Refractor drawing grid

imageinfodata.h

@@ -5,6 +5,7 @@
 #include <QPointF>
 #include <QVector>
 #include <QVariant>
+#include <QPainterPath>
 #include <wcslib/wcs.h>
 #include <cmath>
 #include <memory>
@@ -53,6 +54,14 @@ struct SkyPointScale
     double scaleHigh = 10000.0;
 };
 
+struct SkyGrid
+{
+    bool empty = true;
+    QPainterPath grid;
+    QVector<QPair<QPointF, QString>> text;
+    void clear();
+};
+
 class WCSDataT
 {
     int nwcs = 0;
@@ -70,6 +79,7 @@ public:
     void calculateBounds(double &minRa, double &maxRa, double &minDec, double &maxDec, double &crVal1, double &crVal2) const;
     bool valid() const { return wcs; };
     SkyPointScale getRaDecScale() const;
+    SkyGrid prepareGrid(uint32_t w, uint32_t h);
 };
 
 struct ImageInfoData