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Back on Ruins I was attempting to make a baddie system. At the time I saved it to use/finish in the future but I doubt I'll get a chance to. The only thing missing are wall/water checks because I was having trouble with them, as well as dealing damage, taking damage, and healing since we didn't have a health or damage system on Ruins. Enjoy an almost complete baddie system.

Core:

PHP Code:

/*
  This is the core system of baddies.
  No scripts but those that are a baddie class
  should be linking to this.
  -Switch
*/

/*
  this.bname -> baddie name
  this.range
   [0] -> aggro
   [1] -> attack
  this.speed
  this.damage
  this.freeze -> freeze time after an attack
  this.health
   [0] -> current
   [1] -> max
*/

enum {
  IDLE,
  WALK,
  ATTACK,
  DEAD
}

function onCreated() {
  cancelEvents("PlayerAggro");
  this.spawn_coords = {this.level.name, this.x, this.y};
  this.mode = IDLE;
  this.showCharacter();
  this.dir = 2;
  this.nick = this.bname;
  setCharAni("baddie_" @lowercase(this.bname)@ "-idle", null);
  
  if (findNearestPlayer(this.x, this.y) != null) {
    //begin loop
    onTimeout();
  }
}

function onPlayerEnters() {
  if (this.mode == IDLE) {
    //begin loop
    onTimeout();
  }
}
function onTimeout() {  
  temp.pl = findNearestPlayer(this.x, this.y);
  temp.dx = temp.pl.x-this.x;
  temp.dy = temp.pl.y-this.y;
  temp.dist = (temp.dx^2+temp.dy^2)^0.5;
  if (temp.dist <= this.range[0]) {
    this.dcount = 0;
    this.mode = ATTACK;
    onPlayerAggro(temp.pl);
    return;
  }

  if (this.dcount == 20) {
    temp.rand = int(random(0, 100));
    if (temp.rand in |0, 80|) {
      this.mode = IDLE;
    }
    else if (temp.rand in |81, 100|) {
      this.mode = WALK;
    }
  }
  if (this.mode == IDLE) {
    setCharAni("baddie_" @lowercase(this.bname)@ "-idle", null);
    if (this.dcount == 20) {
      this.dcount = 0;
      this.dir = int(random(0, 3));
    }
  }
  else if (this.mode == WALK) {
    setCharAni("baddie_" @lowercase(this.bname)@ "-walk", null);
    if (this.dcount == 20) {
      this.dcount = 0;
      for (temp.i=0; temp.i<359; temp.i++) {
        temp.angle = random(0, pi*2);
        temp.dx = cos(temp.angle)*this.speed*20;
        temp.dy = -sin(temp.angle)*this.speed*20;
        if (this.x+temp.dx in |0, 64| && this.y+temp.dy in |0, 64|) {
          this.dir = (temp.angle in |0, pi*0.25|?3:(temp.angle in |pi*0.25, pi*0.75|?0:(temp.angle in |pi*0.75, pi*1.25|?1:(temp.angle in |pi*1.25, pi*1.75|?2:3))));
          move(temp.dx/20, temp.dy/20, 0.1, 0);
          this.wdx = temp.dx/20;
          this.wdy = temp.dy/20;
          break;
        }
      }
    }
    else {
      move(this.wdx, this.wdy, 0.1, 0);
    }
  }
  this.dcount++;
  setTimer(0.1);
}

function onPlayerAggro(pl) {
  if (this.mode != ATTACK) {
    //stop walk ani
    setCharAni("baddie_" @lowercase(this.bname)@ "-idle", null);
    onTimeout();
    return;
  }
  
  //get distance to player
  temp.dx = pl.x-this.x;
  temp.dy = pl.y-this.y;
  temp.dist = (temp.dx^2+temp.dy^2)^0.5;
  //in hurt range
  if (temp.dist <= this.range[1]) {
    //so that you can see the attack
    setCharAni("baddie_" @lowercase(this.bname)@ "-idle", null);
    attackPlayer(pl);
    return;
  }
  //out of aggro range (plus a quarter of it, to make it harder to get out of)
  if (temp.dist > this.range[0]*1.25) {
    //stop walk ani
    setCharAni("baddie_" @lowercase(this.bname)@ "-idle", null);
    onTimeout();
    return;
  }
  //walk
  setCharAni("baddie_" @lowercase(this.bname)@ "-walk", null);
  //return dx and dy to a distance of 1, then add in its speed
  temp.angle = getangle(temp.dx, temp.dy);
  temp.movex = cos(temp.angle)*this.speed*2;
  temp.movey = -sin(temp.angle)*this.speed*2;
  //change dir
  this.dir = (temp.angle in |0, pi*0.25|?3:(temp.angle in |pi*0.25, pi*0.75|?0:(temp.angle in |pi*0.75, pi*1.25|?1:(temp.angle in |pi*1.25, pi*1.75|?2:3))));
  //move baddie towards player
  move(temp.movex, temp.movey, 0.1, 0);
  
  scheduleEvent(0.1, "PlayerAggro", pl);
}
function attackPlayer(pl) {
  setCharAni("baddie_" @lowercase(this.bname)@ "-attack", null);
  //hurt stuff goes here
  scheduleEvent(1.5, "PlayerAggro", pl);
}

function onRespawn() {
  cancelEvents("PlayerAggro");
  setTimer(0);
  warpto(this.spawn_coords[0], this.spawn_coords[1], this.spawn_coords[2]);
  this.x = this.spawn_coords[1];
  this.y = this.spawn_coords[2];
  setCharAni("baddie_" @lowercase(this.bname)@ "-idle", null);
  this.mode = IDLE;
  if (findNearestPlayer(this.x, this.y) != null) {
    onTimeout();
  }
}

function onPlayerLeaves() {
  if (findNearestPlayer(this.x, this.y) == null) {
    this.mode = IDLE;
    //end loop
    setTimer(0);
    setCharAni("baddie_" @lowercase(this.bname)@ "-idle", null);
  }
} 


Baddie Class (example):

PHP Code:

/*
  This is an example of a baddie class that
  would link to the baddie core.
*/

function onCreated() {
  this.bname = "Slug";
  this.range = {5, 1};
  this.speed = 0.4;
  this.damage = 9001;
  this.freeze = 0.3;
  this.health = {9001, 9001};
  this.join("baddie-core");
}

// It's over 9000!!!!!!