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Code cleanup

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This commit is contained in:
Martin Tůma 2017-08-15 13:36:18 +02:00
parent a7154988ab
commit a45125be9a
2 changed files with 34 additions and 25 deletions
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57
src/offlinemap.cpp
View File

@ -244,34 +244,31 @@ bool OfflineMap::createProjection(const QString &datum,
return true;
}
bool OfflineMap::computeTransformation(const QList<ReferencePoint> &points)
bool OfflineMap::simpleTransformation(const QList<ReferencePoint> &points)
{
Q_ASSERT(points.size() >= 2);
// translate + scale
if (points.size() == 2) {
if (points.at(0).xy.x() == points.at(1).xy.x()
|| points.at(0).xy.y() == points.at(1).xy.y()) {
_errorString = "Invalid reference points tuple";
return false;
}
QPointF p0(_projection->ll2xy(points.at(0).ll));
QPointF p1(_projection->ll2xy(points.at(1).ll));
qreal dX, dY, lat0, lon0;
dX = (p0.x() - p1.x()) / (points.at(0).xy.x() - points.at(1).xy.x());
dY = (p1.y() - p0.y()) / (points.at(1).xy.y() - points.at(0).xy.y());
lat0 = p0.y() - points.at(0).xy.y() * dY;
lon0 = p1.x() - points.at(1).xy.x() * dX;
_transform = QTransform(1.0/dX, 0, 0, 1.0/dY, -lon0/dX, -lat0/dY);
_inverted = _transform.inverted();
return true;
if (points.at(0).xy.x() == points.at(1).xy.x()
|| points.at(0).xy.y() == points.at(1).xy.y()) {
_errorString = "Invalid reference points tuple";
return false;
}
// full affine transformation (least squares method)
QPointF p0(_projection->ll2xy(points.at(0).ll));
QPointF p1(_projection->ll2xy(points.at(1).ll));
qreal dX, dY, lat0, lon0;
dX = (p0.x() - p1.x()) / (points.at(0).xy.x() - points.at(1).xy.x());
dY = (p1.y() - p0.y()) / (points.at(1).xy.y() - points.at(0).xy.y());
lat0 = p0.y() - points.at(0).xy.y() * dY;
lon0 = p1.x() - points.at(1).xy.x() * dX;
_transform = QTransform(1.0/dX, 0, 0, 1.0/dY, -lon0/dX, -lat0/dY);
_inverted = _transform.inverted();
return true;
}
bool OfflineMap::affineTransformation(const QList<ReferencePoint> &points)
{
Matrix c(3, 2);
c.zeroize();
for (size_t i = 0; i < c.h(); i++) {
@ -317,6 +314,16 @@ bool OfflineMap::computeTransformation(const QList<ReferencePoint> &points)
return true;
}
bool OfflineMap::computeTransformation(const QList<ReferencePoint> &points)
{
Q_ASSERT(points.size() >= 2);
if (points.size() == 2)
return simpleTransformation(points);
else
return affineTransformation(points);
}
bool OfflineMap::computeResolution(QList<ReferencePoint> &points)
{
Q_ASSERT(points.count() >= 2);

2
src/offlinemap.h
View File

@ -75,6 +75,8 @@ private:
bool totalSizeSet();
bool createProjection(const QString &datum, const QString &projection,
const ProjectionSetup &setup, QList<ReferencePoint> &points);
bool simpleTransformation(const QList<ReferencePoint> &points);
bool affineTransformation(const QList<ReferencePoint> &points);
bool computeTransformation(const QList<ReferencePoint> &points);
bool computeResolution(QList<ReferencePoint> &points);
bool getTileInfo(const QStringList &tiles, const QString &path = QString());