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44deaf6c51
This is turning into the never ending story. The documentation is not helpful, so this is the result of a ton of trial and error - and I worry that the next device I try this on will once again break things. I think the scaling may finally be correct. Take the viewport rectangles of the profile and the painter, create their ratio, multiply in the device pixel ratio and the scene size with a little margin added around it. But the other magic (especially the shifting of the profile on the painter) makes absolutely no sense to me. Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
108 lines
4.1 KiB
C++
108 lines
4.1 KiB
C++
#include "qmlprofile.h"
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#include "qmlmanager.h"
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#include "profile-widget/profilewidget2.h"
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#include "subsurface-core/dive.h"
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#include <QTransform>
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#include <QScreen>
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QMLProfile::QMLProfile(QQuickItem *parent) :
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QQuickPaintedItem(parent),
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m_devicePixelRatio(1.0),
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m_margin(0)
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{
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setAntialiasing(true);
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m_profileWidget = new ProfileWidget2(0);
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m_profileWidget->setProfileState();
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m_profileWidget->setPrintMode(true);
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m_profileWidget->setFontPrintScale(0.8);
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connect(QMLManager::instance(), &QMLManager::sendScreenChanged, this, &QMLProfile::screenChanged);
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setDevicePixelRatio(QMLManager::instance()->lastDevicePixelRatio());
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}
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QMLProfile::~QMLProfile()
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{
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m_profileWidget->deleteLater();
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}
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void QMLProfile::paint(QPainter *painter)
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{
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// let's look at the intended size of the content and scale our scene accordingly
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QRect painterRect = painter->viewport();
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QRect profileRect = m_profileWidget->viewport()->rect();
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qDebug() << "profile viewport and painter viewport" << profileRect << painterRect;
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qreal sceneSize = 104; // that should give us 2% margin all around (100x100 scene)
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qreal dprComp = devicePixelRatio() * painterRect.width() / profileRect.width();
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qreal sx = painterRect.width() / sceneSize / dprComp;
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qreal sy = painterRect.height() / sceneSize / dprComp;
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// next figure out the weird magic by which we need to shift the painter so the profile is shown
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int dpr = rint(devicePixelRatio());
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qreal magicShiftFactor = (dpr == 2 ? 0.25 : (dpr == 3 ? 0.33 : 0.0));
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// now set up the transformations scale the profile and
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// shift the painter (taking its existing transformation into account)
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QTransform profileTransform = QTransform();
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profileTransform.scale(sx, sy);
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QTransform painterTransform = painter->transform();
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painterTransform.translate(-painterRect.width() * magicShiftFactor ,-painterRect.height() * magicShiftFactor);
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// some debugging messages to help adjust this in case the magic above is insufficient
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QMLManager::instance()->appendTextToLog(QString("dpr %1 profile viewport %2 %3 painter viewport %4 %5").arg(dpr).arg(profileRect.width()).arg(profileRect.height())
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.arg(painterRect.width()).arg(painterRect.height()));
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QMLManager::instance()->appendTextToLog(QString("profile matrix %1 %2 %3 %4 %5 %6 %7 %8 %9").arg(profileTransform.m11()).arg(profileTransform.m12()).arg(profileTransform.m13())
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.arg(profileTransform.m21()).arg(profileTransform.m22()).arg(profileTransform.m23())
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.arg(profileTransform.m31()).arg(profileTransform.m32()).arg(profileTransform.m33()));
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QMLManager::instance()->appendTextToLog(QString("painter matrix %1 %2 %3 %4 %5 %6 %7 %8 %9").arg(painterTransform.m11()).arg(painterTransform.m12()).arg(painterTransform.m13())
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.arg(painterTransform.m21()).arg(painterTransform.m22()).arg(painterTransform.m23())
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.arg(painterTransform.m31()).arg(painterTransform.m32()).arg(painterTransform.m33()));
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qDebug() << "profile scaled by" << profileTransform.m11() << profileTransform.m22() << "and translated by" << profileTransform.m31() << profileTransform.m32();
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qDebug() << "exist profile transform" << m_profileWidget->transform() << "painter transform" << painter->transform();
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// apply the transformation
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painter->setTransform(painterTransform);
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m_profileWidget->setTransform(profileTransform);
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// finally, render the profile
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m_profileWidget->render(painter);
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}
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void QMLProfile::setMargin(int margin)
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{
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m_margin = margin;
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}
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QString QMLProfile::diveId() const
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{
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return m_diveId;
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}
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void QMLProfile::setDiveId(const QString &diveId)
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{
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m_diveId = diveId;
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struct dive *d = get_dive_by_uniq_id(m_diveId.toInt());
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if (m_diveId.toInt() < 1)
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return;
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if (!d)
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return;
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qDebug() << "setDiveId called with valid dive" << d->number;
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m_profileWidget->plotDive(d, true);
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}
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qreal QMLProfile::devicePixelRatio() const
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{
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return m_devicePixelRatio;
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}
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void QMLProfile::setDevicePixelRatio(qreal dpr)
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{
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if (dpr != m_devicePixelRatio) {
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m_devicePixelRatio = dpr;
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m_profileWidget->setFontPrintScale(0.8 * dpr);
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emit devicePixelRatioChanged();
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}
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}
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void QMLProfile::screenChanged(QScreen *screen)
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{
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setDevicePixelRatio(screen->devicePixelRatio());
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}
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