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[DPRG] math I once knew

Subject: [DPRG] math I once knew
From: Dave Hylands dhylands at broadcom.com
Date: Fri Dec 20 10:08:01 CST 2002

Hi Sluggy,

I think that this is what you want:

x = r * sin( theta )
y = r * cos( theta )

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/


> -----Original Message-----
> From: Sluggy! [mailto:slugmusk at linuxlegend.com]
> Sent: Friday, December 20, 2002 7:50 AM
> To: dprg
> Subject: [DPRG] math I once knew
> 
> 
> Hey, folks...
> 
> I have a question about some math I once knew but don't remember the 
> details of.
> 
> I need to be able to plot X and Y coordinates for points laying in a 
> circle, in this case, the minute and hour points on a clock face.
> 
> I used to do this all the time drawing circles and radar 
> screens and the 
> like on the Commodore 64 and even on my first IBM clone. Thus far, 
> everything I have found online seems to be a tool to give you 
> back the 
> picture, not the coordinates for the points.
> 
> As I recall, the algorithm was such that you plug in the 
> coordinates of 
> the center point, units of diameter and an an angle in degrees for a 
> given point. To scribe a circle, you simply stepped through 
> the range on 
> 0 to 359 for the angle, drawing a line between each set of points. 
> Actually, I think there were two steps, one for the X coordinate, one 
> for the Y.
> 
> Anyway, if anyone has a lead on this, it would be appreciated! :)
> 
> Sluggy!
> 
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