Mouse Translation

[nirab_25]

Hi ....
I am adding QgraphicsItem in scene and it works fine in the application... but when i change mouse position to switch another application in taskbar then crashes....
but i dont understand why & from where the problem is happening...

here is debug tracer....

0 QApplicationPrivate::notify_helper qapplication.cpp 4396 0x01d396f5
1 QApplication::notify qapplication.cpp 3798 0x01d37012
2 QCoreApplication::notifyInternal qcoreapplication.cpp 732 0x6a1ff9dc
3 QCoreApplication::sendEvent qcoreapplication.h 215 0x023ad592
4 QGraphicsScenePrivate::sendEvent qgraphicsscene.cpp 1207 0x022d525f
5 QGraphicsScene::sendEvent qgraphicsscene.cpp 5673 0x022e3a3b
6 QGraphicsItem::sceneEvent qgraphicsitem.cpp 6718 0x022b9eae
7 QGraphicsScenePrivate::sendEvent qgraphicsscene.cpp 1211 0x022d5297
8 QGraphicsScene::sendEvent qgraphicsscene.cpp 5673 0x022e3a3b
9 QGraphicsScene::event qgraphicsscene.cpp 3508 0x022dbdbe
10 QApplicationPrivate::notify_helper qapplication.cpp 4396 0x01d39706
11 QApplication::notify qapplication.cpp 3798 0x01d37012
12 QCoreApplication::notifyInternal qcoreapplication.cpp 732 0x6a1ff9dc
13 QCoreApplication::sendEvent qcoreapplication.h 215 0x023ad592
14 QGraphicsView::viewportEvent qgraphicsview.cpp 2765 0x022fa541
15 QAbstractScrollAreaPrivate::viewportEvent qabstractscrollarea_p.h 100 0x023e6a13
16 QAbstractScrollAreaFilter::eventFilter qabstractscrollarea_p.h 116 0x023e506c
17 QCoreApplicationPrivate::sendThroughObjectEventFil ters qcoreapplication.cpp 847 0x6a1ffc73
18 QApplicationPrivate::notify_helper qapplication.cpp 4392 0x01d396e5
19 QApplication::notify qapplication.cpp 4361 0x01d39586
20 QCoreApplication::notifyInternal qcoreapplication.cpp 732 0x6a1ff9dc
21 QCoreApplication::sendEvent qcoreapplication.h 215 0x023ad592
22 QWidget::event qwidget.cpp 8443 0x01d84ce8
23 QFrame::event qframe.cpp 557 0x020fe6bc
24 QAbstractScrollArea::event qabstractscrollarea.cpp 996 0x0218be88
25 QGraphicsView::event qgraphicsview.cpp 2739 0x022fa37b
26 QApplicationPrivate::notify_helper qapplication.cpp 4396 0x01d39706
27 QApplication::notify qapplication.cpp 4361 0x01d39586
28 QCoreApplication::notifyInternal qcoreapplication.cpp 732 0x6a1ff9dc
29 QCoreApplication::sendEvent qcoreapplication.h 215 0x023ad592
30 QWidget::event qwidget.cpp 8443 0x01d84ce8
31 QGroupBox::event qgroupbox.cpp 397 0x020ff5fe
32 QApplicationPrivate::notify_helper qapplication.cpp 4396 0x01d39706
33 QApplication::notify qapplication.cpp 4361 0x01d39586
34 QCoreApplication::notifyInternal qcoreapplication.cpp 732 0x6a1ff9dc
35 QCoreApplication::sendEvent qcoreapplication.h 215 0x023ad592
36 QWidget::event qwidget.cpp 8443 0x01d84ce8
37 QMainWindow::event qmainwindow.cpp 1417 0x0211d23a
38 QApplicationPrivate::notify_helper qapplication.cpp 4396 0x01d39706
39 QApplication::notify qapplication.cpp 4361 0x01d39586
40 QCoreApplication::notifyInternal qcoreapplication.cpp 732 0x6a1ff9dc
41 QCoreApplication::sendSpontaneousEvent qcoreapplication.h 218 0x023ad53e
42 QApplication::setActiveWindow qapplication.cpp 2549 0x01d34956
43 QtWndProc@16 qapplication_win.cpp 1993 0x01d9bba0
44 USER32!GetDC C:\WINDOWS\system32\user32.dll 0 0x7e418734
45 USER32!GetDC C:\WINDOWS\system32\user32.dll 0 0x7e418734
46 ?? 0 0x001702ca
47 ?? qwidget.h 487 0x0000001c
48 USER32!GetDC C:\WINDOWS\system32\user32.dll 0 0x7e418816
49 qt_is_translatable_mouse_event qapplication_win.cpp 1426 0x01d99fa5
50 USER32!DefWindowProcW C:\WINDOWS\system32\user32.dll 0 0x7e428ea0
51 ?? 0 0x00000000

[squidge]

null pointer?

