ConnectionItem.cpp

   1 #include "ConnectionItem.h"
   2
   3 #include "Dispatcher.h"
   4 #include "Parameters.h"
   5 #include "AbstractBoxItem.h"
   6 #include "ConnectedInterface.h"
   7 #include "InterfaceItem.h"
   8 #include "AbstractBlock.h"
   9
  10 //int ConnectionItem::counter = 0;
  11
  12 ConnectionItem::ConnectionItem(InterfaceItem* _iface1,
  13                                InterfaceItem* _iface2,
  14                                Dispatcher* _dispatcher,
  15                                Parameters* _params) : QGraphicsItem() {
  16
  17
  18   dispatcher = _dispatcher;
  19   params = _params;
  20
  21   ConnectedInterface* ref1 = _iface1->refInter;
  22   ConnectedInterface* ref2 = _iface2->refInter;
  23   /* ref. note in .h
  24      case 1 : ref1 is group interface, and ref2 block interface of a block within the group
  25      case 2 : the opposite of case 1
  26      case 3 : ref1 and ref2 are block interface of blocks that are both within the same parent group.
  27      case 4 : ref1 is source interface and ref2 interface of top group
  28      case 5 : the opposite of case 4
  29    */
  30   if (ref1->getOwner() == ref2->getOwner()->getParent()) {
  31
  32     if (ref1->getDirection() == AbstractInterface::Input) {
  33       fromInterfaceItem = _iface1;
  34       toInterfaceItem = _iface2;
  35     }
  36     else if (ref1->getDirection() == AbstractInterface::InOut) {
  37       fromInterfaceItem = _iface1;
  38       toInterfaceItem = _iface2;
  39     }
  40     else if (ref1->getDirection() == AbstractInterface::Output) {
  41       toInterfaceItem = _iface1;
  42       fromInterfaceItem = _iface2;
  43     }
  44   }
  45   else if (ref1->getOwner()->getParent() == ref2->getOwner()) {
  46
  47     if (ref1->getDirection() == AbstractInterface::Input) {
  48       fromInterfaceItem = _iface2;
  49       toInterfaceItem = _iface1;
  50     }
  51     else if (ref1->getDirection() == AbstractInterface::InOut) {
  52       fromInterfaceItem = _iface2;
  53       toInterfaceItem = _iface1;
  54     }
  55     else if (ref1->getDirection() == AbstractInterface::Output) {
  56       toInterfaceItem = _iface2;
  57       fromInterfaceItem = _iface1;
  58     }
  59   }
  60   // NB : this case is in fact similar to the previous. Kept here for clarity
  61   else if (ref1->getOwner()->getParent() == ref2->getOwner()->getParent()) {
  62
  63     if (ref1->getDirection() == AbstractInterface::Input) {
  64       fromInterfaceItem = _iface2;
  65       toInterfaceItem = _iface1;
  66     }
  67     else if (ref1->getDirection() == AbstractInterface::InOut) {
  68       fromInterfaceItem = _iface2;
  69       toInterfaceItem = _iface1;
  70     }
  71     else if (ref1->getDirection() == AbstractInterface::Output) {
  72       toInterfaceItem = _iface2;
  73       fromInterfaceItem = _iface1;
  74     }
  75   }
  76   else if ((ref1->getOwner()->isSourceBlock()) && (ref2->getOwner()->isTopGroupBlock())) {
  77     fromInterfaceItem = _iface1;
  78     toInterfaceItem = _iface2;
  79   }
  80   else if ((ref2->getOwner()->isSourceBlock()) && (ref1->getOwner()->isTopGroupBlock())) {
  81     fromInterfaceItem = _iface2;
  82     toInterfaceItem = _iface1;
  83   }
  84   // adding this to interface items
  85   fromInterfaceItem->addConnectionItem(this);
  86   toInterfaceItem->addConnectionItem(this);
  87
  88   selected = false;
