULL]];
 420 }
 421
 422 - (void) setHiScoreLegend:(NSAttributedString *)value
 423 {
 424     hiScoreLegend = value;
 425 }
 426
 427 - (void) setHTMLHiScoreLegend:(NSString *)value
 428 {
 429     NSData *htmlData = [NSData dataWithBytes:[value UTF8String] length:[value length]];
 430     [self setHiScoreLegend:[[NSAttributedString alloc] initWithHTML:htmlData documentAttributes:NULL]];
 431 }
 432
 433 - (void) setLastMoveDate
 434 {
 435     ticksSinceLastMove = 0;
 436 }
 437
 438 - (void) showHighScores:(NSArray *)scores andNames:(NSArray *)names
 439 {
 440     hiScoreNumbers = scores;
 441     hiScoreNames = names;
 442     showHighScores = YES;
 443     _animating = NO;
 444     scoreScroll = 0;
 445     [self setNeedsDisplay:YES];
 446 }
 447
 448 - (void)drawRect:(NSRect)rect
 449 {
 450   #pragma unused (rect)
 451
 452     int i,j;
 453
 454     // Open GL
 455     float       size = 384.0/2.0;       // screenSize/2;
 456     float       clearDepth = 1.0;
 457
 458     // try to fix image loading problem
 459     if (!legendImage)
 460         [self graphicSetUp];
 461
 462     //////////
 463
 464     if (!m_glContextInitialized)
 465     {
 466         glShadeModel(GL_FLAT);
 467
 468         glMatrixMode(GL_PROJECTION);
 469         glLoadIdentity();       // reset matrix
 470
 471         glFrustum(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);     // set projection matrix
 472         glMatrixMode(GL_MODELVIEW);
 473
 474         //glEnable(GL_DEPTH_TEST);              // depth buffer
 475
 476         glEnable(GL_BLEND);                     // alpha blending
 477         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);              // alpha blending
 478         m_glContextInitialized = YES;
 479     }
 480
 481     glClearColor(0.3, 0.3, 0.3, 0.0);
 482     glClearDepth(clearDepth);
 483     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 484
 485     glLoadIdentity();   // allows me to resize the window but keep position OK
 486
 487     glTranslatef(-1.0,-1.0,0.0);
 488     glScalef(1/size,1/size,1.0);// scale to screen size and width
 489
 490     if (backgroundSprite)
 491     {
 492         [backgroundSprite blitToX:0.0
 493                                 Y:0.0
 494                                 Z:0.0];
 495     }
 496     if ((game)&&(!paused))
 497     {
 498         for (i = 0; i < 8; i++)
 499             for (j = 0; j < 8; j++)
 500                 [[game gemAt:i :j] drawSprite];
 501         //
 502         // MW - Scorebubbles
 503         //
 504         for (i=0; i<[[game scoreBubbles] count]; i++) {
 505             ScoreBubble *sb= [[game scoreBubbles] objectAtIndex:i];
 506             [sb drawSprite];
 507         }
 508         //
 509         ////
 510     }
 511
 512     if (gameController.gameState == GAMESTATE_AWAITINGSECONDCLICK)
 513     {
 514       NSPoint crossHairPosition = gameController.crossHair1Position;
 515
 516         [crosshairSprite blitToX:crossHairPosition.x
 517                                Y:crossHairPosition.y
 518                                Z:-0.5];
 519     }
 520     if (showHighScores)
 521     {
 522         [self showScores];      // draws the HighScores in the current focused view (Quartz)
 523         //return;               // now legendSprite contains the drawing...
