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Properly handle skewed charts

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This commit is contained in:
Martin Tůma 2020-12-01 19:03:58 +01:00
parent 8423fc1230
commit df3ee11f42
2 changed files with 30 additions and 5 deletions
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31
src/map/bsbmap.cpp
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@ -157,6 +157,11 @@ bool BSBMap::parseKNP(const QByteArray &line, QString &datum, QString &proj,
_errorString = "Invalid KNP PP field";
return false;
}
_skew = parameter(map.value("SK"), &ok);
if (!ok) {
_errorString = "Invalid KNP SK field";
return false;
}
return true;
}
@ -253,8 +258,16 @@ bool BSBMap::readHeader(QFile &file)
return false;
}
bool BSBMap::createTransform(const QList<ReferencePoint> &points)
bool BSBMap::createTransform(QList<ReferencePoint> &points)
{
if (_skew > 0.0 && _skew < 360.0) {
QTransform matrix;
matrix.rotate(-_skew);
QTransform t(QImage::trueMatrix(matrix, _size.width(), _size.height()));
for (int i = 0; i < points.size(); i++)
points[i].setXY(t.map(points.at(i).xy().toPointF()));
}
_transform = Transform(points);
if (!_transform.isValid()) {
_errorString = _transform.errorString();
@ -400,7 +413,9 @@ Coordinates BSBMap::xy2ll(const QPointF &p)
QRectF BSBMap::bounds()
{
return QRectF(QPointF(0, 0), _size / _ratio);
return _skewSize.isValid()
? QRectF(QPointF(0, 0), _skewSize / _ratio)
: QRectF(QPointF(0, 0), _size / _ratio);
}
void BSBMap::draw(QPainter *painter, const QRectF &rect, Flags flags)
@ -420,8 +435,16 @@ void BSBMap::setDevicePixelRatio(qreal deviceRatio, qreal mapRatio)
void BSBMap::load()
{
if (!_img)
_img = new Image(readImage());
if (!_img) {
if (_skew > 0.0 && _skew < 360.0) {
QTransform matrix;
matrix.rotate(-_skew);
QImage img(readImage().transformed(matrix));
_skewSize = img.size();
_img = new Image(img);
} else
_img = new Image(readImage());
}
}
void BSBMap::unload()

4
src/map/bsbmap.h
View File

@ -42,7 +42,7 @@ private:
bool readHeader(QFile &file);
bool createProjection(const QString &datum, const QString &proj,
double params[9]);
bool createTransform(const QList<ReferencePoint> &points);
bool createTransform(QList<ReferencePoint> &points);
QImage readImage();
bool readRow(QFile &file, char bits, uchar *buf);
@ -50,8 +50,10 @@ private:
QString _name;
Projection _projection;
Transform _transform;
qreal _skew;
Image *_img;
QSize _size;
QSize _skewSize;
qreal _ratio;
qint64 _dataOffset;
QVector<QRgb> _palette;