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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>
#define MAX_PATHS 2
#define DEBUG_DECODER false
#define M_PI_F 3.14159265f
namespace latinime {
static inline float squareFloat(float x) {
return x * x;
}
static inline float getSquaredDistanceFloat(float x1, float y1, float x2, float y2) {
return squareFloat(x1 - x2) + squareFloat(y1 - y2);
}
static inline float getDistanceFloat(float x1, float y1, float x2, float y2) {
return hypotf(x1 - x2, y1 - y2);
}
static inline int getDistanceInt(int x1, int y1, int x2, int y2) {
return static_cast<int>(getDistanceFloat(static_cast<float>(x1), static_cast<float>(y1),
static_cast<float>(x2), static_cast<float>(y2)));
}
static inline float getAngle(int x1, int y1, int x2, int y2) {
const int dx = x1 - x2;
const int dy = y1 - y2;
if (dx == 0 && dy == 0) return 0;
return atan2f(static_cast<float>(dy), static_cast<float>(dx));
}
static inline float getAngleDiff(float a1, float a2) {
const float diff = fabsf(a1 - a2);
if (diff > M_PI_F) {
return 2.0f * M_PI_F - diff;
}
return diff;
}
// static float pointToLineSegSquaredDistanceFloat(
// float x, float y, float x1, float y1, float x2, float y2) {
// float A = x - x1;
// float B = y - y1;
// float C = x2 - x1;
// float D = y2 - y1;
// return fabsf(A * D - C * B) / sqrtf(C * C + D * D);
// }
static inline float pointToLineSegSquaredDistanceFloat(
float x, float y, float x1, float y1, float x2, float y2) {
const float ray1x = x - x1;
const float ray1y = y - y1;
const float ray2x = x2 - x1;
const float ray2y = y2 - y1;
const float dotProduct = ray1x * ray2x + ray1y * ray2y;
const float lineLengthSqr = squareFloat(ray2x) + squareFloat(ray2y);
const float projectionLengthSqr = dotProduct / lineLengthSqr;
float projectionX;
float projectionY;
if (projectionLengthSqr < 0.0f) {
projectionX = x1;
projectionY = y1;
} else if (projectionLengthSqr > 1.0f) {
projectionX = x2;
projectionY = y2;
} else {
projectionX = x1 + projectionLengthSqr * ray2x;
projectionY = y1 + projectionLengthSqr * ray2y;
}
return getSquaredDistanceFloat(x, y, projectionX, projectionY);
}
} // namespace latinime
#endif // LATINIME_GEOMETRY_UTILS_H
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