[英]Java | Slick2D | Entity system / game object system collisions
Few days ago I started to work on a 'simple' 2D game. 几天前,我开始研究“简单”的2D游戏。 I tried to do it with 'entity system'.
我试图用“实体系统”来做。 I got class 'GameObject' which extends all other objects like trees, enemies (slimes) and so on.
我得到了“ GameObject”类,该类扩展了所有其他对象,例如树木,敌人(史莱姆)等。 All of these game objects are stored in a arrayList called 'gameObjects'.
所有这些游戏对象都存储在一个名为“ gameObjects”的arrayList中。 Then I'm using a for loop to iterate through all objects from a list and calling their basic functions like update() and draw().
然后,我使用一个for循环遍历列表中的所有对象,并调用它们的基本功能,如update()和draw()。 Until now everything works even though I'm not 100% sure why.
到现在为止,即使我不确定100%为何,一切仍然可行。 The problem is that for some reason I can't do the same with collisions.
问题是由于某种原因,我无法对碰撞进行相同的处理。
I know this topic was discussed many times here but even though after a many days I can't solve this. 我知道这个话题在这里已经讨论了很多次,但是即使过了几天我还是无法解决。 Can someone help me please?
有人能帮助我吗? Also, I apologize for my English.
另外,我对我的英语表示歉意。
Game class: 游戏类别:
public class Game extends BasicGame
{
public Game()
{
super("Game");
}
public void init(GameContainer gameContainer) throws SlickException
{
World.init();
}
public void update(GameContainer gameContainer, int delta) throws SlickException
{
World.update();
}
public void render(GameContainer gameContainer, Graphics g) throws SlickException
{
World.draw(g);
}
}
GameObject class: GameObject类:
public abstract class GameObject
{
protected void update()
{
}
protected void draw()
{
}
}
Tree class: 树类:
public class Tree extends GameObject
{
public float x, y;
private static Image tree;
public Tree(float x, float y)
{
this.x = x;
this.y = y;
tree = Resources.miscSheet.getSprite(2, 0);
}
public void draw()
{
tree.draw(x, y)
}
}
Slime class: 粘液类:
public class Slime extends GameObject
{
public static float x;
public static float y;
private static Animation slimeAnim;
public Slime(int x, int y)
{
this.x = x;
this.y = y;
// My own method for loading animation.
slimeAnim = Sprite.getAnimation(Resources.slimeSheet, 0, 0, 5, 300);
}
public void update()
{
// *Random movement here*
}
public void draw()
{
slimeAnim.draw(x, y);
}
}
World class: 世界级:
public class World
{
public static List<GameObject> gameObjects = new ArrayList<GameObject>();
public static void init()
{
Tree tree = new Tree(0, 0);
Tree tree2 = new Tree(200, 200);
Slime slime = new Slime(80, 80);
gameObjects.add(tree);
gameObjects.add(tree2);
gameObjects.add(slime);
}
public static void update()
{
for (int i = 0; i < gameObjects.size(); i++)
{
GameObject o = gameObjects.get(i);
o.update();
}
}
public static void draw(Graphics g)
{
g.setBackground(new Color(91, 219, 87));
for (int i = 0; i < gameObjects.size(); i++)
{
GameObject o = gameObjects.get(i);
o.draw();
}
}
}
Main class: 主班:
public class Main
{
public static AppGameContainer container;
public static void main(String[] args) throws SlickException
{
container = new AppGameContainer(new Game());
container.setDisplayMode(1024, 600, false);
container.setShowFPS(false);
container.start();
}
}
I deleted all my previous collision attempts and I skipped some other unnecessary things. 我删除了以前的所有碰撞尝试,并跳过了一些其他不必要的事情。 How can I now please implement collisions for example between trees and slimes?
我现在如何才能实现树木和粘液之间的碰撞?
What I usually do is inheriting from Rectangle on my top objectClass. 我通常要做的是从顶级对象类的Rectangle继承。 If your GameObject class inherits from Rectangle you'll have
intersects
method in every instance which gives you a way to easily detect collision. 如果您的GameObject类是从Rectangle继承的,则每个实例中都将具有
intersects
方法,这为您提供了一种轻松检测碰撞的方法。
class GameObject extends Rectangle{}
The problem will be to do the test between all your objects. 问题将是在所有对象之间进行测试。 It will be quite heavy but still possible.
这将是很沉重的,但仍然可能。
for (int i = 0; i < gameObjects.size(); i++) {
for (int j = i; j < gameObjects.size(); j++) {
if (gameObjects.get(i-1).intersects(gameObjects.get(j)) {
// I don't know what you want to do here
}
}
}
This way you compare object A to object B only once. 这样,您只将对象A与对象B比较一次。
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