Nohiya Dev

Game AI Algorithms

#include <time.h>

typedef struct {
    double x, speed;
} NPC;

void update(NPC *npc, double target, double dt) {
    double distance = target - npc->x;
    double step = npc->speed * dt;

    if (distance > step)       npc->x += step;
    else if (distance < -step) npc->x -= step;
    else                      npc->x = target;
}

double seconds(void) {
    struct timespec t;
    timespec_get(&t, TIME_UTC);
    return (double)t.tv_sec + t.tv_nsec / 1e9;
}

int main(void) {
    NPC npc = {0, 2};             // Position 0; speed 2 units/second.
    double target = 10;
    double previous = seconds();
    int running = 1;

    while (running) {
        double now = seconds();
        double dt = now - previous;
        previous = now;

        // Read input; set running = 0 to quit.
        update(&npc, target, dt);
        // Draw the game.
    }

    return 0;
}

const npc = { x: 0, speed: 2 };

function update(npc, target, dt) {
  const distance = target - npc.x;
  const step = npc.speed * dt;

  if (distance > step) npc.x += step;
  else if (distance < -step) npc.x -= step;
  else npc.x = target;
}

const target = 10;
let previous = performance.now();
let running = true;

function loop(now) {
  if (!running) return;

  const dt = (now - previous) / 1000;
  previous = now;

  // Read input; set running = false to quit.
  update(npc, target, dt);
  // Draw the game.

  requestAnimationFrame(loop);
}

requestAnimationFrame(loop);

import std/[monotimes, os]

type NPC = object
  x, speed: float

proc update(npc: var NPC, target, dt: float) =
  let distance = target - npc.x
  let step = npc.speed * dt

  if distance > step: npc.x += step
  elif distance < -step: npc.x -= step
  else: npc.x = target

var npc = NPC(x: 0, speed: 2)
let target = 10.0
var previous = getMonoTime()
var running = true

while running:
  let now = getMonoTime()
  let dt = float(now.ticks - previous.ticks) / 1_000_000_000.0
  previous = now

  # Read input; set running = false to quit.
  update(npc, target, dt)
  # Draw the game.
  sleep(1)

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