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Profile: add white outline to all text

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To draw the white outline around profile text we trace a text path
using QPainterPath::addText() and then create a couple of
QGraphicsPathItem objects. One of the objects is outlined using
QPainterPathStroker and is placed at the bottom of a QGraphicsItemGroup
with a white brush. The other object holds the standard colored text
and is placed on top.

Notes:
- possibly quite expensive on older machines
- ProfileGraphicsView::plot_text() now returns a QGraphicsItemGroup
- QGraphicsSimpleTextItem uses a top-left baseline anchor
while QPainterPath::addText() uses a bottom-left baseline
which is a bit mysterious, requires the -3 offset for a match
and is possibly non-portable across fonts and sizes.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Lubomir I. Ivanov 2013-07-01 15:21:01 +03:00 • committed by Dirk Hohndel
parent 9d9d516c26
commit b68e86a141
2 changed files with 23 additions and 10 deletions
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2
qt-ui/profilegraphics.h
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@ -104,7 +104,7 @@ public slots:
private:
void plot_depth_profile();
QGraphicsSimpleTextItem* plot_text(text_render_options_t *tro, const QPointF& pos, const QString &text, QGraphicsItem *parent = 0);
QGraphicsItemGroup *plot_text(text_render_options_t *tro, const QPointF& pos, const QString &text, QGraphicsItem *parent = 0);
void plot_events(struct divecomputer *dc);
void plot_one_event(struct event *event);
void plot_temperature_profile();