 524     }
 525     if (!legend)
 526     {
 527         if ((ticksSinceLastMove > 500)&&(showHint))
 528         {
 529           NSPoint hintPoint = game.hintPoint;
 530             [movehintSprite blitToX:hintPoint.x
 531                                    Y:hintPoint.y
 532                                    Z:-0.4
 533                               Alpha:(sin((ticksSinceLastMove-497.0)/4.0)+1.0)/2.0];
 534         }
 535     }
 536     else
 537     {
 538         if (ticksSinceLastMove > 500)
 539             [self setLegend:[NSImage imageNamed:@"title"]];     // show Logo
 540         if ([legend isKindOfClass:[OpenGLSprite class]])
 541         {
 542             //NSLog(@"Blitting legend");
 543             [legend blitToX:0.0 Y:0.0 Z:-0.75];
 544         }
 545     }
 546     glFlush();
 547
 548 }
 549
 550 - (void) showScores
 551 {
 552     int i;
 553     NSPoint legendPoint;
 554     NSRect panelRect;
 555     NSMutableDictionary *attr = [NSMutableDictionary dictionaryWithCapacity:0];
 556
 557     [attr setObject:[NSColor yellowColor] forKey:NSForegroundColorAttributeName];
 558
 559     [legendImage lockFocus];
 560     [[NSColor clearColor] set];
 561     NSRectFill(NSMakeRect(0,0,384,384));
 562
 563     [[NSColor colorWithCalibratedRed:0.0 green:0.0 blue:0.0 alpha:0.5] set];
 564     panelRect = NSMakeRect(32, 16, 384-64, 384-32);
 565     NSRectFill(panelRect);
 566
 567
 568     legendPoint = NSMakePoint((384 - [hiScoreLegend size].width)/2,384 - [hiScoreLegend size].height*1.5 + scoreScroll);
 569
 570     [hiScoreLegend drawAtPoint:legendPoint];
 571
 572     for (i = 0; i< 10; i++)
 573     {
 574         NSString *s1 = [NSString stringWithFormat:@"%d",[[hiScoreNumbers objectAtIndex:i] intValue]];
 575         NSString *s2 = [hiScoreNames objectAtIndex:i];
 576         NSPoint q1 = NSMakePoint( 192+20+1, 384 - 84 - i*30 + scoreScroll - 1);
 577         NSPoint q2 = NSMakePoint( 192-20-[s2 sizeWithAttributes:attr].width+1, 384 - 84 - i*30 + scoreScroll - 1);
 578         NSPoint p1 = NSMakePoint( 192+20, 384 - 84 - i*30 + scoreScroll);
 579         NSPoint p2 = NSMakePoint( 192-20-[s2 sizeWithAttributes:attr].width, 384 - 84 - i*30 + scoreScroll);
 580
 581         [attr setObject:[NSColor blackColor] forKey:NSForegroundColorAttributeName];
 582
 583         [s1 drawAtPoint:q1 withAttributes:attr];
 584         [s2 drawAtPoint:q2 withAttributes:attr];
 585
 586         [attr setObject:[NSColor yellowColor] forKey:NSForegroundColorAttributeName];
 587
 588         [s1 drawAtPoint:p1 withAttributes:attr];
 589         [s2 drawAtPoint:p2 withAttributes:attr];
 590     }
 591     [legendImage unlockFocus];
 592     [legendSprite replaceTextureFromImage:legendImage
 593                             cropRectangle:NSMakeRect(0.0, 0.0, [legendImage size].width, [legendImage size].height)];
 594
 595     legend = legendSprite;
 596
 597     showHighScores = NO;
 598 }
 599
 600 - (BOOL)isOpaque {
 601   return YES;
 602 }
 603
 604 /* I want to add a new behaviour here, the click-drag for a square
 605  * I'm prolly going to have to fake this by sending gameController two clicks
 606  * I might have to change the shape of the mouse cursor too!
 607  */
 608 - (void)mouseDown:(NSEvent *)event {
 609     NSPoint eventLocation = [event locationInWindow];
 610     NSPoint center = [self convertPoint:eventLocation fromView:nil];
 611     dragStartPoint = center;
 612 }
 613
 614 - (void)mouseDragged:(NSEvent *)event
 615 {
 616   #pragma unused (event)
 617   // do nothing for now
 618 }
 619
 620 - (void)mouseUp:(NSEvent *)event
 621 {
 622     NSPoint eventLocation = [event locationInWindow];
 623     NSPoint center = [self convertPoint:eventLocation fromView:nil];
 624
 625     // check situation - is this a first or second mouseUp
 626     if (gameController.gameState == GAMESTATE_AWAITINGSECONDCLICK)
 627     {
 628         //NSLog(@"click at :%f,%f",center.x,center.y);
 629         [gameController receiveClickAt:center.x:center.y];
 630     }
 631     else if (gameController.gameState == GAMESTATE_AWAITINGFIRSTCLICK)
 632     {
 633         int chx1 = floor(dragStartPoint.x / 48);
 634         int chy1 = floor(dragStartPoint.y / 48);
 635         int chx2 = floor(center.x / 48);
 636         int chy2 = floor(center.y / 48);
 637
 638       // ???: WTF, you don't really xor booleans...
 639         if ((chx2 != chx1)^(chy2 != chy1))      // xor checks if a valid shove's occurred!
 640         {
 641             [gameController receiveClickAt:dragStartPoint.x:dragStartPoint.y];
 642             [gameController receiveClickAt:center.x:center.y];
 643         }
 644         else {
 645             [gameController receiveClickAt:center.x:center.y];
 646         }
 647     }
 648
 649 }
 650
 651 @end