Hardware components | ||||||
 |
| × | 1 | |||
| × | 1 | ||||
| × | 1 | ||||
 |
| × | 1 | |||
I made a similar project using Arduino here.
DemoThis classic game may make some of us feel childhood nostalgia. The game-play is simple, try to avoid hitting opponent cars and get many score as possible. The car can switch between 5 lanes, and there are 15 different speeds. As speed increases, opponent cars will run faster, making the game more difficult.
Data FlowPHPoC ---> Web browser
User interacts with rotary angle sensor. The input signal value of rotary angle sensor is used to switch the car's position.
PHPoC reads the value from rotary angle sensor. The input ADC values are divided into 5 different levels. Switching between levels means changing the lane. Simply, if the input signal is switched to another level, PHPoC will send the updated level to Web Browser via Websocket. Then, JavaScript function will update the position (lane) of the car. JavaScript program will continuously update position of opponents and game speed as well.
Source CodeSource code includes two files:
- index.php: This file contains client side code.
- task0.php: This file contains server side code. It is run in infinite loop to read the signal value from rotary angle sensor and send it to web browser via WebSocket.
<!DOCTYPE html>
<html>
<head>
<title>PHPoC - Web-based 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>
var cvs_width = 480, cvs_height = 400;
function object(x, y)
{
this.x = x;
this.y = y;
}
function racing_car(x, y)
{
this.last_x = -1;
this.x = x;
this.y = y;
}
var ws = null;
var ctx = null;
var user_car = null;
var opponent_cars = null;
var sidelines = null;
var cur_score = null;
var level_up = null;
var cur_level = null;
var speed_default = null;
var speed_delta = null;
var updated_speed = null;
var updated_timer = null;
var is_crashed = null;
var is_not_finished = null;
var car_width = null;
var car_height = null;
var line_width = null;
var block_size = null;
var line_distance = null;
var rect_line_width = null;
var blink_times = null;
function init()
{
cur_score = 0;
level_up = 0;
cur_level = 0;
speed_default = 300;
speed_delta = 20;
updated_speed = get_speed();
is_crashed = false;
is_not_finished = true;
blink_times = 0;
var width = window.innerWidth;
var height = window.innerHeight;
var ratio_x = (width - 250) / cvs_width;
var ratio_y = (height - 250) / cvs_height;
var ratio = (ratio_x < ratio_y) ? ratio_x : ratio_y;
cvs_width *= ratio;
cvs_height *= ratio;
block_size = cvs_height/24;
car_width = 3;
car_height = 4;
line_width = 2*ratio;
line_distance = 3*ratio;
rect_line_width = 1*ratio;
var canvas = document.getElementById("remote");
canvas.width = cvs_width;
canvas.height = cvs_height;
ctx = canvas.getContext("2d");
ctx.translate(100, 0);
opponent_cars = [];
for (var i = 0; i<3; i++)
{
opponent_cars.push(new object((Math.floor(Math.random() * 5))*car_width, -(8+2*Math.floor(Math.random()))));
opponent_cars.push(new object((Math.floor(Math.random() * 5))*car_width, -(24+2*Math.floor(Math.random()))));
}
sidelines = [];
for (var i = 0; i<7; i++)
{
sidelines.push(new object(-2, 4*i));
sidelines.push(new object(16, 4*i));
}
user_car = new racing_car(2*car_width, 20);
draw_car(user_car, false);
draw_sideline();
draw_grid();
}
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("init\r\n");
updated_timer = setInterval(game_process, updated_speed);
}
function ws_onclose()
{
