Add support for WCS

imageinfo.h

@@ -2,6 +2,8 @@
 #define IMAGEINFO_H
 
 #include <QTreeWidget>
+#include <wcslib/wcs.h>
+#include <cmath>
 
 struct FITSRecord
 {
@@ -11,10 +13,38 @@ struct FITSRecord
     bool editable() const;
 };
 
+class SkyPoint
+{
+    double ra = NAN;
+    double dec = NAN;
+public:
+    SkyPoint();
+    SkyPoint(double ra, double dec);
+    void set(double ra, double dec);
+    double RA() const { return ra; }
+    double DEC() const { return dec; }
+    QString toString() const;
+};
+
+class WCSData
+{
+    int nwcs = 0;
+    struct wcsprm *wcs = nullptr;
+    void freeWCS();
+public:
+    WCSData();
+    WCSData(char *header, int nrec);
+    ~WCSData();
+    SkyPoint pixelToWorld(QPointF pixel) const;
+    QPointF worldToPixel(SkyPoint point) const;
+    void calculateBounds(double &minRa, double &maxRa, double &minDec, double &maxDec);
+};
+
 struct ImageInfoData
 {
     QVector<FITSRecord> fitsHeader;
     QVector<QPair<QString, QString>> info;
+    std::shared_ptr<WCSData> wcs;
 };
 
 Q_DECLARE_METATYPE(ImageInfoData);