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diff --git a/src/curveeditor/detail/curvesegment.h b/src/curveeditor/detail/curvesegment.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Design Tooling
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "keyframe.h"
+
+#include <vector>
+
+class QPointF;
+
+namespace DesignTools {
+
+class CurveSegment
+{
+public:
+    CurveSegment();
+
+    CurveSegment(const Keyframe &first, const Keyframe &last);
+
+    bool containsX(double x) const;
+
+    QPointF evaluate(double t) const;
+
+    std::vector<QPointF> extrema() const;
+
+    std::vector<double> yForX(double x) const;
+
+    std::vector<double> xForY(double y) const;
+
+    void setLeft(const Keyframe &frame);
+
+    void setRight(const Keyframe &frame);
+
+private:
+    Keyframe m_left;
+
+    Keyframe m_right;
+};
+
+} // End namespace DesignTools.