Lua Breakout游戏教程：球的怪异行为

Question

我跟着这个tutorial进行了突破性比赛，但是在某些时候，当球角太大（太水平）时，球仍然靠在顶壁上。我可以调整任何逻辑，以便球可以避免这种行为吗？

以下是截图：

球的相关源代码是：

local ballRadius = 10
ball = display.newCircle( display.contentWidth / 2, display.contentHeight / 2, ballRadius )
physics.addBody(ball, "dynamic", {friction=0, bounce = 1, radius=ballRadius})

Answer 1

这有点奇怪。但我这样做过一次......

创建3个变量/标志：

local horizontalMotionFlag,yPos_1,yPos_2 = 0,0,0

然后：

wall.type = "LeftWall"  -- to the LeftWall
            -- and --
wall.type = "RightWall"  -- to the RightWall

在event.phase == "ended"

中添加以下行

------------------------------------------------------------------------------------------

if(event.other.type == "LeftWall") then
    yPos_1 = ball.y
    if(horizontalMotionFlag==0)then
        horizontalMotionFlag = 1
    else
        if(math.abs(yPos_1-yPos_2) < 50)then
            print("CoHorizontal motion detected. Change angle...1")
            horizontalMotionFlag = 0
            ball:applyForce( 0, 1, ball.x, ball.y )  -- apply a small downward force
            ball:applyForce( 0, 0, ball.x, ball.y )  -- resetting the force
            -- You can also check the direction of ball and apply force to -1(upwards) also --
        end
    end
end

if(event.other.type == "RightWall") then
    yPos_2 = ball.y
    if(horizontalMotionFlag==0)then
        horizontalMotionFlag = 1
    else
        if(math.abs(yPos_1-yPos_2) < 50)then
            print("CoHorizontal motion detected. Change angle...")
            horizontalMotionFlag = 0
            ball:applyForce( 0, 1, ball.x, ball.y )  -- apply a small downward force
            ball:applyForce( 0, 0, ball.x, ball.y )  -- resetting the force
            -- You can also check the direction of ball and apply force to -1(upwards) also --
        end
    end
end
------------------------------------------------------------------------------------------

然后在event.other.type == "destructible"和event.other.type == "bottomWall"：

中添加以下行

horizontalMotionFlag = 0;

保持编码.............：）