GameMaker平台游戏敌人垂直碰撞失效及逻辑颠倒问题求助

• 水平碰撞功能正常，但垂直碰撞完全失效
• 调试消息逻辑颠倒：碰撞墙体时显示“colliding with the floor”，碰撞地面时显示“colliding with the wall”
• 敌人触碰墙体未停止移动，反而穿墙而过
• 已排查碰撞掩码、变量、代码顺序、对象名称，未解决问题

敌人Create事件AI代码 #

//BIGGER SPRITE
image_xscale = 3
image_yscale = 3

//VARIABLES
hsp=0
vsp=0
grav=2

state=noone 
state_time = room_speed * 10;
state_timer=0;

destination_x = x;
vel=2
//STANDING STATE

//WALKING STATE

//METHOD OF CHANGE OF STATE
change_state = function(_state)
{
    state_time--;
    state_timer = irandom(state_time);
    
    if (state_timer == state_time or state_time <= 0)
    {
        //I'LL CHECK WHICH STATE SHOULD I GO
        state = _state[irandom(array_length(_state)-1)];
        
        time_state = room_speed * 10;
    }
}


//METHOD OF IT STANDING
standing_state = function()
{
    //image_blend = c_white;
    
    sprite_index = spr_enemy
    
    change_state([walking_state, standing_state]);
}

walking_state = function()
{
    //MAKE HIM WALK
    //HE WILL CHOOSE ANY POINT WITHIN THE ROOM
    //CHECKING MY DISTANCE FROM THE DESTINATION
    var _dist = point_distance(x, y, destination_x, y);
    //I WILL ONLY SET A DESTINATION IF I AM CLOSE TO MY DESTINATION
    if (_dist < 100)
    {
        destination_x = random(room_width);
    }
    
    //FINDING THE DIRECTION TO MY DESTINATION
    var _dir = point_direction(x, y, destination_x, y)
    
    //MOVING TO MY DESTINATION
    x += lengthdir_x(vel, _dir);
    
    //image_blend = c_red;
    
    //SETTING THE SPRITE
    sprite_index = spr_enemy_run
    if (destination_x < x)
    {
        image_xscale = -3
    }
    else
    {
        image_xscale = 3
    }
    
    change_state([standing_state, walking_state]);
}

//SETTING ITS INITIAL STATE
state = standing_state;

敌人Step事件碰撞与重力代码 #

//HORIZONTAL COLLISION
if place_meeting(x + hsp, y, obj_block)
{
    var _hsp = sign(hsp);
    //AS LONG AS I'M NOT COLLIDING 1 PIXEL IN THE DIRECTION I'M
    while (!place_meeting(x + _hsp, y, obj_block))
    {
        //I MOVE 1 PIXEL IN THAT DIRECTION
        x+=_hsp;
    }
    //I'VE MOVED WHAT I HAD TO MOVE, AND NOW I'M COLLIDING.
    //I END MY SPEED
    hsp = 0;
    show_debug_message("colliding with the floor")
}
//I MOVE
x += hsp;

//VERTICAL COLLISION
if place_meeting(x, y + vsp, obj_block)
{
    var _vsp = sign(vsp);
    while (!place_meeting(x, y + _vsp, obj_block))
    {
        y+=_vsp;
    }
    vsp = 0;
    show_debug_message("colliding with the wall")
}
y += vsp;

//GRAVITY
if !place_meeting(x,y,obj_block)
{
    vsp += grav;
}


//RUNNING THE CURRENT STATE
state();

问题修复方案 #

1. 修正调试消息文本颠倒 #

• 水平碰撞代码中的show_debug_message("colliding with the floor")改为show_debug_message("colliding with the wall")
• 垂直碰撞代码中的show_debug_message("colliding with the wall")改为show_debug_message("colliding with the floor")

2. 解决垂直碰撞失效与穿墙问题 #

• 修复移动逻辑冲突：walking_state中直接修改x坐标会跳过碰撞检测，需改为更新hsp变量让碰撞代码处理移动：

  // 替换原来的x += lengthdir_x(vel, _dir);
  hsp = lengthdir_x(vel, _dir);
  

• 调整重力代码顺序：将重力代码移到垂直碰撞检测之前，确保vsp被重力更新后再检测碰撞：

  //GRAVITY
  if !place_meeting(x,y+1,obj_block)
  {
      vsp += grav;
  }
  
  //VERTICAL COLLISION
  if place_meeting(x, y + vsp, obj_block)
  {
      var _vsp = sign(vsp);
      while (!place_meeting(x, y + _vsp, obj_block))
      {
          y+=_vsp;
      }
      vsp = 0;
      show_debug_message("colliding with the floor")
  }
  y += vsp;
  
  //HORIZONTAL COLLISION
  if place_meeting(x + hsp, y, obj_block)
  {
      var _hsp = sign(hsp);
      while (!place_meeting(x + _hsp, y, obj_block))
      {
          x+=_hsp;
      }
      hsp = 0;
      show_debug_message("colliding with the wall")
  }
  x += hsp;
  
  //RUNNING THE CURRENT STATE
  state();
  

3. 修复状态切换函数变量错误 #

change_state中使用了未定义的time_state变量，改为state_time：

change_state = function(_state)
{
    state_time--;
    state_timer = irandom(state_time);
    
    if (state_timer == state_time or state_time <= 0)
    {
        state = _state[irandom(array_length(_state)-1)];
        state_time = room_speed * 10;
    }
}

内容的提问来源于stack exchange，提问作者Ynowihet