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

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: Collision Detection

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 35: Detect Brick Collisions

当球碰到砖块的时候，我们将使用与球板碰撞相同的方法来检查向哪边运行。代码如下：

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functionremoveBrick(e)

-- Check the which side of the brick the ball hits, left, right

if(e.other.name == 'brick'and (ball.x + ball.width * 0.5) < (e.other.x + e.other.width * 0.5)) then

xSpeed = -5

elseif(e.other.name == 'brick'and (ball.x + ball.width * 0.5) >= (e.other.x + e.other.width * 0.5)) then

xSpeed = 5

end

end

 

 

Step 37: Remove Brick

当球碰到砖块的时候，砖块会消失

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-- Bounce, Remove

if(e.other.name == 'brick') then

ySpeed = ySpeed * -1

e.other:removeSelf()

e.other = nil

bricks.numChildren = bricks.numChildren - 1

 

 

Step 38: Add Score

每碰到一个砖块将获得100分

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score = score + 1

scoreNum.text = score * SCORE_CONST

scoreNum:setReferencePoint(display.CenterLeftReferencePoint)

scoreNum.x = 54

end

 

Step 39: Check Bricks

当砖块全部被消掉的时候，玩家获胜

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if(bricks.numChildren < 0) then

alert('  You Win!', '  Next Level ›')

gameEvent = 'win'

end

end

 

 

Step 40: Ball Movement

球的移动通过xSpeed和ySpeed变量来控制，当update函数执行的时候，球将会开始移动

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functionupdate(e)

-- Ball Movement

ball.x = ball.x + xSpeed

ball.y = ball.y + ySpeed

 

 

Step 41: Wall Collision

下面的代码检查球与墙的碰撞，并且当发生碰撞的时候给球一个反的移动方向

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if(ball.x < 0) then ball.x = ball.x + 3 xSpeed = -xSpeed end--Left

if((ball.x + ball.width) > display.contentWidth) then ball.x = ball.x - 3 xSpeed = -xSpeed end--Right

if(ball.y < 0) then ySpeed = -ySpeed end--Up

 

 

Step 42: Loss Condition

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if(ball.y + ball.height > paddle.y + paddle.height) then alert('  You Lose', '  Play Again ›') gameEvent = 'lose'end--down/lose

 

 

Step 43: Game Status Message

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functionalert(t, m)

gameListeners('remove')

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

box = display.newImage('alertBox.png', 90, 202)

transition.from(box, {time = 300, xScale = 0.5, yScale = 0.5, transition = easing.outExpo})

titleTF = display.newText(t, 0, 0, 'akashi', 19)

titleTF:setTextColor(254,203,50)

titleTF:setReferencePoint(display.CenterReferencePoint)

titleTF.x = display.contentCenterX

titleTF.y = display.contentCenterY - 15

msgTF = display.newText(m, 0, 0, 'akashi', 12)

msgTF:setTextColor(254,203,50)

msgTF:setReferencePoint(display.CenterReferencePoint)

msgTF.x = display.contentCenterX

msgTF.y = display.contentCenterY + 15

box:addEventListener('tap', restart)

alertScreen = display.newGroup()

alertScreen:insert(alertBg)

alertScreen:insert(box)

alertScreen:insert(titleTF)

alertScreen:insert(msgTF)

end

 

 

Step 44: Restart

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functionrestart(e)

if(gameEvent == 'win'and table.maxn(levels) > currentLevel) then

currentLevel = currentLevel + 1

changeLevel(levels[currentLevel])--next level

levelNum.text = tostring(currentLevel)

elseif(gameEvent == 'win'and table.maxn(levels) <= currentLevel) then

box:removeEventListener('tap', restart)

alertScreen:removeSelf()

alertScreen = nil

alert('  Game Over', '  Congratulations!')

gameEvent = 'finished'

elseif(gameEvent == 'lose') then

changeLevel(levels[currentLevel])--same level

elseif(gameEvent == 'finished') then

addMenuScreen()

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

box:removeEventListener('tap', restart)

alertScreen:removeSelf()

alertScreen = nil

currentLevel =

scoreText:removeSelf()

scoreText = nil

scoreNum:removeSelf()

scoreNum = nil

levelText:removeSelf()

levelText = nil

levelNum:removeSelf()

levelNum = nil

ball:removeSelf()

ball = nil

paddle:removeSelf()

paddle = nil

score = 0

end

end

 

 

Step 45: Change Level

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functionchangeLevel(level)

-- Clear Level Bricks

bricks:removeSelf()

bricks.numChildren = 0

bricks = display.newGroup()

-- Remove Alert

box:removeEventListener('tap', restart)

alertScreen:removeSelf()

alertScreen = nil

-- Reset Ball and Paddle position

ball.x = (display.contentWidth * 0.5) - (ball.width * 0.5)

ball.y = (paddle.y - paddle.height) - (ball.height * 0.5) -2

paddle.x = display.contentWidth * 0.5

-- Redraw Bricks

buildLevel(level)

-- Start

background:addEventListener('tap', startGame)

end

 

 

Step 46: Call Main Function

调用Main()函数来开始程序

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Main()

 

 

Step 47: Create the Loading Screen

添加Default.png到工程目录，Corona编译器会自动将其添加为Loading Screen

 

Step 48: Icon

注意不同平台需要的icon大小不一样

 

 

Step 49: Testing in the Simulator

使用Corona模拟器打开项目所在目录即可进行测试

 

Step 50: Build

从Corona模拟器的File菜单中选择Build即可开始编译

 

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

 

 

 

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: Collision Detection