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getAngle- Determine the angle of a line

This function returns the angle in degrees made by the specified line and the horizontal axis. It is used internally for some trigonometric computing.

Calling this function
Where :

X1,Y1 is the start coordinate of the line.
X2,Y2 is the end coordinate of the line.

Sample script

 /* Return the angle made by this line and the horizontal axis */
 echo $myPicture->getAngle(10,10,200,200);

This will print 45.
Last updated on 10/19/2009 
by Jean-Damien 
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