  89   marginConn = params->arrowLineLength+params->arrowWidth;
  90
  91   setFlag(ItemIsSelectable);
  92   setAcceptHoverEvents(true);
  93   setFlag(ItemSendsGeometryChanges);
  94   setCursor(Qt::PointingHandCursor);
  95   setZValue(200);
  96
  97   if (fromInterfaceItem->refInter->getPurpose() == AbstractInterface::Data) {
  98     visible = true;
  99   }
 100   else {
 101     visible = false;
 102   }
 103
 104   setPath();
 105 }
 106
 107
 108 ConnectionItem::ConnectionItem(const ConnectionItem &copy) {
 109   pointFrom = copy.pointFrom;
 110   pointTo = copy.pointTo;
 111   interPoint1 = copy.interPoint1;
 112   interPoint2 = copy.interPoint2;
 113   interPoint3 = copy.interPoint3;
 114   interPoint4 = copy.interPoint4;
 115 }
 116
 117 ConnectionItem::~ConnectionItem() {
 118 }
 119
 120 ConnectionItem::ConnectionItem() {
 121 }
 122
 123 QPainterPath ConnectionItem::shape() const {
 124   return pathShape;
 125 }
 126
 127 QRectF ConnectionItem::boundingRect() const {
 128
 129   QPointF start, end;
 130
 131   if(pointFrom.x() < pointTo.x()){
 132     start.setX(pointFrom.x()-20);
 133     end.setX(pointTo.x()+20);
 134   } else {
 135     start.setX(pointTo.x()-20);
 136     end.setX(pointFrom.x()+20);
 137   }
 138   if(pointFrom.y() < pointTo.y()){
 139     start.setY(pointFrom.y()-20);
 140     end.setY(pointTo.y()+20);
 141   } else {
 142     start.setY(pointTo.y()-20);
 143     end.setY(pointFrom.y()+20);
 144   }
 145   return QRectF(start, end);
 146 }
 147
 148 void ConnectionItem::paint(QPainter *painter,
 149                            const QStyleOptionGraphicsItem *option,
 150                            QWidget *widget) {
 151
 152   if (!visible) return;
 153
 154   painter->setPen(Qt::blue);
 155   if(selected){
 156     painter->setPen(Qt::red);
 157   }
 158
 159   painter->drawPath(pathPaint);
 160 }
 161
 162 void ConnectionItem::addInterPoint(QPointF point) {
 163
 164 }
 165
 166 void ConnectionItem::setPath() {
 167
 168   // signals to the scene that this connection is going to change of shape.
 169   prepareGeometryChange();
 170
 171   bool withinGroup = false;
 172   /* NB: four cases
 173      1: from group input iface to box input iface
 174      2: from output box iface to group output iface
 175      3: from output box iface to input box iface
 176      4: from source output iface to input group iface
 177
 178     For cases 1 & 2, the position of group iface is given by getStartPosition
 179     For all other cases, the iface from and to position is given by getEndPosition
 180    */
 181   if ((fromInterfaceItem->getOwner()->isGroupItem()) && (toInterfaceItem->getOwner()->isBoxItem())) {
 182     pointFrom = fromInterfaceItem->getStartPosition();
 183     pointTo = toInterfaceItem->getEndPosition();
 184     withinGroup = true;
 185   }
 186   else if ((toInterfaceItem->getOwner()->isGroupItem()) && (fromInterfaceItem->getOwner()->isBoxItem())) {
 187     pointFrom = fromInterfaceItem->getEndPosition();
 188     pointTo = toInterfaceItem->getStartPosition();
 189     withinGroup = true;
 190   }
 191   else {
 192     pointFrom = fromInterfaceItem->getEndPosition();
 193     pointTo = toInterfaceItem->getEndPosition();
 194   }
 195
 196   int oriFrom, oriTo;
 197   oriFrom = fromInterfaceItem->getOrientation();
 198   oriTo = toInterfaceItem->getOrientation();
 199
 200 /* NB: if src or dest is onwed by a GroupItem the orientation
 201    must be changed as it is a block.
