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Demo
Things Used In This Project
- 1 x PHPoC Blue
- 4 x Button
- 4 x Resistor 10k ohm
- Jumper wires
- 2 x Breadboard
Wiring Diagram
Data Flow
PHPoC ---> Web browser
There are two people playing game. each people uses two buttons to control direction of goalkeepers. Therefore, we need four buttons.
PHPoC reads the states of four buttons, If any of them is changed, PHPoC will re-calculated the moving direction of goalkeeper and send the direction values 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.
Source Code
Source code includes two files:
- index.php: This file is client side code. When receiving HTTP request from web browser, PHPoC 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 check collision as well. It also receives the moving direction of goalkeepers from websocket.
<index.php>
PHP Code:<!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";
}
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>
- task0.php: This file is server side code. It is run in infinite loop to read the states of fours and send it to web browser via WebSocket.
<task0.php>
PHP Code:<?php
include_once "/lib/sd_340.php";
include_once "/lib/sn_tcp_ws.php";
uio_setup(0, 12, "in_pd");
uio_setup(0, 13, "in_pd");
uio_setup(0, 20, "in_pd");
uio_setup(0, 21, "in_pd");
ws_setup(0, "game", "text.phpoc");
$pre_dir_1 = 0;
$pre_dir_2 = 0;
while(1)
{
if(ws_state(0) == TCP_CONNECTED)
{
$value_12 = uio_in(0, 12);
$value_13 = uio_in(0, 13);
$value_20 = uio_in(0, 20);
$value_21 = uio_in(0, 21);
$dir_1 = $value_13 - $value_12;
$dir_2 = $value_21 - $value_20;
if($dir_1 != $pre_dir_1 || $dir_2 != $pre_dir_2)
{
$pre_dir_1 = $dir_1;
$pre_dir_2 = $dir_2;
ws_write(0, "[$dir_1, $dir_2]");
}
}
}
?>