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diff --git a/src/object/sp-linear-gradient.h b/src/object/sp-linear-gradient.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#ifndef SP_LINEAR_GRADIENT_H
+#define SP_LINEAR_GRADIENT_H
+
+/** \file
+ * SPLinearGradient: SVG <lineargradient> implementation
+ */
+
+#include "sp-gradient.h"
+#include "svg/svg-length.h"
+
+/** Linear gradient. */
+class SPLinearGradient : public SPGradient {
+public:
+ SPLinearGradient();
+ ~SPLinearGradient() override;
+
+ SVGLength x1;
+ SVGLength y1;
+ SVGLength x2;
+ SVGLength y2;
+
+ cairo_pattern_t* pattern_new(cairo_t *ct, Geom::OptRect const &bbox, double opacity) override;
+
+protected:
+ void build(SPDocument *document, Inkscape::XML::Node *repr) override;
+ void set(SPAttr key, char const *value) override;
+ void update(SPCtx *ctx, guint flags) override;
+ Inkscape::XML::Node* write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, unsigned int flags) override;
+};
+
+MAKE_SP_OBJECT_DOWNCAST_FUNCTIONS(SP_LINEARGRADIENT, SPLinearGradient)
+MAKE_SP_OBJECT_TYPECHECK_FUNCTIONS(SP_IS_LINEARGRADIENT, SPLinearGradient)
+
+#endif /* !SP_LINEAR_GRADIENT_H */
+
+/*
+ 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 :