 202  */
 203   if (withinGroup) {
 204     if(fromInterfaceItem->owner->isGroupItem()){
 205       switch(fromInterfaceItem->getOrientation()){
 206       case Parameters::North :
 207         oriFrom = Parameters::South;
 208         break;
 209       case Parameters::South :
 210         oriFrom = Parameters::North;
 211         break;
 212       case Parameters::East :
 213         oriFrom = Parameters::West;
 214         break;
 215       case Parameters::West :
 216         oriFrom = Parameters::East;
 217         break;
 218       }
 219     }
 220     else if(toInterfaceItem->owner->isGroupItem()){
 221       switch(toInterfaceItem->getOrientation()){
 222       case Parameters::North :
 223         oriTo = Parameters::South;
 224         break;
 225       case Parameters::South :
 226         oriTo = Parameters::North;
 227         break;
 228       case Parameters::East :
 229         oriTo = Parameters::West;
 230         break;
 231       case Parameters::West :
 232         oriTo = Parameters::East;
 233         break;
 234       }
 235     }
 236   }
 237   double gap1 = 0.0;
 238   double gap2 = 0.0;
 239
 240   if(oriFrom == Parameters::South) {
 241
 242     // FROM SOUTH TO SOUTH
 243     if(oriTo == Parameters::South) {
 244       computeElle(oriFrom);
 245     }
 246     // FROM SOUTH TO NORTH
 247     else if(oriTo == Parameters::North) {
 248       gap1 = pointTo.y() - pointFrom.y();
 249       if (gap1 > 2*marginConn) {
 250         computeStaircase(oriFrom);
 251       }
 252       else {
 253         computeEsse(oriFrom);
 254       }
 255     }
 256     // FROM SOUTH TO EAST OR WEST
 257     else if ((oriTo == Parameters::East) || (oriTo == Parameters::West)){
 258
 259       gap1 = pointTo.x() - pointFrom.x();
 260       if (oriTo == Parameters::West) gap1 = -gap1;
 261       gap2 = pointTo.y() - pointFrom.y();
 262
 263       if (gap1 > 0.0) {
 264         if (gap2 > 0.0) {
 265           computeHookSmallEnd(oriFrom,oriTo);
 266         }
 267         else {
 268           computeOpenRect(oriFrom,oriTo);
 269         }
 270       }
 271       else {
 272         if (gap2 >= 0.0) {
 273           computeCorner(oriFrom);
 274         }
 275         else {
 276           computeHookSmallStart(oriFrom,oriTo);
 277         }
 278       }
 279     }
 280   }
 281   else if(oriFrom == Parameters::North) {
 282
 283     // FROM NORTH TO SOUTH
 284     if(oriTo == Parameters::South) {
 285       gap1 = pointFrom.y() - pointTo.y();
 286       if (gap1 > 2*marginConn) {
 287         computeStaircase(oriFrom);
 288       }
 289       else {
 290         computeEsse(oriFrom);
 291       }
 292     }
 293     // FROM NORTH TO NORTH
 294     else if(oriTo == Parameters::North) {
 295       computeElle(oriFrom);
 296     }
 297     // FROM NORTH TO EAST OR WEST
 298     else if ((oriTo == Parameters::East) || (oriTo == Parameters::West)){
 299
 300       gap1 = pointTo.x() - pointFrom.x();
 301       if (oriTo == Parameters::West) gap1 = -gap1;
 302       gap2 = pointFrom.y() - pointTo.y();
 303
 304       if (gap1 > 0.0) {
 305         if (gap2 > 0.0) {
 306           computeHookSmallEnd(oriFrom,oriTo);
 307         }
 308         else {
 309           computeOpenRect(oriFrom,oriTo);
 310         }
 311       }
 312       else {
 313         if (gap2 >= 0.0) {
 314           computeCorner(oriFrom);
 315         }
 316         else {
 317           computeHookSmallStart(oriFrom,oriTo);
 318         }
 319       }
 320     }
 321   }
 322   else if(oriFrom == Parameters::East) {
 323     // FROM EAST TO NORTH OR SOUTH
 324     if ((oriTo == Parameters::South) || (oriTo == Parameters::North)){
 325
 326       gap1 = pointFrom.x() - pointTo.x();
 327       gap2 = pointFrom.y() - pointTo.y();
 328       if (oriTo == Parameters::North) gap2 = -gap2;
 329
 330       if (gap1 > 0.0) {
 331         if (gap2 > 0.0) {
 332           computeHookSmallStart(oriFrom,oriTo);
