如何從java中的相同位置創建多個對象

Question

我正在嘗試製作塔防遊戲，並且遇到了麻煩，因此當我單擊底部的其中一個塔形按鈕並拖動到遊戲區域創建一個新的對象塔。我曾嘗試過使用數組列表，但每次拖動前一個塔消除新塔時，屏幕上都會出現新塔。

有幾個類，所以我只會發布我認爲是相關的。如果你需要別人，我可以把它們。很抱歉，我的帖子的長度。

這是處理事件的類 package addison;

import java.awt.Graphics; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import java.util.ArrayList; 

import javax.swing.JPanel; 
import javax.swing.Timer; 

@SuppressWarnings("serial") 
public class Controls extends JPanel implements MouseListener, MouseMotionListener,   ActionListener { 

    Timer timer; 

public static int x; //mouse's x pos 
public static int y; //mouse's y pos 
public static int iteration = 0; 

public static String button = ""; //identifies pressed button 

public static boolean pressed = false; //true if a button was pressed and not a random space 
public static boolean created = false; 

public static ArrayList<Tower> tower = new ArrayList<Tower>(); //arraylist of tower objects 

public Controls() { 

    timer = new Timer(5, this); //creates a 5ms timer 
    timer.start(); //starts timer 
    addMouseListener(this); 
    addMouseMotionListener(this); 
    setFocusable(true); 
} 

public void paintComponent(Graphics g) { 

    super.paintComponent(g); 

    Map.paint(g); //draws map 
    Hud.paint(g); //draws HUD 
    TextDisplay.paint(g); //displays text 
} 

public void actionPerformed(ActionEvent e) { 

    repaint(); //redraws graphics every 5ms 
} 

@Override 
public void mouseClicked(MouseEvent e) { 


} 

@Override 
public void mouseEntered(MouseEvent e) { 


} 

@Override 
public void mouseExited(MouseEvent e) { 


} 

@Override 
public void mousePressed(MouseEvent e) { 

    if (Hud.getButton()) { 

     pressed = true; 
    } else { 

     pressed = false; 
    } 

    System.out.println(pressed); 
} 

@Override 
public void mouseReleased(MouseEvent e) { 

    x = e.getX(); //gets mouse's x pos 
    y = e.getY(); //gets mouse's y pos 

    if (pressed) { // if the button pressed was gun man 

     tower.add(iteration, new Tower(TextDisplay.description, x, y, 100, 100, 25)); //add a new tower object to the end of the arraylist 

     System.out.println(tower.get(0).x); 

     created = true; 
     pressed = false; 
    } 

    iteration++; 
} 

@Override 
public void mouseDragged(MouseEvent e) { 


} 

@Override 
public void mouseMoved(MouseEvent e) { 

    x = e.getX(); //get mouse's x pos 
    y = e.getY(); //get mouse;s y pos 

    if (Hud.getButton()) { 

     TextDisplay.hovering = true; 
    } else { 

     TextDisplay.hovering = false; 
    } 
} 
} 

package addison; 

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Rectangle; 

這一切是繪製 公共類地圖{

public static Rectangle mouse; //location of cursor 

public Map() { 

} 

public static void paint(Graphics g) { 

    g.setColor(new Color(255, 0, 0)); //makes mouse hit box transparent 
    mouse = new Rectangle(Controls.x, Controls.y, 5, 5); //create mouse hit box 
    g.fillRect(mouse.x, mouse.y, mouse.width, mouse.height); //draw mouse hit box 


    g.drawRect(0, 0, 800, 450); //play area 

    g.drawRect(0, 0, 800, 500); //options area 

    if (Controls.created) { 

     g.fillRect(Controls.tower.get(Controls.iteration).x, Controls.tower.get(0).y, 50, 50); 
    } 
} 
} 

這就是按鈕的類的類： 包艾迪生;

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Rectangle; 

public class Hud { 

public static Rectangle gunman; 
public static Rectangle laserTower; 
public static Rectangle rocketLauncher; 
public static Rectangle emBomb; 
public static Rectangle soundGun; 

public Hud() { 

} 

public static void paint(Graphics g) { 

    gunman = new Rectangle(0, 450, 50, 50); //create gun man button 
    g.fillRect(gunman.x, gunman.y, gunman.width, gunman.height); //draw gun man button 

    g.setColor(Color.BLUE); 
    laserTower = new Rectangle(50, 450, 50, 50); //create laser tower button 
    g.fillRect(laserTower.x, laserTower.y, laserTower.width, laserTower.height); //draw laser tower button 

    g.setColor(Color.CYAN); 
    rocketLauncher = new Rectangle(100, 450, 50, 50); //create rocket launcher tower 
    g.fillRect(rocketLauncher.x, rocketLauncher.y, rocketLauncher.width, rocketLauncher.height); //draw rocket launcher button 

    g.setColor(Color.DARK_GRAY); 
    emBomb = new Rectangle(150, 450, 50, 50); //creates em bomb button 
    g.fillRect(emBomb.x, emBomb.y, emBomb.width, emBomb.height); //draw em bomb button 

    g.setColor(Color.GREEN); 
    soundGun = new Rectangle(200, 450, 50, 50); //create sound gun button 
    g.fillRect(soundGun.x, soundGun.y, soundGun.width, soundGun.height); //draw sound gun button 
} 

public static boolean getButton() { 

    if(Map.mouse.intersects(Hud.gunman)) { 

     TextDisplay.description = "Gunman"; 
     return true; 
    } else if (Map.mouse.intersects(Hud.laserTower)) { 

     TextDisplay.description = "Laser Tower"; 
     return true; 
    } else if (Map.mouse.intersects(Hud.rocketLauncher)) { 

     TextDisplay.description = "Rocket Launcher"; 
     return true; 
    } else if (Map.mouse.intersects(Hud.emBomb)) { 

     TextDisplay.description = "E.M. Bomb"; 
     return true; 
    } else if (Map.mouse.intersects(Hud.soundGun)) { 

     TextDisplay.description = "Sound Gun"; 
     return true; 
    } else { 

     TextDisplay.description = ""; 
     return false; 
    } 
} 
} 

這是使Tower對象的類： package addison;

public class Tower { 

public static String type = ""; //type of tower e.g. gunman or laser tower 
public static int x = 0; 
public static int y = 0; 
public static int range = 0; //tower range 
public static int speed = 0; //tower speed 
public static int sRange = 0; //tower's shrapnel range 

public Tower(String a, int b, int c, int d, int e, int f) { 

    type = a; 
    x = b; 
    y = c; 
    range = d; 
    speed = e; 
    sRange = f; 
} 
} 

謝謝。

Answer 1

，因爲你只畫塔在最後一次迭代中以下行：

g.fillRect(Controls.tower.get(Controls.iteration).x, Controls.tower.get(0).y, 50, 50); 

你需要油漆全部塔在禁區功能

Answer 2

好像你正在使用Control.iteration作爲鍵入你的塔列表。但是，每調用一次mouseReleased（是否創建塔），您都會增加iteration。這意味着您的繪圖處理程序中的Controls.iteration鍵永遠不會引用新創建的塔。你也使用Controls.tower.get(0).y - 爲什麼這與x座標不同？

我希望我已經正確地理解了這一點。如果您只是繪製新創建的塔，爲什麼不在控件中保留一個引用？如果您將它們全部繪製，則應循環從0到iteration - 1，並在if (pressed)區塊內移動iteration++。