Added coordinates checking to file parsers

Refactoring

src/tile.h

@@ -0,0 +1,25 @@
+#ifndef TILE_H
+#define TILE_H
+
+#include <QPixmap>
+#include <QPoint>
+
+class Tile
+{
+public:
+	Tile(const QPoint &xy, int zoom)
+		{_xy = xy; _zoom = zoom;}
+
+	int zoom() const {return _zoom;}
+	const QPoint& xy() const {return _xy;}
+	QPixmap& pixmap() {return _pixmap;}
+
+	static int size() {return 256;}
+
+private:
+	int _zoom;
+	QPoint _xy;
+	QPixmap _pixmap;
+};
+
+#endif // TILE_H