由于某种原因，我的 Box2d 对象代码在一个类中工作，但在另一个类中不起作用，即使它与我读过的代码完全相同，它与导入正确的库有关，但该库已正确导入，但但它仍然不起作用。我有点绝望，不知道该怎么办，说实话，也许这里有人可以给我指点。我知道这是很多代码，但我真的不知道该怎么做，我希望有人能给我指点，也许我只是忽略了一些东西
这是带有对象的代码:
public class Tank extends Sprite implements Renderable, PhysicsObject, Updatable {
public Body body;
public Sprite SpriteBody;
public Sprite SpriteTurret;
public Playscreen playScreen;
public InputProvider input;
public Vector2 aim;
public int readytoshoot=0;
public float canonrotation;
public World world;
public Body b2Body;
TextureRegion TankBlues;
SpriteBatch sb;
public Texture texture;
public Texture arm;
Sprite sprite;
Sprite sparm;
int horizontalForce;
float dt;
float Richtung;
float Speed = 2f;
public float Radius;
private TankType type;
public ArrayList<Flower> flowers;
float PosX,PosY;
Body TankBody,CanonBody;
RevoluteJoint joint;
private Map<ControlSpecification, Integer> controlMap;
private boolean useController;
private int currentLife;
private int maxLife;
private int fullLifeWidth;
// Playscreen playscreen, Vector2 aim, Input Inputprovider,
public Tank(World world, Playscreen screen, SurvivalMode2 survivalMode, TankType tankType) {
flowers = new ArrayList<Flower>();
// super(screen.getAtlas().findRegion("tankBody_blue"));
this.world = world;
canonrotation=0;
// TankBlues = new TextureRegion(getTexture(),0,0 , 46,46);
// setBounds(0, 0, 46 / SEPGame.PPM, 46 / SEPGame.PPM);
// setRegion(TankBlues);
sb = new SpriteBatch();
texture = new Texture(Gdx.files.internal("tankBody_.png"));
arm = new Texture(Gdx.files.internal("b-tankBlue_barrel2_outline.png"));
sprite = new Sprite(texture);
sparm = new Sprite(arm);
PosX=Gdx.graphics.getWidth() / 2 ;
PosY= Gdx.graphics.getHeight() / 2;
sprite.setPosition(PosX,PosY);
sparm.setPosition(Gdx.graphics.getWidth() / 2 - sprite.getWidth() / 2, Gdx.graphics.getHeight() / 2);
useController = false;
// defineTank();
// registerController();
controlMap = StandardControlSpecification.getMapping(tankType);
this.type = tankType;
// defineTank();
// registerController();
// TankBody erstellen
BodyDef bodyDef = new BodyDef();
bodyDef.type = BodyType.DynamicBody;
bodyDef.position.set(PosX, PosY);
PolygonShape shape = new PolygonShape();
shape.setAsBox(sprite.getWidth()/2-1, sprite.getHeight()/2-1);
Radius=(float)Math.sqrt((double)(sprite.getWidth()*sprite.getWidth()/4+sprite.getHeight()*sprite.getHeight()/4) );
FixtureDef fixDef = new FixtureDef();
fixDef.shape = shape;
fixDef.density = 1f;
fixDef.restitution = .1f;
fixDef.friction = .5f;
TankBody = world.createBody(bodyDef);
TankBody.createFixture(fixDef);
TankBody.setLinearDamping(2f);
TankBody.setAngularDamping(2f);
TankBody.setUserData(42);
this.type = tankType;
maxLife = 100;
currentLife = maxLife;
fullLifeWidth = 300;
}
public Rectangle getRect() {
Rectangle Rectanlge = new Rectangle(sprite.getX(), sprite.getY(), sprite.getWidth(), sprite.getHeight());
return Rectanlge;
}
private void registerController() {
for (Controller controller : Controllers.getControllers()) {
controller.addListener(new GamepadInputProvider(this));
}
}
public float getX() {
return sprite.getX();
}
public float getY() {
return sprite.getY();
}
public float getRotation() {
return sparm.getRotation();
}
public void collision() {
}
public void takeDamage(int damage) {
currentLife -= damage;
}
public void defineTank() { //verwenden wir net physic engine
BodyDef bDef = new BodyDef();
bDef.position.set(sprite.getX(), sprite.getY());
