dsl/runtime/src/nl/ru/des/LCDPrinter.java

   1 package nl.ru.des;
   2
   3 import java.io.IOException;
   4 import java.io.OutputStream;
   5 import java.io.PrintStream;
   6 import java.util.Deque;
   7 import java.util.LinkedList;
   8
   9 import lejos.hardware.lcd.TextLCD;
  10 import lejos.utility.Delay;
  11
  12 public class LCDPrinter{
  13         public static final int PRINTDELAY = 50;
  14
  15         private static class Message{
  16                 public String msg;
  17                 public boolean nl;
  18
  19                 public Message(String msg, boolean nl){
  20                         this.msg = msg;
  21                         this.nl = nl;
  22                 }
  23         }
  24
  25         private static Deque<Message> buffer = new LinkedList<Message>();
  26
  27         public static void startLCDPrinter(final TextLCD glcd) {
  28                 new Thread(new Runnable(){
  29                         @Override
  30                         public void run() {
  31                                 while (true) {
  32                                         if (!buffer.isEmpty()) {
  33                                                 Message c = buffer.remove();
  34                                                 if(c.msg.length() > glcd.getTextWidth()){
  35                                                         buffer.addFirst(new Message(c.msg.substring(glcd.getTextWidth(), c.msg.length()), c.nl));
  36                                                         c.msg = c.msg.substring(0, glcd.getTextWidth());
  37                                                 }
  38                                                 if(c.nl){
  39                                                         glcd.scroll();
  40                                                 } else {
  41                                                         glcd.clear(glcd.getTextHeight()-1);
  42                                                 }
  43                                                 glcd.drawString(c.msg, 0, glcd.getTextHeight()-1);
  44                                         }
  45                                         Delay.msDelay(PRINTDELAY);
  46                                 }
  47                         }
  48                 }).start();
  49                 LCDPrinter.print("LCDThread started");
  50         }
  51
  52         public static void print(String s){
  53                 print(s, true);
  54         }
  55
  56         public synchronized static void print(String s, boolean nl){
  57                 buffer.addLast(new Message(s, nl));
  58         }
  59
  60         public static PrintStream getPrefixedPrintstream(final String prefix, final TextLCD glcd){
  61                 return new PrintStream(new OutputStream(){
  62                         private char[] line = new char[glcd.getTextWidth()];
  63                         private int index = 0;
  64
  65                         @Override
  66                         public void write(int b) throws IOException {
  67                                 if(index == line.length-prefix.length() || b == '\n'){
  68                                         LCDPrinter.print(prefix + String.valueOf(line, 0, index));
  69                                         index = 0;
  70                                 } else {
  71                                         line[index++] = (char)b;
  72                                 }
  73                         }
  74                 });
  75         }
  76 }