org.destinationsol.game.projectile.PointProjectileBody.java Source code

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Here is the source code for org.destinationsol.game.projectile.PointProjectileBody.java

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/*
 * Copyright 2015 MovingBlocks
 *
 * 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 org.destinationsol.game.projectile;

import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.physics.box2d.RayCastCallback;
import org.destinationsol.Const;
import org.destinationsol.common.SolMath;
import org.destinationsol.game.SolGame;
import org.destinationsol.game.SolObject;
import org.destinationsol.game.ship.SolShip;

public class PointProjectileBody implements ProjectileBody {
    private final Vector2 myPos;
    private final Vector2 mySpd;
    private final MyRayBack myRayBack;
    private final float myAcc;

    public PointProjectileBody(float angle, Vector2 muzzlePos, Vector2 gunSpd, float spdLen, Projectile projectile,
            SolGame game, float acc) {
        myPos = new Vector2(muzzlePos);
        mySpd = new Vector2();
        SolMath.fromAl(mySpd, angle, spdLen);
        mySpd.add(gunSpd);
        myRayBack = new MyRayBack(projectile, game);
        myAcc = acc;
    }

    @Override
    public void update(SolGame game) {
        if (myAcc > 0 && SolMath.canAccelerate(myAcc, mySpd)) {
            float spdLen = mySpd.len();
            if (spdLen < Const.MAX_MOVE_SPD) {
                mySpd.scl((spdLen + myAcc) / spdLen);
            }
        }
        Vector2 prevPos = SolMath.getVec(myPos);
        Vector2 diff = SolMath.getVec(mySpd);
        diff.scl(game.getTimeStep());
        myPos.add(diff);
        SolMath.free(diff);
        game.getObjMan().getWorld().rayCast(myRayBack, prevPos, myPos);
        SolMath.free(prevPos);
    }

    @Override
    public Vector2 getPos() {
        return myPos;
    }

    @Override
    public void receiveForce(Vector2 force, SolGame game, boolean acc) {
        force.scl(game.getTimeStep());
        if (!acc)
            force.scl(10f);
        mySpd.add(force);
    }

    @Override
    public Vector2 getSpd() {
        return mySpd;
    }

    @Override
    public void onRemove(SolGame game) {
    }

    @Override
    public float getAngle() {
        return SolMath.angle(mySpd);
    }

    @Override
    public void changeAngle(float diff) {
        SolMath.rotate(mySpd, diff);
    }

    @Override
    public float getDesiredAngle(SolShip ne) {
        return SolMath.angle(myPos, ne.getPosition());
    }

    private class MyRayBack implements RayCastCallback {

        private final Projectile myProjectile;
        private final SolGame myGame;

        private MyRayBack(Projectile projectile, SolGame game) {
            myProjectile = projectile;
            myGame = game;
        }

        @Override
        public float reportRayFixture(Fixture fixture, Vector2 point, Vector2 normal, float fraction) {
            SolObject o = (SolObject) fixture.getBody().getUserData();
            boolean oIsMassless = o instanceof Projectile && ((Projectile) o).isMassless();
            if (!oIsMassless && myProjectile.shouldCollide(o, fixture, myGame.getFactionMan())) {
                myPos.set(point);
                myProjectile.setObstacle(o, myGame);
                return 0;
            }
            return -1;
        }
    }
}