dota2rpg自定义按键绑定及WASD移动的实现

本文的目的是在DOTA2自定义游戏中实现一个WASD控制的8方向移动，如果你想实现的是4方向的，稍微修改一点点代码也可以做到。
通过本文，你也可以了解到DOTA2自定义按键的流程。
本文的所有代码你都可以在我开源的Endless Dungeon项目中找到

一、声明按键绑定

按键绑定需要写在 game/dota_addons/你的项目文件夹/addon_info.txt中（完整代码）

    "Default_Keys"
    {
        "01"
        {
            "Key"       "D"
            "Command"   "+PlayerMoveRight"
            "Name"      "PlayerMoveRight"
        }
        "02"
        {
            "Key"       "W"
            "Command"   "+PlayerMoveUp"
            "Name"      "PlayerMoveUp"
        }
        "03"
        {
            "Key"       "S"
            "Command"   "+PlayerMoveDown"
            "Name"      "PlayerMoveDown"
        }
        "04"
        {
            "Key"       "A"
            "Command"   "+PlayerMoveLeft"
            "Name"      "PlayerMoveLeft"
        }
}

就完成了按键的声明。

命令的回调声明则是在content/dota_addons/你的项目名称/panorama/scripts/custom_game/key_binding.js文件中（完整代码）
其中，要注意的是+代表按键按下，-代表按键抬起。

function WrapFunction(name) {
    return function() {
        Game[name]();
    };
}

(function() {
    Game.AddCommand( "+PlayerMoveUp", WrapFunction("PlayerMoveUp"), "", 0 );
    Game.AddCommand( "+PlayerMoveDown", WrapFunction("PlayerMoveDown"), "", 0 );
    Game.AddCommand( "+PlayerMoveLeft", WrapFunction("PlayerMoveLeft"), "", 0 );
    Game.AddCommand( "+PlayerMoveRight", WrapFunction("PlayerMoveRight"), "", 0 );
    Game.AddCommand( "-PlayerMoveUp", WrapFunction("PlayerMoveUp_End"), "", 0 );
    Game.AddCommand( "-PlayerMoveDown", WrapFunction("PlayerMoveDown_End"), "", 0 );
    Game.AddCommand( "-PlayerMoveLeft", WrapFunction("PlayerMoveLeft_End"), "", 0 );
    Game.AddCommand( "-PlayerMoveRight", WrapFunction("PlayerMoveRight_End"), "", 0 );
)();

这里需要注意的问题是，这个js文件，你最好一次性写完之后，只在custom_ui_menifest.xml里面引用他，这也是为什么需要用WrapFunction方法来把回调放在其他的文件中，这样如果你如果修改回调方法并保存js文件后，引擎重新运行js文件就不会运行到Game.AddCommand，否则，命令绑定就会失效导致按键就会无响应（这是一个已知的BUG，很影响debug的效率）。

二、js的命令回调

在任意被引用的js文件中写明命令的回调如下：

Game.PlayerMoveUp = function() {
    GameEvents.SendCustomGameEventToServer("ed_player_start_move_up", {})
};
Game.PlayerMoveDown = function() {
    GameEvents.SendCustomGameEventToServer("ed_player_start_move_down", {})
};
Game.PlayerMoveLeft = function() {
    GameEvents.SendCustomGameEventToServer("ed_player_start_move_left", {})
};
Game.PlayerMoveRight = function() {
    GameEvents.SendCustomGameEventToServer("ed_player_start_move_right", {})
};

Game.PlayerMoveUp_End = function() {
    GameEvents.SendCustomGameEventToServer("ed_player_end_move_up", {})
};
Game.PlayerMoveDown_End = function() {
    GameEvents.SendCustomGameEventToServer("ed_player_end_move_down", {})
};
Game.PlayerMoveLeft_End = function() {
    GameEvents.SendCustomGameEventToServer("ed_player_end_move_left", {})
};
Game.PlayerMoveRight_End = function() {
    GameEvents.SendCustomGameEventToServer("ed_player_end_move_right", {})
};

