碰撞检测然后让玩家停止

Question

我正在使用处理，我想创建一个游戏，玩家在房间里，如果他们撞到墙，他们就会像普通墙一样停止移动。然而，我真的不知道该怎么做。用我目前的方法，一旦它们撞到墙上，它们就不能再在x轴上移动了。如有任何帮助，我们将不胜感激。

PVector playerPosition;
PVector barrierPosition;
float velocity = 4;
boolean goLeft=false;
boolean goRight=false;
boolean goUp=false;
boolean goDown=false;
float playerWidth = 10;
float playerHeight = 10;
float barrierWidth = 10;
float barrierHeight = 600;

void setup() {
  size(800,600);
  rectMode(CORNER);
  playerPosition = new PVector(200,200);
  barrierPosition = new PVector(0,0);
}
void draw() {
 background(255); 
 drawPlayer();
 movePlayerPosition();
 drawBarrier();
 checkCollide();

}
  //check for collision with barrier then stop player moving
  void checkCollide() {
   if (playerPosition.y <= barrierHeight + playerHeight && playerPosition.x <= barrierWidth + playerWidth)
   {
     println("COLLIDED");
     playerPosition.x = barrierPosition.x + 10;
   }
  }
void drawPlayer() {
  fill(255,0,0);
  rect(playerPosition.x,playerPosition.y,playerWidth,playerHeight);  
}
void drawBarrier() {
  fill(0);
  rect(barrierPosition.x,barrierPosition.y,barrierWidth,barrierHeight);  
}
void movePlayerPosition() {
    //moves up and down
    if (goUp && playerPosition.y > 0)
    {
      playerPosition.y = playerPosition.y - velocity;
    } else if (goDown && playerPosition.y < 598-playerHeight)
    {
      playerPosition.y = playerPosition.y + velocity;
    }
    //moves right and left
    if (goLeft && playerPosition.x > 0)
    {
      playerPosition.x = playerPosition.x -velocity;
    } else if (goRight && playerPosition.x <800-playerWidth)
    {
      playerPosition.x = playerPosition.x + velocity;
    }
  }
  //if the keys are pressed move in that direction
void keyPressed() {
  if (key == 'w') {
    goUp=true;
  } else if (key == 'a') {
    goLeft=true;
  } else if (key == 's') {
    goDown=true;
  } else if (key == 'd') {
    goRight=true;
  }
}
//if the keys are released stop moving
void keyReleased() {
  if (key == 'w') {
    goUp=false;
  } else if (key == 'a') {
    goLeft=false;
  } else if (key == 's') {
    goDown=false;
  } else if (key == 'd') {
    goRight=false;
  }
}

Answer 1

先简单回答；您的checkForCollide方法应该返回布尔值，而不是void，然后您可以将此方法与movePlayerPosition方法一起使用，并且仅在没有碰撞的情况下执行X轴移动。

现在，在一个更完整的答案中；你应该多研究一下这个主题，有很多模式和库可以更好、更容易地处理这个主题。我向你推荐代码的本质，你可以免费获得这个pdf，你有很多关于第5章及以后物理库的使用，还有很多关于游戏编程的示例。

希望这能有所帮助，祝你好运。问候Jose

Answer 2

你离得太近了！

此行之后：

println("COLLIDED");

你这样设置新的坐标：

playerPosition.x = barrierPosition.x + 10;

这意味着发生第一次碰撞后，x位置将始终设置为barrierPosition.x + 10;

你可能想做的是将播放器移动10个像素，但相对于它现在的位置：

playerPosition.x = playerPosition.x + 10;

或：

playerPosition.x += 10;

玩得开心！

作为参考，您修改了几个字符的完整代码：

PVector playerPosition;
PVector barrierPosition;
float velocity = 4;
boolean goLeft=false;
boolean goRight=false;
boolean goUp=false;
boolean goDown=false;
float playerWidth = 10;
float playerHeight = 10;
float barrierWidth = 10;
float barrierHeight = 600;

void setup() {
  size(800,600);
  rectMode(CORNER);
  playerPosition = new PVector(200,200);
  barrierPosition = new PVector(0,0);
}
void draw() {
 background(255); 
 drawPlayer();
 movePlayerPosition();
 drawBarrier();
 checkCollide();

}
  //check for collision with barrier then stop player moving
  void checkCollide() {
   if (playerPosition.y <= barrierHeight + playerHeight && playerPosition.x <= barrierWidth + playerWidth)
   {
     println("COLLIDED");
     playerPosition.x += 10;
   }
  }
void drawPlayer() {
  fill(255,0,0);
  rect(playerPosition.x,playerPosition.y,playerWidth,playerHeight);  
}
void drawBarrier() {
  fill(0);
  rect(barrierPosition.x,barrierPosition.y,barrierWidth,barrierHeight);  
}
void movePlayerPosition() {
    //moves up and down
    if (goUp && playerPosition.y > 0)
    {
      playerPosition.y = playerPosition.y - velocity;
    } else if (goDown && playerPosition.y < 598-playerHeight)
    {
      playerPosition.y = playerPosition.y + velocity;
    }
    //moves right and left
    if (goLeft && playerPosition.x > 0)
    {
      playerPosition.x = playerPosition.x -velocity;
    } else if (goRight && playerPosition.x <800-playerWidth)
    {
      playerPosition.x = playerPosition.x + velocity;
    }
  }
  //if the keys are pressed move in that direction
void keyPressed() {
  if (key == 'w') {
    goUp=true;
  } else if (key == 'a') {
    goLeft=true;
  } else if (key == 's') {
    goDown=true;
  } else if (key == 'd') {
    goRight=true;
  }
}
//if the keys are released stop moving
void keyReleased() {
  if (key == 'w') {
    goUp=false;
  } else if (key == 'a') {
    goLeft=false;
  } else if (key == 's') {
    goDown=false;
  } else if (key == 'd') {
    goRight=false;
  }
}