/*
* Copyright (C) 2011-2015, Peter Abeles. All Rights Reserved.
*
* This file is part of Geometric Regression Library (GeoRegression).
*
* 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.
*/
package georegression.geometry;
import georegression.struct.line.LineSegment2D_I32;
/**
* @author Peter Abeles
*/
public class UtilLine2D_I32 {
/**
* Computes the acute angle between the two lines. Does not check for intersection
*
* @param line0 First line
* @param line1 Second line
* @return Acute angle in radians
*/
public static double acuteAngle( LineSegment2D_I32 line0 , LineSegment2D_I32 line1 ) {
int dx0 = line0.b.x - line0.a.x;
int dy0 = line0.b.y - line0.a.y;
int dx1 = line1.b.x - line1.a.x;
int dy1 = line1.b.y - line1.a.y;
double bottom = Math.sqrt(dx0*dx0 + dy0*dy0) * Math.sqrt(dx1*dx1 + dy1*dy1);
return Math.acos((dx0*dx1 + dy0*dy1)/bottom);
}
}