Add missing PathAdapter files

CURA-12176

include/PathAdapter.h

@@ -0,0 +1,63 @@
+// Copyright (c) 2024 Ultimaker B.V.
+// CuraEngine is released under the terms of the AGPLv3 or higher.
+
+#ifndef PATH_ADAPTER_H
+#define PATH_ADAPTER_H
+
+#include <stddef.h>
+
+#include "geometry/Point2LL.h"
+#include "utils/Coord_t.h"
+
+namespace cura
+{
+
+/* Adapter class to allow extrusion-related functions to work with either an ExtrusionLine or a Polygon */
+template<typename PathType>
+class PathAdapter
+{
+public:
+    /*!
+     * \brief Base constructor
+     * \param path The actual stored path
+     * \param fixed_line_width The fixed line width in case the stored path doesn't handle information about a variable
+     *                         line width. Can be omitted otherwise.
+     */
+    PathAdapter(const PathType& path, coord_t fixed_line_width = 0)
+        : path_(path)
+        , fixed_line_width_(fixed_line_width)
+    {
+    }
+
+    bool empty() const
+    {
+        return path_.empty();
+    }
+
+    size_t size() const
+    {
+        return path_.size();
+    }
+
+    coord_t length() const
+    {
+        return path_.length();
+    }
+
+    const Point2LL& pointAt(size_t index) const;
+
+    coord_t lineWidthAt(size_t index) const;
+
+    const PathType& getPath() const
+    {
+        return path_;
+    }
+
+private:
+    const PathType& path_;
+    const coord_t fixed_line_width_;
+};
+
+} // namespace cura
+
+#endif // PATH_ADAPTER_H

src/PathAdapter.cpp

@@ -0,0 +1,35 @@
+// Copyright (c) 2024 Ultimaker B.V.
+// CuraEngine is released under the terms of the AGPLv3 or higher.
+
+#include "PathAdapter.h"
+
+#include "utils/ExtrusionLine.h"
+
+namespace cura
+{
+
+template<>
+const Point2LL& PathAdapter<ExtrusionLine>::pointAt(size_t index) const
+{
+    return path_.junctions_.at(index).p_;
+}
+
+template<>
+coord_t PathAdapter<ExtrusionLine>::lineWidthAt(size_t index) const
+{
+    return path_.junctions_.at(index).w_;
+}
+
+template<>
+const Point2LL& PathAdapter<Polygon>::pointAt(size_t index) const
+{
+    return path_.at(index);
+}
+
+template<>
+coord_t PathAdapter<Polygon>::lineWidthAt(size_t /*index*/) const
+{
+    return fixed_line_width_;
+}
+
+} // namespace cura