eco2d/code/modules/source/system_demo.c

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#define DEMO_NPC_MOVE_SPEED 500
#define DEMO_NPC_STEER_SPEED 300
void DemoNPCMoveAround(ecs_iter_t *it) {
Velocity *v = ecs_column(it, Velocity, 1);
for (int i = 0; i < it->count; i++) {
float d = zpl_quake_rsqrt(v[i].x*v[i].x + v[i].y*v[i].y);
v[i].x += (v[i].x*d*DEMO_NPC_MOVE_SPEED*safe_dt(it) + zpl_cos(zpl_to_radians(rand()%360))*DEMO_NPC_STEER_SPEED*safe_dt(it));
v[i].y += (v[i].y*d*DEMO_NPC_MOVE_SPEED*safe_dt(it) + zpl_sin(zpl_to_radians(rand()%360))*DEMO_NPC_STEER_SPEED*safe_dt(it));
}
}