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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include <stdarg.h>
#include <errno.h>
void err(int ex, const char *fmt, ...)
{
va_list list;
int e = errno;
va_start(list, fmt);
vfprintf(stderr, fmt, list);
fputs(": ", stderr);
fputs(strerror(e), stderr);
fputs("\n", stderr);
exit(ex);
}
void errx(int ex, const char *fmt, ...)
{
va_list list;
va_start(list, fmt);
vfprintf(stderr, fmt, list);
fputs("\n", stderr);
exit(ex);
}
typedef void (*colorfunc_t) (double x, double y, double dx, double dy, double *r, double *g, double *b);
double rnd()
{
return rand() / (RAND_MAX + 1.0);
}
double softclip(double x, double a)
{
// don't ask what this does - but it works
double cse = (2*a*x - x - a + 1) * x;
return cse / (cse + (1 - a));
}
void writepic(colorfunc_t f, const char *fn, int width, int height)
{
int x, y;
uint8_t tga[18];
FILE *file = fopen(fn, "wb");
if(!file)
err(1, "fopen >%s", fn);
memset(tga, 0, sizeof(tga));
tga[2] = 2; // uncompressed type
tga[12] = (width >> 0) & 0xFF;
tga[13] = (width >> 8) & 0xFF;
tga[14] = (height >> 0) & 0xFF;
tga[15] = (height >> 8) & 0xFF;
tga[16] = 24; // pixel size
if(fwrite(&tga, sizeof(tga), 1, file) != 1)
err(1, "fwrite >%s", fn);
//for(y = height-1; y >= 0; --y)
for(y = 0; y < height; ++y)
for(x = 0; x < width; ++x)
{
uint8_t rgb[3];
double rr, gg, bb;
double xx, yy;
xx = (x + 0.5) / width;
yy = (y + 0.5) / height;
f(xx, yy, 0.5 / width, 0.5 / height, &rr, &gg, &bb);
rgb[2] = floor(rnd() + rr * 255);
rgb[1] = floor(rnd() + gg * 255);
rgb[0] = floor(rnd() + bb * 255);
if(fwrite(rgb, sizeof(rgb), 1, file) != 1)
err(1, "fwrite >%s", fn);
}
fclose(file);
}
typedef struct
{
double x, y, dist;
int weapon;
}
plotpoint_t;
plotpoint_t *plotpoints;
size_t nPlotpoints, allocatedPlotpoints;
void readpoints(const char *fn)
{
char buf[1024];
FILE *infile = fopen(fn, "r");
if(!infile)
err(1, "fopen <%s", fn);
nPlotpoints = allocatedPlotpoints = 0;
plotpoints = NULL;
while(fgets(buf, sizeof(buf), infile))
{
if(*buf == '#')
{
fputs(buf + 1, stdout);
continue;
}
if(nPlotpoints >= allocatedPlotpoints)
{
if(allocatedPlotpoints == 0)
allocatedPlotpoints = 1024;
else
allocatedPlotpoints = nPlotpoints * 2;
plotpoints = (plotpoint_t *) realloc(plotpoints, allocatedPlotpoints * sizeof(*plotpoints));
}
if(sscanf(buf, "%lf %lf %lf %d", &plotpoints[nPlotpoints].x, &plotpoints[nPlotpoints].y, &plotpoints[nPlotpoints].dist, &plotpoints[nPlotpoints].weapon) != 4)
continue;
++nPlotpoints;
}
}
void calcplot1(double x, double y, double *out, double sigma2)
{
size_t i;
double dist2;
double val, totalval = 0, weight, totalweight = 0;
for(i = 0; i < nPlotpoints; ++i)
{
dist2 = (x - plotpoints[i].x) * (x - plotpoints[i].x) + (y - plotpoints[i].y) * (y - plotpoints[i].y);
weight = 1; // / plotpoints[i].dist;
val = exp(-dist2 / sigma2);
totalweight += weight;
totalval += weight * val;
}
*out = softclip(totalval / (totalweight * sqrt(sigma2 * 2 * M_PI)), 0.8);
}
void calcplotp(double x, double y, double dx, double dy, double *out)
{
size_t i;
double distx, disty;
for(i = 0; i < nPlotpoints; ++i)
{
distx = x - plotpoints[i].x;
disty = y - plotpoints[i].y;
if(distx < dx)
if(distx > -dx)
if(disty < dy)
if(disty > -dy)
{
*out = 1;
break;
}
}
}
void calcplot(double x, double y, double dx, double dy, double *r, double *g, double *b)
{
calcplot1(x, y, r, 1/64.0);
calcplot1(x, y, g, 1/512.0);
calcplot1(x, y, b, 1/4096.0);
calcplotp(x, y, dx, dy, b);
}
int main(int argc, char **argv)
{
if(argc != 3)
errx(1, "Usage: %s infile.plot outfile.tga", *argv);
readpoints(argv[1]);
writepic(calcplot, argv[2], 512, 512);
return 0;
}
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