 333         }
 334         else {
 335           computeOpenRect(oriFrom,oriTo);
 336         }
 337       }
 338       else {
 339         if (gap2 >= 0.0) {
 340           computeCorner(oriFrom);
 341         }
 342         else {
 343           computeHookSmallEnd(oriFrom,oriTo);
 344         }
 345       }
 346     }
 347     else if(oriTo == Parameters::East) {
 348       computeElle(oriFrom);
 349     }
 350     else if (oriTo == Parameters::West) {
 351       gap1 = pointTo.x() - pointFrom.x();
 352       if (gap1 > 2*marginConn) {
 353         computeStaircase(oriFrom);
 354       }
 355       else {
 356         computeEsse(oriFrom);
 357       }
 358     }
 359   }
 360   else if (oriFrom == Parameters::West) {
 361
 362     // FROM WEST TO NORTH OR SOUTH
 363     if ((oriTo == Parameters::South) || (oriTo == Parameters::North)){
 364
 365       gap1 = pointTo.x() - pointFrom.x();
 366       gap2 = pointFrom.y() - pointTo.y();
 367       if (oriTo == Parameters::North) gap2 = -gap2;
 368
 369       if (gap1 > 0.0) {
 370         if (gap2 > 0.0) {
 371           computeHookSmallStart(oriFrom,oriTo);
 372         }
 373         else {
 374           computeOpenRect(oriFrom,oriTo);
 375         }
 376       }
 377       else {
 378         if (gap2 >= 0.0) {
 379           computeCorner(oriFrom);
 380         }
 381         else {
 382           computeHookSmallEnd(oriFrom,oriTo);
 383         }
 384       }
 385     }
 386     else if(oriTo == Parameters::East) {
 387       gap1 = pointFrom.x() - pointTo.x();
 388       if (gap1 > 2*marginConn) {
 389         computeStaircase(oriFrom);
 390       }
 391       else {
 392         computeEsse(oriFrom);
 393       }
 394     }
 395     else if (oriTo == Parameters::West) {
 396       computeElle(oriFrom);
 397     }
 398   }
 399
 400   //pps.setWidth(5);
 401   //pathShape = pps.createStroke(pathPaint);
 402 }
 403
 404
 405 void ConnectionItem::computeEsse(int orientationFrom) {
 406
 407   //cout << "drawing an esse" << endl;
 408   pathPaint = QPainterPath(pointFrom);
 409   QPainterPath s;
 410   interPoints.clear();
 411   double gap = marginConn;
 412
 413   if ((orientationFrom == Parameters::North)||(orientationFrom == Parameters::West)) gap = -gap;
 414   QPointF p(0.0,0.0);
 415
 416   if ((orientationFrom == Parameters::East)||(orientationFrom == Parameters::West)) {
 417
 418     // must draw a complete esse
 419     p = QPointF(pointFrom.x()+gap,pointFrom.y());
 420     s.moveTo(p);
 421     pathPaint.lineTo(p);
 422     interPoints.append(p);
 423     p = QPointF(pointFrom.x()+gap,(pointFrom.y()+pointTo.y())/2.0);
 424     pathPaint.lineTo(p);
 425     s.lineTo(p);
 426     interPoints.append(p);
 427     p = QPointF(pointTo.x()-gap,(pointFrom.y()+pointTo.y())/2.0);
 428     pathPaint.lineTo(p);
 429     s.lineTo(p);
 430     interPoints.append(p);
 431     p = QPointF(pointTo.x()-gap,pointTo.y());
 432     pathPaint.lineTo(p);
 433     s.lineTo(p);
 434     interPoints.append(p);
 435     pathPaint.lineTo(pointTo);
 436   }
 437   else if ((orientationFrom == Parameters::South)||(orientationFrom == Parameters::North)) {
 438
 439     // must draw a complete esse
 440     p = QPointF(pointFrom.x(),pointFrom.y()+gap);
 441     pathPaint.lineTo(p);
 442     s.moveTo(p);
 443     interPoints.append(p);
 444     p = QPointF((pointFrom.x()+pointTo.x())/2.0,pointFrom.y()+gap);
 445     pathPaint.lineTo(p);
 446     s.lineTo(p);
 447     interPoints.append(p);
 448     p = QPointF((pointFrom.x()+pointTo.x())/2.0,pointTo.y()-gap);
 449     pathPaint.lineTo(p);
 450     s.lineTo(p);
 451     interPoints.append(p);
 452     p = QPointF(pointTo.x(), pointTo.y()-gap);
 453     pathPaint.lineTo(p);
 454     s.lineTo(p);
 455     interPoints.append(p);
 456     pathPaint.lineTo(pointTo);
 457   }
 458   pps.setWidth(5);
 459   pathShape = pps.createStroke(s);
 460 }
 461
