can you help me in my code.
i want to check if the gps location is within the polygon or not... and the location that i take from the gps module is within the polygon but the result of my code does not work correctly . the result say that the location is not in polygon ..
I'm sure that i have a mistake in the code but i can't see it
Thank You 
My Code:
#include <SoftwareSerial.h>
SoftwareSerial gpsSerial(10, 11); // RX, TX (TX not used)
int leda = 7;
int ledt = 12;
const int sentenceSize = 80;
String Data1="";
String Data2="";
String Data3="";
String Data4="";
String Data5="";
int crossings = 0;
char str0[20];
char str1[20];
char str2[20];
const int npoint=6;
float x[npoint]={351448.94, 351926.15, 351915.85, 351479.83, 350858.15, 350734.56};
float y[npoint]={323750.32, 323670.58, 323303.68, 323212.29, 323245.66,323663.33 };
char sentence[sentenceSize];
void setup()
{
Serial.begin(115200);
gpsSerial.begin(115200);
}
void loop()
{
static int i = 0;
if (gpsSerial.available())
{
char ch = gpsSerial.read();
if (ch != '\n' && i < sentenceSize)
{
sentence = ch;
- i++;*
- }*
- else*
- {*
_ sentence = '\0';_
* i = 0;*
* displayGPS();*
* }*
* }*
}
void displayGPS()
{
_ char field[20],**end1;;_
* getField(field, 0);*
* if (strcmp(field, "$GPRMC") == 0)*
* {*
* Serial.print("Lat: ");*
* getField(field, 3); // number*
* double f1,f,ff,ffw;*
* // f= atof(field);*
* //double num;*
* f = strtod( field, end1 ); // to double*
* ff=f/100.0000;*
* //Serial.println(f);*
* f1=ff-32;*
_ ffw=f1100;_
_ dtostrf(ffw,6,6,str0);_
_ Data1=str0;_
_ float minit,minitm;_
_ minit=(atoi(str0));_
_ //Serial.println(minit);_
_ minitm=minit/60;_
_ //Serial.println(minitm);_
_ double sec;_
_ sec=f-3200-minit;_
_ sec=sec60;
* //Serial.println(sec);*
* sec=sec/36;*
* //Serial.println(sec);*
* double lat;*
lat=3200+(minitm100)+sec;_
_ lat=lat/100.0;_
_ dtostrf(lat,6,6,str0);_
_ Data1=str0;_
_ Serial.print(Data1);_
_ /////*_
* //////*
_ lat=lat10000;_
_ dtostrf(lat,6,6,str0);_
_ // Serial.print(str0);*_
* getField(field, 4); // N/S*
* Serial.print(field);*
* Data2=field;*
* Serial.print(" Long: ");*
* getField(field, 5); // number*
* f = strtod( field, end1 ); // to double*
* ff=f/100.0000;*
* //Serial.println(f);*
* f1=ff-35;*
_ ffw=f1100;_
_ dtostrf(ffw,6,6,str0);_
_ Data1=str0;_
_ // float minit,minitm;_
_ minit=(atoi(str0));_
_ //Serial.println(minit);_
_ minitm=minit/60;_
_ //Serial.println(minitm);_
_ //double sec;_
_ sec=f-3500-minit;_
_ sec=sec60;
* //Serial.println(sec);*
* sec=sec/36;*
* //Serial.println(sec);*
double Long;
Long=3500+(minitm100)+sec;_
_ Long=Long/100.0;_
_ dtostrf(Long,6,6,str1);_
_ //Serial.print(str1);_
_ Data1=str1;_
_ Serial.print(Data1);_
_ Long=Long10000;_
* dtostrf(Long,6,6,str1);*
* // Serial.print(str1);*
* getField(field, 6); // E/W*
Serial.print(field);
* Data4=field;*
if(inpoly(atof(str1),atof(str0))==1) {
* Serial.println("in polygon ");*
* delay (5000);*
* }*
* else if (inpoly(atof(str1),atof(str0))==2)*
* {*
* Serial.println("out of polygon ");*
* delay (5000);*
* }*
* }*
}
int inpoly(float px, float py)
{
* int i, j, c = 0;*
* for (i = 0, j = npoint-1; i < npoint; j = i++) {*
_ if ( ((y*>py) != (y[j]>py)) &&
(px < (x[j]-x) * (py-y) / (y[j]-y) + x) ){
c = 1;*_
* }*
* else {*
* c=2;*
* }}*
return c;
}
void getField(char* buffer, int index)
{
* int sentencePos = 0;*
* int fieldPos = 0;*
* int commaCount = 0;*
* while (sentencePos < sentenceSize)*
* {*
* if (sentence[sentencePos] == ',')*
* {*
* commaCount ++;*
* sentencePos ++;*
* }*
* if (commaCount == index)*
* {*
* buffer[fieldPos] = sentence[sentencePos];*
* fieldPos ++;*
* }*
* sentencePos ++;*
* }*
* buffer[fieldPos] = '\0';*
}