trig functions

gespeichert von dp am 23.August 98 um 18:39:24:

Examples of how to move sprites using trig functions are at:

rotor
liquidMeter

It's no big secret; here are some trig functions, including arcSine and
arcCosine:



on degreesToRadians degrees
  return pi() * degrees / 180
end

--
on radiansToDegrees radians
  return radians * 180 / pi()
end

--
on cosine degrees
  return cos( degreesToRadians( degrees ))
end

--
on sine degrees
  return sin( degreesToRadians( degrees ))
end

--
on tangent degrees
  return tan( degreesToRadians( degrees ))
end

--
on arcSine sine
  return radiansToDegrees( atan( sine / sqrt(1 - power( sine, 2))))
end

--
on arcCosine cosine
  return radiansToDegrees( atan( sqrt(1 - power( cosine, 2)) / cosine))
end

--
on arcTangent tangent
  return radiansToDegrees( atan( tangent ))
end

--
on degrees theta
  if theta > 360 then
    put theta - 360 into theta
  else if theta < 0 then
    put 360 + theta into theta
  end if
  return theta
end
--


another bit (by Jorge Peña):

> Does anyone have Lingo functions for hyperbolic cosine and hyperbolic
sine-- "cosh" and "sinh"?  (Danny?)

I don't think that direct functions are built in Director...

You could calculate them from their mathematical definitions:

sinh(x)=(1/2) * ((e^x) - (e^(-x)))

cosh(x)=(1/2) * ((e^x) + (e^(-x)))

Home	me	Director	Lingo Toolbox	Shocklet Gallery	shock + cgi	Contact

D. Plänitz