Circle Formula - GameCreators Forum

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Pyro_guy

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Joined: 10th Oct 2003

Location: England

Posted: 22nd Jan 2004 22:28

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Could anyone help me out here?

I'm trying to put together a rotating camera system that will act like this:
When the user holds down the left/right key on the keyboard, the camera will rotate in a circle around an object. The object will be able to move so the center of the 'camera circle' must be adjustable.

I figure I need some kind of formula that will draw a circle of 'r' radius around points 'x' and 'y'

hope thats clear enough

Thanks in advance

Screw the rules...what can i blow up?

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IanM

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Location: In my moon base

Posted: 22nd Jan 2004 22:35

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This is how you do it.

The first way uses the 'easy' functions provided only by DBPro. The second uses the 'standard' way using sin and cos.

+ Code Snippet

Radius = 50
X = 100
Y = 100

for Angle = 0 to 359
   dot NewXValue( X, Angle, Radius ), NewZValue( Y, Angle, Radius )
next Angle

X = 200
Y = 200

for Angle = 0 to 359
   dot X + (sin(Angle) * Radius), Y + (cos(Angle) * Radius)
next Angle

wait key

For free Plug-ins, source and the DBPro Interface library for Visual C++ 6 and .NET
http://www.matrix1.demon.co.uk

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Lord Helmet

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Posted: 22nd Jan 2004 22:36

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Turn Camera Left()
Turn Camera Right()
both turn the camera around in circles, hit f1 for instructions on how to use the commands

I think it was rotate camera Y() that rotated it around its y axis in degrees.

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Mentor

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Location: United Kingdom

Posted: 22nd Jan 2004 22:59 Edited at: 22nd Jan 2004 23:01

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redundant info

deleted

Mentor.

System spec : Pentium 3.0Ghz, 512MB DDR, 2x160Gb HD (using icewave hd coolers ), DVD RW/CD RW (all modes), multimedia front panel, 6 way surround sound, ATI radeon 9800Pro 128mb.

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Pyro_guy

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Posted: 22nd Jan 2004 23:04

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Thanks Mentor, thats just what i needed

perhaps if i used the word 'orbiting' it would have made it clearer