public function inverse($pt)
{
$x = ($pt->x - $this->_proj->x0) / $this->_proj->k0;
$y = $this->_proj->rh - ($pt->y - $this->_proj->y0) / $this->_proj->k0;
if ($this->_proj->ns > 0) {
$rh1 = sqrt($x * $x + $y * $y);
$con = 1.0;
} else {
$rh1 = -sqrt(x * x + y * y);
$con = -1.0;
}
$theta = 0.0;
if ($rh1 != 0) {
$theta = atan2($con * $x, $con * $y);
}
if ($rh1 != 0 || $this->_proj->ns > 0.0) {
$con = 1.0 / $this->_proj->ns;
$ts = pow($rh1 / ($this->_proj->a * $this->_proj->f0), $con);
$lat = Sourcemap_Proj::phi2z($this->_proj->e, $ts);
if ($lat == -9999) {
return null;
}
} else {
$lat = -Sourcemap_Proj::HALF_PI;
}
$lon = Sourcemap_Proj::adjust_lon($theta / $this->_proj->ns + $this->_proj->long0);
$pt->x = $lon;
$pt->y = $lat;
return $pt;
}
public function inverse($p)
{
# $delta_lon; /* Delta longitude (Given longitude - center */
# $theta; /* angle */
# $delta_theta; /* adjusted longitude */
# $sin_phi, $cos_phi;/* sin and cos value */
# $b; /* temporary values */
# $c, $t, $tq; /* temporary values */
# $con, $n, $ml; /* cone constant, small m */
# $vs, $us, $q, $s, $ts1;
# $vl, $ul, $bs;
# $dlon;
# $flag;
/* Inverse equations
-----------------*/
$p->x -= $this->x0;
$p->y -= $this->y0;
$flag = 0;
$vs = $p->x * $this->cosaz - $p->y * $this->sinaz;
$us = $p->y * $this->cosaz + $p->x * $this->sinaz;
$us = $us + $this->u;
$q = exp(-$this->bl * $vs / $this->al);
$s = 0.5 * ($q - 1.0 / $q);
$t = 0.5 * ($q + 1.0 / $q);
$vl = sin($this->bl * $us / $this->al);
$ul = ($vl * $this->cosgam + $s * $this->singam) / $t;
if (abs(abs($ul) - 1.0) <= Sourcemap_Proj::EPSLN) {
$lon = $this->longc;
if ($ul >= 0.0) {
$lat = Sourcemap_Proj::HALF_PI;
} else {
$lat = -Sourcemap_Proj::HALF_PI;
}
} else {
$con = 1.0 / $this->bl;
$ts1 = pow($this->el / sqrt((1.0 + $ul) / (1.0 - $ul)), $con);
$lat = Sourcemap_Proj::phi2z($this->e, $ts1);
//if (flag != 0)
//return(flag);
//~ con = cos($this->bl * us /al);
$theta = $this->longc - atan2($s * $this->cosgam - $vl * $this->singam, $con) / $this->bl;
$lon = Sourcemap_Proj::adjust_lon($theta);
}
$p->x = $lon;
$p->y = $lat;
return $p;
}
public function inverse($pt)
{
$x = $pt->x - $this->_proj->x0;
$y = $pt->y - $this->_proj->y0;
if ($this->_proj->sphere) {
$lat = Sourcemap_Proj::HALF_PI - 2.0 * atan(exp(-$y / $this->_proj->a * $this->_proj->k0));
} else {
$ts = exp(-$y / ($this->_proj->a * $this->_proj->k0));
$lat = Sourcemap_Proj::phi2z($this->_proj->e, $ts);
if ($lat == -9999) {
throw new Exception("Lat = -9999");
}
}
$lon = Sourcemap_Proj::adjust_lon($this->_proj->long0 + $x / ($this->_proj->a * $this->_proj->k0));
$pt->x = $lon;
$pt->y = $lat;
return $pt;
}