Lua 创建多个碰撞。

2013-5-9 2:51:32
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我正在尝试创建一个打砖块游戏，其中的砖块可以被击中两次才会消失。

我尝试过：

 --FOR STRONGER DEFENDERS
        for i = 1, len do
            for j = 1, level_W do
                if(level[i][j] == 2) then
                    local strong = display.newImage('images/strongdefender.png')
                    strong.name = 'strong'
                    strong.x = def_W * j - offset
                    strong.y = def_H * i
                    physics.addBody(strong, {density = 1, friction = 0, bounce = 0})
                    strong.bodyType = 'static'
                    strongs.insert(strongs, strong)
                end
            end
        end
        for i = 1, len do
            for j = 1, level_W do
                if(level[i][j] == 2) then
                local defender = display.newImage('images/defender.png')
                    defender.name = 'defender'
                    defender.x = def_W * j - offset
                    defender.y = def_H * i
                    physics.addBody(defender, {density = 1, friction = 0, bounce = 0})
                    defender.bodyType = 'static'
                end
            end
        end

level 是一个填充着 0 和 2 的表格。2 是防御者图像会出现的位置。

我的碰撞事件如下：

function onCollision(e)

        if(e.other.name == 'defender' or e.other.name == 'strong' and (ball.x + ball.width * 0.5) < (e.other.x + e.other.width * 0.5)) then
            xSpeed = -5
        elseif(e.other.name == 'defender' or e.other.name == 'strong' and (ball.x + ball.width * 0.5) >= (e.other.x + e.other.width * 0.5)) then
            xSpeed = 5
        end

        if(e.other.name == 'defender') then
            audio.play(defencePop)
            ySpeed = ySpeed * -1
            e.other:removeSelf()
            e.other = nil
            defenders.numChildren = defenders.numChildren - 1

            --SORT SCORE
            score = score + 1
            scoreNum.text = score * points
            scoreNum:setReferencePoint(display.CenterLeftReferencePoint)
            scoreNum.x = 54
        elseif(e.other.name == 'strong') then
            audio.play(defencePop)
            ySpeed = ySpeed * -1
            e.other:removeSelf()
            e.other = nil
            defenders.numChildren = defenders.numChildren - 1

            --SORT SCORE
            score = score + 1
            scoreNum.text = score * points
            scoreNum:setReferencePoint(display.CenterLeftReferencePoint)
            scoreNum.x = 54

        end

        --defenders.numChildren < 0
        if(strongs.numChildren < 0) then
            bgAlert('win')
            gameStatus = 'win'
        end
    end -- removeDefender

当球与防御者碰撞时，它们都会消失。如何使它们一个一个地消失？

点赞
用户2260388
用户2260388

我建议你只把强防守放在屏幕上，并为它们添加事件侦听器。当强防守发生碰撞时，就会创建一个较弱的砖块。这个想法是在碰撞发生时移除对象并添加一个新对象。

首先，你需要展示强对象并将它们添加到物理世界中。你还需要为对象添加本地碰撞事件侦听器。

 for i = 1, len do
     for j = 1, level_W do
         if(level[i][j] == 2) then
             local strong = display.newImage('images/strongdefender.png')
             strong.name = 'strong'
             strong.x = def_W * j - offset
             strong.y = def_H * i
             physics.addBody(strong, {density = 1, friction = 0, bounce = 0})
             strong.bodyType = 'static'
             strong.collision = onBrickCollision -- onStrongCollision 是碰撞处理器函数的名称。
             strong:addEventListener("collision" , strong) -- 添加碰撞侦听器。
             strongs.insert(strongs, strong)
         end
    end
 end

事件侦听器如下：

function onBrickCollision(self , event)
if event.phase == "began" and event.other.name == "ball" then
    if (ball.x + ball.width * 0.5) < (self.x + self.width * 0.5) then
        xSpeed = -5
    else
        xSpeed = 5
    end
    if self.name == "strong" then
        audio.play(defencePop)
        ySpeed = ySpeed * -1
        -- 在强物体的位置创建防守者并将其添加到物理世界中。
        local defender = display.newImage('images/defender.png')
        defender.name = 'defender'
        将其位置设置为被球撞击的对象的位置。
        defender.x = self.x
        defender.y = self.y
        physics.addBody(defender, {density = 1, friction = 0, bounce = 0})
        defender.bodyType = 'static'
        defender.collision = onBrickCollision
        defender:addEventListener("collision", defender)
        -- 移除强砖块。
        self:removeSelf()
        self = nil
        
        -- 重新排序得分。
        score = score + 1
        scoreNum.text = score * points
        scoreNum:setReferencePoint(display.CenterLeftReferencePoint)
        scoreNum.x = 54

    elseif self.name == "defender" then
        audio.play(defencePop)
        ySpeed = ySpeed * -1
        self:removeSelf()
        self = nil
        defenders.numChildren = defenders.numChildren - 1
        
        -- 重新排序得分。
        score = score + 1
        scoreNum.text = score * points
        scoreNum:setReferencePoint(display.CenterLeftReferencePoint)
        scoreNum.x = 54
    end
end

希望这段代码很容易理解 :)

如果你有任何问题，请随时问我。

2013-05-20 15:38:25

作者:

用户2242977

用户2242977
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