我正在创建一个游戏，其中每个级别都有不同的Enemies，这些是圆形。对于Play方法init类中的第一个级别，我调用了一个将圆圈添加到ArrayList的类，并且我拥有它以便Player一次到达关卡的末尾，名为level的变量增加1，Player重生，ArrayList清除，并调用圆圈添加类，并使用更新的级别变量。
出于某种原因，在添加新圈子后，程序关闭。我尝试过这样，以便在init方法中我有if语句来确定level的值，但我找不到一种方法来多次调用init方法。我尝试过其他的东西，但似乎没什么用。这个添加圈子方法是我最后一次尝试，然后请求你们帮忙。
这是我的Play班级：
package tricky.game;
import java.util.*;
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
import org.newdawn.slick.geom.*;
public class Play extends BasicGameState{
public Shape border,bg,sZone,eZone;
public Player p;
public Options o;
public int level = 1;
public addCircles a;
public Play(int play){
}
@Override
public void init(GameContainer container, StateBasedGame sbg) throws SlickException {
sZone = new Rectangle(280,180,100,100);
eZone = new Rectangle(820,520,100,100);
border = new Rectangle(380,180,440,440);
bg= new Rectangle(0,0,1200,800);
a = new addCircles();
p = new Player();
p.init(container, sbg);
o = new Options();
a.setLevel(level);
a.setCircles();
}
@Override
public void render(GameContainer container, StateBasedGame sbg, Graphics g) throws SlickException {
Input input = container.getInput();
g.setColor(Color.white);
g.fill(bg);
g.setColor(Color.black);
g.drawString("X: "+input.getMouseX()+"\t Y: "+input.getMouseY(), 50, 50);
g.setColor(Color.lightGray);
g.fill(border);
g.fill(sZone);
g.fill(eZone);
g.setLineWidth(3f);
g.setColor(Color.black);
g.draw(border);
g.draw(sZone);
g.draw(eZone);
g.resetLineWidth();
g.setColor(Color.red);
g.drawString("START",302,225);
g.drawString("END",854,564);
p.render(container, sbg, g);
o.render(container, sbg, g);
g.drawString("Level:"+level,540,135);
g.drawString("ArrayList size:"+a.circle.size(),540,100);
for (int i = 0; i < a.circle.size(); i++) {
a.circle.get(i).render(container, sbg, g);
}
}
@Override
public void update(GameContainer container, StateBasedGame sbg, int delta) throws SlickException {
Input input = container.getInput();
p.update(container, sbg, delta);
o.update(container, sbg, delta);
for (int i = 0; i < a.circle.size(); i++) {
a.circle.get(i).update(container, sbg, delta);
if(p.getHB().intersects(a.circle.get(i).getCircle())){
p.respawn();
}
}
if(p.getHB().intersects(eZone)){
level++;
a.circle.clear();
p.respawn();
a.setLevel(level);
a.setCircles();
}
if(p.getHB().intersects(border) && !(p.getHB().intersects(sZone))){
p.setBorders(381,180,820,620);
}
if(p.getHB().intersects(sZone) && !(p.getHB().intersects(border))){
p.setBorders(280,180,820,280);
}
if(p.getHB().intersects(sZone) && (p.getHB().intersects(border))){
p.setBorders(380,180,820,280);
}
}
@Override
public int getID() {
return 2;
}
}
这是我的Enemies班级
package tricky.game;
import org.newdawn.slick.*;
import org.newdawn.slick.state.*;
import org.newdawn.slick.geom.*;
public class Enemies {
private float x,y,maxX,maxY,minX,minY;
public boolean dir=false;
private Shape circle;
public int type,radius;
public Enemies(int x,int y,int maxX,int minX,int maxY,int minY,int type,int radius,boolean dir){
this.x=x;
this.y=y;
this.maxX=maxX;
this.minX=minX;
this.maxY=maxY;
this.minY=minY;
this.type=type;
this.radius=radius;
this.dir=dir;
}
public void init(GameContainer container, StateBasedGame sbg) throws SlickException{
}
public void render(GameContainer container, StateBasedGame sbg, Graphics g) throws SlickException{
g.setColor(Color.cyan);
g.fill(circle);
g.setLineWidth(1.5f);
g.setColor(Color.black);
g.draw(circle);
g.resetLineWidth();
}
public void update(GameContainer container, StateBasedGame sbg, int delta) throws SlickException {
circle = new Circle(x, y, radius);
if(type==1){
if (!dir) {
x+=4;
}
if (x>=maxX) {
dir=true;
}
if (dir) {
x-=4;
}
if (x<=minX) {
dir=false;
}
}
if(type==2){
if (!dir) {
y+=4;
}
if (y>=maxY) {
dir=true;
}
if (dir) {
y-=4;
}
if (y<=minY) {
dir=false;
}
}
if(type==3){
if(!dir){
y+=4;
x+=4;
}
if(y>=maxY-20 && x>=maxX-20){
dir=true;
}
if(dir){
y-=4;
x-=4;
}
if(y<=minY+20 && x<=minX+20){
dir=false;
}
}
}
public Shape getCircle(){
return circle;
}
}
这是我的addCircles课程：
package tricky.game;
import java.util.*;
public class addCircles {
public ArrayList<Enemies> circle = new ArrayList();
public int level;
public void setLevel(int level){
this.level = level;
}
public void setCircles(){
if(level==1){
circle.add(new Enemies(420,220,780,420,0,0,1,20,false));
circle.add(new Enemies(780,580,780,420,0,0,1,20,true));
circle.add(new Enemies(600,260,0,0,540,260,2,20,false));
}
if(level==2){
circle.add(new Enemies(600,400,820,380,620,180,3,20,false));
}
}
}
编辑：我的意思是关闭它会给我以下错误：
Mon Jan 15 08:40:03 EST 2018 ERROR:null
java.lang.NullPointerException
at org.newdawn.slick.geom.ShapeRenderer.validFill(ShapeRenderer.java:94)
at org.newdawn.slick.geom.ShapeRenderer.fill(ShapeRenderer.java:107)
at org.newdawn.slick.Graphics.fill(Graphics.java:554)
at tricky.game.Enemies.render(Enemies.java:29)
at tricky.game.Play.render(Play.java:63)
at org.newdawn.slick.state.StateBasedGame.render(StateBasedGame.java:199)
at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:688)
at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
at tricky.game.TrickyGame.main(TrickyGame.java:32)
Mon Jan 15 08:40:03 EST 2018 ERROR:Game.render() failure - check the game code.
org.newdawn.slick.SlickException: Game.render() failure - check the game code.
at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:691)
at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
at tricky.game.TrickyGame.main(TrickyGame.java:32)
BUILD SUCCESSFUL (total time: 9 seconds)
编辑2：我已经发现将新敌人渲染到屏幕上的动作是打破程序的原因。我完成了第一级，添加了新的Enemies对象并且它可以工作，只是由于某种原因程序不想渲染它。
编辑3：我修复了一切。这是我渲染对象的方式。我正在使用g.draw()，现在我正在使用g.fillOval()
答案 0 :(得分：0)
我已经解决了我遇到的问题。出于某种原因，使用g.draw()函数进行渲染时，程序并不想渲染它。我现在正在使用g.drawOval() function，一切都很完美。