Calculate the Angle Between 2 points

[jacklloyd]

Is it possible to calculate the angle between 2 points? I haven't found anything in the API that will give me the angle of a polyline I select in the viewer, but I can get the vertices for the start and end points of the feature. What I need to be able to do is get the angle between those 2 points. I have searched for solutions using javascript and have found the atan2() function that might work, but it looks pretty complicated. Any suggestions?

Jack

[Anonymous]

Jack,

That's probably going to be the easiest way. 
Here's some sample code that works.  Note that the trigonometric functions
in JavaScript returns angles in radians, hence the conversion to
degrees:

var x1=0;
var x2=45;
var y1=0;
var
y2=45;
var pi = Math.PI;
var angleRad=Math.atan((y2-y1)/(x2-x1));
var
angleDeg=angleRad*(180/pi);
alert(angleRad);
alert(angleDeg); 

You'll also have to do some checking in the code
for the orientation of the line so that the proper angle is
calculated.

--
Andy Morsell, P.E.
Spatial
Integrators, Inc.

href="http://www.spatialgis.com">http://www.spatialgis.com

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"jlloyd" <
href="mailto:jlloyd@dot.co.pima.az.us">jlloyd@dot.co.pima.az.us> wrote
in message
href="news:f189060.-1@WebX.maYIadrTaRb">news:f189060.-1@WebX.maYIadrTaRb...

Is
it possible to calculate the angle between 2 points? I haven't found anything
in the API that will give me the angle of a polyline I select in the viewer,
but I can get the vertices for the start and end points of the feature. What I
need to be able to do is get the angle between those 2 points. I have searched
for solutions using javascript and have found the atan2() function that might
work, but it looks pretty complicated. Any suggestions?

Jack

[jacklloyd]

Andy,

Your the man! I plugged this in, changed the variable names to the ones I already had, added the code for angle orientation and viola! Thanks again.

Jack