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a JNI interface to Jolt Physics
There is a newer version: 0.9.3
/*
Copyright (c) 2024 Stephen Gold

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 */
package com.github.stephengold.joltjni;

/**
 * A type of {@code Constraint} that joins 2 bodies.
 *
 * @author Stephen Gold [email protected]
 */
abstract public class TwoBodyConstraint extends Constraint {
    // *************************************************************************
    // constructors

    /**
     * Instantiate a constraint with the specified native object assigned but
     * not owned.
     *
     * @param constraintVa the virtual address of the native object to assign
     * (not zero)
     */
    TwoBodyConstraint(long constraintVa) {
        super(constraintVa);
    }
    // *************************************************************************
    // new methods exposed

    /**
     * Access the first body in the constraint. The constraint is unaffected.
     *
     * @return a new JVM object with the pre-existing native object assigned
     */
    public Body getBody1() {
        long constraintVa = va();
        long bodyVa = getBody1(constraintVa);
        Body result = new Body(bodyVa);

        return result;
    }

    /**
     * Access the 2nd body in the constraint. The constraint is unaffected.
     *
     * @return a new JVM object with the pre-existing native object assigned
     */
    public Body getBody2() {
        long constraintVa = va();
        long bodyVa = getBody2(constraintVa);
        Body result = new Body(bodyVa);

        return result;
    }

    /**
     * Calculate the coordinate transform from constraint space to body 1. The
     * constraint is unaffected.
     *
     * @return a new transform matrix
     */
    public Mat44 getConstraintToBody1Matrix() {
        long constraintVa = va();
        long matrixVa = getConstraintToBody1Matrix(constraintVa);
        Mat44 result = new Mat44(matrixVa, true);

        return result;
    }

    /**
     * Calculate the coordinate transform from constraint space to body 2. The
     * constraint is unaffected.
     *
     * @return a new transform matrix
     */
    public Mat44 getConstraintToBody2Matrix() {
        long constraintVa = va();
        long matrixVa = getConstraintToBody2Matrix(constraintVa);
        Mat44 result = new Mat44(matrixVa, true);

        return result;
    }
    // *************************************************************************
    // native private methods

    native private static long getBody1(long constraintVa);

    native private static long getBody2(long constraintVa);

    native private static long getConstraintToBody1Matrix(long constraintVa);

    native private static long getConstraintToBody2Matrix(long constraintVa);
}