98 lines
3 KiB
C++
98 lines
3 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LATINIME_GEOMETRY_UTILS_H
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#define LATINIME_GEOMETRY_UTILS_H
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#include <cmath>
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#define MAX_DISTANCE 10000000
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#define MAX_PATHS 2
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#define DEBUG_DECODER false
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#define M_PI_F 3.14159265f
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namespace latinime {
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static inline float squareFloat(float x) {
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return x * x;
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}
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static inline float getSquaredDistanceFloat(float x1, float y1, float x2, float y2) {
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return squareFloat(x1 - x2) + squareFloat(y1 - y2);
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}
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static inline float getDistanceFloat(float x1, float y1, float x2, float y2) {
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return hypotf(x1 - x2, y1 - y2);
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}
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static inline int getDistanceInt(int x1, int y1, int x2, int y2) {
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return static_cast<int>(getDistanceFloat(static_cast<float>(x1), static_cast<float>(y1),
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static_cast<float>(x2), static_cast<float>(y2)));
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}
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static inline float getAngle(int x1, int y1, int x2, int y2) {
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const int dx = x1 - x2;
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const int dy = y1 - y2;
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if (dx == 0 && dy == 0) return 0;
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return atan2f(static_cast<float>(dy), static_cast<float>(dx));
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}
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static inline float getAngleDiff(float a1, float a2) {
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const float diff = fabsf(a1 - a2);
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if (diff > M_PI_F) {
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return 2.0f * M_PI_F - diff;
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}
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return diff;
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}
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// static float pointToLineSegSquaredDistanceFloat(
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// float x, float y, float x1, float y1, float x2, float y2) {
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// float A = x - x1;
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// float B = y - y1;
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// float C = x2 - x1;
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// float D = y2 - y1;
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// return fabsf(A * D - C * B) / sqrtf(C * C + D * D);
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// }
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static inline float pointToLineSegSquaredDistanceFloat(
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float x, float y, float x1, float y1, float x2, float y2) {
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const float ray1x = x - x1;
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const float ray1y = y - y1;
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const float ray2x = x2 - x1;
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const float ray2y = y2 - y1;
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const float dotProduct = ray1x * ray2x + ray1y * ray2y;
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const float lineLengthSqr = squareFloat(ray2x) + squareFloat(ray2y);
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const float projectionLengthSqr = dotProduct / lineLengthSqr;
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float projectionX;
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float projectionY;
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if (projectionLengthSqr < 0.0f) {
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projectionX = x1;
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projectionY = y1;
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} else if (projectionLengthSqr > 1.0f) {
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projectionX = x2;
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projectionY = y2;
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} else {
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projectionX = x1 + projectionLengthSqr * ray2x;
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projectionY = y1 + projectionLengthSqr * ray2y;
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}
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return getSquaredDistanceFloat(x, y, projectionX, projectionY);
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}
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} // namespace latinime
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#endif // LATINIME_GEOMETRY_UTILS_H
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