Computer Science Canada

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

Author:	cycro1234 [ Sat Oct 30, 2004 8:35 pm ]
Post subject:	x^2/a^2 + y^2/b^2 = 1
What do I do with it though???

Author:	bugzpodder [ Sat Oct 30, 2004 8:46 pm ]
Post subject:
what do you want to do with it?

Author:	cycro1234 [ Sat Oct 30, 2004 9:59 pm ]
Post subject:
make a ball travel in an arc

Author:	AsianSensation [ Sun Oct 31, 2004 5:36 pm ]
Post subject:
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.

Author:	bugzpodder [ Sun Oct 31, 2004 7:38 pm ]
Post subject:
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) )

Author:

wtd [ Sun Oct 31, 2004 11:14 pm ]

Post subject:

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

code:

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

Author:	cycro1234 [ Tue Nov 02, 2004 1:25 pm ]
Post subject:	Un huh
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?

Author:	bugzpodder [ Tue Nov 02, 2004 1:44 pm ]
Post subject:
of course the answer will be in terms of a and b

Author:	cycro1234 [ Tue Nov 02, 2004 6:29 pm ]
Post subject:	ok...
Alright, but then wat exactly are the variables a and b?? Are they the angle of the circle?

Author:	AsianSensation [ Tue Nov 02, 2004 8:08 pm ]
Post subject:
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.

Author:	templest [ Wed Nov 03, 2004 1:41 pm ]
Post subject:
Quote: 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 You get hundred bits now! Good stuff.

Author:	rizzix [ Wed Nov 03, 2004 4:35 pm ]
Post subject:
ah yea.. nice stuff..

Author:	cycro1234 [ Wed Nov 03, 2004 7:27 pm ]
Post subject:	hehehe
dam straight!

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