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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 
<html  
><head><!--mn23.html from mn.tex (TeX4ht, 1999-03-31 04:46:00)--> 
<title>source</title><link 
rel="stylesheet" type="text/css" href="mn.css"></head><body 
>
      <DIV CLASS="ShowCode"><PRE>
      &nbsp;         <SPAN CLASS="cmtt-10">%-- try.tex --</SPAN>
      &nbsp;  <SPAN CLASS="cmtt-10">\documentclass{article}</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">\usepackage{tex4ht}</SPAN>
      &nbsp;  <SPAN CLASS="cmtt-10">\begin{document}</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\input  ProTex.sty</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">\AlProTex{java,&lt;&lt;&lt;&gt;&gt;&gt;,list,title,`}</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\HCode{&lt;APPLET CODE=&#34;turtle.class&#34; WIDTH=&#34;300&#34; HEIGHT=&#34;300&#34;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt; &lt;/APPLET&gt;}</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\HPage{literate code}</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">A mini-turtle program.</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;turtle\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">import java.applet.*;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">import java.awt.*;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">public class turtle extends Applet</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">{</SPAN>
      &nbsp;
      &nbsp;   <SPAN CLASS="cmtt-10">Graphics g;</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">`&lt;vars`&gt;</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">`&lt;turtle functions`&gt;</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">public void init()</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">{</SPAN>
      &nbsp;     <SPAN CLASS="cmtt-10">`&lt;initial state`&gt;</SPAN>
      &nbsp;     <SPAN CLASS="cmtt-10">`&lt;draw interface`&gt;</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">public void paint(Graphics g) {</SPAN>
      &nbsp;     <SPAN CLASS="cmtt-10">this.g = g;</SPAN>
      &nbsp;     <SPAN CLASS="cmtt-10">`&lt;execute commands`&gt;</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">public boolean action(Event e,Object o)</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">{</SPAN>
      &nbsp;     <SPAN CLASS="cmtt-10">`&lt;get command`&gt;</SPAN>
      &nbsp;     <SPAN CLASS="cmtt-10">repaint();</SPAN>
      &nbsp;     <SPAN CLASS="cmtt-10">return true;</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">The turtle can move forward without trace, move forward</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">while tracing its path, and rotate.</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;turtle functions\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">void Move(int x, int y){ this.x += x;  this.y -= y; }</SPAN>
      &nbsp;
      &nbsp;   <SPAN CLASS="cmtt-10">void Move(int r){ x += (int) (r * Math.cos(d));</SPAN>
      &nbsp;                     <SPAN CLASS="cmtt-10">y -= (int) (r * Math.sin(d)); }</SPAN>
      &nbsp;
      &nbsp;   <SPAN CLASS="cmtt-10">void Line(int x, int y){</SPAN>
      &nbsp;      <SPAN CLASS="cmtt-10">g.drawLine( this.x, this.y,  this.x+x, this.y-y );</SPAN>
      &nbsp;      <SPAN CLASS="cmtt-10">Move(x,y);</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">void Line(int r){</SPAN>
      &nbsp;    <SPAN CLASS="cmtt-10">Line(   (new Double(r * Math.cos(d))).intValue(),</SPAN>
      &nbsp;            <SPAN CLASS="cmtt-10">(new Double( r * Math.sin(d) )).intValue() ); }</SPAN>
      &nbsp;
      &nbsp;   <SPAN CLASS="cmtt-10">void Rotate(int d){</SPAN>
      &nbsp;      <SPAN CLASS="cmtt-10">this.d += d * 3.14  / 180;</SPAN>
      &nbsp;      <SPAN CLASS="cmtt-10">while( 6.28 &lt; this.d ){ this.d -= 6.28; }</SPAN>
      &nbsp;      <SPAN CLASS="cmtt-10">while( this.d &lt; 0 ){ this.d += 6.28; }</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">The text field may be modified by the users.</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;vars\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">Button moveButton,</SPAN>
      &nbsp;       <SPAN CLASS="cmtt-10">lineButton,</SPAN>
      &nbsp;       <SPAN CLASS="cmtt-10">clearButton,</SPAN>
      &nbsp;       <SPAN CLASS="cmtt-10">rotateButton;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">TextField in;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;draw interface\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">clearButton  = new Button(&#34;Clear&#34;);   add(clearButton);</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">moveButton   = new Button(&#34;Move&#34;);    add(moveButton);</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">lineButton   = new Button(&#34;Line&#34;);    add(lineButton);</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">rotateButton = new Button(&#34;Rotate&#34;);  add(rotateButton);</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">in           = new TextField(3);      add(in);</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">in.setText( &#34;50&#34; );</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;execute commands\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;      <SPAN CLASS="cmtt-10">int i;</SPAN>
      &nbsp;  <SPAN CLASS="cmtt-10">x = 150; y = 150; d = 0;</SPAN>
      &nbsp;  <SPAN CLASS="cmtt-10">for( i=0; i&lt;N; i+=2 ){</SPAN>
      &nbsp;
      &nbsp;     <SPAN CLASS="cmtt-10">switch( command[i] ) {</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">case   `&lt;Line op`&gt;:{    Line( command[i+1] ); break; }</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">case   `&lt;Move op`&gt;:{    Move( command[i+1] ); break; }</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">case `&lt;Rotate op`&gt;:{  Rotate( command[i+1] ); break; }</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;get command\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">if(&#34;Clear&#34;.equals(o)) {  `&lt;initial state`&gt;  }</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">else{</SPAN>
      &nbsp;
      &nbsp;   <SPAN CLASS="cmtt-10">if(  &#34;Line&#34;.equals(o)){  command[N]=`&lt;Line op`&gt;;   }</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">if(  &#34;Move&#34;.equals(o)){  command[N]=`&lt;Move op`&gt;;   }</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">if(&#34;Rotate&#34;.equals(o)){  command[N]=`&lt;Rotate op`&gt;; }</SPAN>
      &nbsp;
      &nbsp;   <SPAN CLASS="cmtt-10">String s =  new String( in.getText() );</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">Integer i = new  Integer(     s  );</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">command[N+1]=   i.intValue();</SPAN>
      &nbsp;   <SPAN CLASS="cmtt-10">N+=2;</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">}</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;vars\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">int command[] = new int[300];</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;Line op\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">1</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;Move op\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">2</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;Rotate op\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">3</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;initial state\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">N = 0;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\&lt;vars\&gt;&lt;&lt;&lt;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">int N;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">int x, y;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">double d;</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">&gt;&gt;&gt;</SPAN>
      &nbsp;
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\OutputCode\&lt;turtle\&gt;     \Needs{&#34;javac turtle.java&#34;}</SPAN>
      &nbsp;
      &nbsp;<SPAN CLASS="cmtt-10">\EndHPage{}</SPAN>
      &nbsp;<SPAN CLASS="cmtt-10">\end{document}</SPAN>
</PRE></DIV>
     
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