On Fri, 31 May 2002, Michael Geier wrote:
> my arc runs from 180 deg. to 360/0 degree, or left to right, pointing
> upwards (upside down U).
> i guess I am not getting my head around the numbers...is there anywhere on
> the net that has a good thorough description about a process like this?
http:
el Geier'; Php-General
> Subject: RE: [PHP] gd project question
>
>
> Good day,
>
> Wow, a high school math question.
>
> You should use asin() and acos() of the angle to get the y and x
> differentials, respectively. Multiply the result by the size of
> the needle.
Good day,
Wow, a high school math question.
You should use asin() and acos() of the angle to get the y and x
differentials, respectively. Multiply the result by the size of the needle.
This assumes that your guage is oriented horizontally, and the needle sweeps
from right to left, pointing upw
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