 462 void ConnectionItem::computeStaircase(int orientationFrom) {
 463
 464   pathPaint = QPainterPath(pointFrom);
 465   QPainterPath s;
 466   double gap = marginConn;
 467   interPoints.clear();
 468   QPointF p(0.0,0.0);
 469
 470   if ((orientationFrom == Parameters::East)||(orientationFrom == Parameters::West)) {
 471
 472     if (orientationFrom == Parameters::West) gap = -gap;
 473     p = QPointF(pointFrom.x()+gap,pointFrom.y());
 474     s.moveTo(p);
 475
 476     if (pointFrom.y() == pointTo.y()) {
 477       //cout << "drawing straight line" << endl;
 478       pathPaint.lineTo(pointTo);
 479
 480     }
 481     else  {
 482       //cout << "drawing a staircase" << endl;
 483       // sufficient place to draw a simple staircase
 484       p = QPointF((pointFrom.x()+pointTo.x())/2.0,pointFrom.y());
 485       pathPaint.lineTo(p);
 486       s.lineTo(p);
 487       interPoints.append(p);
 488       p = QPointF((pointFrom.x()+pointTo.x())/2.0,pointTo.y());
 489       pathPaint.lineTo(p);
 490       s.lineTo(p);
 491       interPoints.append(p);
 492       pathPaint.lineTo(pointTo);
 493     }
 494     p = QPointF(pointTo.x()-gap,pointTo.y());
 495     s.lineTo(p);
 496   }
 497   else if ((orientationFrom == Parameters::South)||(orientationFrom == Parameters::North)) {
 498
 499     if (orientationFrom == Parameters::North) gap = -gap;
 500
 501     p = QPointF(pointFrom.x(),pointFrom.y()+gap);
 502     s.moveTo(p);
 503
 504     if (pointFrom.x() == pointTo.x()) {
 505       //cout << "drawing straight line" << endl;
 506       pathPaint.lineTo(pointTo);
 507     }
 508     else {
 509       //cout << "drawing a staircase" << endl;
 510       // sufficient place to draw a simple staircase
 511       p = QPointF(pointFrom.x(),(pointFrom.y()+pointTo.y())/2.0);
 512       pathPaint.lineTo(p);
 513       s.lineTo(p);
 514       interPoints.append(p);
 515       p = QPointF(pointTo.x(),(pointFrom.y()+pointTo.y())/2.0);
 516       pathPaint.lineTo(p);
 517       s.lineTo(p);
 518       interPoints.append(p);
 519       pathPaint.lineTo(pointTo);
 520     }
 521     p = QPointF(pointTo.x(),pointTo.y()-gap);
 522     s.lineTo(p);
 523   }
 524   pps.setWidth(5);
 525   pathShape = pps.createStroke(s);
 526 }
 527
 528 /* drawCorner():
 529
 530   A Corner has the following shape :
 531   |
 532   |__
 533
 534 */
 535 void ConnectionItem::computeCorner(int orientationFrom) {
 536
 537   pathPaint = QPainterPath(pointFrom);
 538   interPoints.clear();
 539   QPointF p(0.0,0.0);
 540   QPainterPath s;
 541   double gap = marginConn;
 542
 543   //cout << "drawing a corner" << endl;
 544
 545   if ((orientationFrom == Parameters::East)||(orientationFrom == Parameters::West)) {
 546     if (orientationFrom == Parameters::West) gap = -gap;
 547     p = QPointF(pointFrom.x()+gap,pointFrom.y());
 548     s.moveTo(p);
 549     p = QPointF(pointTo.x(),pointFrom.y());
 550     pathPaint.lineTo(p);
 551     s.lineTo(p);
 552     interPoints.append(p);
 553     pathPaint.lineTo(pointTo);
 554     p = QPointF(pointTo.x(),pointTo.y()-gap);
 555     s.lineTo(p);
 556   }
 557   else if ((orientationFrom == Parameters::South)||(orientationFrom == Parameters::North)) {
 558     if (orientationFrom == Parameters::North) gap = -gap;
 559     p = QPointF(pointFrom.x(),pointFrom.y()+gap);
 560     s.moveTo(p);
 561     p = QPointF(pointFrom.x(),pointTo.y());
 562     pathPaint.lineTo(p);
 563     s.lineTo(p);
 564     interPoints.append(p);
 565     pathPaint.lineTo(pointTo);
 566     p = QPointF(pointTo.x()-gap,pointTo.y());
 567     s.lineTo(p);
 568   }
 569   pps.setWidth(5);
 570   pathShape = pps.createStroke(s);
 571 }
 572
 573 /* drawOpenRect():
 574
 575   A OpenRect has the following shape :
 576   __
 577   |
 578   |_|
 579
 580   Its beginning and end have always a size of marginConn
 581 */
 582 void ConnectionItem::computeOpenRect(int orientationFrom, int orientationTo) {
 583   pathPaint = QPainterPath(pointFrom);
