com.tnf.ptm.entities.projectile.PointProjectileBody.java Source code

Introduction

Here is the source code for com.tnf.ptm.entities.projectile.PointProjectileBody.java

Source

/*
 * Copyright 2017 TheNightForum
 *
 * 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 com.tnf.ptm.entities.projectile;

import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.physics.box2d.RayCastCallback;
import com.tnf.ptm.common.Const;
import com.tnf.ptm.common.PtmMath;
import com.tnf.ptm.common.PtmObject;
import com.tnf.ptm.entities.ship.PtmShip;
import com.tnf.ptm.common.PtmGame;

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,
            PtmGame game, float acc) {
        myPos = new Vector2(muzzlePos);
        mySpd = new Vector2();
        PtmMath.fromAl(mySpd, angle, spdLen);
        mySpd.add(gunSpd);
        myRayBack = new MyRayBack(projectile, game);
        myAcc = acc;
    }

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

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

    @Override
    public void receiveForce(Vector2 force, PtmGame 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(PtmGame game) {
    }

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

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

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

    private class MyRayBack implements RayCastCallback {

        private final Projectile myProjectile;
        private final PtmGame myGame;

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

        @Override
        public float reportRayFixture(Fixture fixture, Vector2 point, Vector2 normal, float fraction) {
            PtmObject o = (PtmObject) 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;
        }
    }
}