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diff --git a/src/ui/tools/dynamic-base.h b/src/ui/tools/dynamic-base.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef COMMON_CONTEXT_H_SEEN
+#define COMMON_CONTEXT_H_SEEN
+
+/*
+ * Common drawing mode. Base class of Eraser and Calligraphic tools.
+ *
+ * Authors:
+ *   Mitsuru Oka <oka326@parkcity.ne.jp>
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *
+ * The original dynadraw code:
+ *   Paul Haeberli <paul@sgi.com>
+ *
+ * Copyright (C) 1998 The Free Software Foundation
+ * Copyright (C) 1999-2002 authors
+ * Copyright (C) 2001-2002 Ximian, Inc.
+ * Copyright (C) 2008 Jon A. Cruz
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "ui/tools/tool-base.h"
+#include "display/curve.h"
+#include "display/control/canvas-item-ptr.h"
+
+#include <optional>
+
+class SPCurve;
+
+namespace Inkscape {
+    namespace XML {
+        class Node;
+    }
+}
+
+#define SAMPLING_SIZE 8        /* fixme: ?? */
+
+namespace Inkscape {
+
+class CanvasItemBpath;
+
+namespace UI {
+namespace Tools {
+
+class DynamicBase : public ToolBase {
+public:
+    DynamicBase(SPDesktop *desktop, std::string prefs_path, const std::string &cursor_filename);
+    ~DynamicBase() override;
+
+    void set(const Inkscape::Preferences::Entry& val) override;
+
+protected:
+    /** accumulated shape which ultimately goes in svg:path */
+    SPCurve accumulated;
+
+    /** canvas items for "committed" segments */
+    std::vector<CanvasItemPtr<CanvasItemBpath>> segments;
+
+    /** canvas item for red "leading" segment */
+    CanvasItemPtr<CanvasItemBpath> currentshape;
+
+    /** shape of red "leading" segment */
+    SPCurve currentcurve;
+
+    /** left edge of the stroke; combined to get accumulated */
+    SPCurve cal1;
+
+    /** right edge of the stroke; combined to get accumulated */
+    SPCurve cal2;
+
+    /** left edge points for this segment */
+    Geom::Point point1[SAMPLING_SIZE];
+
+    /** right edge points for this segment */
+    Geom::Point point2[SAMPLING_SIZE];
+
+    /** number of edge points for this segment */
+    gint npoints;
+
+    /* repr */
+    Inkscape::XML::Node *repr;
+
+    /* common */
+    Geom::Point cur;
+    Geom::Point vel;
+    double vel_max;
+    Geom::Point acc;
+    Geom::Point ang;
+    Geom::Point last;
+    Geom::Point del;
+
+    /* extended input data */
+    gdouble pressure;
+    gdouble xtilt;
+    gdouble ytilt;
+
+    /* attributes */
+    bool dragging;           /* mouse state: mouse is dragging */
+    bool usepressure;
+    bool usetilt;
+    double mass, drag;
+    double angle;
+    double width;
+
+    double vel_thin;
+    double flatness;
+    double tremor;
+    double cap_rounding;
+
+    bool is_drawing;
+
+    /** uses absolute width independent of zoom */
+    bool abs_width;
+
+	Geom::Point getViewPoint(Geom::Point n) const;
+	Geom::Point getNormalizedPoint(Geom::Point v) const;
+};
+
+}
+}
+}
+
+#endif // COMMON_CONTEXT_H_SEEN
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
+