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Fixed scale flicker issue on OS X

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Performance improvements
This commit is contained in:
Martin Tůma
2016-02-02 20:12:56 +01:00
parent 9941faa218
commit 6acbf0d89f
5 changed files with 30 additions and 15 deletions
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9
src/scaleitem.cpp
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@ -17,11 +17,9 @@ ScaleItem::ScaleItem(QGraphicsItem *parent) : QGraphicsItem(parent)
_units = Metric;
_zoom = ZOOM_MIN;
_lat = 0;
computeScale();
}
QRectF ScaleItem::boundingRect() const
void ScaleItem::updateBoundingRect()
{
QFont font;
font.setPixelSize(FONT_SIZE);
@ -33,7 +31,7 @@ QRectF ScaleItem::boundingRect() const
es = fm.tightBoundingRect(QString::number(_length * SEGMENTS));
us = fm.tightBoundingRect(units());
return QRectF(-ss.width()/2, 0,
_boundingRect = QRectF(-ss.width()/2, 0,
_width * SEGMENTS + ss.width()/2 + qMax(us.width() + PADDING, es.width()/2),
SCALE_HEIGHT + PADDING + ss.height() + 2*fm.descent());
}
@ -110,6 +108,7 @@ void ScaleItem::setLatitude(qreal lat)
{
_lat = lat;
computeScale();
updateBoundingRect();
prepareGeometryChange();
}
@ -117,6 +116,7 @@ void ScaleItem::setZoom(int z)
{
_zoom = z;
computeScale();
updateBoundingRect();
prepareGeometryChange();
}
@ -124,5 +124,6 @@ void ScaleItem::setUnits(enum Units units)
{
_units = units;
computeScale();
updateBoundingRect();
prepareGeometryChange();
}