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  1. 4th September 2007, 18:21 #1
    abbapatris
    abbapatris is offline Novice
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    Default QGraphicsView wont show every item

    I created a custom QGraphicsItem, subclassed it and everything. I run that with my program and it starts to hide my QGraphicsLineItems and my QGraphicsElipseItem. I am not sure why. I have narrowed it down to my customItem if anyone has any clue could you late me know. The code is below.
    Qt Code: 
    1. #include "SearchArea.h"
    2.  
    3. SearchArea::SearchArea(double rangeExtent, double centerRange,
    4. 					   double centerAzimuth, double azimuthExtent,
    5. 					   QGraphicsScene *parent)
    6. 	: QGraphicsItem(0,parent)
    7. {
    8. 	radarCenterRange = rangeExtent; 
    9. 	radarRangeExtent = centerRange;
    10. 	radarCenterAzimuth = centerAzimuth;
    11. 	radarAzimuthExtent = azimuthExtent;
    12. 	zoomValue = 1;
    13. 	cPoint = new QPoint();
    14. 	cPoint->setX(0);
    15. 	cPoint->setY(0);
    16. 	gPen = new QPen();
    17. 	gPen->setColor(Qt::green);
    18.  
    19. }
    20.  
    21. SearchArea::~SearchArea()
    22. {
    23.  
    24. }
    25. ////////////////////////////////////////////////////////////////////////
    26. void SearchArea::drawFence()
    27. {
    28. 	double rangeExtentZoom = radarRangeExtent/10 * zoomValue;
    29. 	double centerRangeZoom = radarCenterRange/10 * zoomValue;
    30. 	double rangeExtentZoomFarthest = centerRangeZoom + rangeExtentZoom/2;
    31. 	double rangeExtentZoomClosest = centerRangeZoom - rangeExtentZoom/2;
    32. 	double azimuthExtentLowest = radarCenterAzimuth - radarAzimuthExtent/2;
    33. 	double azimuthExtentHightest = radarCenterAzimuth + radarAzimuthExtent/2;
    34. 	QPoint startLowerLine, finishLowerLine, startUpperLine, finishUpperLine;	
    35. 	gPainter->setPen(gPen->color());
    36.  
    37.  
    38. 	startLowerLine = GetArkPoint(radarCenterAzimuth, azimuthExtentLowest, rangeExtentZoomClosest);
    39. 	finishLowerLine = GetArkPoint(radarCenterAzimuth, azimuthExtentLowest, rangeExtentZoomFarthest);
    40. 	startUpperLine = GetArkPoint(radarCenterAzimuth, azimuthExtentHightest, rangeExtentZoomClosest);
    41. 	finishUpperLine = GetArkPoint(radarCenterAzimuth, azimuthExtentHightest, rangeExtentZoomFarthest);
    42.  
    43. 	double radius1 = sqrt(pow(finishLowerLine.x(),2)+pow(finishLowerLine.y(),2));
    44. 	double height1 = radius1*2;	
    45.  
    46. 	gPainter->drawLine(startUpperLine, finishUpperLine);
    47. 	gPainter->drawLine(startLowerLine, finishLowerLine);
    48.  
    49. 	drawArcFence(startUpperLine,azimuthExtentLowest,radarAzimuthExtent);
    50. 	drawArcFence(finishUpperLine,azimuthExtentLowest,radarAzimuthExtent);
    51.  
    52.  
    53. 	gPainter->end();
    54.  
    55. }
    56. ////////////////////////////////////////////////////////////////////////
    57.  void SearchArea::paint(QPainter *painter,
    58.             const QStyleOptionGraphicsItem *option, QWidget *widget)
    59.  {	
    60. 	 gPainter = painter;
    61.      Q_UNUSED(option);
    62.      Q_UNUSED(widget);
    63.  
    64. 	drawFence();	
    65.  
    66.  }
    67. ////////////////////////////////////////////////////////////////////////
    68. QPoint SearchArea::GetArkPoint(double centerAzimuth, double azimuth, double rangeExtent)
    69. {
    70. 	QPoint lowerArkPoint;
    71. 	lowerArkPoint.setY( (sin (azimuth*PI/180) * rangeExtent )*-1);
    72. 	lowerArkPoint.setX( (cos (azimuth*PI/180) * rangeExtent) );
    73. 	lowerArkPoint.setX( lowerArkPoint.x());
    74. 	lowerArkPoint.setY( lowerArkPoint.y());
    75.  
    76. 	return lowerArkPoint;
    77.  
    78. }
    79.  
    80. ////////////////////////////////////////////////////////////////////////
    81. void SearchArea::drawArcFence(QPoint point, double azimuth, double azimuthExtent)
    82. {
    83. 	gPainter->setPen(gPen->color());
    84. 	point.setX(point.x());
    85. 	point.setY(point.y());
    86. 	double radius = sqrt(pow(point.x(),2)+pow(point.y(),2));
    87. 	double height = radius*2;
    88. 	gPainter->drawArc(0-radius,0-radius,height,height,azimuth*16,azimuthExtent*16);
    89. }
    90. ////////////////////////////////////////////////////////////////////////
    91.  QRectF SearchArea::boundingRect() const
    92.  {	 
    93.      return QRectF(0, 0,0, 0);
    94.  }
    95. ////////////////////////////////////////////////////////////////////////
    96.  void SearchArea::setPen(QPen * pen)
    97.  {
    98. 	 gPen = pen;
    99.  }
    100.  void SearchArea::setLocation(QPoint *centerPoint)
    101.  {
    102. 	 cPoint = centerPoint;
    103.  }
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    Last edited by abbapatris; 4th September 2007 at 18:26.
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