COS


cos( x )
cos "cosine"
x a number

The cos( x ) function is used to return the cosine of the number provided.



An example from the manual shows us how to draw a rotating dial using cos() and sin():

function _draw()
  cls()
  circ(64, 64, 20, 7)
  x = 64 + cos(t()) * 20
  y = 64 + sin(t()) * 20
  line(64, 64, X, Y)
end


We've slowed it down and added some more details to show what is happening here:

function _draw()
  cls()
  circ(64, 64, 20, 5)
  x = 64 + cos(t()/5) * 20
  y = 64 + sin(t()/5) * 20
  line(64, 64, x, 64,8)  -- x-axis cosine
  line(64, 64, 64, y,11) -- y-axis sine
  line(64, 64, x, y,6)   -- main dial line
  pset(x, y,12)          -- (x,y) point
end


432

4 Sep 2023

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