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New functions with QT GUI

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use inv matrix for Zoom in/out for better result
Fix some bugs with zoom/panning
This commit is contained in:
Yannick Verdie 2010-06-17 16:41:48 +00:00
parent 78a659287f
commit 386496863c
2 changed files with 60 additions and 29 deletions
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74
modules/highgui/src/window_QT.cpp
View File

@ -825,10 +825,8 @@ ViewPort::ViewPort(QWidget* arg, int arg2)
timerDisplay->setSingleShot(true);
connect(timerDisplay, SIGNAL(timeout()), this, SLOT(stopDisplayInfo()));
drawInfo = false;
previousFactor = 1;
previousCenter = QPointF(0,0);
previousDelta = QPointF(0,0);
positionGrabbing = QPointF(0,0);
positionCorners = QRect(0,0,size().width(),size().height());
if (mode == CV_MODE_OPENGL)
{
@ -905,23 +903,58 @@ void ViewPort::setMouseCallBack(CvMouseCallback m, void* param)
void ViewPort::controlImagePosition()
{
qreal left, top, right, bottom;
matrixWorld.map(0,0,&left,&top);
if (left < 0)left = 0;
if (top < 0)top = 0;
if (left>0 || top > 0)
matrixWorld.translate(-left,-top);
matrixWorld.map(0,0,&left,&top);
if (left > 0)
{
matrixWorld.translate(-left,0);
left = 0;
}
if (top > 0)
{
matrixWorld.translate(0,-top);
top = 0;
}
positionCorners.setTopLeft(QPoint(left,top));
QSize sizeImage = size();
matrixWorld.map(sizeImage.width(),sizeImage.height(),&right,&bottom);
if (right > sizeImage.width()) right = sizeImage.width();
if (bottom > sizeImage.height()) bottom = sizeImage.height();
if (right < sizeImage.width() || bottom < sizeImage.height())
matrixWorld.translate(sizeImage.width()-right,sizeImage.height()-bottom);
if (right < sizeImage.width())
{
matrixWorld.translate(sizeImage.width()-right,0);
right = sizeImage.width();
}
if (bottom < sizeImage.height())
{
matrixWorld.translate(0,sizeImage.height()-bottom);
bottom = sizeImage.height();
}
positionCorners.setBottomRight(QPoint(right,bottom));
}
void ViewPort::scaleView(qreal factor,QPointF center)
{
factor/=5;//-0.1 <-> 0.1
factor+=1;//0.9 <-> 1.1
if (matrixWorld.m11()==1 && factor < 1)
return;
if (matrixWorld.m11()*factor<1)
factor = 1/matrixWorld.m11();
//inverse the transform
int a, b;
matrixWorld.inverted().map(center.x(),center.y(),&a,&b);;
matrixWorld.translate(a-factor*a,b-factor*b);
matrixWorld.scale(factor,factor);
controlImagePosition();
/*
factor += previousFactor;
if (factor < 1 || factor > 100)
return;
@ -929,7 +962,7 @@ void ViewPort::scaleView(qreal factor,QPointF center)
center= (center-previousCenter)/previousFactor + previousCenter;//move to global coordinate
QPointF delta = QPointF(center-center*factor);
matrixWorld.reset ();
//matrixWorld.reset ();
matrixWorld.translate(delta.x(),delta.y());//newCenter.x(),newCenter.y());
matrixWorld.scale(factor,factor);
@ -939,7 +972,9 @@ void ViewPort::scaleView(qreal factor,QPointF center)
//previousDelta = delta;
previousFactor = factor;
if (previousFactor>1)
*/
if (matrixWorld.m11()>1)
setCursor(Qt::OpenHandCursor);
else
unsetCursor();
@ -999,7 +1034,7 @@ void ViewPort::mousePressEvent(QMouseEvent *event)
on_mouse( cv_event, pt.x(), pt.y(), flags, on_mouse_param );
if (previousFactor>1)
if (matrixWorld.m11()>1)
{
setCursor(Qt::ClosedHandCursor);
positionGrabbing = event->pos();
@ -1055,7 +1090,7 @@ void ViewPort::mouseReleaseEvent(QMouseEvent *event)
if (on_mouse)
on_mouse( cv_event, pt.x(), pt.y(), flags, on_mouse_param );
if (previousFactor>1)
if (matrixWorld.m11()>1)
setCursor(Qt::OpenHandCursor);
QWidget::mouseReleaseEvent(event);
@ -1140,15 +1175,15 @@ void ViewPort::mouseMoveEvent(QMouseEvent *event)
on_mouse( cv_event, pt.x(), pt.y(), flags, on_mouse_param );
if (previousFactor>1 && event->buttons() == Qt::LeftButton)
if (matrixWorld.m11()>1 && event->buttons() == Qt::LeftButton)
{
QPointF dxy = (pt - positionGrabbing)/previousFactor;
QPointF dxy = (pt - positionGrabbing)/matrixWorld.m11();
positionGrabbing = event->pos();
matrixWorld.translate(dxy.x(),dxy.y());
controlImagePosition();
}
}
QWidget::mouseMoveEvent(event);
}
@ -1293,4 +1328,3 @@ void ViewPort::draw3D()
#endif
#endif

15
modules/highgui/src/window_QT.h
View File

@ -168,20 +168,17 @@ public:
void startDisplayInfo(QString text, int delayms);
void setMouseCallBack(CvMouseCallback m, void* param);
QTransform matrixWorld;
qreal scaleFactor;//for zoom int/out
public slots:
//reference:
//http://www.qtcentre.org/wiki/index.php?title=QGraphicsView:_Smooth_Panning_and_Zooming
//http://doc.qt.nokia.com/4.6/gestures-imagegestures-imagewidget-cpp.html
//reference:
//http://www.qtcentre.org/wiki/index.php?title=QGraphicsView:_Smooth_Panning_and_Zooming
//http://doc.qt.nokia.com/4.6/gestures-imagegestures-imagewidget-cpp.html
void scaleView(qreal scaleFactor, QPointF center);
private:
QPointF previousCenter ;
qreal previousFactor;//for zoom int/out
QPointF previousDelta;
QPointF positionGrabbing;
QRect positionCorners;
QTransform matrixWorld;
CvMouseCallback on_mouse;
void* on_mouse_param;