 584   interPoints.clear();
 585   QPointF p(0.0,0.0);
 586   double gap1 = marginConn;
 587   double gap2 = marginConn;
 588   QPainterPath s;
 589   //cout << "drawing an OpenRect" << endl;
 590
 591   if ((orientationFrom == Parameters::East)||(orientationFrom == Parameters::West)) {
 592     if (orientationFrom == Parameters::West) {
 593       gap1 = -gap1;
 594     }
 595     if (orientationTo == Parameters::North) {
 596       gap2 = -gap2;
 597     }
 598     p = QPointF(pointFrom.x()+gap1,pointFrom.y());
 599     pathPaint.lineTo(p);
 600     s.moveTo(p);
 601     interPoints.append(p);
 602     p = QPointF(pointFrom.x()+gap1,pointTo.y()+gap2);
 603     pathPaint.lineTo(p);
 604     s.lineTo(p);
 605     interPoints.append(p);
 606     p = QPointF(pointTo.x(),pointTo.y()+gap2);
 607     pathPaint.lineTo(p);
 608     s.lineTo(p);
 609     interPoints.append(p);
 610     pathPaint.lineTo(pointTo);
 611
 612   }
 613   else if ((orientationFrom == Parameters::South)||(orientationFrom == Parameters::North)) {
 614     if (orientationFrom == Parameters::North) {
 615       gap1 = -gap1;
 616     }
 617     if (orientationTo == Parameters::West) {
 618       gap2 = -gap2;
 619     }
 620     p = QPointF(pointFrom.x(),pointFrom.y()+gap1);
 621     pathPaint.lineTo(p);
 622     s.moveTo(p);
 623     interPoints.append(p);
 624     p = QPointF(pointTo.x()+gap2,pointFrom.y()+gap1);
 625     pathPaint.lineTo(p);
 626     s.lineTo(p);
 627     interPoints.append(p);
 628     p = QPointF(pointTo.x()+gap2,pointTo.y());
 629     pathPaint.lineTo(p);
 630     s.lineTo(p);
 631     interPoints.append(p);
 632     pathPaint.lineTo(pointTo);
 633   }
 634   pps.setWidth(5);
 635   pathShape = pps.createStroke(s);
 636 }
 637
 638
 639 /* drawHookSmallEnd():
 640
 641   A Hook has the following shape :
 642   _
 643    |
 644    |_|
 645    Its end has always a size of marginConn
 646 */
 647 void ConnectionItem::computeHookSmallEnd(int orientationFrom, int orientationTo) {
 648   pathPaint = QPainterPath(pointFrom);
 649   interPoints.clear();
 650   QPointF p(0.0,0.0);
 651   QPainterPath s;
 652   double gap2 = marginConn;
 653   double gap1 = marginConn;
 654   //cout << "drawing a Hook with small end" << endl;
 655
 656   if ((orientationFrom == Parameters::East)||(orientationFrom == Parameters::West)) {
 657
 658     if (orientationFrom == Parameters::West) gap1 = -gap1;
 659     if (orientationTo == Parameters::North) gap2 = -gap2;
 660
 661     p = QPointF(pointFrom.x()+gap1,pointFrom.y());
 662     s.moveTo(p);
 663     p = QPointF((pointFrom.x()+pointTo.x())/2.0,pointFrom.y());
 664     pathPaint.lineTo(p);
 665     s.lineTo(p);
 666     interPoints.append(p);
 667     p = QPointF((pointFrom.x()+pointTo.x())/2.0,pointTo.y()+gap2);
 668     pathPaint.lineTo(p);
 669     s.lineTo(p);
 670     interPoints.append(p);
 671     p = QPointF(pointTo.x(),pointTo.y()+gap2);
 672     pathPaint.lineTo(p);
 673     s.lineTo(p);
 674     interPoints.append(p);
 675     pathPaint.lineTo(pointTo);
 676
 677   }
 678   else if ((orientationFrom == Parameters::South)||(orientationFrom == Parameters::North)) {
 679
 680     if (orientationFrom == Parameters::North) gap1 = -gap1;
 681     if (orientationTo == Parameters::West) gap2 = -gap2;
 682
 683     p = QPointF(pointFrom.x(),pointFrom.y()+gap1);
 684     s.moveTo(p);
 685     p = QPointF(pointFrom.x(),(pointFrom.y()+pointTo.y())/2.0);
 686     pathPaint.lineTo(p);
 687     s.lineTo(p);
 688     interPoints.append(p);
 689     p = QPointF(pointTo.x()+gap2,(pointFrom.y()+pointTo.y())/2.0);
 690     pathPaint.lineTo(p);
 691     s.lineTo(p);
 692     interPoints.append(p);
 693     p = QPointF(pointTo.x()+gap2,pointTo.y());
 694     pathPaint.lineTo(p);
 695     s.lineTo(p);
 696     interPoints.append(p);
 697     pathPaint.lineTo(pointTo);
 698   }
 699   pps.setWidth(5);
 700   pathShape = pps.createStroke(s);
