Create a Brick Breaker Game with the Corona SDK: Game Controls

来源：互联网发布：记账软件onlinedown 编辑：程序博客网时间：2024/06/06 20:39

原创文章，转载请注明： 转载自All-iPad.net 本文链接地址: Create a Brick Breaker Game with the Corona SDK: Game Controls

这是系列教程的第二部分，完整内容点击下页的链接：

Create a Brick Breaker Game with the Corona SDK: Application Setup
Create a Brick Breaker Game with the Corona SDK: Game Controls
Create a Brick Breaker Game with the Corona SDK: Collision Detection

Step 16: Function Declarations

在第15步我们定义了保存关卡数据的多维数组，接下来我们将定义会用到的函数

local addMenuScreen = {}

local tweenMS = {}

local hideAbout = {}

local rmvAbout = {}

local addGameScreen = {}

local buildLevel = {}

local movePaddle = {}

local gameListeners = {}

local startGame = {}

local update = {}

local bounce = {}

local removeBrick = {}

local alert = {}

local restart = {}

local changeLevel = {}

Step 17: Constructor Code

接下来是主函数Main()；该函数在程序启动的时候会被调用

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local function Main()

addMenuScreen()

end

Step 18: Add Menu Screen

接下来的代码片段把主界面图像添加到画布上，并且将其保存到menuScreen组

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function addMenuScreen()

menuScreen = display.newGroup()

mScreen = display.newImage('mScreen.png')

startB = display.newImage('startB.png')

startB.name = 'startB'

aboutB = display.newImage('aboutB.png')

aboutB.name = 'aboutB'

menuScreen:insert(mScreen)

startB.x = 160

startB.y = 260

menuScreen:insert(startB)

aboutB.x = 160

aboutB.y = 310

menuScreen:insert(aboutB)

Step 19: Button Listeners

添加按钮响应函数

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startB:addEventListener('tap', tweenMS)

aboutB:addEventListener('tap', tweenMS)

end

Step 20: Call About Screen

按钮响应函数的实现代码

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function tweenMS:tap(e)

if(e.target.name == 'startB') then

-- Start Game

transition.to(menuScreen, {time = 300, y = -menuScreen.height, transition = easing.outExpo, onComplete = addGameScreen})

else

-- Call AboutScreen

aboutScreen = display.newImage('aboutScreen.png')

transition.from(aboutScreen, {time = 300, x = menuScreen.contentWidth, transition = easing.outExpo})

aboutScreen:addEventListener('tap', hideAbout)

Step 21: Hide Menu Buttons

下面几行代码用于隐藏主菜单界面

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startB.isVisible = false;

aboutB.isVisible = false;

end

Step 23: Remove About Screen

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function hideAbout:tap(e)

transition.to(aboutScreen, {time = 300, x = aboutScreen.width*2, transition = easing.outExpo, onComplete = rmvAbout})

end

function rmvAbout()

aboutScreen:removeSelf()

-- Enable Menu Buttons

startB.isVisible = true;

aboutB.isVisible = true;

end

Step 24: Destroy Menu Screen

当玩家点击start按钮的时候，我们首先要做的是销毁菜单界面，然后再创建游戏界面

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function addGameScreen()

-- Destroy Menu Screen

menuScreen:removeSelf()

menuScreen = nil

Step 25: Add Game Screen

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-- Add Game Screen

paddle = display.newImage('paddle.png')

ball = display.newImage('ball.png')

paddle.x = 160

paddle.y = 460

ball.x = 160

ball.y = 446

paddle.name = 'paddle'

ball.name = 'ball'

Step 26: Call Build Level Function

接下来我们将构建关卡，该函数在后面解释

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buildLevel(levels[1])

Step 27: Scores & Levels Text

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scoreText = display.newText('Score:', 5, 2, 'akashi', 14)

scoreText:setTextColor(254, 203, 50)

scoreNum = display.newText('0', 54, 2, 'akashi', 14)

scoreNum:setTextColor(254,203,50)

levelText = display.newText('Level:', 260, 2, 'akashi', 14)

levelText:setTextColor(254, 203, 50)

levelNum = display.newText('1', 307, 2, 'akashi', 14)

levelNum:setTextColor(254,203,50)

Step 28: Start Listener

我们在背景图上添加一个监听器，当玩家点击背景图后开始游戏

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background:addEventListener('tap', startGame)

end

Step 29: Move Paddle

我们使用平衡仪来控制球板

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function movePaddle:accelerometer(e)

-- Accelerometer Movement

paddle.x = display.contentCenterX + (display.contentCenterX * (e.xGravity*3))

Step 30: Paddle Border Collision

我们在屏幕边缘放置不可见的边框来防止球板跑到屏幕外面去

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if((paddle.x - paddle.width * 0.5) < 0) then

paddle.x = paddle.width * 0.5

elseif((paddle.x + paddle.width * 0.5) > display.contentWidth) then

paddle.x = display.contentWidth - paddle.width * 0.5

end

Step 31: Build Level Function

关卡构建函数

该函数使用两层循环来检查关卡数据，在数据为1的地方放置砖块。注意在生成砖块的时候将其物理数据设置为static，这表示其不会主动做碰撞检测，在程序中只有唯一的一个dynamic对象，球，来做碰撞检测。

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function buildLevel(level)

-- Level length, height

local len = table.maxn(level)

bricks:toFront()

for i = 1, len do

for j = 1, W_LEN do

if(level[i][j] == 1) then

local brick = display.newImage('brick.png')

brick.name = 'brick'

brick.x = BRICK_W * j - OFFSET

brick.y = BRICK_H * i

physics.addBody(brick, {density = 1, friction = 0, bounce = 0})

brick.bodyType = 'static'

bricks.insert(bricks, brick)

end

Step 32: Game Listeners

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function gameListeners(action)

if(action == 'add') then

Runtime:addEventListener('accelerometer', movePaddle)

--Runtime:addEventListener('enterFrame', update)

paddle:addEventListener('collision', bounce)

--ball:addEventListener('collision', removeBrick)

else

Runtime:removeEventListener('accelerometer', movePaddle)

--Runtime:removeEventListener('enterFrame', update)

paddle:removeEventListener('collision', bounce)

--ball:removeEventListener('collision', removeBrick)

end

Step 33: Start Game

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function startGame:tap(e)

background:removeEventListener('tap', startGame)

gameListeners('add')

-- Physics

physics.addBody(paddle, {density = 1, friction = 0, bounce = 0})

physics.addBody(ball, {density = 1, friction = 0, bounce = 0})

paddle.bodyType = 'static'

end

Step 34: Paddle-Ball Collisions

当球碰到球板的时候，ySpeed被设为负值，这样让其向上移动。我们同时也会检查球碰到了球板的哪一边，以决定它向哪边移动。

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function bounce(e)

ySpeed = -5

-- Paddle Collision, check the which side of the paddle the ball hits, left, right

if((ball.x + ball.width * 0.5) < paddle.x) then

xSpeed = -5

elseif((ball.x + ball.width * 0.5) >= paddle.x) then

xSpeed = 5

end

-- Run the Code

Main()

Next in the Series

接下来我们将会处理砖块和墙的碰撞，以及分数的显示，测试，构建app等等。

原文地址：http://mobile.tutsplus.com/tutorials/corona/create-a-brick-breaker-game-with-the-corona-sdk-game-controls/

原创文章，转载请注明： 转载自All-iPad.net

本文链接地址: Create a Brick Breaker Game with the Corona SDK: Game Controls