Random values in Draw?

Questions
1

Hi, I have a grid of circles iterated on the x and y axis. I want to assign individual random sizes to them but because of the draw function the random numbers change every frame and animate the size rather than assigning a static value to each object. Suggestions? Thank you!

2

Hi Superflea… one way to approach this would be to create a table in the setup() function with a random size for each ellipse and then iterate through this table in your draw routine (using ipairs) to assign the random size to each ellipse…

HTH!

3

Another solution would be to set the random seed at the start of the draw() call. This ensures that exactly the same sequence of numbers is generated each time:

function draw()
    background( 0 )

    math.randomseed( 1234 )

    ellipse( 100, 100, math.random( 10, 100 ) )

    ellipse( 200, 200, math.random( 10, 100 ) )

    ellipse( 300, 300, math.random( 10, 100 ) )
end

Edit: I think @Blanchot’s solution is better. This is just an alternative.

4

Thank you for the replies, I’ll give it a try and let you know!

5

Worked like a charm, thanks!

For the record, I used Simeon’s method, but added a random in the setup() to provide the seed for the randomseed, so that each time I run the program the outcome is different.

Must say that Codea is proving hugely instructive and fun!