Project tutorial

Arduino - Web-Based Two-Player Game © GPL3+

Have fun with a colleague during break time with this web-based game.

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Components and supplies

About this project

I made a similar project using but simpler hardware (only PHPoC) here.

Demo

Data Flow

Arduino ---> PHPoC WiFi Shield ---> Web browser

There are two people playing game. each people uses two buttons to control direction of goalkeepers. Therefore, we need four buttons.

Arduino reads the states of four buttons, If any of them is changed, Arduino will re-calculated the moving direction of goalkeeper and send the direction values to PHPoC WiFi Shield. When receiving the values, PHPoC WiFi Shield send it to Web Browser via websocket. JavaScript function will update the moving direction of goalkeepers.

JavaScript program will continuously update position of ball, goalkeepers and obstacles based on their direction and check collision as well.

Direction of goalkeepers are changed based on the state of buttons.

Note that: PHPoC shield has a built-in program to pass data from Arduino to web browser. Therefore, we don't need to care about it.

What We Need to Do

  • Set WiFi information for PHPoC shield (SSID and password)
  • Upload new UI to PHPoC shield
  • Write Arduino code

Setting WiFi Information for PHPoC Shield

See this instruction.

Upload new Web UI to PHPoC Shield

  • Download PHPoC source code remote_game.php (on code section).

When receiving HTTP request from web browser, PHPoC Shield interprets PHP script in this file, and then send the interpreted file to web browser. The interpreted file (contains HTML, CSS and JavaScript code) provides UI (User Interface), updates position of ball, goalkeepers and obstacles based on their direction and checks collision as well. It also receives the moving direction of goalkeepers from websocket.

Write Arduino Code

  • Upload Arduino code (on code section) to Arduino

Testing

  • Click serial button on Arduino IDE to see the IP address.
  • Open web browser, type http:// replace_ip_address/remote_game.php
  • Click connect button and test it.

Schematics

Arduino Wiring
1. Stack PHPoC wifi shield or PHPoC shield on Arduino
2. Wiring like below image
Arduino wiring swbzlfta24

Code

Arduino CodeArduino
#include "SPI.h"
#include "Phpoc.h"

PhpocServer server(80);
boolean alreadyConnected = false; 

void setup() {
    Serial.begin(9600);
    while(!Serial)
        ;

    Phpoc.begin(PF_LOG_SPI | PF_LOG_NET);

    server.beginWebSocket("game");

    Serial.print("WebSocket server address : ");
    Serial.println(Phpoc.localIP());
    
    pinMode(6, INPUT); 
    pinMode(7, INPUT); 
    pinMode(8, INPUT); 
    pinMode(9, INPUT); 
    
}

int value_6 = digitalRead(6);
int value_7 = digitalRead(7);
int value_8 = digitalRead(8);
int value_9 = digitalRead(9);
int pre_dir_1 = 0;
int pre_dir_2 = 0;
int dir_1 = 0;
int dir_2 = 0;

void loop() {
    // when the client sends the first byte, say hello:
    PhpocClient client = server.available();
    if (client) {
        value_6 = digitalRead(6);
        value_7 = digitalRead(7);
        value_8 = digitalRead(8);
        value_9 = digitalRead(9);
        dir_1 = value_7 - value_6;
        dir_2 = value_9 - value_8;

        if(dir_1 != pre_dir_1 || dir_2 != pre_dir_2)
        {
            pre_dir_1 = dir_1;
            pre_dir_2 = dir_2;
            
            String txtMsg = "[" + String(dir_1) + ", " + String(dir_2) + "]\r\n";  
            char buf[txtMsg.length()+ 1];
            txtMsg.toCharArray(buf, txtMsg.length() + 1);
            server.write(buf, txtMsg.length());
        }         
    }
}
PHPoC Shield code (remote_game.php)PHP
<!DOCTYPE html>
<html>
<head>
<title>PHPoC - Game</title>
<meta name="viewport" content="width=device-width, initial-scale=0.7, maximum-scale=0.7">
<style>
body { text-align: center; font-size: 15pt; font-family: Arial, Helvetica, sans-serif;}
h1 { font-weight: bold; font-size: 25pt; }
h2 { font-weight: bold; font-size: 15pt; }
button { font-weight: bold; font-size: 15pt; }
</style>
<script>
window.requestAnimFrame = (function(callback) {
	return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
	function(callback) {
		window.setTimeout(callback, 1000 / 60);
	};
})();

