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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef Rotation_h
#define Rotation_h
#include "platform/geometry/FloatPoint3D.h"
namespace blink {
struct PLATFORM_EXPORT Rotation {
Rotation() : axis(0, 0, 0), angle(0) {}
Rotation(const FloatPoint3D& axis, double angle) : axis(axis), angle(angle) {}
// If either rotation is effectively "zero" or both rotations share the same
// normalized axes this function returns true and the "non-zero" axis is
// returned as resultAxis and the effective angles are returned as
// resultAngleA and resultAngleB. Otherwise false is returned.
static bool getCommonAxis(const Rotation& /*a*/,
const Rotation& /*b*/,
FloatPoint3D& resultAxis,
double& resultAngleA,
double& resultAngleB);
// A progress of 0 corresponds to "from" and a progress of 1 corresponds to
// "to".
static Rotation slerp(const Rotation& from,
const Rotation& to,
double progress);
// Returns a rotation whose effect is equivalent to applying a followed by b.
static Rotation add(const Rotation& /*a*/, const Rotation& /*b*/);
// No restrictions on the axis vector.
FloatPoint3D axis;
// Measured in degrees.
double angle;
};
} // namespace blink
#endif // Rotation_h
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