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/*
* Copyright (C) 2014 Timo Vesalainen
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package org.vesalainen.math;
/**
*
* @author Timo Vesalainen
*/
public final class Vectors
{
/**
* Returns true if vector (x2, y2) is clockwise of (x1, y1)
* @param x1
* @param y1
* @param x2
* @param y2
* @return
*/
public static final boolean isClockwise(double x1, double y1, double x2, double y2)
{
return -x1*y2+x2*y1 > 0;
}
/**
* Returns true if vector (x2, y2) is clockwise of (x1, y1) in (ox, oy) centered
* coordinate.
* @param ox
* @param oy
* @param x1
* @param y1
* @param x2
* @param y2
* @return
*/
public static final boolean isClockwise(double ox, double oy, double x1, double y1, double x2, double y2)
{
return isClockwise(x1-ox, y1-oy, x2-ox, y2-oy);
}
/**
* Returns true if vector (x2, y2) is clockwise of (x1, y1)
* @param x1
* @param y1
* @param x2
* @param y2
* @return
*/
public static final boolean isCounterClockwise(double x1, double y1, double x2, double y2)
{
return -x1*y2+x2*y1 < 0;
}
/**
* Returns true if vector (x2, y2) is clockwise of (x1, y1) in (ox, oy) centered
* coordinate.
* @param ox
* @param oy
* @param x1
* @param y1
* @param x2
* @param y2
* @return
*/
public static final boolean isCounterClockwise(double ox, double oy, double x1, double y1, double x2, double y2)
{
return isCounterClockwise(x1-ox, y1-oy, x2-ox, y2-oy);
}
/**
* Returns true if vectors (x1, y1) and (x2, y2) are aligned (ox, oy) centered
* coordinate.
* @param ox
* @param oy
* @param x1
* @param y1
* @param x2
* @param y2
* @return
*/
public static final boolean areAligned(double ox, double oy, double x1, double y1, double x2, double y2)
{
return areAligned(x1-ox, y1-oy, x2-ox, y2-oy);
}
/**
* Returns true if vectors (x1, y1) and (x2, y2) are aligned
* @param x1
* @param y1
* @param x2
* @param y2
* @return
*/
public static final boolean areAligned(double x1, double y1, double x2, double y2)
{
return -x1*y2+x2*y1 == 0;
}
}