var cvs_width = 400, cvs_height = 500;
var ball = {x:cvs_width / 2, y:cvs_height / 2 , radius:20, dir_x:1, dir_y:1, speed:3};
var obs_1 = {
	x:		100, 
	y:		150, 
	left:	0, // update later
	right: 	0, // update later
	top:	0, // update later
	bottom:	0, // update later
	width:	105, 
	height:	30, 
	dir:	1, // up down direction
	speed:	2
	};
var obs_2 = {
	x:		300, 
	y:		350, 
	left:	0, // update later
	right: 	0, // update later
	top:	0, // update later
	bottom:	0, // update later
	width:	105, 
	height:	30, 
	dir:	-1, // up down direction
	speed:	2
	};
var obstacles = [obs_1, obs_2];
var keeper_1 = {
	x:		cvs_width / 2, 
	y:		15, 
	left:	0, // update later
	right: 	0, // update later
	top:	0, // update later
	bottom:	0, // update later
	width:	105, 
	height:	30, 
	dir:	0, // left right direction
	speed:	8
	};
var keeper_2 = {
	x:		cvs_width / 2, 
	y:		cvs_height - 15, 
	left:	0, // update later
	right: 	0, // update later
	top:	0, // update later
	bottom:	0, // update later
	width:	105, 
	height:	30, 
	dir:	0, // left right direction
	speed:	8
	};
var keepers = [keeper_1, keeper_2];
var score = [0, 0];
var delay = 100;
 
var ws = null;
var ctx = null;

function init()
{
	var width = window.innerWidth;
	var height = window.innerHeight;
	
	var ratio_x = (width - 105) / (cvs_width);
	var ratio_y = (height - 200) / cvs_height;
	var ratio = (ratio_x < ratio_y) ? ratio_x : ratio_y;
	
	cvs_width *= ratio;
	cvs_height *= ratio;
	
	var canvas = document.getElementById("remote");
	canvas.width = cvs_width + 105;
	canvas.height = cvs_height;
	
	ctx = canvas.getContext("2d");
	ctx.translate(105, 0);
	ctx.lineWidth = 4;
	
	for( var i = 0; i < obstacles.length; i++)
	{
		obstacles[i].x *= ratio;
		obstacles[i].y *= ratio;
		obstacles[i].width *= ratio;
		obstacles[i].height *= ratio;
		obstacles[i].speed *= ratio;
		obstacles[i].left = obstacles[i].x - obstacles[i].width / 2;
		obstacles[i].right = obstacles[i].x + obstacles[i].width / 2;
		obstacles[i].top = obstacles[i].y - obstacles[i].height / 2;
		obstacles[i].bottom = obstacles[i].y + obstacles[i].height / 2;
	}
	
	for( var i = 0; i < keepers.length; i++)
	{
		keepers[i].x *= ratio;
		keepers[i].y *= ratio;
		keepers[i].width *= ratio;
		keepers[i].height *= ratio;
		keepers[i].speed *= ratio;
		keepers[i].left = keepers[i].x - keepers[i].width / 2;
		keepers[i].right = keepers[i].x + keepers[i].width / 2;
		keepers[i].top = keepers[i].y - keepers[i].height / 2;
		keepers[i].bottom = keepers[i].y + keepers[i].height / 2;
	}
	
	ball.x *= ratio;
	ball.y *= ratio;
	ball.radius *= ratio;
	ball.speed *= ratio;
	
	update_view(ctx);
}
function connect_onclick()
{
	if(ws == null)
	{
		var ws_host_addr = "<?echo _SERVER("HTTP_HOST")?>";
		ws = new WebSocket("ws://" + ws_host_addr + "/game", "text.phpoc");
		document.getElementById("ws_state").innerHTML = "CONNECTING";
		ws.onopen = ws_onopen;
		ws.onclose = ws_onclose;
		ws.onmessage = ws_onmessage;
	}
	else
		ws.close();
}
function ws_onopen()
{
	document.getElementById("ws_state").innerHTML = "<font color='blue'>CONNECTED</font>";
	document.getElementById("bt_connect").innerHTML = "Disconnect";
	ws.send("dummy\r\n");
}
function ws_onclose()
{
	document.getElementById("ws_state").innerHTML = "<font color='gray'>CLOSED</font>";
	document.getElementById("bt_connect").innerHTML = "Connect";
	ws.onopen = null;
	ws.onclose = null;
	ws.onmessage = null;
	ws = null;
}
function ws_onmessage(e_msg)
{
	e_msg = e_msg || window.event; // MessageEvent
	
	console.log(e_msg.data);
	var arr = JSON.parse(e_msg.data);
	keepers[0].dir = parseInt(arr[0]);
	keepers[1].dir = parseInt(arr[1]);
}
function update_view(ctx)
{
	ctx.clearRect(-105, 0, cvs_width, cvs_height); 
	
	ctx.fillStyle = "black";
	ctx.fillRect(0, 0, cvs_width, cvs_height); 
	
	ctx.beginPath();
	ctx.moveTo(-105, cvs_height / 2);
	ctx.lineTo(0, cvs_height / 2);
	ctx.stroke();
	ctx.font = "120px Georgia";
	ctx.textBaseline = "middle"; 
	ctx.textAlign = "center";
	var team_1 = score[0];
	var team_2 = score[1];
	ctx.fillStyle = "#00FF00";
	ctx.fillText(team_1.toString(), -50, cvs_height / 2 - 70);
	ctx.fillStyle = "#0000FF";
	ctx.fillText(team_2.toString(), -50, cvs_height / 2 + 50);
	
	ctx.fillStyle="#FF0000";
	ctx.beginPath();
	ctx.arc(ball.x, ball.y, ball.radius, 0, 2*Math.PI);
	ctx.fill();
	
