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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Qareer Group Elevator Test</title>
</head>
<body>
<div id='view'></div>
<script src="jquery-2.1.3.min.js"></script>
<script>
var Elevator = function(properties) {
if(!properties) {
properties = {};
}
if(!Elevator.max_id) {
Elevator.max_id = 1;
}
Elevator.DIRECTION_DOWN = 1;
Elevator.DIRECTION_UP = 2;
Elevator.DIRECTION_STAY = 3;
this.id = Elevator.max_id++;
this.max_num_people = properties.max_num_people ? properties.max_num_people : Config.elevator_capacity;
this.speed_m_per_s = properties.speed_m_per_s ? properties.speed_m_per_s : Config.elevator_speed_m_per_s;
this.wait_time_s = properties.wait_time_s ? properties.wait_time_s : Config.elevator_wait_time_s;
this.need_to_wait_s = 0;
this.height = Config.elevator_height_m;
this.people = [];
this.destination_floor = 1;
};
Elevator.prototype.get_people = function() {
return this.people;
};
Elevator.prototype.get_available_space = function() {
return this.max_num_people - this.people.length;
};
Elevator.prototype.add_person = function(person) {
if(this.people.length >= this.max_num_people) {
return false;
}
for(var i = 0;i < this.people.length;i++) {
if(this.people[i] == person) {
return false;
}
}
this.people.push(person);
return true;
};
Elevator.prototype.remove_person = function(person) {
for(var i = 0;i < this.people.length;i++) {
if(this.people[i] == person) {
this.people.splice(i,1);
return true;
}
}
return false;
};
Elevator.prototype.get_height = function() {
return this.height;
};
Elevator.prototype.get_destination_floor = function() {
return this.destination_floor;
};
Elevator.prototype.at_floor = function() {
if(this.get_position() % this.get_height() == 0) {
return Math.floor(this.get_position() / this.get_height()) + 1;
}
return undefined;
};
Elevator.prototype.commit_decision = function(floor) {
this.destination_floor = floor;
return floor;
};
Elevator.prototype.decide = function() {
var simulator = Simulator.get_instance();
var building = simulator.get_building();
console_log('elevator id#' + this.id + ' deciding ' + this.destination_floor);
return this.commit_decision(Math.floor((Math.random() * building.get_num_floors())) + 1);
};
var Building = function() {
var num_floors = Config.num_floors;
var elevator_system = new Elevator_system();
Building.prototype.get_num_floors = function() {
return num_floors;
};
Building.prototype.get_elevator_system = function() {
return elevator_system;
};
};
var Elevator_system = function() {
var num_elevators = Config.num_elevators;
var elevators = [];
for(var i = 0;i < num_elevators;i++) {
elevators.push(new Elevator());
}
Elevator_system.prototype.get_elevators = function() {
return elevators;
};
Elevator_system.prototype.get_num_elevators = function() {
return num_elevators;
};
};
var Person = function(properties) {
this.at_floor = properties.at_floor;
this.destination_floor = properties.destination_floor;
var wait_time_in_elevator = 0;
this.get_wait_time_in_elevator = function() {
return wait_time_in_elevator;
};
var wait_time_out_elevator = 0;
this.get_wait_time_out_elevator = function() {
return wait_time_out_elevator;
};
this.do_get_on = function(elevator_direction) {
return true;
};
};
Person.prototype.get_direction = function() {
return this.at_floor > this.destination_floor ? Elevator.DIRECTION_DOWN : Elevator.DIRECTION_UP;
};
Person.prototype.get_floor = function() {
return this.at_floor;
};
Person.prototype.get_destination_floor = function() {
return this.destination_floor;
};
Person.prototype.wait_in_elevator = function() {
return ++this.wait_time_in_elevator;
};
Person.prototype.wait_out_elevator = function() {
return ++this.wait_time_out_elevator;
};
var Simulator = (function() {
var instance;
var stats = {
total_people_wait_time_in_elevator:0,
total_people_wait_time_out_elevator:0,
total_delivered_people:0,
total_elevator_traveled_distance:0
};
var building;
var requests = [];
var time_counter = 0;
var elevator_positions = [];
var people = [];
var people_by_floor = {};
