mart/ev3/ex2/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 Deque<String> buffer = new LinkedList<String>();
  16
  17         public static void startLCDPrinter(final TextLCD glcd) {
  18                 new Thread(new Runnable(){
  19                         @Override
  20                         public void run() {
  21                                 while (true) {
  22                                         if (!buffer.isEmpty()) {
  23                                                 String c = buffer.remove();
  24                                                 if(c.length() > glcd.getTextWidth()){
  25                                                         buffer.addFirst(c.substring(glcd.getTextWidth(), c.length()));
  26                                                         c = c.substring(0, glcd.getTextWidth());
  27                                                 }
  28                                                 glcd.scroll();
  29                                                 glcd.drawString(c, 0, glcd.getTextHeight()-1);
  30                                         }
  31                                         Delay.msDelay(PRINTDELAY);
  32                                 }
  33                         }
  34                 }).start();
  35                 LCDPrinter.print("LCDThread started");
  36         }
  37
  38         public static void print(String s){
  39                 buffer.addLast(s);
  40         }
  41
  42         public static PrintStream getPrefixedPrintstream(final String prefix, final TextLCD glcd){
  43                 return new PrintStream(new OutputStream(){
  44                         private char[] line = new char[glcd.getTextWidth()];
  45                         private int index = 0;
  46
  47                         @Override
  48                         public void write(int b) throws IOException {
  49                                 if(index == line.length-prefix.length() || b == '\n'){
  50                                         LCDPrinter.print(prefix + String.valueOf(line, 0, index));
  51                                         index = 0;
  52                                 } else {
  53                                         line[index++] = (char)b;
  54                                 }
  55                         }
  56                 });
  57         }
  58 }