document.getElementById("ws_state").innerHTML = "<font color='gray'>NOT CONNECTED</font>";
document.getElementById("bt_connect").innerHTML = "CONNECT";
ws.onopen = null;
ws.onclose = null;
ws.onmessage = null;
ws = null;
clearInterval(updated_timer);
}
function ws_onmessage(e_msg)
{
if (is_not_finished == true)
{
e_msg = e_msg || window.event;
user_car.x = parseInt(e_msg.data)*car_width;
}
}
function get_speed()
{
return (speed_default - speed_delta*cur_level)
}
function draw_score()
{
ctx.font = 1.5*block_size+"px Georgia";
ctx.fillText("SCORES",18*block_size,10*block_size);
ctx.font = 1.25*block_size+"px Georgia";
ctx.fillText(""+ cur_score,20*block_size,12*block_size);
}
function draw_car(obj, is_broken)
{
ctx.save();
ctx.translate(obj.x*block_size,obj.y*block_size);
if (is_broken == false)
{
ctx.fillStyle = "#020202";
}
else
{
ctx.fillStyle = "#202020";
}
ctx.fillRect(0, block_size, 3*block_size, block_size);
ctx.fillRect(block_size, 0, block_size, 3*block_size);
ctx.fillRect(0, 3*block_size, block_size, block_size);
ctx.fillRect(2*block_size, 3*block_size, block_size, block_size);
draw_rectangle(1,0);
draw_rectangle(1,1);
draw_rectangle(1,2);
draw_rectangle(0,1);
draw_rectangle(2,1);
draw_rectangle(0,3);
draw_rectangle(2,3);
ctx.restore();
}
function draw_rectangle(x,y)
{
ctx.beginPath();
ctx.lineWidth= rect_line_width;
ctx.strokeStyle="#FFFFFF";
ctx.rect(x*block_size+line_distance,y*block_size+line_distance,block_size-2*line_distance,block_size - 2*line_distance);
ctx.stroke();
}
function draw_grid()
{
ctx.save();
ctx.translate(-2*block_size,0);
ctx.lineWidth = line_width;
ctx.strokeStyle = "#FCFCFC";
for( var x_id = 0; x_id <= 19; x_id++)
{
ctx.beginPath();
ctx.moveTo(x_id*block_size,0);
ctx.lineTo(x_id*block_size,block_size*24);
ctx.stroke();
}
for( var y_id = 0; y_id <= 24; y_id++)
{
ctx.beginPath();
ctx.moveTo(0, y_id*block_size);
ctx.lineTo(block_size*19, y_id*block_size);
ctx.stroke();
}
ctx.restore();
}
function draw_sideline()
{
var move_down = 1;
if (is_not_finished == false)
{
move_down = 0;
}
for( var y_id = 0; y_id < 14; y_id++)
{
ctx.fillStyle = "#020202";
ctx.fillRect(sidelines[y_id].x*block_size , sidelines[y_id].y*block_size , block_size, 2*block_size);
draw_rectangle(sidelines[y_id].x,sidelines[y_id].y);
draw_rectangle(sidelines[y_id].x,sidelines[y_id].y+1);
sidelines[y_id].y += move_down;
if (sidelines[y_id].y > (user_car.y + car_height))
{
sidelines[y_id].y -= 7*car_height;
}
}
}
function move_opponent_cars()
{
for (var car_id = 0; car_id < 6; car_id++)
{
cur_y = opponent_cars[car_id].y;
if (cur_y <= (user_car.y + 3))
{
opponent_cars[car_id].y += 1;
}
else
{
cur_score += 1;
opponent_cars[car_id].x = (Math.floor(Math.random() * 5))*car_width;
opponent_cars[car_id].y += (-8*car_height+1);
}
}
level_up = Math.floor(cur_score/10);
if (level_up>cur_level)
{
clearInterval(updated_timer);
cur_level = level_up;
updated_speed = get_speed();
if (updated_speed == 0)
{
game_over();
return;
}
updated_timer = setInterval(game_process, updated_speed);
}
while (shuffle_needed())
{
for (var car_id = 0; car_id < 5; car_id++)
{
for (var car_id_2nd = car_id+1; car_id_2nd < 6; car_id_2nd++)
{
while ((opponent_cars[car_id_2nd].y == opponent_cars[car_id].y)&&
(Math.abs(opponent_cars[car_id_2nd].x - opponent_cars[car_id].x)<= car_width))
{
if (Math.random()>0.5)
{
opponent_cars[car_id_2nd].x = Math.floor(Math.random()* 5)*car_width;
}
else
{
opponent_cars[car_id_2nd].y -= Math.ceil(Math.random())*car_height;
}
}
while ((opponent_cars[car_id_2nd].x == opponent_cars[car_id].x)&&
