java - Java 矩形衝突検出の混乱

Question

Bucky の洗練された Java チュートリアルを使用して、単純な 2D 状態変更ゲームを作成しました。このゲームを修正し、マップ上で衝突を設定して、プレイヤーがマップ上の家を通り抜けられないようにしたいと考えています。衝突がどのように機能するかについて、私は一種の考えを持っていると思います：

次のコードを使用して 2 つの長方形を作成します。

public Rectangle getBounds() {
 return new Rectangle(x, y, width, height);

}

プレイヤーに1つ、障害物に1つ、これをコードにどのように配置し、Javaに障害物の長方形がプレーヤーの長方形と異なることをどのように伝えますか?

次に、2 つの長方形を作成した後、if ステートメントを設定して、if intersects のようなことを行います...

うまくいけば、この後はうまくいくと思います。ゲームに関する追加情報です。これは状態変更ゲームであり、いくつかのメソッド、init、render、update などのメソッドがあります (update メソッドの四角形と if ステートメントはどこに配置しますか?) また、俯瞰ゲームです。それが助けになるなら、ポケモンのようなもの。私のコードが必要な場合は、お尋ねください。

編集1:

package javagame;

import org.newdawn.slick.*;
import org.newdawn.slick.state.*;

public class Play extends BasicGameState{

    Animation bucky, movingUp, movingDown, movingLeft, movingRight, movingBL, movingBR, movingFL, movingFR;
    Image worldMap;
    boolean quit = false;//gives user to quit the game
    int[] duration = {200, 200};//how long frame stays up for
    float buckyPositionX = 0;
    float buckyPositionY = 0;
    float shiftX = buckyPositionX + 320;//keeps user in the middle of the screem
    float shiftY = buckyPositionY + 160;//the numbers are half of the screen size

    public Play(int state){
    }   
    public void init(GameContainer gc, StateBasedGame sbg) throws SlickException{
          worldMap = new Image("res/world.png");
          Image[] walkUp = {new Image("res/b.png"), new Image("res/b.png")}; //these are the images to be used in the "walkUp" animation
          Image[] walkDown = {new Image("res/f.png"), new Image("res/f.png")};
          Image[] walkLeft = {new Image("res/l.png"), new Image("res/l.png")};
          Image[] walkRight = {new Image("res/r.png"), new Image("res/r.png")};
          Image[] walkBL = {new Image("res/bl.png"), new Image("res/bl.png")};
          Image[] walkBR = {new Image("res/br.png"), new Image("res/br.png")};
          Image[] walkFL = {new Image("res/fl.png"), new Image("res/fl.png")};
          Image[] walkFR = {new Image("res/fr.png"), new Image("res/fr.png")};

    movingUp = new Animation(walkUp, duration, false);
    movingDown = new Animation(walkDown, duration, false);  
    movingLeft = new Animation(walkLeft, duration, false);  
    movingRight = new Animation(walkRight, duration, false);
    movingBL = new Animation(walkBL, duration, false);
    movingBR = new Animation(walkBR, duration, false);
    movingFL = new Animation(walkFL, duration, false);
    movingFR = new Animation(walkFR, duration, false);
    bucky = movingDown;//facing screen initially on startup
    }


    public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException{
    worldMap.draw(buckyPositionX, buckyPositionY);//position 0,0
    bucky.draw(shiftX, shiftY);//makes him appear at center of map
    g.drawString("Suraj's X: "+buckyPositionX+"\nSuraj's Y: "+buckyPositionY,400,20);//tells us the position

    if(quit==true){
        g.drawString("Resume(R)", 250, 100);
        g.drawString("Main(M)", 250, 150);
        g.drawString("Quit Game(Q)", 250, 200);
        if(quit==false){
            g.clear();//wipe off everything from screen
        }
    }
    }

    public void update(GameContainer gc, StateBasedGame sbg, int delta)throws SlickException{
    Input input = gc.getInput();
    //up
    if(input.isKeyDown(Input.KEY_UP)){
        bucky = movingUp;//changes the image to his back
        buckyPositionY += 10;;//increase the Y coordinates of bucky (move him up)
        if(buckyPositionY>162){//if I reach the top 
            buckyPositionY -= 10;//stops any further movement in that direction
        }
    }

