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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  
  "http://www.w3.org/TR/html4/loose.dtd">  
<html > 
<head><title>Controlling the interface</title> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
<meta name="generator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> 
<meta name="originator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> 
<!-- 3,html --> 
<meta name="src" content="nipguide.tex"> 
<meta name="date" content="2016-05-18 20:41:00"> 
<link rel="stylesheet" type="text/css" href="nipguide.css"> 
</head><body 
>
  <!--l. 1292--><div class="crosslinks"><p class="noindent">[<a 
href="nipguidese34.html" >next</a>] [<a 
href="nipguidese32.html" >prev</a>] [<a 
href="nipguidese32.html#tailnipguidese32.html" >prev-tail</a>] [<a 
href="#tailnipguidese33.html">tail</a>] [<a 
href="nipguidech6.html#nipguidese33.html" >up</a>] </p></div>
  <h3 class="sectionHead"><span class="titlemark">6.12    </span> <a 
 id="x44-790006.12"></a>Controlling the interface</h3>
<!--l. 1293--><p class="noindent" ><a name="nip_label_sec:bowser"></a>
<!--l. 1295--><p class="indent" >  <span 
class="phvr7t-x-x-80">nip2 </span>looks at the scraps of program you type in and
execute and tries to show them on the screen in a graphical
way. The sorts of display you get depend on where in <span 
class="phvr7t-x-x-80">nip2</span>
you define the expression, and what sort of value it
has.
<!--l. 1300--><p class="noindent" >
  <h4 class="subsectionHead"><span class="titlemark">6.12.1    </span> <a 
 id="x44-800006.12.1"></a>Tools and toolkits</h4>
<!--l. 1301--><p class="noindent" ><a name="nip_label_sec:tools"></a>
<!--l. 1303--><p class="indent" >  Definitions in toolkits are turned into menus off the
<span 
class="phvr7t-x-x-80">Toolkits </span>menu in the main window, and added to the toolkit
browser. Toolkits are loaded from files at startup or can be
made in the program window. Toolkit or a definition names
which start with an underscore character are hidden and not
displayed. The toolkits are always displayed in alphabetical
order, but you can order the items within a toolkit in any
way you like.
<!--l. 1311--><p class="indent" >  There are two ways to write toolkit definitions. Function
definitions and zero-argument classes simply appear as
menu items, built from static analysis of their source code.
However, if a definition evaluates to an instance of the class
<span 
class="phvr7t-x-x-80">Menu</span>, a menu item is built from dynamic analysis of the
value of the definition.
<!--l. 1317--><p class="noindent" >
  <h5 class="subsubsectionHead"><a 
 id="x44-810006.12.1"></a>Static menu items</h5>
<!--l. 1319--><p class="noindent" >Zero-argument classes within toolkits are displayed as
pull-right menus. You can nest classes to any depth.
<!--l. 1322--><p class="indent" >  <span 
class="phvr7t-x-x-80">nip2 </span>uses the first line of the comment before a definition
as help text for that function, so it&#8217;s a good idea to put a
simple one-line description of the function at the start of a
comment.
<!--l. 1326--><p class="indent" >  For example, if the following text is placed in a file called
<span 
class="phvr7t-x-x-80">Fred.def </span>on <span 
class="phvr7t-x-x-80">nip2</span>&#8217;s start path, you&#8217;ll get a menu in the
tookits called <span 
class="phvr7t-x-x-80">Fred </span>with a pull-right and a tooltip. See
Figure&#x00A0;<a 
href="#x44-810011">6.1<!--tex4ht:ref: fg:toolkit --></a>.
                                                 <div class="verbatim" id="verbatim-84">
  Banana&#x00A0;a&#x00A0;=&#x00A0;a&#x00A0;&#x22C6;&#x00A0;3;
 &#x00A0;<br />
 &#x00A0;<br />Subfred&#x00A0;=&#x00A0;class&#x00A0;{
 &#x00A0;<br />&#x00A0;&#x00A0;//&#x00A0;add&#x00A0;two&#x00A0;things
 &#x00A0;<br />&#x00A0;&#x00A0;Jim&#x00A0;a&#x00A0;b&#x00A0;=&#x00A0;a&#x00A0;+&#x00A0;b;
 &#x00A0;<br />&#x00A0;&#x00A0;Apple&#x00A0;e&#x00A0;=&#x00A0;e&#x00A0;&#x22C6;&#x00A0;12;
 &#x00A0;<br />&#x00A0;&#x00A0;Harry&#x00A0;z&#x00A0;=&#x00A0;12&#x00A0;+&#x00A0;z;
 &#x00A0;<br />} 
</div>
<!--l. 1339--><p class="nopar" >
<!--l. 1341--><p class="indent" >  <hr class="figure"><div class="figure" 
>
                                                                                       