(Math.abs(opponent_cars[car_id_2nd].y - opponent_cars[car_id].y)< 2*car_height))
{
opponent_cars[car_id_2nd].y -= Math.ceil(Math.random())*2;
}
}
}
}
}
function shuffle_needed()
{
for (var car_id = 0; car_id < 5; car_id++)
{
for (var car_id_2nd = car_id+1; car_id_2nd < 6; car_id_2nd++)
{
if ((opponent_cars[car_id_2nd].x == opponent_cars[car_id].x)&&
(Math.abs(opponent_cars[car_id_2nd].y - opponent_cars[car_id].y)< 2*car_height))
return true;
if ((opponent_cars[car_id_2nd].y == opponent_cars[car_id].y)&&
(Math.abs(opponent_cars[car_id_2nd].x - opponent_cars[car_id].x)<= car_width))
return true;
}
}
return false;
}
function check_crash()
{
var crash_car_id = null;
for (var car_id = 0; car_id < 6; car_id++)
{
cur_y = opponent_cars[car_id].y;
if ((cur_y > (user_car.y - car_height)) && (cur_y < (user_car.y + car_height)-1))
{
if (((opponent_cars[car_id].x < user_car.x) && (opponent_cars[car_id].x > user_car.last_x)) ||
((opponent_cars[car_id].x>user_car.x) && (opponent_cars[car_id].x < user_car.last_x)) || (opponent_cars[car_id].x == user_car.x))
{
is_not_finished = false;
crash_car_id = car_id;
if ((Math.abs(opponent_cars[car_id].x - user_car.last_x)) <= (Math.abs(opponent_cars[crash_car_id].x - user_car.last_x)))
{
crash_car_id = car_id;
user_car.x = opponent_cars[crash_car_id].x;
}
}
}
}
return (!is_not_finished);
}
function game_over()
{
ctx.clearRect(-100, 0, cvs_width, cvs_height);
ctx.font = 2*block_size+ "px Georgia";
if (is_crashed == true)
{
ctx.fillText("GAME OVER", 5*block_size, 10*block_size);
}
else
{
ctx.fillText("CONGRATULATION", 2*block_size, 10*block_size);
}
ctx.font = 1.5*block_size + "px Georgia";
ctx.fillText("SCORES", 8*block_size, 12*block_size);
ctx.font = 1.25*block_size + "px Georgia";
ctx.fillText(""+ cur_score, 10*block_size, 14*block_size);
}
function blinking()
{
ctx.clearRect(-100, 0, cvs_width, cvs_height);
for (var car_id = 0; car_id < 6; car_id++)
{
draw_car(opponent_cars[car_id], false);
}
draw_score();
draw_sideline();
draw_grid();
if ((blink_times % 2)==0){
draw_car(user_car, true);
}
if (blink_times > 4)
{
game_over();
}
else
{
setTimeout(function(){blinking();}, 500);
blink_times ++;
}
}
function update_scene()
{
if (is_not_finished == true)
{
ctx.clearRect(-100, 0, cvs_width, cvs_height);
for (var car_id = 0; car_id < 6; car_id++)
{
draw_car(opponent_cars[car_id],false);
}
draw_car(user_car,false);
draw_score();
draw_sideline();
draw_grid();
user_car.last_x = user_car.x;
}
}
function game_process()
{
if(ws != null)
{
is_crashed = check_crash();
if (is_crashed==true)
{
clearInterval(updated_timer);
blinking();
return;
}
move_opponent_cars();
update_scene();
}
}
window.onload = init;
</script>
</head>
<body>
<center>
<p>
<h1>PHPoC - Car Race </br> Brick Game</h1>
</p>
<canvas id="remote" width="500" height="400" Horizontal-align="middle";></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>
<?php
if(_SERVER("REQUEST_METHOD"))
exit; // avoid php execution via http request
include "/lib/sd_340.php";
include "/lib/sn_tcp_ws.php";
adc_setup(0, 0); // adc0, channel 0
ws_setup(0, "game", "text.phpoc");
$adc_min = 2048.0 - 2.5*400;
$last_adc_in = 0;
while(1)
{
if(ws_state(0) == TCP_CONNECTED)
{
$adc_in = adc_in(0, 30);
if(abs($adc_in - $last_adc_in) > 5)
{
$adc_5 = (int)floor((float)(($adc_in - $adc_min) / 400));
if ($adc_5<0)
{
$adc_5 =0;
}
else
if ($adc_5>4)
{
$adc_5 =4;
}
ws_write(0, (string)$adc_5 . "\r\n");
$last_adc_in = $adc_in;
}
}
}
?>
Comments