var people_got_off_by_floor = {};
var end_simulation_callback;
var Simulator_object = function(properties) {
var graphic = properties.graphic;
Simulator_object.prototype.reset = function() {
stats.total_people_wait_time_in_elevator = 0;
stats.total_people_wait_time_out_elevator = 0;
stats.total_delivered_people = 0;
stats.total_elevator_traveled_distance = 0;
building = new Building();
};
Simulator_object.prototype.get_stats = function() {
return stats;
}
var add_person = function(person) {
people.push(person);
if(!people_by_floor['f' + person.at_floor]) {
people_by_floor['f' + person.at_floor] = [];
}
people_by_floor['f' + person.at_floor].push(person);
};
var remove_person = function(person) {
var found1 = false;
for(var i = 0;i < people.length;i++) {
if(people[i] == person) {
people.splice(i,1);
found1 = true;
break;
}
}
var found2 = false;
for(var i = 0;i < people_by_floor['f' + person.at_floor].length;i++) {
if(people_by_floor['f' + person.at_floor][i] == person) {
people_by_floor['f' + person.at_floor][i].splice(i,1);
found2 = true;
break;
}
}
return found1 && found2;
};
var get_people_at_floor = function(floor) {
return people_by_floor['f' + floor];
};
var clear_people_got_off = function(floor) {
people_got_off_by_floor['f' + floor] = [];
};
var add_person_got_off = function(person) {
if(!people_got_off_by_floor['f' + person.get_destination_floor()]) {
people_got_off_by_floor['f' + person.get_destination_floor()] = [];
}
people_got_off_by_floor['f' + person.get_destination_floor()].push(person);
};
var iterate = function() {
console_log('time:' + time_counter);
var elevator_system = building.get_elevator_system();
var elevators = elevator_system.get_elevators();
if(time_counter > Config.simulation_time) {
clearInterval(timer_id);
end_simulation_callback();
return;
}
for(var i = 0;i < building.get_num_floors();i++) {
var people_at_floor = get_people_at_floor(i + 1);
if(people_at_floor && people_at_floor.length > 0) {
for(var j = 0;j < people_at_floor.length;j++) {
people_at_floor[j].wait_out_elevator();
stats.total_people_wait_time_out_elevator++;
}
}
}
if(time_counter > Config.start_delay_s) {
if(Math.random() < Config.person_spawn_rate) {
var person_at_floor = Math.floor(Math.random() * building.get_num_floors()) + 1;
var person_direction = Elevator.DIRECTION_UP;
if(person_at_floor == building.get_num_floors() || (Math.random() < .5 && person_at_floor != 1)) {
person_direction = Elevator.DIRECTION_DOWN;
}
if(person_direction == Elevator.DIRECTION_UP) {
person_destination_floor = Math.floor((Math.random() * (building.get_num_floors() - person_at_floor - 1)) + (person_at_floor + 1));
} else {
person_destination_floor = Math.floor((Math.random() * (person_at_floor - 1))) + 1;
}
var person = new Person({
at_floor:person_at_floor,
destination_floor:person_destination_floor
});
add_person(person);
if(requests.indexOf(person.at_floor) == -1) {
requests.push(person.at_floor);
}
}
}
for(var i = 0;i < elevators.length;i++) {
var elevator = elevators[i];
var elevator_direction;
if(elevator.get_position() == ((elevator.get_destination_floor() - 1) * elevator.get_height())) {
elevator_direction = Elevator.DIRECTION_STAY;
} else if(elevator.get_position() < ((elevator.get_destination_floor() - 1) * elevator.get_height())) {
elevator_direction = Elevator.DIRECTION_UP;
} else if(elevator.get_position() > ((elevator.get_destination_floor() - 1) * elevator.get_height())) {
elevator_direction = Elevator.DIRECTION_DOWN;
}
var elevator_people = elevator.get_people();
for(var j = 0;j < elevator_people.length;j++) {
elevator_people[j].wait_in_elevator();
stats.total_people_wait_time_in_elevator++;
}
if(elevator.need_to_wait_s > 0) {
console_log('action elevator #' + i + ':wait');
if(elevator.at_floor()) {
var temp_spliced = [];
for(var j = 0;j < elevator_people.length;j++) {
if(elevator_people[j].get_destination_floor() == elevator.at_floor()) {
var spliced = elevator_people.splice(j,1);
if(spliced.length > 0) {
temp_spliced.push(spliced[0]);
}
j--;
}
}
if(temp_spliced.length > 0) {
