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profile: remove need for MainWindow when rendering the profile

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Very annoyingly, to render the profile for printing / export,
the profile still had to be show()n, thus requiring a parent
window.

Analysis of qmlprofile.c showed that this was due to the
transformation matrix not being properly set up on non-show()n
scenes.

Instead, we can simply render via the QGraphicsScene
(circumventing the QGraphicsView).

The code was factored out into the ProfileWidget2::draw()
function. This will hopefully make it easier to change
the size-code of the profile.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-05-06 14:45:09 +02:00 • committed by Dirk Hohndel
parent 13d4f595cb
commit b39e88b8c6
5 changed files with 51 additions and 48 deletions
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36
profile-widget/profilewidget2.cpp
View file

@ -2161,3 +2161,39 @@ struct dive *ProfileWidget2::mutable_dive() const
{
return const_cast<dive *>(d);
}
QImage ProfileWidget2::toImage(QSize size)
{
// The size of chart with respect to the scene is fixed - by convention - to 100.0.
// We add 2% to the height so that the dive computer name is not cut off.
QRectF sceneRect(0.0, 0.0, 100.0, 102.0);
QImage image(size, QImage::Format_ARGB32);
image.fill(getColor(::BACKGROUND, isGrayscale));
QPainter imgPainter(&image);
imgPainter.setRenderHint(QPainter::Antialiasing);
imgPainter.setRenderHint(QPainter::SmoothPixmapTransform);
scene()->render(&imgPainter, QRect(QPoint(), size), sceneRect, Qt::IgnoreAspectRatio);
imgPainter.end();
if (isGrayscale) {
// convert QImage to grayscale before rendering
for (int i = 0; i < image.height(); i++) {
QRgb *pixel = reinterpret_cast<QRgb *>(image.scanLine(i));
QRgb *end = pixel + image.width();
for (; pixel != end; pixel++) {
int gray_val = qGray(*pixel);
*pixel = QColor(gray_val, gray_val, gray_val).rgb();
}
}
}
return image;
}
void ProfileWidget2::draw(QPainter *painter, const QRect &pos)
{
QImage img = toImage(pos.size());
painter->drawImage(pos, img);
}

2
profile-widget/profilewidget2.h
View file

@ -79,6 +79,8 @@ public:
bool isPlanner() const;
double getFontPrintScale() const;
void setFontPrintScale(double scale);
void draw(QPainter *painter, const QRect &pos);
QImage toImage(QSize size);
#ifndef SUBSURFACE_MOBILE
bool eventFilter(QObject *, QEvent *) override;
#endif