bDef.type = BodyDef.BodyType.DynamicBody;
b2Body = world.createBody(bDef);
FixtureDef fDef = new FixtureDef();
PolygonShape shape = new PolygonShape();
shape.setAsBox(70, 70);
// fDef.density = 1f;
fDef.shape = shape;
b2Body.createFixture(fDef);
}
public void render()
{
sb.begin();
float x=TankBody.getPosition().x-sprite.getWidth()/2;
float y=TankBody.getPosition().y-sprite.getHeight()/2;
sprite.setPosition(x, y);
sprite.setRotation((float)(TankBody.getAngle()/Math.PI*180f));
sparm.setPosition(x, y);
sparm.setRotation((float)(TankBody.getAngle()/Math.PI*180f+canonrotation) );
sprite.draw(sb);
sparm.draw(sb);
sb.end();
Flower destroy = null;
boolean del=false;
for (Flower flower : flowers)
{
if(flower.todelete==0)
{
del=true;
destroy=flower;
}
else
{
flower.render();
}
}
if(del)
{
flowers.remove(destroy);
destroy.delete();
del=false;
}
renderLifebar();
}
这是它工作的类:
public class Playscreen extends WorldMap implements Screen {
public World world;
public SpriteBatch batch;
public float timeToSimulate;
private SEPGame game;
SpriteBatch sb;
public Tank tank;
public Target ziel;
private Tank gegner1;
boolean treffer;
public float width = Gdx.graphics.getWidth();
public float heights = Gdx.graphics.getHeight();
public WorldMap worldMap;
public Box2DDebugRenderer debugRenderer;
public Obstacle leftwall,upperwall,rightwall,lowerwall;
public Obstacle O1,O2,O3,O4;
public TextureAtlas atlas;
public MenuScreen menuScreen;
int anzahlTotePanzer = 0;
public Playscreen(SEPGame game)
{
world= new World(new Vector2(0,0), false);
ziel = new Target(MathUtils.random(Gdx.graphics.getWidth()-48),MathUtils.random(Gdx.graphics.getHeight()-48),world);
tank = new Tank(world,this, null,TankType.PLAYER_2);
gegner1 = new Tank(world, this, null,TankType.KI);
menuScreen = new MenuScreen(game);
atlas = new TextureAtlas("TanksGesamt.atlas");
leftwall=new Obstacle(world,1);
upperwall=new Obstacle(world,2);
rightwall=new Obstacle(world,3);
lowerwall=new Obstacle(world,4);
O1=new Obstacle(world, 200, 523, 30, 100, 90);
Texture t=new Texture(Gdx.files.internal("crateMetal.png"));
O2=new Obstacle(world, 400, 100, t);
O3=new Obstacle(world, 1200, 900, t);
worldMap = new WorldMap();
this.game = game;
debugRenderer = new Box2DDebugRenderer( true, true,
false, true, true, true );
world.setContactListener(new ContactListener()
{
@Override
public void beginContact(Contact contact)
{
}
@Override
public void endContact(Contact contact)
{
Fixture fixtureA = contact.getFixtureA();
Fixture fixtureB = contact.getFixtureB();
Body BodyA=contact.getFixtureA().getBody();
if(BodyA.equals(ziel.TargetBody))
{
treffer=true;
}
for (Flower flower : tank.flowers)
{
if(flower.FlowerBody.equals(contact.getFixtureB().getBody())
||flower.FlowerBody.equals(contact.getFixtureA().getBody()))
{
flower.todelete-=1;
}
}
}
@Override
public void preSolve(Contact contact, Manifold oldManifold)
{
}
@Override
public void postSolve(Contact contact, ContactImpulse impulse)
{
}
});
}
public void show() {
}
public void create() {
}
public void update(float fval) {
world.step(1 / 60f, 6, 2);
mapRenderer.setView(mainCamera);
}
public void openMenu(){
if(Gdx.input.isKeyJustPressed(Input.Keys.ESCAPE)){
game.setScreen(new MenuScreen(game));
this.dispose();
}
}
public void render(float delta) {
Gdx.gl.glClearColor(1, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
world.step(1 / 60f, 6, 2);
menuScreen.stage.dispose();
worldMap.render();
worldMap.mainCamera.update();
