Implement FCurve evaluation

Uses a couple of helper classes to do the tricky mathematics.

Change-Id: I3245c0e282a5eeede3d596ca99ac2c78e34f23ef
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/src/animation/backend/fcurve_p.h b/src/animation/backend/fcurve_p.h
new file mode 100644
index 000000000..88990fb81
--- /dev/null
+++ b/src/animation/backend/fcurve_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT3DANIMATION_ANIMATION_FCURVE_P_H
+#define QT3DANIMATION_ANIMATION_FCURVE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "keyframe_p.h"
+#include "functionrangefinder_p.h"
+#include <QtCore/qvector.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DAnimation {
+namespace Animation {
+
+class Q_AUTOTEST_EXPORT FCurve
+{
+public:
+    FCurve();
+
+    int keyframeCount() const { return m_localTimes.size(); }
+    void appendKeyframe(float localTime, const Keyframe &keyframe);
+    void clearKeyframes() { m_localTimes.clear(); m_keyframes.clear(); }
+
+    const float &localTime(int index) const { return m_localTimes[index]; }
+    float &localTime(int index) { return m_localTimes[index]; }
+    const Keyframe &keyframe(int index) const { return m_keyframes[index]; }
+    Keyframe &keyframe(int index) { return m_keyframes[index]; }
+
+    float startTime() const;
+    float endTime() const;
+
+    float evaluateAtTime(float localTime) const;
+
+private:
+    QVector<float> m_localTimes;
+    QVector<Keyframe> m_keyframes;
+
+    FunctionRangeFinder m_rangeFinder;
+};
+
+} // namespace Animation
+} // namespace Qt3DAnimation
+
+QT_END_NAMESPACE
+
+#endif // QT3DANIMATION_ANIMATION_FCURVE_P_H