正在停止圖像移動

Question

好吧，所以當我點擊鼠標時，我的圖片就會沿着y軸向下移動，我唯一的問題是我不知道如何讓它停止點擊屏幕底部，有人可以幫忙嗎？

import java.awt.Point; 
import org.newdawn.slick.GameContainer; 
import org.newdawn.slick.Graphics; 
import org.newdawn.slick.SlickException; 
import org.newdawn.slick.state.BasicGameState; 
import org.newdawn.slick.state.StateBasedGame; 

public class Control extends BasicGameState { 
    public static final int ID = 1; 

    public Methods m = new Methods(); 
    public Point[] point = new Point[(800 * 600)]; 

    int pressedX; 
    int pressedY; 
    int num = 0; 
    String Build = "1.1"; 

    public void init(GameContainer container, StateBasedGame game) throws SlickException{ 
    } 

    public void render(GameContainer container, StateBasedGame game, Graphics g) throws SlickException { 
     for (Point p : point) { 
      if (p != null) { 
       m.drawParticle(p.x, p.y += 1); 
      } 
     } 
     g.drawString("Particle Test", 680, 0); 
     g.drawString("Build: " + Build, 680, 15); 
     g.drawString("Pixels: " + num, 10, 25); 
    } 

    public void update(GameContainer container, StateBasedGame game, int delta) { 
    } 

    public void mousePressed(int button, int x, int y) { 
     pressedX = x; 
     pressedY = y; 
     num = num + 1; 
     point[num] = new Point(pressedX, pressedY); 
     } 

    public int getID() { 
     return ID; 
    } 

} 

Answer 1

我想象的地方，你會想看看顆粒的X/Y POS您呈示它時，它的出界從數組中刪除它之前...

public void render(GameContainer container, StateBasedGame game, Graphics g) throws SlickException { 
    for (int index = 0; index < point.length; index++) { 
     Point p = point[index]; 
     if (p != null) { 
      p.y++; 
      if (p.y > height) { // You'll need to define height... 
       point[index] = null; // Or do something else with it?? 
      } else { 
       m.drawParticle(p.x, p.y); 
      } 
     } 
    } 
    g.drawString("Particle Test", 680, 0); 
    g.drawString("Build: " + Build, 680, 15); 
    g.drawString("Pixels: " + num, 10, 25); 
} 

你也可以做一個搶先檢查，這將讓你知道什麼點在屏幕的底部...

 if (p != null) { 
      if (p.y >= height) { // You'll need to define height... 
       // Do something here 
      } else { 
       p.y++; 
       m.drawParticle(p.x, p.y); 
      } 
     }