void View::wheelEvent( QWheelEvent* e )
{
if ( e->orientation() == Qt::Vertical )
{
if ( e->delta() > 0 )
zoomAt( e->pos(), ZOOMINFACTOR );
else if ( e->delta() < 0 )
zoomAt( e->pos(), ZOOMOUTFACTOR );
}
}
//
// Mouse left button up event.
//
void CChartViewer::OnLButtonUp(UINT nFlags, CPoint point)
{
mouse_state=true;
if (m_isPlotAreaMouseDown)
{
// Release the mouse capture.
ReleaseCapture();
m_isPlotAreaMouseDown = false;
setRectVisible(false);
bool hasUpdate = false;
switch (m_mouseUsage)
{
case Chart::MouseUsageZoomIn :
if (canZoomIn(m_zoomDirection))
{
if (isDrag(m_zoomDirection, point))
// Zoom to the drag selection rectangle.
hasUpdate = zoomTo(m_zoomDirection,
m_plotAreaMouseDownXPos, m_plotAreaMouseDownYPos, point.x, point.y);
else
// User just click on a point. Zoom-in around the mouse cursor position.
hasUpdate = zoomAt(m_zoomDirection, point.x, point.y, m_zoomInRatio);
}
break;
case Chart::MouseUsageZoomOut:
// Zoom out around the mouse cursor position.
if (canZoomOut(m_zoomDirection))
hasUpdate = zoomAt(m_zoomDirection, point.x, point.y, m_zoomOutRatio);
break;
default :
if (m_isDragScrolling)
// Drag to scroll. We can update the image map now as scrolling has finished.
updateViewPort(false, true);
else
// Is not zooming or scrolling, so is just a normal click event.
GetParent()->SendMessage(WM_COMMAND, MAKEWPARAM(GetDlgCtrlID(), BN_CLICKED), (LPARAM)m_hWnd);
break;
}
m_isDragScrolling = false;
if (hasUpdate)
// View port has changed - update it.
updateViewPort(true, true);
}
CStatic::OnLButtonUp(nFlags, point);
}
void View::mouseReleaseEvent( QMouseEvent* e )
{
if( false == _mouseMoved )
{
switch( _mouseButtons )
{
case Qt::LeftButton:
{
if( e->modifiers() & Qt::CTRL )
{
fit();
}
else
{
if( e->modifiers() & Qt::AltModifier )
{
zoomAt( _mousePosAtPressEvent, ZOOMOUTFACTOR );
}
else
{
zoomAt( _mousePosAtPressEvent, ZOOMINFACTOR );
}
}
break;
}
case Qt::RightButton:
{
zoomAt( _mousePosAtPressEvent, ZOOMOUTFACTOR );
break;
}
case Qt::MidButton:
{
fit();
break;
}
}
}
e->accept();
}
void View::mouseMoveEvent( QMouseEvent* e )
{
_mouseMoved = true;
QPoint delta = _mousePos - e->pos();
_mousePos = e->pos();
if( e->modifiers() & Qt::AltModifier )
{
qreal f = 1.0f;
if( delta.y() > 0 )
{
f = ZOOMOUTFACTORSLOW;
}
else
{
f = ZOOMINFACTORSLOW;
}
zoomAt( _mousePosAtPressEvent, f );
}
else
{
translate( delta.y(), delta.x() );
}
}
