（爪哇）如何让charachter在接触墙壁时上下移动[关闭]

Question

public void Collisions(){

        boolean truthCheck = false;
        //If this object doesnt hit anything then there was no collision so its initially false
        GameObject tempPlayer = object.get(0);
        //Just a really bad way for me to get the player 
        for (int i = 0;i < object.size();i++){
            GameObject tempObject = object.get(i);
            //This cycles through all of my objects and if the ID is solid then it'll run the check on it 
            if(tempObject.subid == SubID.Solid){
                if (tempPlayer.getX() + tempPlayer.getWidth() +  tempPlayer.getVelX() - 4>= tempObject.getX() && tempPlayer.getX() + 4 + tempPlayer.getVelX() <= tempObject.getX() + tempObject.getWidth() && tempPlayer.getY() + tempPlayer.getHeight() + tempPlayer.getVelY() - 4>= tempObject.getY() && tempPlayer.getY() + tempPlayer.getVelY() + 4 <= tempObject.getY() + tempObject.getHeight()) {
                    //This bit is a rectangle collision detector^
                    {
                        truthCheck = true;
                        //It collided!
                        break;
                    }
                }
            }

        }
        tempPlayer.setCollides(truthCheck);
    }

Answer 1

据我所知，问题在于何时调用collections。

主要应该在播放器上、下、左、右移动时有类似的内容

class Player
{
    ...
    //could return just void
    public boolean moveRight()
    {
      this.right = this.right+1;
      //check collisions for player new coordonates
      //need just for a specific player
      //assume this method calculate all collisions and set up properly each player
      new Collision().Collisions();
      if(this.collision) 
      {
        //true
        //revert to old coords.
        //screen will not be updated (collison)
        this.right = this.right-1;
        return false;
      }
      //false - move allowed
      update_Player_Move_On_Screen();
      return true;
      
    }
    ...
}

相反，如果发生冲突，可能会改变玩家坐标并更改回来，方法collaction应该允许类似的内容。

public boolean Collisions(Player P) { ... } 

boolean move_allowed = new Collision().Collisions(new Player(new_coords));
//just see if new coord will be allowed 
//if true, then change player coords and update screen