    //down
    if(input.isKeyDown(Input.KEY_DOWN)){
        bucky = movingDown;
        buckyPositionY -= 10;
        if(buckyPositionY<-600){
            buckyPositionY += 10;//basically change the direction if + make -
    }}
    //left
    if(input.isKeyDown(Input.KEY_LEFT)){
        bucky = movingLeft;
        buckyPositionX += 10;
        if(buckyPositionX>324){
            buckyPositionX -= 10;//delta * .1f
    }}
    //right
    if(input.isKeyDown(Input.KEY_RIGHT)){
        bucky = movingRight;
        buckyPositionX -= 10;
        if(buckyPositionX<-840){
            buckyPositionX += 10;
    }}




    //2 key combos start here
    if(input.isKeyDown(Input.KEY_RIGHT) && input.isKeyDown(Input.KEY_UP)){
        bucky = movingBR;
        buckyPositionX -= delta * .1f;
        if(buckyPositionX<-840){
            buckyPositionX += delta * .1f;
            if(buckyPositionY>162){
                buckyPositionY -= delta * .1f;
            }}}
    if(input.isKeyDown(Input.KEY_LEFT) && input.isKeyDown(Input.KEY_UP)){
        bucky = movingBL;
        buckyPositionX -= delta * .1f;
        if(buckyPositionX>324){
            buckyPositionX -= delta * .1f;
            if(buckyPositionY>162){
                buckyPositionY -= delta * .1f;
            }}}
    if(input.isKeyDown(Input.KEY_RIGHT) && input.isKeyDown(Input.KEY_DOWN)){
        bucky = movingFR;
        buckyPositionX -= delta * .1f;
        if(buckyPositionY<-600){
            buckyPositionY += delta * .1f;
            if(buckyPositionX<-840){
                buckyPositionX += delta * .1f;
            }}}
    if(input.isKeyDown(Input.KEY_LEFT) && input.isKeyDown(Input.KEY_DOWN)){
        bucky = movingFL;
        buckyPositionX -= delta * .1f;
        if(buckyPositionY<-600){
            buckyPositionY += delta * .1f;
            if(buckyPositionX>324){
                buckyPositionX -= delta * .1f;
            }}}

     //escape
    if(input.isKeyDown(Input.KEY_ESCAPE)){
        quit=true;
    }
    //when the menu is up
    if(quit==true){//is the menu on the screen
        if(input.isKeyDown(Input.KEY_R)){
            quit = false;//resumes the game, makes menu dissapear
        }
        if(input.isKeyDown(Input.KEY_M)){
            sbg.enterState(0);//takes you to the main menu
        }
        if(input.isKeyDown(Input.KEY_Q)){
            System.exit(0);//quits the game
        }
    }

}

    public int getID(){
        return 1;
    }
}

これは私の Play クラスです。私が持っている他の 2 つのクラスはメインとメニューだけです。メインクラスまたはメニュークラスで四角形のメソッドが作成されているとは想像できません。残っているのは Play だけですが、作成方法がわかりません。これまでに行ったコードの 2 つの異なる Rectangles (1 つはプレーヤー用、もう 1 つは家用)。私のメインクラスとメニュークラスが必要な場合は、教えてください。

編集3：

私はあなたが言ったことを試し、Rectanglebase クラスを作成し、そこに投稿した if ステートメントを入れましたが、エラーが発生しています。私のプレーヤークラスで getX と getY のメソッドを作成するように求めています。コンストラクタにもエラーがあります：

public Rectanglebase{}//the public is saying syntax error

あなたが言ったように Home と Player クラスも作成しましたが、何を入れる必要があるのか少し混乱しているため、 Home クラスの下に置きました。

return Rectangle(100,100,100,100);

エラーが発生しています。これが正しいかどうかはわかりません。また、x、y 位置のプレーヤークラスでは、プレーヤーの Play クラスから float 変数をどのように設定すればよいでしょうか。

score 7 · Accepted Answer

以下は、メソッドによるゲームループ/ゲームロジックと衝突検出の例です。Rectangle2D#intersects(..)

JPanelすべてを描画するために使用Rectangle2Dされ、クラス (すべてが描画される JPanel にEntity描画する必要があるオブジェクト) に使用されます。GamePanel

updateGame()メソッドは、衝突チェックを見つける場所です。

    private void updateGame() {

        if (entities.get(0).intersects(entities.get(1))) {
            System.out.println("Intersecting");
        }
         ....
    }

あなたはPlayer 1WでA、、、、Sで移動しDます。プレーヤー 2と交差すると、 aprintln()が交差を確認します。

ここに画像の説明を入力

ゲームロジック.java:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.swing.AbstractAction;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;