clear_people_got_off(elevator.at_floor());
for(var j = 0;j < temp_spliced.length;j++) {
add_person_got_off(temp_spliced[j]);
stats.total_delivered_people++;
}
}
var people_at_floor = get_people_at_floor(elevator.at_floor());
if(people_at_floor && people_at_floor.length > 0) {
for(var j = 0;j < people_at_floor.length;j++) {
if(elevator.get_available_space() <= 0) {
break;
}
if(people_at_floor[j].do_get_on(elevator_direction)) {
var spliced = people_at_floor.splice(j,1);
if(spliced.length > 0) {
elevator.add_person(spliced[0]);
}
j--;
}
}
for(var j = 0;j < requests.length;j++) {
if(requests[j] == elevator.at_floor()) {
requests.splice(j,1);
break;
}
}
}
}
elevator.need_to_wait_s--;
if(elevator.need_to_wait_s == 0) {
elevator.decide();
}
} else {
if(elevator_direction == Elevator.DIRECTION_STAY) {
elevator.need_to_wait_s = elevator.wait_time_s;
console_log('action elevator #' + i + ':towait');
} else if(elevator_direction == Elevator.DIRECTION_UP) {
console_log('action elevator #' + i + ':up');
elevator_positions[i] += elevator.speed_m_per_s;
stats.total_elevator_traveled_distance += elevator.speed_m_per_s;
} else if(elevator_direction == Elevator.DIRECTION_DOWN) {
console_log('action elevator #' + i + ':down');
elevator_positions[i] -= elevator.speed_m_per_s;
stats.total_elevator_traveled_distance += elevator.speed_m_per_s;
}
}
}
graphic.draw(building,elevators,people_by_floor,people_got_off_by_floor,requests);
time_counter++;
};
Simulator_object.prototype.get_time_counter = function() {
return time_counter;
};
Simulator_object.prototype.get_requests = function() {
return requests;
};
Simulator_object.prototype.get_building = function() {
return building;
};
var INTERVAL_DELAY_MS = Config.simulation_delay_ms;
var timer_id;
Simulator_object.prototype.start = function(_end_simulation_callback) {
var elevator_system = building.get_elevator_system();
elevator_system.get_requests = function() {
return requests;
};
var elevators = elevator_system.get_elevators();
for(var i = 0;i < elevators.length;i++) {
elevator_positions[i] = 0;
elevators[i].get_position = (function(i) {
return function() {
return elevator_positions[i];
};
})(i);
}
end_simulation_callback = _end_simulation_callback;
time_counter = 0;
timer_id = setInterval(iterate,INTERVAL_DELAY_MS);
graphic.draw(building,elevators,people_by_floor,people_got_off_by_floor,requests);
};
};
return {
get_instance:function(properties) {
if(!instance) {
instance = new Simulator_object(properties);
}
return instance;
}
};
})();
var Graphic = (function() {
var instance;
var canvas;
var context;
var padding = 20;
var Graphic_object = function(properties) {
this.view_element = properties.view_element;
canvas = $('<canvas>').css({float:'left'});
$(this.view_element).append(canvas.attr({width:Config.canvas_width,height:Config.canvas_height}));
canvas = canvas.get(0);
context = canvas.getContext('2d');
};
Graphic_object.prototype.draw = function(building,elevators,people_by_floor,people_got_off_by_floor,requests) {
context.clearRect(0, 0, canvas.width, canvas.height);
var num_floors = building.get_num_floors();
var elevator_system = building.get_elevator_system();
var elevators = elevator_system.get_elevators();
var elevator_height_px = Config.scale_m_px * Config.elevator_height_m;
var building_width_px = (Config.elevator_width_px + (2 * Config.elevator_gap_px)) * elevators.length;
var building_height_px = elevator_height_px * num_floors;
context.fillStyle = "#ccc";
context.fillRect(padding, padding, building_width_px, building_height_px);
var font_size = (Config.elevator_height_m * Config.scale_m_px * .8);
context.fillStyle = "#000";
context.font = font_size + "px Calibri";
context.fillText(
'Queue: ' + JSON.stringify(requests),
0,
font_size);
for(var i = 0;i < num_floors - 1;i++) {
var y = padding + (i + 1) * Config.elevator_height_m * Config.scale_m_px;
context.beginPath();
context.moveTo(padding, y);
context.lineTo(padding + building_width_px, y);
context.strokeStyle = "#888";
context.stroke();
}
for(var i = 0;i < elevators.length;i++) {
var elevator = elevators[i];
