com.dgzt.core.util.Box2DUtil.java Source code

Introduction

Here is the source code for com.dgzt.core.util.Box2DUtil.java

Source

/*
 * 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 <http://www.gnu.org/licenses/>.
 */
package com.dgzt.core.util;

import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.badlogic.gdx.physics.box2d.PolygonShape;
import com.badlogic.gdx.physics.box2d.World;

/**
 * Util for Box2D.
 * 
 * @author Dgzt
 */
public class Box2DUtil {

    // --------------------------------------------------
    // ~ Public static methods
    // --------------------------------------------------

    /**
     * Add box2D wall.
     * 
     * @param box2DWorld - The world of the Box2D.
     * @param x - The x coordinate value.
     * @param y - The y coordinate value.
     * @param width - The width value.
     * @param height - The height value.
     */
    public static void addWall(final World box2DWorld, final float x, final float y, final float width,
            final float height) {
        addRectangle(box2DWorld, x, y, width, height, false, null, BitsUtil.WALL_BITS,
                (short) (BitsUtil.BALL_BITS | BitsUtil.BUTTON_BITS));
    }

    /**
     * Add box2D rectangle sensor.
     * 
     * @param box2DWorld - The world of the Box2D.
     * @param x - The x coordinate value.
     * @param y - The x coordinate value.
     * @param width - The width value.
     * @param height - The height value.
     * @param userData - The user data of fixture.
     * @param categoryBits - The category bits of filter.
     * @param maskBits - The mask bits of filter.
     */
    public static void addSensor(final World box2dWorld, final float x, final float y, final float width,
            final float height, final Object userData, final short categoryBits, final short maskBits) {
        addRectangle(box2dWorld, x, y, width, height, true, userData, categoryBits, maskBits);
    }

    // --------------------------------------------------
    // ~ Private static methods
    // --------------------------------------------------

    /**
     * Add box2D rectangle.
     * 
     * @param box2DWorld - The world of the Box2D.
     * @param x - The x coordinate value.
     * @param y - The y coordinate value.
     * @param width - The width value.
     * @param height - The height value.
     * @param isSensor - Is the rectangle sensor?
     * @param userData - The user data of fixture.
     * @param categoryBits - The category bits of filter.
     * @param maskBits - The mask bits of filter.
     */
    private static void addRectangle(final World box2DWorld, final float x, final float y, final float width,
            final float height, final boolean isSensor, final Object userData, final short cateforyBits,
            final short maskBits) {
        final BodyDef bodyDef = new BodyDef();
        bodyDef.position.set(x + width / 2, y + height / 2);

        final Body body = box2DWorld.createBody(bodyDef);

        final PolygonShape shape = new PolygonShape();
        shape.setAsBox(width / 2, height / 2);

        final FixtureDef fixtureDef = new FixtureDef();
        fixtureDef.shape = shape;
        fixtureDef.density = 1.0f;
        fixtureDef.isSensor = isSensor;

        fixtureDef.filter.categoryBits = cateforyBits;
        fixtureDef.filter.maskBits = maskBits;

        final Fixture fixture = body.createFixture(fixtureDef);
        fixture.setUserData(userData);
    }

}