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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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30
ground/src/experimental/DialTest/basicdial.cpp
View File

@ -27,18 +27,22 @@ void BasicDial::paintEvent(QPaintEvent *event) {
void BasicDial::renderBackground(void) {
int side = qMin(width(), height());
if( bg.size() == QSize(side, side) ) {
if( bg.size() == size() ) {
qDebug() << "BasicDial::renderBackground(): Size not changed! Abort rerendering stuff";
return;
}
QPixmap pixmap(QSize(side, side));
/* Create buffer pixmap and make it transparent */
QPixmap pixmap(size());
pixmap.fill(Qt::transparent);
/* Configure painter */
QPainter painter(&pixmap);
painter.setRenderHint(QPainter::Antialiasing);
QRectF frame( QPoint(0, 0), QPoint(side-1, side-1));
renderer->load(backgroundFile);
renderer->render(&painter, frame);
bg = pixmap;
renderer->load(backgroundFile); /* load file; needed to calculate frame */
QRectF frame = calculateCenteredFrame(); /* viewport from renderer (based on loaded file */
renderer->render(&painter, frame); /* dump bg on pixmap */
bg = pixmap; /* save it */
}
void BasicDial::renderNeedle(qreal angle) {
@ -93,3 +97,17 @@ void BasicDial::setPen(QPen p) {
pen = p;
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
View File

@ -29,6 +29,8 @@ private:
void renderNeedle(qreal angle);
qreal value2angle(qreal value);
QRectF calculateCenteredFrame(void);
QSvgRenderer *renderer;
QPixmap bg;
qreal angle;