gistfile1.php

<?php
        $distance = distance($src['lat'], $src['lng'], $dest['lat'], $dest['lng']);
        $angle = getangle($src['lat'], $src['lng'], $dest['lat'], $dest['lng']);
        $headdist = max($diststance * .95, $distance - .01);

        $head = circle::getLatLngByAngle($src, $angle, $distance + $radius);
        $srcleft = circle::getLatLngByAngle($src, $angle - 90, $radius);
        $srcright = circle::getLatLngByAngle($src, $angle + 90, $radius);
        $headleft = circle::getLatLngByAngle($srcleft, $angle, $headdist);
        $headright = circle::getLatLngByAngle($srcright, $angle, $headdist);