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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LATINIME_GEOMETRY_UTILS_H
#define LATINIME_GEOMETRY_UTILS_H
#include <cmath>
#include "defines.h"
#define ROUND_FLOAT_10000(f) ((f) < 1000.0f && (f) > 0.001f) \
? (floorf((f) * 10000.0f) / 10000.0f) : (f)
namespace latinime {
class GeometryUtils {
public:
static inline float SQUARE_FLOAT(const float x) { return x * x; }
static AK_FORCE_INLINE float getAngle(const int x1, const int y1, const int x2, const int y2) {
const int dx = x1 - x2;
const int dy = y1 - y2;
if (dx == 0 && dy == 0) return 0.0f;
return atan2f(static_cast<float>(dy), static_cast<float>(dx));
}
static AK_FORCE_INLINE float getAngleDiff(const float a1, const float a2) {
static const float M_2PI_F = M_PI * 2.0f;
float delta = fabsf(a1 - a2);
if (delta > M_2PI_F) {
delta -= (M_2PI_F * static_cast<int>(delta / M_2PI_F));
}
if (delta > M_PI_F) {
delta = M_2PI_F - delta;
}
return ROUND_FLOAT_10000(delta);
}
static AK_FORCE_INLINE int getDistanceInt(const int x1, const int y1, const int x2,
const int y2) {
return static_cast<int>(hypotf(static_cast<float>(x1 - x2), static_cast<float>(y1 - y2)));
}
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(GeometryUtils);
};
} // namespace latinime
#endif // LATINIME_GEOMETRY_UTILS_H
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