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#include "libs/lr/lr.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#define MemoryCopy memcpy
#include "listing_065.cpp"
#include "haversine_random.h"
enum generation_method : u32
{
Method_Uniform,
Method_Cluster
};
int main(int ArgsCount, char *Args[], char *Env[])
{
// 1. haversine_generator [uniform/cluster] [random seed] [number of pairs to generate]
if(ArgsCount >= 4)
{
u32 Method = 0;
u64 RandomSeed = 0;;
u64 PairsCount = 0;
b32 Error = false;
if(!strcmp(Args[1], "uniform"))
{
Method = Method_Uniform;
}
else if(!strcmp(Args[1], "cluster"))
{
Method = Method_Cluster;
}
else
{
Error = true;
}
RandomSeed = atoll(Args[2]);
if(RandomSeed == 0)
{
if(Args[2][0] == '0')
{
RandomSeed = 0;
}
else
{
Error = true;
}
}
PairsCount = atoll(Args[3]);
if(PairsCount == 0)
{
Error = true;
}
if(!Error)
{
printf("Method: %s\n"
"Random seed: %lu\n"
"Pairs count: %lu\n"
, Args[1], RandomSeed, PairsCount);
// Generate pairs in the following format.
//
// {
// "pairs":
// [
// { "x0": ..., "y0": ..., "x1": ..., "y1": ... },
// { "x0": ..., "y0": ..., "x1": ..., "y1": ... }
// ]
// }
//
FILE *Out = fopen("out.json", "wb");
char *JsonHeader =
"{\n"
" \"pairs\":\n"
" [\n";
char *JsonFooter =
" ]\n"
"}\n";
fprintf(Out, "%s", JsonHeader);
pcg64_random_t RNG = {};
pcg64_srandom_r(&RNG, RandomSeed, RandomSeed);
f64 AverageSum = 0;
f64 TotalSum = 0;
for(u64 PairsIndex = 0;
PairsIndex < PairsCount;
PairsIndex++)
{
b32 LastPair = false;
f64 X0 = RandomBetween(&RNG, -180.0, 180.0);
f64 Y0 = RandomBetween(&RNG, -360.0, 360.0);
f64 X1 = RandomBetween(&RNG, -180.0, 180.0);
f64 Y1 = RandomBetween(&RNG, -360.0, 360.0);
f64 Sum = ReferenceHaversine(X0, Y0, X1, Y1, 6372.8);
TotalSum += Sum;
// NOTE(luca): A double's mantissa is 52 bits. 2^52 - 1 is 4503599627370495 which has
// 16 digits.
fprintf(Out,
" { \"x0\": %.15f, \"y0\": %.15f, \"x1\": %.15f, \"y1\": %.15f }\n",
X0, Y0, X1, Y1);
}
AverageSum = TotalSum / (f64)PairsCount;
fprintf(Out, "%s", JsonFooter);
printf("Average sum: %f\n", AverageSum);
}
else
{
printf("Usage: %s [uniform/cluster] [random seed] [number of pairs to generate]\n",
Args[0]);
}
}
else
{
printf("Usage: %s [uniform/cluster] [random seed] [number of pairs to generate]\n",
Args[0]);
}
return 0;
}
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