console_log('elevator #' + i + ' ' + JSON.stringify({at_floor:elevators[i].at_floor(),position:elevators[i].get_position(),destination_floor:elevators[i].get_destination_floor()}));
context.fillStyle = "#666";
context.fillRect(
padding + i * (Config.elevator_width_px + 2 * Config.elevator_gap_px) + Config.elevator_gap_px,
padding + building_height_px - Config.scale_m_px * elevator.get_position() - elevator_height_px,
Config.elevator_width_px,
elevator_height_px);
context.fillStyle = "#000";
context.font = font_size + "px Calibri";
context.fillText(
zero_pad(elevator.get_destination_floor(),(num_floors + '').length),
padding + i * (Config.elevator_width_px + 2 * Config.elevator_gap_px) + Config.elevator_gap_px + 1,
padding + building_height_px - Config.scale_m_px * elevator.get_position() - elevator_height_px - 2);
context.fillStyle = "#fff";
context.fillText(
zero_pad(elevator.get_people().length,(num_floors + '').length),
padding + i * (Config.elevator_width_px + 2 * Config.elevator_gap_px) + Config.elevator_gap_px + 1,
padding + building_height_px - Config.scale_m_px * elevator.get_position() - elevator_height_px + font_size);
}
var person_height_px = Math.floor(elevator_height_px * .8);
for(var i = 0;i < num_floors;i++) {
var y = padding + building_height_px - i * Config.elevator_height_m * Config.scale_m_px - 2;
context.fillStyle = "#000";
context.font = (Config.elevator_height_m * Config.scale_m_px * .8) + "px Calibri";
context.fillText(zero_pad(i + 1,(num_floors + '').length),0,y);
if(people_by_floor['f' + (i + 1)] && people_by_floor['f' + (i + 1)].length > 0) {
for(var j = 0;j < people_by_floor['f' + (i + 1)].length;j++) {
context.fillStyle = "#000";
context.fillRect(
2 * padding + building_width_px + j * (Config.person_width_px + Config.person_gap_px),
padding + building_height_px - i * elevator_height_px - person_height_px,
Config.person_width_px,
person_height_px);
}
}
if(people_got_off_by_floor['f' + (i + 1)] && people_got_off_by_floor['f' + (i + 1)].length > 0) {
var x_offset = 2 * padding + building_width_px + (people_by_floor['f' + (i + 1)] ? people_by_floor['f' + (i + 1)].length : 0) * (Config.person_width_px + Config.person_gap_px);
for(var j = 0;j < people_got_off_by_floor['f' + (i + 1)].length;j++) {
context.fillStyle = "#5cb85c";
context.fillRect(
x_offset + j * (Config.person_width_px + Config.person_gap_px),
padding + building_height_px - i * elevator_height_px - person_height_px,
Config.person_width_px,
person_height_px);
}
}
}
};
return {
get_instance:function(properties) {
if(!instance) {
instance = new Graphic_object(properties);
}
return instance;
}
};
})();
var zero_pad = function(n,N) {
var string = n + '';
var num_zeros = N - (string).length;
for(var j = 0;j < num_zeros;j++) {
string = '0' + string;
}
return string;
};
var console_log = function(s) {
if(Config.debug) {
console.log(s);
}
};
var Config = {
debug:false,
num_floors:30,
num_elevators:4,
elevator_height_m:2,
start_delay_s:60,
elevator_capacity:20, // or only 1 very fat one =)
// a fast elevator can reach 40 feet per minute which translates to .2 meter per second
// http://www.businessinsider.com/the-8-fastest-elevators-in-the-world-2013-1?IR=T&op=1
elevator_speed_m_per_s:1, // by default, this is elevator is a slow one
elevator_wait_time_s:5,
simulation_time:1000,
canvas_width:500,
canvas_height:500,
elevator_width_px:12,
scale_m_px:6,
elevator_gap_px:2,
simulation_delay_ms:10,
person_width_px:4,
person_gap_px:2,
person_spawn_rate:.2
};
</script>
<script src="myelevator.js"></script>
<script>
var simulator = Simulator.get_instance({graphic:Graphic.get_instance({view_element:$('#view')})});
simulator.reset();
console_log('stats:' + JSON.stringify(simulator.get_stats()));
simulator.start(function() {
console_log('stats:' + JSON.stringify(simulator.get_stats()));
if(!$('#stats').get() || $('#stats').get().length == 0) {
$('#view').append($('<pre>').attr({id:'stats'}).css({float:'left'}));
}
$('#stats').text(JSON.stringify(simulator.get_stats(),null,' '));
});
</script>
</body>
</html>