CODEWITHSUNDEEP
randomluacoronasdk
Dips
Dips

Reputation: 145

Math.random specific values corona sdk

I have a set of pre-declared values to set specific rotations for an object. 

local rotations = {900,-900}

And want my spawn function for the blocks to randomly pick one or the other from this function:

local blocks = {}
timerSrc = timer.performWithDelay(1200, createBlock, -1)

function createBlock(event)
   b = display.newImageRect("images/block8.png", 20, 150)
   b.x = 500
   b.y = math.random(100,250)
   b.name = 'block'
   physics.addBody(b, "static")
   transition.to( b, { rotation = math.random(rotations), time = math.random(2700,3700)} )
   blocks:insert(b)
end

When I use: 

 rotation = math.random(-900,900)

it just chooses any values between the 2 numbers rather than 1 or the other. How can I do this correctly ?

Upvotes: 2

Views: 797

Answers (1)

Yu Hao
Yu Hao

Reputation: 122383

If m is an integer value, math.random(m) returns integers in range [1, m] randomly. So math.random(2) returns integers 1 or 2 randomly.

To generate random numbers either 900 or -900, use:

rotation = math.random(2) == 1 and 900 or -900

Upvotes: 4

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