Post some code.

[nirab_25]

hi squidge....

here is my code please check it......



#include "myGraphicsItemLinear.h"
#include "myGraphicsItemLine.h"
#include "myGraphicsItemPropertyFactory.h"

myGraphicsItemLinear::myGraphicsItemLinear(int nToolID)
{
m_bReshapeable = true;
setItemID(nToolID);

m_Pen1 = NULL;
m_Pen2 = NULL;
m_Pen3 = NULL;
m_Pen4 = NULL;
m_Pen5 = NULL;
}

myGraphicsItem* myGraphicsItemLinear::clone()
{
myGraphicsItem *pItemSelf = new myGraphicsItemLinear(m_nItemID);
pItemSelf->setItemName(m_strItemName);
pItemSelf->loadImage();
pItemSelf->setZValue(this->zValue());
pItemSelf->setMeterPerPixel(m_fMeterPerPixel);
pItemSelf->setPolygon(this->polygon());
pItemSelf->setItemProperty(this->m_pItemProperty->clone());
pItemSelf->setFlags(flags());
//
return pItemSelf;
}

QRectF myGraphicsItemLinear::boundingRect() const
{
QRectF rect(QGraphicsPolygonItem::boundingRect());

if(m_Pen1 != NULL)
{
qreal deviation = m_Pen1->widthF();
rect.adjust(-deviation, -deviation, deviation, deviation);
return rect;
}
else
{
return rect.adjusted(-1,-1,1,1);
}
}

void myGraphicsItemLinear:ropertyChanged(QStandardItem *item)
{
setToolTipFromProperty();
}

void myGraphicsItemLinear:aint(QPainter *painter,
const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
//
painter->setRenderHint(QPainter::Antialiasing);

if(m_Pen1 != NULL)
{
QColor colorPre(m_Pen1->color());
if(isSelected())
{
m_Pen1->setColor(Qt::red);
}
painter->setPen(*m_Pen1);
painter->drawPolyline(m_itemPolygon);
m_Pen1->setColor(colorPre);
}
if(m_Pen2 != NULL)
{
painter->setPen(*m_Pen2);
painter->drawPolyline(m_itemPolygon);
}
if(m_Pen3 != NULL)
{
painter->setPen(*m_Pen3);
painter->drawPolyline(m_itemPolygon);
}
if(m_Pen4 != NULL)
{
painter->setPen(*m_Pen4);
painter->drawPolyline(m_itemPolygon);
}
if(m_Pen5 != NULL)
{
painter->setPen(*m_Pen5);
painter->drawPolyline(m_PolygonInternationalDemarcated);
}
}

QPolygonF myGraphicsItemLinear:olygon() const
{
return m_itemPolygon;
}

void myGraphicsItemLinear::setPolygon(const QPolygonF &polygon)
{
bool rePos = false;
if(m_itemPolygon.count() == polygon.count())
{
rePos = true;
}
m_itemPolygon = polygon;
//
QVector<QPointF> revVect;
QPolygonF tmpPoly(polygon);
QPointF ptNext(0,0);
bool bNextPoint = true;

for(int i=m_itemPolygon.count()-1; i>-1; i--)
{
revVect.append(m_itemPolygon.at(i));

QPointF pt = m_itemPolygon.at(i);
// pt.setY(pt.y()+ 2.5);
// m_PolygonInternationalDemarcated.append(pt);

if (bNextPoint )
{
ptNext = pt;
bNextPoint = false;
QPointF pt = m_itemPolygon.at(i - 1);

int nX = qAbs(pt.x() - ptNext.x());
int nY = qAbs(pt.y() - ptNext.y());

if (nX > nY)
{
ptNext.setY(ptNext.y()+ 2.5);
m_PolygonInternationalDemarcated.append(ptNext);
}
else if (nX < nY)
{
ptNext.setX(ptNext.x() + 2.5);
m_PolygonInternationalDemarcated.append(ptNext);
}
}
else
{
int nX = qAbs(pt.x() - ptNext.x());
int nY = qAbs(pt.y() - ptNext.y());

if (nX > nY)
{
pt.setY(pt.y()+ 2.5);
m_PolygonInternationalDemarcated.append(pt);
}
else if (nX < nY)
{
pt.setX(pt.x() + 2.5);
m_PolygonInternationalDemarcated.append(pt);
}

if (pt.x() != ptNext.x() || pt.y() != ptNext.y())
{
ptNext = pt;
}
} //
}

tmpPoly += revVect;

