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Added support for matrix-defined transformations

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Fixed transformation matrix computation
This commit is contained in:
Martin Tůma 2018-01-10 01:28:40 +01:00
parent bffd1d9172
commit 045cbe81bf
2 changed files with 41 additions and 19 deletions
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47
src/map/geotiff.cpp
View File

@ -58,7 +58,7 @@ typedef struct {
} KeyEntry;
bool GeoTIFF::readEntry(TIFFFile &file, Ctx &ctx)
bool GeoTIFF::readEntry(TIFFFile &file, Ctx &ctx) const
{
quint16 tag;
quint16 type;
@ -105,7 +105,7 @@ bool GeoTIFF::readEntry(TIFFFile &file, Ctx &ctx)
return true;
}
bool GeoTIFF::readIFD(TIFFFile &file, quint32 &offset, Ctx &ctx)
bool GeoTIFF::readIFD(TIFFFile &file, quint32 &offset, Ctx &ctx) const
{
quint16 count;
@ -124,7 +124,7 @@ bool GeoTIFF::readIFD(TIFFFile &file, quint32 &offset, Ctx &ctx)
return true;
}
bool GeoTIFF::readScale(TIFFFile &file, quint32 offset, QPointF &scale)
bool GeoTIFF::readScale(TIFFFile &file, quint32 offset, QPointF &scale) const
{
if (!file.seek(offset))
return false;
@ -138,7 +138,7 @@ bool GeoTIFF::readScale(TIFFFile &file, quint32 offset, QPointF &scale)
}
bool GeoTIFF::readTiepoints(TIFFFile &file, quint32 offset, quint32 count,
QList<ReferencePoint> &points)
QList<ReferencePoint> &points) const
{
double z, pz;
QPointF xy, pp;
@ -170,7 +170,19 @@ bool GeoTIFF::readTiepoints(TIFFFile &file, quint32 offset, quint32 count,
return true;
}
bool GeoTIFF::readKeys(TIFFFile &file, Ctx &ctx, QMap<quint16, Value> &kv)
bool GeoTIFF::readMatrix(TIFFFile &file, quint32 offset, double matrix[16]) const
{
if (!file.seek(offset))
return false;
for (int i = 0; i < 16; i++)
if (!file.readValue(matrix[i]))
return false;
return true;
}
bool GeoTIFF::readKeys(TIFFFile &file, Ctx &ctx, QMap<quint16, Value> &kv) const
{
Header header;
KeyEntry entry;
@ -233,7 +245,7 @@ bool GeoTIFF::readKeys(TIFFFile &file, Ctx &ctx, QMap<quint16, Value> &kv)
}
bool GeoTIFF::readGeoValue(TIFFFile &file, quint32 offset, quint16 index,
double &val)
double &val) const
{
qint64 pos = file.pos();
@ -419,17 +431,18 @@ bool GeoTIFF::load(const QString &path)
return false;
break;
case ModelTypeGeocentric:
_errorString = "TODO ModelTypeGeocentric";
_errorString = "Geocentric models are not supported";
return false;
default:
_errorString = "Unknown/missing model type";
return false;
}
if (ctx.scale && ctx.tiepoints)
_transform = QTransform(scale.x(), 0, 0, -scale.y(),
points.first().pp.x(), points.first().pp.y()).inverted();
else if (ctx.tiepointCount > 1) {
if (ctx.scale && ctx.tiepoints) {
const ReferencePoint &p = points.first();
_transform = QTransform(scale.x(), 0, 0, -scale.y(), p.pp.x() - p.xy.x()
/ scale.x(), p.pp.y() + p.xy.x() / scale.y()).inverted();
} else if (ctx.tiepointCount > 1) {
Transform t(points);
if (t.isNull()) {
_errorString = t.errorString();
@ -437,8 +450,16 @@ bool GeoTIFF::load(const QString &path)
}
_transform = t.transform();
} else if (ctx.matrix) {
_errorString = "TODO ModelTransformationTag";
return false;
double m[16];
if (!readMatrix(file, ctx.matrix, m)) {
_errorString = "Error reading transformation matrix";
return false;
}
if (m[2] != 0.0 || m[6] != 0.0 || m[8] != 0.0 || m[9] != 0.0
|| m[10] != 0.0 || m[11] != 0.0) {
_errorString = "Not a baseline transformation matrix";
}
_transform = QTransform(m[0], m[1], m[4], m[5], m[3], m[7]).inverted();
} else {
_errorString = "Incomplete/missing model transformation info";
return false;

13
src/map/geotiff.h
View File

@ -40,14 +40,15 @@ private:
values(0) {}
};
bool readEntry(TIFFFile &file, Ctx &ctx);
bool readIFD(TIFFFile &file, quint32 &offset, Ctx &ctx);
bool readScale(TIFFFile &file, quint32 offset, QPointF &scale);
bool readEntry(TIFFFile &file, Ctx &ctx) const;
bool readIFD(TIFFFile &file, quint32 &offset, Ctx &ctx) const;
bool readScale(TIFFFile &file, quint32 offset, QPointF &scale) const;
bool readTiepoints(TIFFFile &file, quint32 offset, quint32 count,
QList<ReferencePoint> &points);
bool readKeys(TIFFFile &file, Ctx &ctx, QMap<quint16, Value> &kv);
QList<ReferencePoint> &points) const;
bool readMatrix(TIFFFile &file, quint32 offset, double matrix[16]) const;
bool readKeys(TIFFFile &file, Ctx &ctx, QMap<quint16, Value> &kv) const;
bool readGeoValue(TIFFFile &file, quint32 offset, quint16 index,
double &val);
double &val) const;
Datum datum(QMap<quint16, Value> &kv);
Projection::Method method(QMap<quint16, Value> &kv);