/**
 *
 * @author David Kroukamp
 */
public class GameLogic {

    public GameLogic() {
        initComponents();
    }
    final GamePanel gp = new GamePanel(500, 500);

    private void initComponents() {

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Entity entity1 = new Entity(100, 100, 100, 100, createWhiteImage());
        Entity entity2 = new Entity(300, 200, 100, 100, createBlackImage());

        gp.addEntity(entity1);
        gp.addEntity(entity2);//just a standing still JPanel

        setGamePanelKeyBindings(gp, entity1);

        frame.add(gp);

        frame.pack();
        frame.setVisible(true);

        //start the game loop which will repaint the screen
        runGameLoop();
    }
    //Starts a new thread and runs the game loop in it.

    public void runGameLoop() {
        Thread loop = new Thread(new Runnable() {
            @Override
            public void run() {
                gp.running.set(true);
                gp.gameLoop();
            }
        });
        loop.start();
    }

    private void setGamePanelKeyBindings(GamePanel gp, final Entity entity) {
        gp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("D"), "D pressed");
        gp.getActionMap().put("D pressed", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                entity.RIGHT = true;
            }
        });

        gp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("A"), "A pressed");
        gp.getActionMap().put("A pressed", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                entity.LEFT = true;
            }
        });

        gp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("W"), "W pressed");
        gp.getActionMap().put("W pressed", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                entity.UP = true;
            }
        });

        gp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("S"), "S pressed");
        gp.getActionMap().put("S pressed", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                entity.DOWN = true;
            }
        });
        gp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("released D"), "D released");
        gp.getActionMap().put("D released", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                entity.RIGHT = false;
            }
        });

        gp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("released A"), "A released");
        gp.getActionMap().put("A released", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                entity.LEFT = false;
            }
        });

        gp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("released W"), "W released");
        gp.getActionMap().put("W released", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                entity.UP = false;
            }
        });

        gp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("released S"), "S released");
        gp.getActionMap().put("S released", new AbstractAction() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                entity.DOWN = false;
            }
        });
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new GameLogic();
            }
        });
    }

    private BufferedImage createWhiteImage() {
        BufferedImage img = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = img.createGraphics();
        g2.setColor(Color.WHITE);
        g2.fillRect(0, 0, img.getWidth(), img.getHeight());
        return img;
    }

    private BufferedImage createBlackImage() {
        BufferedImage img = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = img.createGraphics();
        g2.setColor(Color.BLACK);
        g2.fillRect(0, 0, img.getWidth(), img.getHeight());
        return img;
    }
}

class Entity extends Rectangle2D.Double {

    private int speed = 5;
    public boolean UP = false,
            DOWN = false,
            LEFT = false,
            RIGHT = false;
    private final BufferedImage image;

    public Entity(int x, int y, int width, int height, BufferedImage image) {
        super(x, y, width, height);
        this.width = width;
        this.height = height;
        this.image = image;
    }

    public BufferedImage getImage() {
        return image;
    }

    public void move() {
        if (UP) {
            y -= speed;
        }
        if (DOWN) {
            y += speed;
        }
        if (LEFT) {
            x -= speed;
        }
        if (RIGHT) {
            x += speed;
        }

    }
}

class GamePanel extends JPanel {

    private int width, height;
    private int frameCount = 0;
    private int fps = 0;
    public static AtomicBoolean running = new AtomicBoolean(false), paused = new AtomicBoolean(false);
    final ArrayList<Entity> entities = new ArrayList<>();

    GamePanel(int w, int h) {
        super(true);
        setIgnoreRepaint(true);//mustnt repaint itself the gameloop will do that
        setLayout(null);
        width = w;
        height = h;
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(width, height);
    }

    public void addEntity(Entity e) {
        entities.add(e);
    }

    //Only run this in another Thread!
    public void gameLoop() {
        //This value would probably be stored elsewhere.
        final double GAME_HERTZ = 30.0;
        //Calculate how many ns each frame should take for our target game hertz.
        final double TIME_BETWEEN_UPDATES = 1000000000 / GAME_HERTZ;
        //At the very most we will update the game this many times before a new render.
        //If you're worried about visual hitches more than perfect timing, set this to 1.
        final int MAX_UPDATES_BEFORE_RENDER = 5;
        //We will need the last update time.
        double lastUpdateTime = System.nanoTime();
        //Store the last time we rendered.
        double lastRenderTime = System.nanoTime();

        //If we are able to get as high as this FPS, don't render again.
        final double TARGET_FPS = 60;
        final double TARGET_TIME_BETWEEN_RENDERS = 1000000000 / TARGET_FPS;