 701 }
 702
 703 /* drawHookSmallStart():
 704
 705   A Hook has the following shape :
 706   _
 707    |
 708    |_|
 709    Its start has always a size of marginConn
 710 */
 711 void ConnectionItem::computeHookSmallStart(int orientationFrom, int orientationTo) {
 712   pathPaint = QPainterPath(pointFrom);
 713   interPoints.clear();
 714   QPointF p(0.0,0.0);
 715   QPainterPath s;
 716   double gap1 = marginConn;
 717   double gap2 = marginConn;
 718   //cout << "drawing a Hook with small start" << endl;
 719
 720   if ((orientationFrom == Parameters::East)||(orientationFrom == Parameters::West)) {
 721
 722     if (orientationFrom == Parameters::West) gap1 = -gap1;
 723     if (orientationTo == Parameters::North) gap2 = -gap2;
 724
 725     p = QPointF(pointFrom.x()+gap1,pointFrom.y());
 726     s.moveTo(p);
 727     pathPaint.lineTo(p);
 728     interPoints.append(p);
 729     p = QPointF(pointFrom.x()+gap1,(pointFrom.y()+pointTo.y())/2.0);
 730     pathPaint.lineTo(p);
 731     s.lineTo(p);
 732     interPoints.append(p);
 733     p = QPointF(pointTo.x(),(pointFrom.y()+pointTo.y())/2.0);
 734     pathPaint.lineTo(p);
 735     s.lineTo(p);
 736     interPoints.append(p);
 737     pathPaint.lineTo(pointTo);
 738     p = QPointF(pointTo.x(),pointFrom.y()+gap2);
 739     s.lineTo(p);
 740   }
 741   else if ((orientationFrom == Parameters::South)||(orientationFrom == Parameters::North)) {
 742
 743     if (orientationFrom == Parameters::North) gap1 = -gap1;
 744     if (orientationTo == Parameters::West) gap2 = -gap2;
 745
 746     p = QPointF(pointFrom.x(),pointFrom.y()+gap1);
 747     s.moveTo(p);
 748     pathPaint.lineTo(p);
 749     interPoints.append(p);
 750     p = QPointF((pointFrom.x()+pointTo.x())/2.0,pointFrom.y()+gap1);
 751     pathPaint.lineTo(p);
 752     s.lineTo(p);
 753     interPoints.append(p);
 754     p = QPointF((pointFrom.x()+pointTo.x())/2.0,pointTo.y());
 755     pathPaint.lineTo(p);
 756     s.lineTo(p);
 757     interPoints.append(p);
 758     pathPaint.lineTo(pointTo);
 759     p = QPointF(pointTo.x()+gap2,pointFrom.y());
 760     s.lineTo(p);
 761   }
 762   pps.setWidth(5);
 763   pathShape = pps.createStroke(s);
 764 }
 765
 766 /* drawElle():
 767
 768   An Elle has the following shape :
 769   |
 770   |_|
 771
 772 */
 773 void ConnectionItem::computeElle(int orientationFrom) {
 774
 775   pathPaint = QPainterPath(pointFrom);
 776   interPoints.clear();
 777   QPointF p(0.0,0.0);
 778   QPainterPath s;
 779   double gap = marginConn;
 780
 781   double x;
 782   double y;
 783   if ((orientationFrom == Parameters::North) || (orientationFrom == Parameters::South)) {
 784     double diffPos = pointFrom.y() - pointTo.y();
 785     if (orientationFrom == Parameters::North) {
 786       gap = -gap;
 787       diffPos = -diffPos;
 788     }
 789     p = QPointF(pointFrom.x(),pointFrom.y()+gap);
 790     s.moveTo(p);
 791     if (diffPos >= 0.0) {
 792       pathPaint.lineTo(p);
 793       interPoints.append(p);
 794       p = QPointF(pointTo.x(),pointFrom.y()+gap);
 795       pathPaint.lineTo(p);
 796       s.lineTo(p);
 797       interPoints.append(p);
 798       pathPaint.lineTo(pointTo);
 799       p = QPointF(pointTo.x(),pointTo.y()+gap);
 800       s.lineTo(p);
 801     }
 802     else {
 803       p = QPointF(pointFrom.x(),pointTo.y()+gap);
 804       pathPaint.lineTo(p);
 805       s.lineTo(p);
 806       interPoints.append(p);
 807       p = QPointF(pointTo.x(),pointTo.y()+gap);
 808       pathPaint.lineTo(p);
 809       s.lineTo(p);
 810       interPoints.append(p);
 811       pathPaint.lineTo(pointTo);
 812     }
 813   }
 814   else if ((orientationFrom == Parameters::West) || (orientationFrom == Parameters::East)) {
 815     double diffPos = pointFrom.x() - pointTo.x();
 816     if (orientationFrom == Parameters::West) {
 817       gap = -gap;
 818       diffPos = -diffPos;
 819     }
 820     p = QPointF(pointFrom.x()+gap,pointFrom.y());
