java - 如何指定我的对象的宽度和高度JAVA

Question

所以我试图为我正在创建的一个小游戏添加碰撞检测，并且我正在指定防御者类的宽度和高度，但我无法这样做。下面的代码给出了一个错误，指出全局变量宽度和高度不存在

class Defender
{
  int x,y;

  Defender(int x, int y)
  {
   this.x = x;
   this.y = y;
  }

  void render()
  {
    //draw a defender
 fill(255,0,0);
 rect(x,y,50,20);
 triangle(x+50,y,x+50,y+20,x+60,y+10);
 fill(0,0,100);
 rect(x,y-10,20,10);
  }


  boolean collision()
  {
   color detectedColour;
   for (int i=y; i<y+ Defender.height; i++) {
     detectedColour = get(x + Defender.width, i);
     if (detectedColour == Alien1) {
       return true;
     }
  }
  return false;
  }
}

Answer 1

问题是当类中不存在变量时，您试图静态访问变量。创建代表防守者宽度和高度的类成员。

class Defender {

    private final int x;

    private final int y;

    private final int width;

    private final int height;

    public Defender(int x, int y, int width, int height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
    }

    // getters
}

Defender defender = new Defender(0, 0, 1, 1);

int width = defender.width;

int height = defender.height;