How to show text in a LED matrix with your browser

1/********
2Control a sure led matrix through your browser
3
4Go on http://arduino.local/sd/message  , write your
5message in the form and click the button and it
6will appear on the  matrix as a scrolling text.
7
8This sketch put received messages inside a queue  and display
9them in the correct order.
10New messages will overwrite old ones if  the buffer is full.
11
12
13Written by Angelo Scialabba
14@12 Sept 2013
15
16********/
17#include  <font_5x4.h>
18#include <HT1632.h>
19#include <images.h>
20#include <Bridge.h>
21#include  <YunServer.h>
22#include <YunClient.h>
23
24YunServer server;
25int x_pos = 0;
26int  curr_msg, last_msg;
27int wd;
28String msg[10];  //10 messages can be stored in the  queue
29char final_message[32];
30
31
32void setup () {
33  // Setup and begin the matrix
34  // HT1632.begin(CS1,WR,DATA)
35  HT1632.begin( 9, 10, 11);
36  Serial.begin(9600);
37  Bridge.begin();
38  server.listenOnLocalhost();
39  server.begin();  
40  
41  //************Set  the standard message************
42  msg[0] = "No MSG";
43  msg[0].toCharArray(final_message,32);
44  wd = HT1632.getTextWidth(final_message, FONT_5X4_WIDTH, FONT_5X4_HEIGHT); // Give  the width, in columns, of the assigned string
45  
46  //************Set the buffer's  variables*********
47  curr_msg = 0;
48  last_msg = 0;
49}
50 
51void loop () {
52  //*********Read  new message from the server**************
53  YunClient client = server.accept();
54  
55  if(client) {
56    String command = client.readStringUntil('/');
57    if (command  == "msg") {      
58      if (last_msg > 8 ) last_msg = 0;
59      else last_msg++;
60      msg[last_msg] = client.readStringUntil('/');            
61    }
62    client.stop();
63    
64  } 
65  
66  
67  //*****Display the message on the matrix*****
68  HT1632.drawTarget(BUFFER_BOARD(1));
69  HT1632.clear();
70  HT1632.drawText(final_message, 2*OUT_SIZE - x_pos, 2, FONT_5X4,  FONT_5X4_WIDTH, FONT_5X4_HEIGHT, FONT_5X4_STEP_GLYPH);
71  HT1632.render();
72  
73  
74  
75  //*************Scroll the message and select new messages*****************
76  
77  x_pos++;; //shift the message of 1 column to left
78  
79  //check if the the  entire message scrolled out the matrix
80  if  (x_pos == (wd + OUT_SIZE * 2)) {  
81    
82    x_pos = 0;        //set the message position to the initial position
83    
84    if (curr_msg!=last_msg){         //is there an unread message?
85    
86      if (curr_msg < 9 ) curr_msg++;  //select the next message
87      else curr_msg  = 0;     //end of the buffer, start from beginning  (the next message overwrote  the first)
88      msg[curr_msg].toCharArray(final_message,32);   //convert the string  into a char array
89      wd = HT1632.getTextWidth(final_message, FONT_5X4_WIDTH,  FONT_5X4_HEIGHT); // Give the width, in columns, of the assigned string
90      
91    }
92  }
93  
94  delay(150);
95}