java - 完成了我的 Frog 游戏，但碰撞系统的精度出现了问题

Question

所以我正在创建一个 Frog 游戏，我已经得到了一切，但我遇到了一个小问题，我的碰撞系统非常不一致，我一直在试图找出是什么，但我不太明白它是什么。我希望它在碰到矩形时立即停止。任何帮助都会得到帮助。

import java.awt.event.KeyEvent;
import java.awt.geom.Rectangle2D;
public class frogger
{
   static double frogX = .5;
   static double frogY = .02;
   static double frogW = .02;
   static double frogH = .02;
   static double halfWidth = .05;
   static double halfHeight = .02;

   static double speeds[] = {.02, .03, .035 , .040, .043, .046, .060, .070};

   static Rectangle2D.Double[] rectangles = {new Rectangle2D.Double(.45 , .12 , .1 , .04), new Rectangle2D.Double(.45 , .27 , .1 , .04), new Rectangle2D.Double(.45 , .42 , .1 , .04),
   new Rectangle2D.Double(.45 , .57 , .1 , .04), new Rectangle2D.Double(.45 , .72 , .1 , .04), new Rectangle2D.Double(.45 , .87 , .1 , .04), new Rectangle2D.Double(.45 , .92 , .1 , .04)};

   public static void drawscene()
   {
      StdDraw.clear();
      StdDraw.setPenColor(StdDraw.GREEN);
      StdDraw.filledRectangle(frogX, frogY, frogW, frogH);      
      StdDraw.setPenColor(StdDraw.RED);
      for(int i = 0; i < rectangles.length; i++)
      {
      StdDraw.filledRectangle(rectangles[i].x + halfWidth, rectangles[i].y - halfHeight, halfWidth, halfHeight);
      }
      StdDraw.show(1000/24);  
   }



   public static void updateDirection() 
   {

     for(int i = 0; i < rectangles.length; i++){
         rectangles[i].x += speeds[i];
     }

     for(int i = 0; i < rectangles.length; i++){
         if(rectangles[i].x + halfWidth >= .98 || rectangles[i].x + halfWidth <= .02){
             speeds[i] *= -1;
         }
     }



      if (StdDraw.isKeyPressed(KeyEvent.VK_UP))
      {
          frogY += .01;
      }
      else if(StdDraw.isKeyPressed(KeyEvent.VK_DOWN))
      {
         frogY -= .01;
      }
      else if(StdDraw.isKeyPressed(KeyEvent.VK_LEFT))
      {
          frogX -= .01;
      }
      else if(StdDraw.isKeyPressed(KeyEvent.VK_RIGHT))
      {
          frogX += .01;
      }

   }

   public static void main(String[] args)  
   {
      outerloop: 
      while(true)
      {
         frogger.drawscene();
         frogger.updateDirection();
         if (frogX  >= 1 )
         { 
            break;
         }
         if (frogX  <= 0)
         {

            break;
         }   
         if(frogY >= 1)
         {
            break;
         }

         Rectangle2D.Double frog = new Rectangle2D.Double(frogX - frogW, frogY + frogH, frogW * 2, frogH * 2);

         for(int i = 0; i < rectangles.length; i++){
             if(frog.intersects(rectangles[i])){
                 break outerloop;
             }
         }

      }

      // put whatever you want to display at the end of the game here


   }
}

Answer 1

所以，我几乎肯定这与 Java 中 double 和 float 的不准确有关:

Why not use double or float to represent currency?

我从未使用过您在这里使用的库。当您需要更高精度时，推荐的解决方案通常是使用 BigDecimal 类。但是，我不能说我确定您将如何使用这个库来做到这一点。