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Set minimum zoom equal to window size minus 5 pixels.

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This commit is contained in:
Luis Lucas
2015-01-25 23:46:29 +00:00
parent dfa2c92a9a
commit 93cd7b5f71
3 changed files with 41 additions and 10 deletions
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app/ViewArea.cpp
+36 -5
View File
@@ -109,12 +109,41 @@ Void ViewArea::setZoomFactor( Double f )
update();
}
Double ViewArea::scaleZoomFactor( Double scale, QPoint center )
Double ViewArea::scaleZoomFactor( Double scale, QPoint center, QSize minimumSize )
{
Double zoomFactor;
Double maxZoom = 100.0;
Double minZoom = 0.01; //( 1.0 / m_pixmap.width() );
Double new_scale = 1.0;
Double zoomFactor = m_zoomFactor * scale;
if(!minimumSize.isNull())
{
Double cw = m_pixmap.width()*m_zoomFactor;
Double ch = m_pixmap.height()*m_zoomFactor;
Double fw = m_pixmap.width()*zoomFactor;
Double fh = m_pixmap.height()*zoomFactor;
Double mw = minimumSize.width();
Double mh = minimumSize.height();
if( (cw < mw) && (ch < mh) && (scale < 1) )
{
return new_scale;
}
if( (fw < mw) && (fh < mh) && (scale < 1) )
{
Double wfactor = mw/fw;
Double hfactor = mh/fh;
if( wfactor < hfactor )
scale = wfactor;
else
scale = hfactor;
zoomFactor = zoomFactor * scale;
scale = zoomFactor/m_zoomFactor;
}
}
if( ( m_zoomFactor == minZoom ) && ( scale < 1 ) )
return new_scale;
@@ -122,7 +151,7 @@ Double ViewArea::scaleZoomFactor( Double scale, QPoint center )
if( ( m_zoomFactor == maxZoom ) && ( scale > 1 ) )
return new_scale;
zoomFactor = m_zoomFactor * scale;
new_scale = scale;
if( zoomFactor < minZoom )
@@ -289,7 +318,7 @@ void ViewArea::resizeEvent( QResizeEvent *event )
if( size().isEmpty() || m_pixmap.isNull() )
return;
updateOffset();
updateSize();
update();
}
////////////////////////////////////////////////////////////////////////////////
@@ -567,7 +596,9 @@ void ViewArea::wheelEvent( QWheelEvent *event )
else
scale=0.8;
usedScale = scaleZoomFactor( scale , event->pos() );
QWidget *p = parentWidget();
QSize minimumSize = QSize( p->size().width() - 5, p->size().height() - 5 );
usedScale = scaleZoomFactor( scale , event->pos(), minimumSize );
if( usedScale != 1.0 )
{
emit zoomFactorChanged_byWheel( usedScale, event->pos() );