org.ams.physics.things.Circle.java Source code

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Here is the source code for org.ams.physics.things.Circle.java

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/*
 *
 *  The MIT License (MIT)
 *
 *  Copyright (c) <2015> <Andreas Modahl>
 *
 *  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 org.ams.physics.things;

import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.physics.box2d.CircleShape;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.utils.Array;
import org.ams.physics.things.def.CircleDef;
import org.ams.physics.things.def.ThingDef;
import org.ams.physics.world.BoxWorld;

/**
 * @author Andreas
 */
public class Circle extends AbstractThingWithBody implements ThingWithBody {

    public float radius;

    private final Rectangle physicsBoundingBox = new Rectangle();

    public Circle(CircleDef def) {
        super(def);

        initFromDefinition(def);

        postInstantiation(def);
    }

    protected void initFromDefinition(CircleDef def) {
        this.radius = def.radius;
    }

    @Override
    public void thingHasBeenAddedToBoxWorld(BoxWorld boxWorld) {
        // the body is created in this supercall
        super.thingHasBeenAddedToBoxWorld(boxWorld);

        // the last thing to do is to create fixtures
        updateFixtures();

    }

    private void updateFixtures() {
        Array<Fixture> fixtures = body.getFixtureList();
        for (Fixture fixture : fixtures) {
            body.destroyFixture(fixture);
        }

        CircleShape shape = new CircleShape();
        shape.setRadius(radius);
        fixtureDef.shape = shape;
        Fixture fixture = body.createFixture(fixtureDef);
        fixture.setUserData(this);
        shape.dispose();
    }

    @Override
    public String toString() {
        return "C" + getID() + " R" + radius;
    }

    @Override
    public Rectangle getPhysicsBoundingBox() {
        physicsBoundingBox.x = body.getPosition().x;
        physicsBoundingBox.x -= radius;
        physicsBoundingBox.width = radius * 2f;

        physicsBoundingBox.y = body.getPosition().y;
        physicsBoundingBox.y -= radius;
        physicsBoundingBox.height = radius * 2f;

        return physicsBoundingBox;
    }

    public void setRadius(float radius) {
        boolean needsUpdate = this.radius != radius;

        if (!needsUpdate)
            return;

        this.radius = radius;
        if (boxWorld != null)
            updateFixtures();

    }

}