tank.render();
//tank.moveSprite();
tank.ControllerInput();
gegner1.render();
ziel.render();
tank.moveBody();
if(ziel!=null)
{
ziel.render();
}
if (tank.readytoshoot>0)
{
tank.readytoshoot-=1;
}
debugRenderer.render( world, worldMap.mainCamera.combined );
collision();
if (collision()) {
ziel = new Target(MathUtils.random(Gdx.graphics.getWidth()-48),
MathUtils.random(Gdx.graphics.getHeight()-48),world);
anzahlTotePanzer++;
System.out.println(anzahlTotePanzer);
}
if (treffer)
{
treffer=false;
ziel.delete();
ziel = new Target(MathUtils.random(Gdx.graphics.getWidth()-48),MathUtils.random(Gdx.graphics.getHeight()-48),world);
}
O2.render();
}
public boolean collision() {
boolean col = false;
Rectangle rectangle2 = ziel.bounds();
for(Flower f: tank.flowers) {
Rectangle rec1= f.getRec();
if(rec1.overlaps(rectangle2)){
col= true;
}else {
col= false;
}
}
return col;
}
这个类调用相同的坦克类，但给我一个 java.lang.UnsatisfiedLinkError: com.badlogic.gdx.physicals.box2d.PolygonShape.newPolygonShape()
public class SurvivalMode2 extends WorldMap implements Screen {
public EnemyTank enemyTank;
public SEPGame game;
public WorldMap worldMap;
public Tank tank;
public int anzahlPanzer;
public int spawnPanzer;
public ArrayList<EnemyTank> tankListe;
public Obstacle O1,O2,O3,O4;
public Obstacle leftwall,upperwall,rightwall,lowerwall;
public Box2DDebugRenderer debugRenderer;
boolean treffer;
public SurvivalMode2(SEPGame game) {
enemyTank = new EnemyTank(world, this,null ,TankType.KI);
tank = new Tank(world,null,this,TankType.PLAYER_1);
this.game = game;
world = new World(new Vector2(0,0), false);
worldMap = new WorldMap();
debugRenderer = new Box2DDebugRenderer
( true, true, false, true, true, true );
world.setContactListener(new ContactListener()
{
@Override
public void beginContact(Contact contact)
{
}
@Override
public void endContact(Contact contact)
{
Fixture fixtureA = contact.getFixtureA();
Fixture fixtureB = contact.getFixtureB();
Body BodyA=contact.getFixtureA().getBody();
if(BodyA.equals(enemyTank.enemyBody))
{
treffer=true;
}
for (Flower flower : tank.flowers)
{
if(flower.FlowerBody.equals(contact.getFixtureB().getBody())
||flower.FlowerBody.equals(contact.getFixtureA().getBody()))
{
flower.todelete-=1;
}
}
}
@Override
public void preSolve(Contact contact, Manifold oldManifold)
{
}
@Override
public void postSolve(Contact contact, ContactImpulse impulse)
{
}
});
}
public void update(){
mapRenderer.setView(mainCamera);
}
@Override
public void show() {
}
@Override
public void render(float delta) {
Gdx.gl.glClearColor(1, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
worldMap.render();
worldMap.mainCamera.update();
enemyTank.render();
tank.render();
}
我收到的错误:
Caused by: java.lang.UnsatisfiedLinkError: com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape()J
at com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape(Native Method)
at com.badlogic.gdx.physics.box2d.PolygonShape.<init>(PolygonShape.java:29)
at de.paluno.game.gameobjects.EnemyTank.<init>(EnemyTank.java:51)
at de.paluno.game.screens.SurvivalMode2.<init>(SurvivalMode2.java:54)
at de.paluno.game.screens.MenuScreen.survivalMode(MenuScreen.java:63)
at de.paluno.game.screens.MenuScreen$2.changed(MenuScreen.java:97)
at com.badlogic.gdx.scenes.scene2d.utils.ChangeListener.handle(ChangeListener.java:28)
at com.badlogic.gdx.scenes.scene2d.Actor.notify(Actor.java:183)
at com.badlogic.gdx.scenes.scene2d.Actor.fire(Actor.java:148)
