Add support for WCS

imageinfo.cpp

@@ -1,6 +1,9 @@
 #include "imageinfo.h"
 #include <QSettings>
+#include <QTime>
 #include <QHeaderView>
+#include <wcslib/wcshdr.h>
+#include <wcslib/wcsfix.h>
 
 static const QVector<QByteArray> noEditableKey = {"SIMPLE", "BITPIX", "NAXIS", "NAXIS1", "NAXIS2", "NAXIS3", "EXTEND", "BZERO", "BSCALE"};
 
@@ -47,3 +50,90 @@ void ImageInfo::setInfo(const ImageInfoData &info)
     }
     expandAll();
 }
+
+void WCSData::freeWCS()
+{
+    wcsvfree(&nwcs, &wcs);
+    nwcs = 0;
+    wcs = nullptr;
+}
+
+WCSData::WCSData(char *header, int nrec)
+{
+    int stat[NWCSFIX];
+    int nreject = 0;
+    int status = wcspih(header, nrec, 1, 0, &nreject, &nwcs, &wcs);
+    if(status != 0)
+    {
+        freeWCS();
+        return;
+    }
+    status = wcsfix(0, 0, wcs, stat);
+    if(status != 0 || wcs->crpix[0] == 0)
+        freeWCS();
+}
+
+WCSData::~WCSData()
+{
+    if(wcs)
+        freeWCS();
+}
+
+SkyPoint WCSData::pixelToWorld(QPointF pixel) const
+{
+    if(wcs == nullptr)return SkyPoint();
+    double pixcrd[2] = {pixel.x(), pixel.y()};
+    double imgcrd[8] = {0};
+    double phi = 0;
+    double theta = 0;
+    double world[8] = {0};
+    int stat[NWCSFIX] = {0};
+    int status = wcsp2s(wcs, 1, 2, pixcrd, imgcrd, &phi, &theta, world, stat);
+    if(status == 0)
+    {
+        return SkyPoint(world[0], world[1]);
+    }
+    return SkyPoint();
+}
+
+QPointF WCSData::worldToPixel(SkyPoint point) const
+{
+    return QPointF();
+}
+
+void WCSData::calculateBounds(double &minRa, double &maxRa, double &minDec, double &maxDec)
+{
+    minRa = -1000;
+    maxRa = 1000;
+    minDec = -1000;
+    maxDec = 1000;
+}
+
+SkyPoint::SkyPoint() : ra(NAN), dec(NAN)
+{
+
+}
+
+SkyPoint::SkyPoint(double ra, double dec) : ra(ra), dec(dec)
+{
+}
+
+void SkyPoint::set(double ra, double dec)
+{
+    this->ra = ra;
+    this->dec = dec;
+}
+
+QString SkyPoint::toString() const
+{
+    if(std::isnan(ra) || std::isnan(dec))
+        return QString();
+
+    QTime t(0, 0);
+    t = t.addSecs(ra * 240);
+
+    double deg, min, sec;
+    min = std::modf(dec, &deg) * 60;
+    sec = std::modf(min, &min) * 60;
+    return QString("RA: %1 DEC: %2° %3' %4\"").arg(t.toString("HH'h' mm'm' ss's'")).arg(deg, 2, 'f', 0, '0').arg(min, 2, 'f', 0, '0').arg(sec, 2, 'f', 0, '0');
+}