三、服务器端的事件响应

服务器在收到ed_player_start_move_up之类的事件之后，做出具体的响应，代码如下，具体说明见注释

function CEDGameMode:_RegisterCustomGameEventListeners()
    -- 注册移动的事件响应，上下左右的开始和结束（按下即开始，松开即结束）
    CustomGameEventManager:RegisterListener("ed_player_start_move_up", function(_, keys)
        self:On_ed_player_start_move_up(keys)
    end)
    CustomGameEventManager:RegisterListener("ed_player_start_move_down", function(_, keys)
        self:On_ed_player_start_move_down(keys)
    end)
    CustomGameEventManager:RegisterListener("ed_player_start_move_left", function(_, keys)
        self:On_ed_player_start_move_left(keys)
    end)
    CustomGameEventManager:RegisterListener("ed_player_start_move_right", function(_, keys)
        self:On_ed_player_start_move_right(keys)
    end)
    CustomGameEventManager:RegisterListener("ed_player_end_move_up", function(_, keys)
        self:On_ed_player_end_move_up(keys)
    end)
    CustomGameEventManager:RegisterListener("ed_player_end_move_down", function(_, keys)
        self:On_ed_player_end_move_down(keys)
    end)
    CustomGameEventManager:RegisterListener("ed_player_end_move_left", function(_, keys)
        self:On_ed_player_end_move_left(keys)
    end)
    CustomGameEventManager:RegisterListener("ed_player_end_move_right", function(_, keys)
        self:On_ed_player_end_move_right(keys)
    end)
end

-- 上下左右四个方向
local upVector    = Vector(0, 1, 0)
local downVector  = Vector(0, - 1, 0)
local leftVector  = Vector(- 1, 0, 0)
local rightVector = Vector(1, 0, 0)

-- 核心的控制上下左右移动的循环
local function createMovingTimer(hero)
    if hero.m_MovingTimer then
        return
    end
    
    -- 创建按键计时器，Timer函数需要https://github.com/XavierCHN/EndlessDungeon/blob/master/game/ed/scripts/vscripts/utils/funcs.lua
    -- 中的Timer函数    
    hero.m_MovingTimer = Timer(function()
        if not (IsValidEntity(hero) and hero:IsAlive()) then
            hero.bMovingUp    = false
            hero.bMovingDown  = false
            hero.bMovingLeft  = false
            hero.bMovingRight = false
            return 0.03
        end

        local movingVector = Vector(0, 0, 0)

        -- 根据玩家英雄当前上下左右的状态，计算玩家当前应该移动的方向
        -- 如按下A则应当向左移动
        -- 同时按AD应当不移动
        -- 同时按WD应当向右上方移动
        if hero.bMovingUp then
            movingVector = movingVector + upVector
        end
        if hero.bMovingDown then
            movingVector = movingVector + downVector
        end
        if hero.bMovingLeft then
            movingVector = movingVector + leftVector
        end
        if hero.bMovingRight then
            movingVector = movingVector + rightVector
        end
        movingVector = movingVector:Normalized()

        -- 具体的移动
        if movingVector.x == 0 and movingVector.y == 0 then
            -- 如果x, y均等于0，则不移动
        else
            -- 开始移动
            if not hero:IsStunned() then
                -- 直接设定面向，这样快速交替按AD才会有响应
                hero:SetForwardVector(movingVector)
                -- 往移动的方向移动一小步
                ExecuteOrderFromTable({
                                          UnitIndex = hero:entindex(),
                                          OrderType = DOTA_UNIT_ORDER_MOVE_TO_POSITION,
                                          Position  = hero:GetOrigin() + movingVector * 32
                                      })
            else
                hero:Stop()
            end
        end
        return 0.03
    end)
end