        //Simple way of finding FPS.
        int lastSecondTime = (int) (lastUpdateTime / 1000000000);

        while (running.get()) {
            double now = System.nanoTime();
            int updateCount = 0;

            if (!paused.get()) {
                //Do as many game updates as we need to, potentially playing catchup.
                while (now - lastUpdateTime > TIME_BETWEEN_UPDATES && updateCount < MAX_UPDATES_BEFORE_RENDER) {
                    updateGame();
                    lastUpdateTime += TIME_BETWEEN_UPDATES;
                    updateCount++;
                }

                //If for some reason an update takes forever, we don't want to do an insane number of catchups.
                //If you were doing some sort of game that needed to keep EXACT time, you would get rid of this.
                if (now - lastUpdateTime > TIME_BETWEEN_UPDATES) {
                    lastUpdateTime = now - TIME_BETWEEN_UPDATES;
                }

                drawGame();
                lastRenderTime = now;

                //Update the frames we got.
                int thisSecond = (int) (lastUpdateTime / 1000000000);

                if (thisSecond > lastSecondTime) {
                    System.out.println("NEW SECOND " + thisSecond + " " + frameCount);
                    fps = frameCount;
                    frameCount = 0;
                    lastSecondTime = thisSecond;
                }

                //Yield until it has been at least the target time between renders. This saves the CPU from hogging.
                while (now - lastRenderTime < TARGET_TIME_BETWEEN_RENDERS && now - lastUpdateTime < TIME_BETWEEN_UPDATES) {
                    //allow the threading system to play threads that are waiting to run.
                    Thread.yield();

                    //This stops the app from consuming all your CPU. It makes this slightly less accurate, but is worth it.
                    //You can remove this line and it will still work (better), your CPU just climbs on certain OSes.
                    //FYI on some OS's this can cause pretty bad stuttering. Scroll down and have a look at different peoples' solutions to this.
                    //On my OS it does not unpuase the game if i take this away
                    try {
                        Thread.sleep(1);
                    } catch (Exception e) {
                    }

                    now = System.nanoTime();
                }
            }
        }
    }

    private void drawGame() {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                repaint();
            }
        });
    }

    private void updateGame() {

        if (entities.get(0).intersects(entities.get(1))) {
            System.out.println("Intersecting");
        }

        for (Entity e : entities) {
            e.move();
        }
    }

    @Override
    protected void paintComponent(Graphics grphcs) {
        super.paintComponent(grphcs);
        Graphics2D g2d = (Graphics2D) grphcs;

        applyRenderHints(g2d);

        g2d.setColor(Color.GREEN);
        g2d.fillRect(0, 0, getWidth(), getHeight());

        for (Entity e : entities) {
            g2d.drawImage(e.getImage(), (int) e.getX(), (int) e.getY(), null);
        }

        g2d.setColor(Color.BLACK);
        g2d.drawString("FPS: " + fps, 5, 10);

        frameCount++;
    }
    private final static RenderingHints textRenderHints = new RenderingHints(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    private final static RenderingHints imageRenderHints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    private final static RenderingHints colorRenderHints = new RenderingHints(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
    private final static RenderingHints interpolationRenderHints = new RenderingHints(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
    private final static RenderingHints renderHints = new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

    public static void applyRenderHints(Graphics2D g2d) {
        g2d.setRenderingHints(textRenderHints);
        g2d.setRenderingHints(imageRenderHints);
        g2d.setRenderingHints(colorRenderHints);
        g2d.setRenderingHints(interpolationRenderHints);
        g2d.setRenderingHints(renderHints);
    }
}

score 0 · Accepted Answer

if(house.getBounds().contains(player.getX(),player.getY()){//do something}

あなたの家とあなたのプレイヤーの長方形が異なるクラスで定義されている限り、Javaは違いを知ることができます

長方形を処理するための基本クラスであるクラスを最初に作成します。

public class Rectanglebase{

public void getBounds(){//write method}

//write other methods you will need to use for both rectangles here

public Rectanglebase{//default constructor}

}//end class definition

今家とプレーヤーのためのクラスを書きます：

public class House extends Rectanglebase{
//getBounds() is inherited, so just write stuff to do with the graphics of the house here
}

メインコードで家を生成するとき、あなたはあなた自身のものを作ることができます：

House house = new House();

次に、同様の方法でプレーヤーのクラスを生成し、メインコードで構成します。

Player player = new Player()

houseとplayerは異なる変数です、これはJavaがあなたの家とプレーヤーの違いを伝える方法です

java - Java 矩形衝突検出の混乱

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