在处理过程中使游戏“掉落块”的问题

问题描述

所以我在Processing上做游戏，我似乎无法找到如何使if语句成为条件。当我的圈子碰到一个障碍时，这种情况应该会减少生命。我有这个主意，但我只是不能将其放入代码中，请帮助我。条件为“ if”，其后为完整游戏代码。

void difficulty()
      {
        if(/*what do i write here*/){
        lives--;    
      }
      else{
       fill(0,255,0); 
      }
      }     

////////主要游戏代码从此处开始////////

int score;
    int score1;
    int miss;
    int lives=10;
    int ballx,bally;
     
    class Rect
    {
      float x;
      float y;
      float speed;
      float leng;
      color c;
      boolean valid;
     
      final int MAX_COLOR = 255;
      final int MIN_X = 50,MAX_X = 750;
      final int MIN_Y = -800,MAX_Y = -100;
      int MIN_SPEED = 1,MAX_SPEED = 2;
      final int MIN_Leng = 50,MAX_Leng =100 ;
     
      Rect()
      {
        initAll();
      }
     
      void initAll() {
        valid = true;
        c     = color(random(255),random(255),random(255));
        x     = random(MIN_X,MAX_X); 
        y     = random(MIN_Y,MAX_Y);
        speed = random(MIN_SPEED,MAX_SPEED);
        leng  = random(MIN_Leng,MAX_Leng);
      }
     
     
      void update() {
        if (!valid) {
          initAll();
          return;
        }
        move();
        draw_rect();
      }
      void draw_rect()
      {
        fill(c);
        rect (x,y,leng,leng);
      }
     
     
      void move()
      {
        if (y-leng <= height)
        {
          y += speed;
        } else if (y-leng > height )
        {
          valid = false;
          miss++;
        }
      }
     
      void difficulty()
      {
        if(){
        lives--;    
      }
      else{
       fill(0,0); 
      }
      }
      void GameOver()
      {
        if (lives==0)
        {
          for (int i = 0; i < Obj.length; i++)
          {
            Obj[i] = new Rect();
          }
     
          background(0);
          textSize(50 );
          fill(255);
          text( "You Lose ",15,150);
          text( "score: " + score,100);
        }
      }
     
     
      boolean isOver(int mx,int my) {
        float disX = x - mx;
        float disY = y - my;
        if (sqrt(sq(disX) + sq(disY)) < leng/2 ) {
          return true;
        } else {
          return false;
        }
      }
    }
     
     
    Rect [] Obj = new Rect [10];
     
     
    void setup() {
      size (400,600);
      ballx=200;
      bally=300;
      for (int i = 0; i < Obj.length; i++)
      {
        Obj[i] = new Rect();
      }
    }
     
     
    void draw() {
      
      background(0);
      textSize(50);
      text( "score: " + score,100);
      text("Lives: " + lives,50);
      ellipse(ballx,bally,20,20);
     
      for (int i = 0; i < Obj.length; i++) {
        Obj[i].update();
        Obj[i].difficulty();
        Obj[i].GameOver();
      }
      surface.setTitle(nf(frameRate,3,2));
    }
    
    
    
    void keypressed(){
      
      for(Rect s : Obj){
        if ( key =='q' ){
         ballx=ballx-2;
         score++;
         score1++;
        s.valid = false;
         break;
        }
        if ( key =='e'){
         ballx=ballx+2;
         score++;
         score1++;
         s.valid = false;
         break;
        }
      }
          
    }

解决方法

您要做的是检查播放器是否与任何矩形发生碰撞。

考虑一下，玩家与矩形碰撞意味着什么？

这意味着播放器的x位置必须大于左侧的x位置，但小于矩形右侧的x位置。 y位置也是如此。

由于需要检查所有所有矩形的位置，因此应使用for或foreach循环。

您现在可以按照我之前说的做，它可以正常工作，但是您还应该考虑播放器本身的大小。如果玩家的矩形的左侧/右侧（而不是矩形）与矩形发生碰撞，则玩家仍应与矩形发生碰撞。 从技术上讲，播放器是一个圆形，但为简化起见，我们将其近似为矩形。

boolean isColliding = false;
for(Rect r : Obj)
{
  if (ballx + 10 > r.x &&          //is the right side of the ball further right than the left side of the rectangle?
  ballx - 10 < r.x + r.leng &&     //is the left side of the ball further left than the right side of the rectangle?
                                   //if both of the above are true,the balls x-position is between the left and right side of the ball
  
  bally + 10 > r.y &&              //is the bottom of the ball further down than the top of the rectangle?
  bally - 10 < r.y + r.leng) {     //is the top of the ball further up than the bottom of the rectangle?
    isColliding = true;            //if all of the above are true,the ball is colliding with the rectangle
  }
} 
if (isColliding) {
  lives--;
} else {
  fill(0,255,0);
}