QGraphicsPolygonItem::setPolygon(tmpPoly);
//
if(rePos)
{
repositionSegmentItem(polygon);
}
else
{
createSegmentItem(polygon);
}
}

void myGraphicsItemLinear::setMeterPerPixel(const float& fMeter)
{
m_fMeterPerPixel = fMeter;
loadImage();
}

void myGraphicsItemLinear::createSegmentItem(const QPolygonF &polygon)
{
qDebug("myGraphicsItemLinear::createSegmentItem");
int nChildID = 1110;


QPolygonF poly;
myGraphicsItemLine *pSegment = NULL;
int i;
for(i = 0; i < polygon.count()-1; i++)
{
poly << polygon.at(i) << polygon.at(i+1);
pSegment = new myGraphicsItemLine(nChildID, this);
pSegment->setPolygon(poly);
//
pSegment->setFlag(ItemIsSelectable, true);
pSegment->setFlag(ItemIsMovable, false);
pSegment->setFlag(ItemIsFocusable, false);
//
poly.clear();
}
}

void myGraphicsItemLinear::repositionSegmentItem(const QPolygonF &polygon)
{
//qDebug("myGraphicsItemLinear::repositionSegmentIte m");
QPolygonF poly;
myGraphicsItemLine *pSegment = NULL;

int i;
for(i = 0; i < polygon.count()-1; i++)
{
poly << polygon.at(i) << polygon.at(i+1);
pSegment = (myGraphicsItemLine*)childItems().at(i);
pSegment->setPolygon(poly);
pSegment->update();
//
poly.clear();
}
}

void myGraphicsItemLinear::setItemProperty(myGraphicsIt emProperty* pProperty)
{
//
myGraphicsItem::setItemProperty(pProperty);

//
myGraphicsItemLine *pSegment = NULL;
myGraphicsItemProperty *pSegmentProperty;
QStandardItemModel *pModel = pProperty->getStandardModel();
int i,j;
for(i = 0; i< childItems().count(); i++)
{
pSegmentProperty = new myGraphicsItemProperty(m_nItemID);
//
for(j = 0; j< pModel->rowCount(); j++)
{
pSegmentProperty->addProperty(pModel->item(j, 0)->text(), pModel->item(j, 1)->text());
}
pSegmentProperty->setSegmentID(i);
//
pSegment = (myGraphicsItemLine*)childItems().at(i);
if(pSegment)
{
pSegment->setItemProperty(pSegmentProperty);
}
}
}


void myGraphicsItemLinear::loadImage()
{

switch(m_nItemID)
{
case ID_TOOL_TERRAIN_RAILWAYS_BROADGAUGE_DOUBLE:
{
m_Pen1 = new QPen();
m_Pen2 = new QPen();

m_Pen1->setStyle(Qt::SolidLine);
m_Pen1->setColor(Qt::black);
m_Pen1->setWidthF(3/m_fMeterPerPixel);
//
QVector<qreal> pattern;
pattern.append(qreal(3));
pattern.append(qreal(11));
m_Pen2->setDashPattern(pattern);
m_Pen2->setDashOffset(4);
m_Pen2->setColor(Qt::white);
m_Pen2->setWidthF(2/m_fMeterPerPixel);
}break;

case ID_TOOL_TERRAIN_RAILWAY_MIXED_GAUGE:
{
m_Pen1 = new QPen();
m_Pen2 = new QPen();

m_Pen1->setStyle(Qt::SolidLine);
m_Pen1->setColor(Qt::black);
m_Pen1->setWidthF(3/m_fMeterPerPixel);
//
QVector<qreal> pattern;
pattern.append(qreal(3));
pattern.append(qreal(11));
m_Pen2->setDashPattern(pattern);
m_Pen2->setDashOffset(4);
m_Pen2->setColor(Qt::white);
m_Pen2->setWidthF(2/m_fMeterPerPixel);

pattern[0] = qreal(10);
pattern[1] = qreal(4);

m_Pen3 = new QPen();

m_Pen3->setStyle(Qt::SolidLine);
m_Pen3->setColor(Qt::black);
m_Pen3->setWidthF(.5/m_fMeterPerPixel);
}break;

default:
{
m_Pen1 = NULL;
m_Pen2 = NULL;
m_Pen3 = NULL;
m_Pen4 = NULL;
m_Pen5 = NULL;
}break;
};
}