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#include "pg_sphere.h"
#include "sbuffer.h"
/* Functions to buffer the parser input. */
/* Maximum count of buffered angles. */
#define MAX_BUF_ANGLE 20
/* The type of parsed spherical object. */
unsigned char spheretype;
/* The angle buffer. */
float8 bufangle[MAX_BUF_ANGLE];
/* A simple spherical point. */
typedef struct
{
double lng; /* longitude */
double lat; /* latitude */
} bpoint;
/* Spherical point buffer. */
struct
{
int m; /* count of buffered points */
bpoint *p; /* pointer to array of points */
} bufpoints;
/* ID of line's length angle. */
int bufline;
/*
* First element is the ID of spherical point ( center ).
* Second element is the ID of radius angle.
*/
int bufcircle[2];
/* Buffer of ellipse. */
int bufellipse[5];
/* Buffer of IDs of Euler transformation values. */
int bufeuler[3];
/* Structure to buffer the axes of Euler transformation. */
struct
{
unsigned char phi, /* first axis */
theta, /* second axis */
psi; /* third axis */
} bufeulertype;
/* Current angle ID. */
int bufapos;
/* Current point ID. */
int bufspos;
/* Pointer to input buffer. */
char *parse_buffer;
void
set_spheretype(unsigned char st)
{
spheretype = st;
}
void
init_buffer(char *buffer)
{
spheretype = STYPE_UNKNOWN;
parse_buffer = buffer;
bufapos = 0;
bufspos = 0;
bufeulertype.phi = bufeulertype.psi = EULER_AXIS_Z;
bufeulertype.theta = EULER_AXIS_X;
bufpoints.m = 2;
bufpoints.p = (bpoint *) palloc(bufpoints.m * sizeof(bpoint));
}
void
reset_buffer(void)
{
sphere_flush_scanner_buffer();
pfree(bufpoints.p);
bufpoints.p = NULL;
bufpoints.m = 0;
init_buffer(NULL);
}
int
set_angle_sign(int apos, int s)
{
if (bufangle[apos] > 0 && s < 0)
{
bufangle[apos] *= -1;
}
if (bufangle[apos] < 0 && s > 0)
{
bufangle[apos] *= -1;
}
return apos;
}
int
set_angle(unsigned char is_deg, float8 a)
{
if (is_deg)
{
a /= RADIANS;
}
bufangle[bufapos] = a;
bufapos++;
return (bufapos - 1);
}
int
set_point(int lngpos, int latpos)
{
if (bufspos >= bufpoints.m)
{
bpoint *p = bufpoints.p;
int i = (bufpoints.m * 2);
bufpoints.p = (bpoint *) palloc(i * sizeof(bpoint));
memcpy((void *) bufpoints.p, (void *) p, bufpoints.m * sizeof(bpoint));
bufpoints.m = i;
pfree(p);
}
bufpoints.p[bufspos].lng = bufangle[lngpos];
bufpoints.p[bufspos].lat = bufangle[latpos];
bufspos++;
lngpos = 0;
latpos = 0;
if ((bufapos + 3) > MAX_BUF_ANGLE)
{
bufapos = 0;
}
return (bufspos - 1);
}
void
set_circle(int spos, int rpos)
{
bufcircle[0] = spos;
bufcircle[1] = rpos;
}
void
set_ellipse(int r1, int r2, int sp, int inc)
{
bufellipse[0] = r1;
bufellipse[1] = r2;
bufellipse[2] = sp;
bufellipse[3] = inc;
}
void
set_line(int length)
{
bufline = length;
}
void
set_euler(int phi, int theta, int psi, char *etype)
{
int i;
unsigned char t = 0;
bufeuler[0] = phi;
bufeuler[1] = theta;
bufeuler[2] = psi;
for (i = 0; i < 3; i++)
{
switch (etype[i])
{
case 'x':
case 'X':
t = EULER_AXIS_X;
break;
case 'y':
case 'Y':
t = EULER_AXIS_Y;
break;
case 'z':
case 'Z':
t = EULER_AXIS_Z;
break;
}
switch (i)
{
case 0:
bufeulertype.phi = t;
break;
case 1:
bufeulertype.theta = t;
break;
case 2:
bufeulertype.psi = t;
break;
}
}
}
int
get_point(double *lng, double *lat)
{
if (spheretype == STYPE_POINT)
{
*lng = bufpoints.p[0].lng;
*lat = bufpoints.p[0].lat;
return 1;
}
else
{
return 0;
}
}
int
get_line(double *phi, double *theta,
double *psi, unsigned char *etype, double *length)
{
int i;
if (spheretype != STYPE_LINE)
{
return 0;
}
*phi = bufangle[bufeuler[0]];
*theta = bufangle[bufeuler[1]];
*psi = bufangle[bufeuler[2]];
for (i = 0; i < 3; i++)
{
switch (i)
{
case 0:
etype[i] = bufeulertype.phi;
break;
case 1:
etype[i] = bufeulertype.theta;
break;
case 2:
etype[i] = bufeulertype.psi;
break;
}
}
*length = bufangle[bufline];
return 1;
}
int
get_euler(double *phi, double *theta,
double *psi, unsigned char *etype)
{
int i;
if (spheretype != STYPE_EULER)
{
return 0;
}
*phi = bufangle[bufeuler[0]];
*theta = bufangle[bufeuler[1]];
*psi = bufangle[bufeuler[2]];
for (i = 0; i < 3; i++)
{
switch (i)
{
case 0:
etype[i] = bufeulertype.phi;
break;
case 1:
etype[i] = bufeulertype.theta;
break;
case 2:
etype[i] = bufeulertype.psi;
break;
}
}
return 1;
}
int
get_circle(double *lng, double *lat, double *radius)
{
if (spheretype == STYPE_CIRCLE)
{
*lng = bufpoints.p[bufcircle[0]].lng;
*lat = bufpoints.p[bufcircle[0]].lat;
*radius = bufangle[bufcircle[1]];
return 1;
}
else
{
return 0;
}
}
int
get_ellipse(double *lng, double *lat,
double *r1, double *r2, double *inc)
{
if (spheretype == STYPE_ELLIPSE)
{
*lng = bufpoints.p[bufellipse[2]].lng;
*lat = bufpoints.p[bufellipse[2]].lat;
*r1 = bufangle[bufellipse[0]];
*r2 = bufangle[bufellipse[1]];
*inc = bufangle[bufellipse[3]];
return 1;
}
else
{
return 0;
}
}
int
get_path_count(void)
{
return (bufspos);
}
int
get_path_elem(int spos, double *lng, double *lat)
{
if (spheretype == STYPE_PATH)
{
*lng = bufpoints.p[spos].lng;
*lat = bufpoints.p[spos].lat;
return 1;
}
else
{
return 0;
}
}
int
get_box(double *lng1, double *lat1, double *lng2, double *lat2)
{
if (spheretype == STYPE_BOX)
{
*lng1 = bufpoints.p[0].lng;
*lat1 = bufpoints.p[0].lat;
*lng2 = bufpoints.p[1].lng;
*lat2 = bufpoints.p[1].lat;
return 1;
}
return 0;
}
int
get_buffer(char *buf, int offset)
{
int slen = strlen(parse_buffer);
if (!parse_buffer || !(slen > 0))
{
return 0;
}
if (slen >= offset)
{
slen = offset;
}
memcpy((void *) buf, (void *) parse_buffer, slen);
parse_buffer += slen;
return slen;
}
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