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Code Issues Releases Activity

Handle non-1:1 aspect ratio bacgrounds.

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git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@470 ebee16cc-31ac-478f-84a7-5cbb03baadba
This commit is contained in:
thenobody 2010-04-10 14:56:40 +00:00 committed by thenobody
parent ad9227d7a4
commit c15aba6b84
3 changed files with 27 additions and 7 deletions
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2
ground/src/experimental/DialTest/README.txt
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@ -1,4 +1,4 @@
Widget experiments. Compile and run test application Widget experiments. Compile and run test application
to see widget. to see widget.
Simple panel lets you test new backgrounds. Simple panel lets you test new backgrounds.

30
ground/src/experimental/DialTest/basicdial.cpp
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@ -27,18 +27,22 @@ void BasicDial::paintEvent(QPaintEvent *event) {
void BasicDial::renderBackground(void) { void BasicDial::renderBackground(void) {
int side = qMin(width(), height()); int side = qMin(width(), height());
if( bg.size() == QSize(side, side) ) { if( bg.size() == size() ) {
qDebug() << "BasicDial::renderBackground(): Size not changed! Abort rerendering stuff"; qDebug() << "BasicDial::renderBackground(): Size not changed! Abort rerendering stuff";
return; return;
} }
QPixmap pixmap(QSize(side, side)); /* Create buffer pixmap and make it transparent */
QPixmap pixmap(size());
pixmap.fill(Qt::transparent); pixmap.fill(Qt::transparent);
/* Configure painter */
QPainter painter(&pixmap); QPainter painter(&pixmap);
painter.setRenderHint(QPainter::Antialiasing); painter.setRenderHint(QPainter::Antialiasing);
QRectF frame( QPoint(0, 0), QPoint(side-1, side-1));
renderer->load(backgroundFile); renderer->load(backgroundFile); /* load file; needed to calculate frame */
renderer->render(&painter, frame); QRectF frame = calculateCenteredFrame(); /* viewport from renderer (based on loaded file */
bg = pixmap; renderer->render(&painter, frame); /* dump bg on pixmap */
bg = pixmap; /* save it */
} }
void BasicDial::renderNeedle(qreal angle) { void BasicDial::renderNeedle(qreal angle) {
@ -93,3 +97,17 @@ void BasicDial::setPen(QPen p) {
pen = p; pen = p;
pen.setWidth(2); pen.setWidth(2);
} }
QRectF BasicDial::calculateCenteredFrame(void) {
QRectF vb = renderer->viewBoxF(); /* get SVG viewport */
qreal scale = qMax( (vb.height()/height()), (vb.width()/width())); /* calc scale to fit SVG into widget */
vb.setWidth( vb.width()/scale ); /* scale viewport so SVG fit widget size */
vb.setHeight( vb.height()/scale );
QRectF frame; /* let's prepare render frame for bg */
frame.setX( (width()-vb.width())/2.0 ); /* frame is centered on widget */
frame.setY( (height()-vb.height())/2.0 );
frame.setWidth( vb.width() ); /* derive size from scaled viewport */
frame.setHeight( vb.height() );
return frame;
}

2
ground/src/experimental/DialTest/basicdial.h
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@ -29,6 +29,8 @@ private:
void renderNeedle(qreal angle); void renderNeedle(qreal angle);
qreal value2angle(qreal value); qreal value2angle(qreal value);
QRectF calculateCenteredFrame(void);
QSvgRenderer *renderer; QSvgRenderer *renderer;
QPixmap bg; QPixmap bg;
qreal angle; qreal angle;