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Richard Hayes wrote:
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<div><font face="Arial" size="2">Hello guys.</font></div>
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<div><font face="Arial" size="2">Slightly off topic, but it's
something I'm programming in PHP on a Linux server so it kind of counts.</font></div>
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<div><font face="Arial" size="2">I'm writing some stuff in GD lib
(php) which draws me nice graphs. Except I can't remember a thing about
trigonometry from school and I'm struggling.</font></div>
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<div><font face="Arial" size="2">I have two set of coordinates, eg:<br>
</font></div>
<div><font face="Arial" size="2">1. 0,0</font></div>
<div><font face="Arial" size="2">2. 25,25</font></div>
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<div><font face="Arial" size="2">With a line drawn between them.</font></div>
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<div><font face="Arial" size="2">I know that this line is at 135
degrees from 0 (correct me if i'm wrong!). What calculation can I do on
these number to give this this amount in degrees?</font></div>
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<div><font face="Arial" size="2">(Or, let's say my coords are 0,0
drawn to 50,0, then my angle is 90 degrees (a right angle).)</font></div>
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<div><font face="Arial" size="2">It's really as simple as that.</font></div>
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<div><font face="Arial" size="2">I've googled and googled and
googled, but I'm beat.</font></div>
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<div><font face="Arial" size="2">Any help?</font></div>
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sounds like you are trying to convert between polar and rectangular<font
face="Century Gothic, Arial, Helvetica"> coordinates? , if so</font> :-<br>
<a class="moz-txt-link-freetext" href="http://www.teacherschoice.com.au/Maths_Library/Coordinates/polar_-_rectangular_conversion.htm">http://www.teacherschoice.com.au/Maths_Library/Coordinates/polar_-_rectangular_conversion.htm</a><br>
has some info on this (including the formulas)<br>
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Thanks!</font></div>
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<div><font face="Arial" size="2">Kind regards,</font></div>
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<div><font face="Arial" size="2">Richard Hayes<br>
DomainArena<br>
<a href="mailto:ricky@domainarena.net">ricky@domainarena.net</a></font></div>
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