 821     s.moveTo(p);
 822     if (diffPos >= 0.0) {
 823       pathPaint.lineTo(p);
 824       interPoints.append(p);
 825       p = QPointF(pointTo.x()+gap,pointFrom.y());
 826       pathPaint.lineTo(p);
 827       s.lineTo(p);
 828       interPoints.append(p);
 829       pathPaint.lineTo(pointTo);
 830       p = QPointF(pointTo.x()+gap,pointTo.y());
 831       s.lineTo(p);
 832     }
 833     else {
 834       p = QPointF(pointFrom.x()+gap,pointTo.y());
 835       pathPaint.lineTo(p);
 836       s.lineTo(p);
 837       interPoints.append(p);
 838       p = QPointF(pointTo.x()+gap,pointTo.y());
 839       pathPaint.lineTo(p);
 840       s.lineTo(p);
 841       interPoints.append(p);
 842       pathPaint.lineTo(pointTo);
 843     }
 844   }
 845
 846   pps.setWidth(5);
 847   pathShape = pps.createStroke(s);
 848 }
 849
 850 void ConnectionItem::setSelected(bool selected) {
 851   this->selected = selected;
 852   if(selected){
 853     setZValue(201);
 854   } else {
 855     setZValue(200);
 856   }
 857 }
 858
 859 void ConnectionItem::mousePressEvent(QGraphicsSceneMouseEvent *event) {
 860   QGraphicsItem::mousePressEvent(event);
 861   setZValue(zValue()+100);
 862   setSelected(!selected);
 863   update(boundingRect());
 864 }
 865
 866 void ConnectionItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) {
 867   QGraphicsItem::mouseReleaseEvent(event);
 868   setZValue(zValue()-100);
 869 }
 870
 871 void ConnectionItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
 872   QGraphicsItem::mouseMoveEvent(event);
 873 }
 874
 875 void ConnectionItem::contextMenuEvent(QGraphicsSceneContextMenuEvent * event) {
 876   /* have to check if the connection can be removed.
 877      If the from or to InterfaceItem is owned by a group item, and this item
 878      is both connected to and from, thus it is impossible to remove this connection
 879      because there would be a  group interface alone and not connected and this situation is not allowed.
 880
 881      Nevertheless, there are 2 exceptions :
 882         - a from group interface is connected to more than one input interface
 883         - the connection is between a source block outside the top group and the top group
 884    */
 885   bool canRemove = true;
 886
 887   if (fromInterfaceItem->getOwner()->isGroupItem()) {
 888     ConnectedInterface* ref = fromInterfaceItem->refInter;
 889     if ((ref->isConnectedFrom()) && (ref->getConnectedTo().length() == 1)) {
 890       canRemove = false;
 891     }
 892   }
 893   else if ((toInterfaceItem->getOwner()->isGroupItem()) && (! toInterfaceItem->getOwner()->getRefBlock()->isTopGroupBlock())) {
 894     ConnectedInterface* ref = toInterfaceItem->refInter;
 895     if ((ref->isConnectedFrom()) && (ref->isConnectedTo())) {
 896       canRemove = false;
 897     }
 898   }
 899
 900   if (canRemove) {
 901     QMenu menu;
 902     QAction* titleAction = menu.addAction("Connection operations");
 903     titleAction->setEnabled(false);
 904     menu.addSeparator();
 905     QAction* removeAction = menu.addAction("Remove");
 906     QAction * selectedAction= menu.exec(event->screenPos());
 907
 908     if(selectedAction == removeAction){
 909       dispatcher->removeConnection(this);
 910     }
 911   }
 912 }
 913
 914 void ConnectionItem::prepareChange() {
 915   prepareGeometryChange();
 916 }
 917
 918 QDataStream &operator <<(QDataStream &out, ConnectionItem &c) {
 919   out.setVersion(QDataStream::Qt_4_8);
 920
 921   QByteArray connData;
 922   QDataStream toWrite(&connData, QIODevice::WriteOnly);
 923
 924   toWrite << c.id;
 925   toWrite << c.getFromInterfaceItem()->getId();
 926   toWrite << c.getToInterfaceItem()->getId();
 927
 928   out << connData;
 929
 930   return out;
 931 }
 932
 933 QDataStream &operator >>(QDataStream &in, ConnectionItem &c) {
 934   in.setVersion(QDataStream::Qt_4_8);
 935
 936   return in;
 937 }