游戏编程模式 - 状态模式

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using UnityEngine;using System.Collections;public enum LogicState{     STAND,    JUMP,    DUCK,    DIVE}public enum LogicInput{    PRESS_JUMP,    PRESS_DOWN,    RELEASE_DOWN}namespace finiteStateMachine{    public interface IState    {        IState handleInput(LogicEntity _logic, LogicInput _input);        void enter(LogicEntity _logic);        void update(LogicEntity _logic);        void exit(LogicEntity _logic);    }    public class DuckState : IState    {        private float chargeTime_ = 0f;        public IState handleInput(LogicEntity _logic, LogicInput _input)        {            if (LogicInput.RELEASE_DOWN == _input)            {                return LogicEntity.standState;            }            else            {                return null;            }        }        public void update(LogicEntity _logic, float gameFrameLength)        {            chargeTime_ += gameFrameLength;            if (chargeTime_ >= 5f)            {                //  dosomething                _logic.setState(LogicEntity.jumpState);            }        }        public void enter(LogicEntity _logic)        {            chargeTime_ = 0f;            _logic.setAnimation("animate_duck");        }        public void exit(LogicEntity _logic)        {        }    }    public class JumpState : IState    {        public IState handleInput(LogicEntity _logic, LogicInput _input)        {            if (LogicInput.PRESS_DOWN == _input)            {               return LogicEntity.diveState;            }            else            {                return null;            }        }        public void update(LogicEntity _logic, float gameFrameLength)        {            _logic.yVelocity -= gameFrameLength * LogicEntity.GRAVITY;            _logic.yPosition += _logic.yVelocity * gameFrameLength;            if (_logic.yPosition <= 0f)            {                _logic.yPosition = 0f;                _logic.setState(LogicEntity.standState);            }        }        public void enter(LogicEntity _logic)        {            _logic.setAnimation("animate_jump");        }        public void exit(LogicEntity _logic)        {        }    }    public class StandState : IState{        public IState handleInput(LogicEntity _logic, LogicInput _input){            if (LogicInput.PRESS_JUMP == _input){                return LogicEntity.jumpState;            }            else if(LogicInput.PRESS_DOWN == _input){                return ( new DuckState() );            }            else{                return null;            }        }        public void update(LogicEntity _logic, float gameFrameLength){        }        public void enter(LogicEntity _logic){            _logic.setAnimation("animate_stand");        }        public void exit(LogicEntity _logic){        }    }    public class DiveState : IState    {        public IState handleInput(LogicEntity _logic, LogicInput _input)        {            return null;        }        public void update(LogicEntity _logic, float gameFrameLength)        {            _logic.yVelocity -= gameFrameLength * LogicEntity.GRAVITY;            _logic.yPosition += _logic.yVelocity * gameFrameLength;            if (_logic.yPosition <= 0f)            {                _logic.yPosition = 0f;                _logic.setState(LogicEntity.standState);            }        }        public void enter(LogicEntity _logic)        {            _logic.setAnimation("animate_dive");        }        public void exit(LogicEntity _logic)        {        }    }    public class LogicEntity    {        public static readonly float GRAVITY = 10f;        public static readonly float JUMP_VELOCITY = 10f;        public static DiveState diveState = new DiveState();        public static JumpState jumpState = new JumpState();        public static StandState standState = new StandState();        public string animateName;        public float yVelocity;        public float yPosition;        IState state_;        public void handleInput(LogicInput inputKey)        {            IState _nextState = state_.handleInput(this, inputKey);            if (null != _nextState)            {                setState(_nextState);            }        }        public void update()        {            state_.update(this);        }        public void setState(IState _nextState)        {            state_.exit(this);            state_ = _nextState;            state_.enter(this);        }        public void setAnimation(string _animateName)        {            animateName = _animateName;        }    }}namespace test{    public class LogicEntity    {        public static readonly float JUMP_VELOCITY = 10f;        public float yVelocity;        public bool isDiving;        public bool isJumping;        public bool isDucking;        public void handleInput(LogicInput inputKey)        {            if (LogicInput.PRESS_JUMP == inputKey)            {                if (!isJumping && !isDucking && !isDiving)                {                    isJumping = true;                    yVelocity = JUMP_VELOCITY;                    setState(LogicState.JUMP);                }            }            else if (LogicInput.PRESS_DOWN == inputKey)            {                if (!isJumping && !isDiving)                {                    isDucking = true;                    setState(LogicState.DUCK);                }            }            else if (LogicInput.RELEASE_DOWN == inputKey)            {                if (isDucking && !isJumping && !isDiving)                {                    isDucking = false;                    setState(LogicState.STAND);                }                else if (isJumping && !isDucking)                {                    isDiving = true;                    setState(LogicState.DIVE);                }            }            else            {                Debug.LogError("not exist input:" + inputKey);            }        }        public void setState(LogicState curState)        {        }        public void nextState()        {        }    }    public class LogicEntity2    {        public static readonly float JUMP_VELOCITY = 10f;        public float yVelocity;        public LogicState state_;        public void handleInput(LogicInput inputKey)        {            switch (state_)            {                case LogicState.STAND:                    {                        if (LogicInput.PRESS_JUMP == inputKey)                        {                            yVelocity = JUMP_VELOCITY;                            setState(LogicState.JUMP);                        }                        else if (LogicInput.PRESS_DOWN == inputKey)                        {                            setState(LogicState.DUCK);                        }                        break;                    }                case LogicState.JUMP:                    {                        if (LogicInput.PRESS_DOWN == inputKey)                        {                            setState(LogicState.DIVE);                        }                        break;                    }                case LogicState.DUCK:                    {                        if (LogicInput.RELEASE_DOWN == inputKey)                        {                            setState(LogicState.STAND);                        }                        break;                    }                case LogicState.DIVE:                    {                        break;                    }                default:                    {                        Debug.LogError("not exist state:" + state_);                        break;                    }            }        }        private void setState(LogicState curState)        {        }    }}
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