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cycro1234

Sat Oct 30, 2004 8:35 pm


x^2/a^2 + y^2/b^2 = 1

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What do I do with it though???


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bugzpodder

Sat Oct 30, 2004 8:46 pm



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what do you want to do with it?


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cycro1234

Sat Oct 30, 2004 9:59 pm



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make a ball travel in an arc


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AsianSensation

Sun Oct 31, 2004 5:36 pm



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well, you can substitute a value for x, and then it spits out a value for y, and then use the x and y values to draw your thingie, and it will follow an elliptical path.


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bugzpodder

Sun Oct 31, 2004 7:38 pm



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the parametric equation for an ellipse is:
x=acos(t)
y=bsin(t)

just plug in your angle

(or if you want it the other way...
x=asin(t)
y=bcos(t)
)


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wtd

Sun Oct 31, 2004 11:14 pm



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I would recommend breaking this down into a data structure and a number of associated functions and procedures.

type Point : record
   x, y : int
end record

type Arc : record
   center : Point
   radius : int
end record

function makeArc(x, y, radius : int) : Arc
   var a : Arc
   a.center.x := x
   a.center.y := y
   a.radius := radius
   result a
end makeArc

function pointOnArcAtAngle(a : Arc; angle : int) : Point
   var p : Point
   p.x := a.radius * sin(angle) + a.center.x
   p.y := a.radius * cos(angle) + a.center.y
   result p
end pointOnArcAtAngle


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cycro1234

Tue Nov 02, 2004 1:25 pm


Un huh

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AsianSensation, u mentione to substitute a value for x, nd it will spit out a valur for y. What about a and b??? Or will the answer be in terms of a and b?


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bugzpodder

Tue Nov 02, 2004 1:44 pm



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of course the answer will be in terms of a and b


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cycro1234

Tue Nov 02, 2004 6:29 pm


ok...

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Alright, but then wat exactly are the variables a and b?? Are they the angle of the circle?


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AsianSensation

Tue Nov 02, 2004 8:08 pm



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no, they are just some constant, where 2a is the length of the major axis, and the 2b is the length of the minor axis of an ellipse. I suggest searching some math sites, or you'll be learning about ellipses in Gr. 11 math.


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templest

Wed Nov 03, 2004 1:41 pm



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All girls take time and money
Girls = Time x Money
"Time is money" =>
Time = Money
Girls = Money x Money
Girls = Money^2
"Money is the root of all evil" = >
Evil = the square root of money
Girls = (Evil)^1/2 (Evil)^1/2 =>
Girls = Evil

:rofl: You get hundred bits now! http://bbs.pearl-jam.net/images/smilies/chinese.gif Good stuff. :lol:


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rizzix

Wed Nov 03, 2004 4:35 pm



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ah yea.. nice stuff..  :lol:


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cycro1234

Wed Nov 03, 2004 7:27 pm


hehehe

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dam straight!