GameMaker example for Aaron

example.gmx

/* State determination */
// --------------------------------
if(instance_exists(obj_player)) {
    
    // enemy sees player
    if(!collision_line(x,y,obj_player.x,obj_player.y,obj_wall,1,0)) {
        state_attacking = 1;
        state_pursuing = 1;
        state_doubt = 0;
        image_angle = point_direction(x,y,obj_player.x,obj_player.y);
    } 
    
    // enemy doesn't see player
    else {
    
        state_attacking = 0;
        
        // enemy doesn't see player but is pursuing
        if(state_pursuing) {
            state_doubt += 1;
            if(state_doubt > 100) { // ..enemy gives up after a bit
                state_pursuing = 0;
                state_doubt = 0;
            }
        }
    }
    
    // stop pursuing when enemy nears player
    if(distance_to_object(obj_player) < 150 && state_pursuing == 1) {
        state_pursuing = 0;
    }
    
/* Pathfinding/Behaviors */
// -------------------------------------------

// Pursue
if(state_pursuing==1) {
    if(mp_grid_path(global.enemy_grid, enemy_path, x, y, obj_player.x, obj_player.y, 1)) {
        image_speed = 1;
        path_set_precision(enemy_path,8);
        path_start(enemy_path,pursuit_speed,0,0);
    }

// Stop Pursuing
} else {
    image_speed = 0;
    path_end();
}

// Attack
if(state_attacking==1) {
    enemy_attack();
}
    
}

/* Destroy */
// --------------------------------
if(health_level<=0) {
    instance_destroy();
    obj_player.stats_score_total += 10;
}