-- 开始向上移动的按键响应，其他方向的与此类似
function CEDGameMode:On_ed_player_start_move_up(keys)
    local player = PlayerResource:GetPlayer(keys.PlayerID)
    if not player then
        return
    end
    local hero = player:GetAssignedHero()
    if not hero then
        return
    end

    if not (IsValidEntity(hero) and hero:IsAlive()) then
        hero.bMovingUp = false
        ShowError("ed_hud_error_cannot_move", keys.PlayerID)
        return
    end

    if not hero.m_MovingTimer then
        createMovingTimer(hero)
    end

    -- 置向上移动为true
    hero.bMovingUp = true
end
function CEDGameMode:On_ed_player_start_move_down(keys)
    local player = PlayerResource:GetPlayer(keys.PlayerID)
    if not player then
        return
    end
    local hero = player:GetAssignedHero()
    if not hero then
        return
    end

    if not (IsValidEntity(hero) and hero:IsAlive()) then
        hero.bMovingDown = false
        ShowError("ed_hud_error_cannot_move", keys.PlayerID)
        return
    end

    if not hero.m_MovingTimer then
        createMovingTimer(hero)
    end

    hero.bMovingDown = true
end
function CEDGameMode:On_ed_player_start_move_left(keys)
    local player = PlayerResource:GetPlayer(keys.PlayerID)
    if not player then
        return
    end
    local hero = player:GetAssignedHero()
    if not hero then
        return
    end

    if not (IsValidEntity(hero) and hero:IsAlive()) then
        hero.bMovingLeft = false
        ShowError("ed_hud_error_cannot_move", keys.PlayerID)
        return
    end

    if not hero.m_MovingTimer then
        createMovingTimer(hero)
    end

    hero.bMovingLeft = true
end
function CEDGameMode:On_ed_player_start_move_right(keys)
    local player = PlayerResource:GetPlayer(keys.PlayerID)
    if not player then
        return
    end
    local hero = player:GetAssignedHero()
    if not hero then
        return
    end

    if not (IsValidEntity(hero) and hero:IsAlive()) then
        hero.bMovingRight = false
        ShowError("ed_hud_error_cannot_move", keys.PlayerID)
        return
    end

    if not hero.m_MovingTimer then
        createMovingTimer(hero)
    end

    hero.bMovingRight = true
end
function CEDGameMode:On_ed_player_end_move_up(keys)
    local player = PlayerResource:GetPlayer(keys.PlayerID)
    if not player then
        return
    end
    local hero = player:GetAssignedHero()
    if not hero then
        return
    end

    if not (IsValidEntity(hero) and hero:IsAlive()) then
        hero.bMovingUp = false
        ShowError("ed_hud_error_cannot_move", keys.PlayerID)
        return
    end

    if not hero.m_MovingTimer then
        createMovingTimer(hero)
    end

    hero.bMovingUp = false
end
function CEDGameMode:On_ed_player_end_move_down(keys)
    local player = PlayerResource:GetPlayer(keys.PlayerID)
    if not player then
        return
    end
    local hero = player:GetAssignedHero()
    if not hero then
        return
    end

    if not (IsValidEntity(hero) and hero:IsAlive()) then
        hero.bMovingDown = false
        ShowError("ed_hud_error_cannot_move", keys.PlayerID)
        return
    end

    if not hero.m_MovingTimer then
        createMovingTimer(hero)
    end

    hero.bMovingDown = false
end
function CEDGameMode:On_ed_player_end_move_left(keys)
    local player = PlayerResource:GetPlayer(keys.PlayerID)
    if not player then
        return
    end
    local hero = player:GetAssignedHero()
    if not hero then
        return
    end

    if not (IsValidEntity(hero) and hero:IsAlive()) then
        hero.bMovingLeft = false
        ShowError("ed_hud_error_cannot_move", keys.PlayerID)
        return
    end

    if not hero.m_MovingTimer then
        createMovingTimer(hero)
    end

    hero.bMovingLeft = false
end
function CEDGameMode:On_ed_player_end_move_right(keys)
    local player = PlayerResource:GetPlayer(keys.PlayerID)
    if not player then
        return
    end
    local hero = player:GetAssignedHero()
    if not hero then
        return
    end

    if not (IsValidEntity(hero) and hero:IsAlive()) then
        hero.bMovingRight = false
        ShowError("ed_hud_error_cannot_move", keys.PlayerID)
        return
    end

    if not hero.m_MovingTimer then
        createMovingTimer(hero)
    end

    hero.bMovingRight = false
end