yabasic.xml

Linux下VB解释器

	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_poke">poke</link></term>
	  <listitem>
	    change selected internals of <application>yabasic</application>
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_rem">rem</link></term>
	  <listitem>
	    start a comment
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_sleep">sleep</link></term>
	  <listitem>
	    pause, sleep, wait for the specified number of seconds
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_system">system$()</link></term>
	  <listitem>
	    hand a statement over to your operating system and return its output
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_system2">system()</link></term>
	  <listitem>
	    hand a statement over to your operating system and return its exitcode
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_time">time$</link></term>
	  <listitem>
	    return a string containing the current time
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_to">to</link></term>
	  <listitem>
	    this keyword appears as part of other statements
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_wait">wait</link></term>
	  <listitem>
	    pause, sleep, wait for the specified number of seconds
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_double_slash">//</link></term>
	  <listitem>
	    starts a comment
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_colon">:</link></term>
	  <listitem>
	    separate commands from each other
	  </listitem>
	</varlistentry>

      </variablelist>
    </sect1>

    <sect1 renderas="sect2" id="top_graphics">
      <title>Graphics and printing</title>
      <variablelist>

	<varlistentry>
	  <term><link linkend="ref_backcolor">backcolor</link></term>
	  <listitem>
	    specify the colour for subsequent drawing of the background
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_box">box</link></term>
	  <listitem>
	    draw a rectangle. A synonym for <function>rectangle</function>
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_circle">circle</link></term>
	  <listitem>
	    draws a circle in the graphic-window
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_clear">clear</link></term>
	  <listitem>
	    Erase <function>circle</function>s, <function>rectangle</function>s or <function>triangles</function>s
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_clear_window">clear window</link></term>
	  <listitem>
	    clear the graphic window and begin a new page, if printing is under way
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_close_curve">close curve</link></term>
	  <listitem>
	    close a curve, that has been drawn by the <function>line</function>-command
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_close_window">close window</link></term>
	  <listitem>
	    close the graphics-window
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_colour">colour</link></term>
	  <listitem>
	    specify the colour for subsequent drawing
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_dot">dot</link></term>
	  <listitem>
	    draw a dot in the graphic-window
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_fill">fill</link></term>
	  <listitem>
	    draw a filled <function>circle</function>s, <function>rectangle</function>s or <function>triangle</function>s
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_getbit">getbit$()</link></term>
	  <listitem>
	    return a string representing the bit pattern of a rectangle within the graphic window
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_line">line</link></term>
	  <listitem>
	    draw a line
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_mouseb">mouseb</link></term>
	  <listitem>
	    extract the state of the mousebuttons from a string returned by <function>inkey$</function>
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_mousemod">mousemod</link></term>
	  <listitem>
	    return the state of the modifier keys during a mouseclick
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_mousex">mousex</link></term>
	  <listitem>
	    return the x-position of a mouseclick
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_mousey">mousey</link></term>
	  <listitem>
	    return the y-position of a mouseclick
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_new_curve">new curve</link></term>
	  <listitem>
	    start a new curve, that will be drawn with the <function>line</function>-command
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_open_window">open window</link></term>
	  <listitem>
	    open a graphic window
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_putbit">putbit</link></term>
	  <listitem>
	    draw a rectangle of pixels into the graphic window
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_rectangle">rectangle</link></term>
	  <listitem>
	    draw a rectangle
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_triangle">triangle</link></term>
	  <listitem>
	    draw a triangle
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_text">text</link></term>
	  <listitem>
	    write text into your graphic-window
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_origin">window origin</link></term>
	  <listitem>
	    move the origin of a window
	  </listitem>
	</varlistentry>

      </variablelist>
    </sect1>
  </chapter>

  <chapter id="chapter_ref_words">
    <title>All commands and functions of <application>yabasic</application> grouped alphabetically</title>


    <sect1 renderas="sect2" id="ref_a">
      <title>A</title>

      <refentry id="ref_abs">
	<refmeta>
	  <refentrytitle>abs()</refentrytitle>
	</refmeta>
	<refnamediv>
	  <refname>abs()</refname>
	  <refpurpose>returns the absolute value of its numeric argument</refpurpose>
	</refnamediv>
	<refsynopsisdiv>
	  <synopsis>y=abs(x)</synopsis>
	</refsynopsisdiv>
	<refsect1>
	  <title>Description</title>
	  <para>If the argument of the <function>abs</function>-function is positive (e.g. 2) it is returned unchanged, if the argument is negative (e.g. -1) it is returned as a positive value (e.g. 1).</para>
	</refsect1>
	<refsect1>
	  <title>Example</title>
	  <informalexample>
	    <programlisting>
print abs(-2),abs(2)
          </programlisting>
	    <para>This example will print <computeroutput>2 2</computeroutput></para>
	  </informalexample>
	</refsect1>
	<refsect1>
	  <title>See also</title>
	  <para><link linkend="ref_sig"><function>sig</function></link></para>
	</refsect1>
      </refentry>

      <refentry id="ref_acos">
	<refmeta>
	  <refentrytitle>acos()</refentrytitle>
	</refmeta>
	<refnamediv>
	  <refname>acos()</refname>
	  <refpurpose>returns the arcus cosine of its numeric argument</refpurpose>
	</refnamediv>
	<refsynopsisdiv>
	  <synopsis>x=acos(angle)</synopsis>
	</refsynopsisdiv>
	<refsect1>
	  <title>Description</title>
	  <para><function>acos</function> is the arcus cosine-function, i.e. the inverse of the <link linkend="ref_cos"><function>cos</function></link>-function. Or, more elaborate: It Returns the angle (in radian, not degree !), which, fed to the cosine-function will produce the argument passed to the <function>acos</function>-function.</para>
	</refsect1>
	<refsect1>
	  <title>Example</title>
	  <informalexample>
	    <programlisting>
print acos(0.5),acos(cos(pi))
          </programlisting>
	    <para>This example will print <computeroutput>1.0472 3.14159</computeroutput> which are &pgr;/3 and &pgr; respectively.</para>
	  </informalexample>
	</refsect1>
	<refsect1>
	  <title>See also</title>
	  <para><link linkend="ref_cos"><function>cos</function></link>, <link linkend="ref_asin"><function>asin</function></link></para>
	</refsect1>
      </refentry>

      <refentry id="ref_logical_and">
	<refmeta>
	  <refentrytitle>and</refentrytitle>
	</refmeta>
	<refnamediv>
	  <refname>and</refname>
	  <refpurpose>logical and, used in conditions</refpurpose>
	</refnamediv>
	<refsynopsisdiv>
	  <synopsis>
if (a and b) &hellip;
while (a and b) &hellip;
</synopsis>
	</refsynopsisdiv>
	<refsect1>
	  <title>Description</title>
	  <para>Used in conditions (e.g within <function><link linkend="ref_if">if</link></function>, <function><link linkend="ref_while">while</link></function> or <function><link linkend="ref_until">until</link></function>) to join two expressions. Returns <constant>true</constant>, if and only if its left and right argument are both <constant>true</constant> and <constant>false</constant> otherwise.</para>
	  <para>Note, that <link
linkend="ref_logical_shortcuts"><emphasis>logical shortcuts</emphasis></link> may take place.</para>
	</refsect1>
	<refsect1>
	  <title>Example</title>
	  <informalexample>
	    <programlisting>
input "Please enter a