	for( var i = 0; i < obstacles.length; i++)
		ctx.fillRect(obstacles[i].left, obstacles[i].top, obstacles[i].width, obstacles[i].height);
	
	ctx.fillStyle="#00FF00";
	ctx.fillRect(keeper_1.left, keeper_1.top, keeper_1.width, keeper_1.height);
	
	ctx.fillStyle="#0000FF";
	ctx.fillRect(keeper_2.left, keeper_2.top, keeper_2.width, keeper_2.height);
}
function collision_detect(object)
{
	var dist_x = Math.abs(ball.x - object.x);
	var dist_y = Math.abs(ball.y - object.y);
	var TOUCH_DIST_X = ball.radius + object.width / 2;
	var TOUCH_DIST_Y = ball.radius + object.height / 2;
	
	if(ball.x >= object.left && ball.x <= object.right)
	{
		if(dist_y <= TOUCH_DIST_Y)
		{
			ball.dir_y *= -1;
			
			if(ball.y < object.top)
				ball.y = object.top - ball.radius;
			else if(ball.y > object.bottom)
				ball.y = object.bottom + ball.radius;
			
			return true;
		}
		
		return false;
	}
	
	if(ball.y >= object.top && ball.y <= object.bottom)
	{
		if(dist_x <= TOUCH_DIST_X)
		{
		
			ball.dir_x *= -1;
			
			if(ball.x < object.left)
				ball.x = object.left - ball.radius;
			else if(ball.x > object.right)
				ball.x = object.right + ball.radius;
			
			return true;
		}
		
		return false;
	}
	
	
	if(dist_x < TOUCH_DIST_X && dist_y < TOUCH_DIST_Y)
	{
		dist_x -= object.width / 2; //distance to corner
		dist_y -= object.height / 2; //distance to corner
		if(dist_x == dist_y)
		{
			ball.dir_x *= -1;
			ball.dir_y *= -1;
		}
		else if(dist_x > dist_y)
			ball.dir_x *= -1;
		else
			ball.dir_y *= -1;
		
		return true;
	}
}
function check_edges()
{
	if((ball.x + ball.radius) >= cvs_width || (ball.x - ball.radius) <= 0)
		ball.dir_x *= -1;
	
	if((ball.y - ball.radius) >= cvs_height || (ball.y + ball.radius) <= 0)
	{
		if((ball.y - ball.radius) >= cvs_height)
			score[0] += 1;
		else
			score[1] += 1;
		
		ball.dir_y *= -1;
		ball.x = cvs_width / 2;
		ball.y = cvs_height / 2;
		delay = 100;
	}
}
function check_keepers()
{
	for( var i = 0; i < keepers.length; i++)
	{
		var obs = keepers[i];
		collision_detect(obs);
	}
}
function check_obstacles()
{
	for( var i = 0; i < obstacles.length; i++)
	{
		var obs = obstacles[i];
		collision_detect(obs);
	}
}
function move_ball()
{
	ball.x += ball.dir_x * ball.speed;
	ball.y += ball.dir_y * ball.speed;
}
function move_obstacles()
{
	for( var i = 0; i < obstacles.length; i++)
	{ 
		obstacles[i].y += obstacles[i].dir * obstacles[i].speed;
		
		if(obstacles[i].dir == 1 && obstacles[i].y > (cvs_height - 8*ball.radius))
			obstacles[i].dir = -1;
		else if(obstacles[i].dir == -1 && obstacles[i].y < (8*ball.radius))
			obstacles[i].dir = 1;
		
		obstacles[i].top = obstacles[i].y - obstacles[i].height / 2;
		obstacles[i].bottom = obstacles[i].y + obstacles[i].height / 2;
	}
}
function move_keepers()
{
	for( var i = 0; i < keepers.length; i++)
	{ 
		keepers[i].x += keepers[i].dir*keepers[i].speed;
		
		if(keepers[i].right > cvs_width && keepers[i].dir == 1)
		{
			keepers[i].dir *= 0;
			keepers[i].x = cvs_width - keepers[i].width / 2
		}
		
		if(keepers[i].left < 0 && keepers[i].dir == -1)
		{
			keepers[i].dir = 0;
			keepers[i].x = keepers[i].width / 2
		}
		
		keepers[i].left = keepers[i].x - keepers[i].width / 2;
		keepers[i].right = keepers[i].x + keepers[i].width / 2;
	}
}
function animate(ctx) 
{
	if(ws != null)
	{
		move_keepers();
		
		if(!delay)
		{
			move_ball();
			move_obstacles();
			check_edges();
			check_keepers();
			check_obstacles();
		}
		else
			delay--;
		
		update_view(ctx);
	}

	// request new frame
	requestAnimFrame(function() {
		animate(ctx);
	});
}

setTimeout(function() {
	animate(ctx);
}, 100);

window.onload = init;
</script>
</head>

<body>
<center>
<p>
<h1>PHPoC - Web-based Game</h1>
</p>
<canvas id="remote" width="400" height="500"></canvas>
<h2>
<p>
WebSocket : <span id="ws_state">null</span>
</p>
<button id="bt_connect" type="button" onclick="connect_onclick();">Connect</button>
</h2>
</center>
</body>
</html>

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