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实现简单的吃豆人运行效果:

//114通过上下左右键控制吃豆人的移动
class DrawBeans{
  int x;
  int y;
  int sz, flag;
  int forward;
  DrawBeans(int x, int y, int sz){
    this.x = x;
    this.y = y;
    this.sz = sz;
    flag = 0;
    forward = 0;
  }
  void draw_right(){
    forward = 0;
    draw_bean(radians(30), radians(330));
    draw_eye();
  }
  void draw_left(){
    forward = 2;
    draw_bean(radians(210), radians(510));
    draw_eye();
  }
  void draw_up(){
    forward = 3;
    draw_bean(radians(300), radians(600));
    draw_eye();  
  }
  void draw_down(){
    forward = 1;
    draw_bean(radians(120), radians(420));
    draw_eye();
  }
  void draw_ellipse(){
    fill(255, 255, 0);
    ellipse(x, y, sz, sz);
    draw_eye();
  }
  void draw_eye(){
    fill(0);
    if(forward == 0){
      ellipse(x+sz/4-4, y-sz/4, 5, 5);
    }else if(forward == 1){
      ellipse(x+sz/4, y+sz/4 -4, 5, 5);
    }else if(forward == 2){
      ellipse(x-sz/4+4, y-sz/4, 5, 5);
    }else if(forward == 3){
      ellipse(x-sz/4, y-sz/4+4, 5, 5);
    }
    noFill();
    fill(255, 255, 0);
  }
  void draw_bean(float start, float stop){
    arc(x, y, sz, sz, start, stop);
    fill(255, 255, 0);
  }

  void move_right(){
    if(x+sz/2 == width){
      x = width-sz/2;
      draw_right();
    }else
    {
      if(flag < 10){
        draw_right();
        flag+=1;
      }else if(flag>=10 && flag <15){
        draw_ellipse();
        flag+=1;
      }else if(flag == 15){
        flag = 0;
      }
      x += 1;
      }
  }
  void move_left(){
    if(x-sz/2 == 0){
      x = sz/2;
      draw_left();
    }else
    {
      if(flag < 10){
        draw_left();
        flag+=1;
      }else if(flag>=10 && flag <15){
        draw_ellipse();
        flag+=1;
      }else if(flag == 15){
        flag = 0;
      }
      x -= 1;
      }
  }
  void move_up(){
    if(y == sz/2){
      y = sz/2;
      draw_up();
    }else
    {
      if(flag < 10){
        draw_up();
        flag+=1;
      }else if(flag>=10 && flag <15){
        draw_ellipse();
        flag+=1;
      }else if(flag == 15){
        flag = 0;
      }
      y-= 1;
      }
  }
  void move_down(){
    if(y+sz/2 == height){
      y = height-sz/2;
      draw_down();
    }else
    {
      if(flag < 10){
        draw_down();
        flag+=1;
      }else if(flag>=10 && flag <15){
        draw_ellipse();
        flag+=1;
      }else if(flag == 15){
        flag = 0;
      }
      y += 1;
      }
  }
  void draw_default(){
    if(forward == 0)
      move_right();
    else if(forward == 1)
      move_down();
    else if(forward == 2)
      move_left();
    else if(forward == 3)
      move_up();
  }
};
DrawBeans db;
void setup(){
  db = new DrawBeans(100, 100, 40);
  size(640, 480);
  noStroke();
  smooth();
  frameRate(120);
}
void draw(){
  background(120);
  if(keyPressed && key == CODED){
    if(keyCode == RIGHT){
      db.move_right();
    }else if(keyCode == DOWN){
      db.move_down();
    }else if(keyCode == LEFT){
      db.move_left();
    }else if(keyCode == UP){
      db.move_up();
    }
  }
  else{
    db.draw_default();
  }
}

程序运行结果:

函数使用说明:

通过前面的简单代码就可以实现吃豆人的移动，类成员函数和成员变量还需要进行修改优化