at com.badlogic.gdx.scenes.scene2d.ui.Button.setChecked(Button.java:131)
at com.badlogic.gdx.scenes.scene2d.ui.Button$1.clicked(Button.java:94)
at com.badlogic.gdx.scenes.scene2d.utils.ClickListener.touchUp(ClickListener.java:88)
at com.badlogic.gdx.scenes.scene2d.InputListener.handle(InputListener.java:59)
at com.badlogic.gdx.scenes.scene2d.Stage.touchUp(Stage.java:350)
at com.badlogic.gdx.backends.lwjgl.LwjglInput.processEvents(LwjglInput.java:342)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:217)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126)
这是我来自 Enemytank 的代码，它与坦克相同，除了 moveBody 方法等几行或:
package de.paluno.game.gameobjects;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.physics.box2d.*;
import de.paluno.game.SEPGame;
import de.paluno.game.screens.Playscreen;
import de.paluno.game.screens.SurvivalMode2;
import java.util.ArrayList;
public class EnemyTank extends Sprite {
public ArrayList<EnemyTank> enemyList;
public Sprite enemySprite;
public SpriteBatch enemyBatch;
public PolygonShape shape;
public Texture texture;
private int currentLife;
private int maxLife;
private int fullLifeWidth;
public TankType type;
float PosX,PosY;
public Body enemyBody;
public BodyDef bdef;
public FixtureDef fdef;
public float Radius;
public EnemyTank(World world, SurvivalMode2 survivalScreen, Playscreen screen, TankType tankType){
enemyBatch = new SpriteBatch();
texture = new Texture("tankBody_huge.png");
enemySprite = new Sprite(texture);
PosX= MathUtils.random(Gdx.graphics.getWidth()-48);
PosY= MathUtils.random(Gdx.graphics.getHeight()-48);
bdef = new BodyDef();
fdef = new FixtureDef();
// TankBody erstellen
BodyDef bodyDef = new BodyDef();
bodyDef.type = BodyDef.BodyType.DynamicBody;
bodyDef.position.set(PosX, PosY);
PolygonShape shape = new PolygonShape();
shape.setAsBox(enemySprite.getWidth()/2-1, enemySprite.getHeight()/2-1);
Radius=(float)Math.sqrt((double)(enemySprite.getWidth()*
enemySprite.getWidth()/4+enemySprite.getHeight()*enemySprite.getHeight()/4) );
FixtureDef fixDef = new FixtureDef();
fixDef.shape = shape;
fixDef.density = 1f;
fixDef.restitution = .1f;
fixDef.friction = .5f;
enemyBody = world.createBody(bodyDef);
enemyBody.createFixture(fixDef);
enemyBody.setLinearDamping(2f);
enemyBody.setAngularDamping(2f);
enemyBody.setUserData(42);
this.type = tankType;
maxLife = 100;
currentLife = maxLife;
fullLifeWidth = 300;
}
public float getX() {
return enemySprite.getX();
}
public float getY() {
return enemySprite.getY();
}
public void render() {
enemyBatch.begin();
float x=enemyBody.getPosition().x-enemySprite.getWidth()/2;
float y=enemyBody.getPosition().y-enemySprite.getHeight()/2;
enemySprite.setPosition(x, y);
enemySprite.setRotation((float)(enemyBody.getAngle()/Math.PI*180f));
enemySprite.draw(enemyBatch);
enemyBatch.end();
}
public void setupBody() {
}
public Body getBody() {
return null;
}
public void setBodyToNullReference() {
}
public void update(float fval) {
}
}
最佳答案
java.lang.UnsatisfiedLinkError: com.badlogic.gdx.physicals.box2d.PolygonShape.newPolygonShape()J 表示 Java 尝试绑定(bind)标记为 native long newPolygonShape() 的 Java 方法code> 到底层非 java native 方法，但找不到它。
换句话说，com.badlogic.gdx.physicals.box2d Java 库和相应的 native 库之间不匹配。
我认为它适用于一个类而不适用于其他类的原因是您调用 PolygonShape 的不同方法，并且找到并绑定(bind)了一个方法，而其他方法则没有。
关于java - 如何修复 java.lang.UnsatisfiedLinkError : com. badlogic.gdx.physicals.box2d.PolygonShape.newPolygonShape()？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56265242/