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/*
* Explosion entity velocity and damage calculator.
*
* @1.17.1
*
*/
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <math.h>
struct vec3d {
double x;
double y;
double z;
};
static int vec3d_parse(char *in, struct vec3d *out)
{
int i = 0;
char *p = strtok(in, ",");
while (p != NULL)
{
double *ptr;
switch (i ++)
{
case 0:
ptr = &out->x;
break;
case 1:
ptr = &out->y;
break;
case 2:
ptr = &out->z;
break;
default:
assert(0);
break;
}
sscanf(p, "%lf", ptr);
p = strtok(NULL, ",");
}
if (i != 3)
{
fprintf(stderr, "Invalid Vec3D: %s. Example: -1,1,1.\n", in);
return 64;
}
return 0;
}
int main(int argc, char **argv)
{
struct vec3d tnt = { 0.0, 0.0, 0.0 };
struct vec3d entity = { 0.0, 0.0, 0.0 };
struct vec3d velocity = { 0.0, 0.0, 0.0 };
double entity_eye_y = 0.0;
int is_tnt = 1;
double power = 4.0;
double exposure = 1.0;
if (argc <= 1)
{
goto usage;
usage:
fprintf(stderr, "Usage: %s -t 0,0,0 -e 0,0,0 [-v 0,0,0]\n"
"\n"
"Options:\n"
"\t-t vec3d\tTNT entity coords [Mandatory]\n"
"\t-e vec3d\tTarget entity coords [Mandatory]\n"
"\t-p double\tExplosion power [Optional, defaults to 4.0 (TNT)]\n"
"\t-ey vec3d\tTarget entity eye Y [Optional if the target is a TNT]\n"
"\t-v vec3d\tTarget entity initial velocity [Optional, defaults to 0,0,0]\n"
"\t-x double\tExposure of explosion. Percentage. 1.0 if no blocks blocking the ray. [Optional, defaults to 1.0]\n"
"\t-h\t\tPrint usage to stderr\n"
"\n"
"Vec3D Format: x,y,z. No spaces or brackets allowed.\n", argv[0]);
return 64;
}
int r = 0;
for (int i = 1; i < argc; i ++)
{
const char *arg = argv[i];
if (!strcmp("-h", arg)) goto usage;
if (i == argc - 1)
{
fprintf(stderr, "%s requires an argument.\n", arg);
goto usage;
}
char *val = argv[++i];
if (!strcmp("-t", arg)) { if ((r = vec3d_parse(val, &tnt))) return r; }
else if (!strcmp("-e", arg)) { if ((r = vec3d_parse(val, &entity))) return r; }
else if (!strcmp("-v", arg)) { if ((r = vec3d_parse(val, &velocity))) return r; }
else if (!strcmp("-ey", arg))
{
sscanf(val, "%lf", &entity_eye_y);
is_tnt = 0;
}
else if (!strcmp("-p", arg)) sscanf(val, "%lf", &power);
else if (!strcmp("-x", arg))
{
sscanf(val, "%lf", &exposure);
if (exposure < 0.0 || exposure > 1.0)
{
fprintf(stderr, "Invalid exposure: [0.0, 1.0]\n");
goto usage;
}
}
else
{
fprintf(stderr, "Unknown argument: %s\n", arg);
goto usage;
}
}
fprintf(stderr, "(%.5f, %.5f, %.5f) -> %.2f -> %c(%.5f, %.5f, %.5f)\n",
tnt.x,
tnt.y,
tnt.z,
power,
is_tnt ? 'T' : 'E',
entity.x,
entity.y,
entity.z);
fprintf(stderr, "WARNING: Explosion range bounding box is ignored. In reality, if the target entity is too far from the explosion center, it will not be affected. We will support that later.\n");
double power2 = 2.0 * power;
double xx = entity.x - tnt.x;
double zz = entity.z - tnt.z;
double yy = (is_tnt ? entity.y : entity_eye_y) - tnt.y;
double dist = sqrt(xx * xx + (entity.y - tnt.y) * (entity.y - tnt.y) + zz * zz);
fprintf(stderr, "Square distance: %.5f\n", dist);
fprintf(stderr, "WARNING: Explosion immunity is ignored. In reality, if the target entity is immune to explosion, it will not be affected at all.\n");
if (dist / power2 > 1)
{
printf("Not affected, to too far. (Square distance = %.5f).\n", dist);
return 1;
}
fprintf(stderr, "Delta distance: %.5f, %.5f, %.5f\n", xx, yy, zz);
double dist_eye_y = sqrt(xx * xx + yy * yy + zz * zz);
if (dist_eye_y == 0)
{
printf("Not affected due to dist_eye_y == 0.\n");
return 1;
}
xx /= dist_eye_y;
yy /= dist_eye_y;
zz /= dist_eye_y;
fprintf(stderr, "Delta distance final: %.5f, %.5f, %.5f\n", xx, yy, zz);
double accel = (1.0 - (dist / power2)) * exposure;
printf("ACCELERATION=%.5f\n", accel);
int damage = (int) ((accel * accel + accel) / 2.0 * 7.0 * power2 + 1.0);
printf("DAMAGE=%d\n", damage);
fprintf(stderr, "WARNING: Explosion protection is ignored. In reality, if the entity has that protection, the final acceleration may be altered.\n");
struct vec3d delta_v = {
xx * accel,
yy * accel,
zz * accel
};
printf("DELTA_VELOCITY=\"%.5f,%.5f,%.5f\"\n", delta_v.x, delta_v.y, delta_v.z);
velocity.x += delta_v.x;
velocity.y += delta_v.y;
velocity.z += delta_v.z;
printf("FINAL_VELOCITY=\"%.5f,%.5f,%.5f\"\n", velocity.x, velocity.y, velocity.z);
return 0;
}
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