                                                                                       
<a 
 id="x44-810011"></a>
                                           
                                                                                       

                                                                                       
<div class="center" 
>
<!--l. 1342--><p class="noindent" >

<!--l. 1342--><p class="noindent" ><img 
src="figs/toolkit.jpg" alt="PIC"  
></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;6.1: </span><span  
class="content">How <span 
class="phvr7t-x-x-80">Fred.def </span>will look</span></div><!--tex4ht:label?: x44-810011 -->
<!--l. 1344--><p class="noindent" ><a name="nip_label_fg:toolkit"></a>
                                           
                                                                                       

                                                                                       
<!--l. 1345--><p class="indent" >  </div><hr class="endfigure">
  <h5 class="subsubsectionHead"><a 
 id="x44-820006.12.1"></a>Dynamic menu items</h5>
<!--l. 1349--><p class="noindent" >Dynamic menus give you much more control over the way
menus are drawn and make it easy to reuse menus. A
dynamic menu item is a class instance that is a sub-class of
<span 
class="phvr7t-x-x-80">Menuitem</span>. It needs to have three members: <span 
class="phvr7t-x-x-80">label</span>, the text that
should appear in the menu (with an underscore character to
indicate the mnenonic); <span 
class="phvr7t-x-x-80">tooltip</span>, a short hint that appears as a
tooltip or in the toolkit browser; <span 
class="phvr7t-x-x-80">icon</span>, an optional image
file to be displayed in the menu next to the text; and
<span 
class="phvr7t-x-x-80">action</span>, the function that is called when the menu item is
activated. <span 
class="phvr7t-x-x-80">label </span>and <span 
class="phvr7t-x-x-80">tooltip </span>are constructor arguments for
<span 
class="phvr7t-x-x-80">Menu</span>.
<!--l. 1359--><p class="indent" >  So for example:
                                                 <div class="verbatim" id="verbatim-85">
  Wombat_find_item&#x00A0;=&#x00A0;class&#x00A0;Menuitem
 &#x00A0;<br />&#x00A0;&#x00A0;"_Find&#x00A0;Wombat"
 &#x00A0;<br />&#x00A0;&#x00A0;"analyse&#x00A0;image&#x00A0;and&#x00A0;locate&#x00A0;wombat"&#x00A0;{
 &#x00A0;<br />&#x00A0;&#x00A0;icon&#x00A0;=&#x00A0;"nip-slider-16.png";
 &#x00A0;<br />&#x00A0;&#x00A0;action&#x00A0;x&#x00A0;=&#x00A0;im_wombat_locate&#x00A0;x;
 &#x00A0;<br />} 
</div>
<!--l. 1368--><p class="nopar" >
<!--l. 1370--><p class="noindent" >will appear as shown in Figure&#x00A0;<a 
href="#x44-820012">6.2<!--tex4ht:ref: fg:toolkit2 --></a>.
<!--l. 1373--><p class="indent" >    <hr class="figure"><div class="figure" 
>
                                                                                       

                                                                                       
<a 
 id="x44-820012"></a>
                                           
                                                                                       

                                                                                       
<div class="center" 
>
<!--l. 1374--><p class="noindent" >

<!--l. 1374--><p class="noindent" ><img 
src="figs/toolkit2.jpg" alt="PIC"  
></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;6.2: </span><span  
class="content">How <span 
class="phvr7t-x-x-80">Wombat</span><span 
class="phvr7t-x-x-80">_find</span><span 
class="phvr7t-x-x-80">_item </span>will look</span></div><!--tex4ht:label?: x44-820012 -->
<!--l. 1376--><p class="noindent" ><a name="nip_label_fg:toolkit2"></a>
                                           
                                                                                       

                                                                                       
<!--l. 1377--><p class="indent" >  </div><hr class="endfigure">
<!--l. 1379--><p class="indent" >  A dynamic pullright menu is a subclass of <span 
class="phvr7t-x-x-80">Menupullright</span>.
It&#8217;s just like <span 
class="phvr7t-x-x-80">Menuitem</span>, but without the need for an <span 
class="phvr7t-x-x-80">action</span>
member. Any members which are subclasses of <span 
class="phvr7t-x-x-80">Menu </span>are
displayed as items in the submenu. So again:
                                                 <div class="verbatim" id="verbatim-86">
  Wombat_item&#x00A0;=&#x00A0;class&#x00A0;Menupullright
 &#x00A0;<br />&#x00A0;&#x00A0;"_Wombat"
 &#x00A0;<br />&#x00A0;&#x00A0;"wombat-related&#x00A0;operations"&#x00A0;{
 &#x00A0;<br />&#x00A0;&#x00A0;icon&#x00A0;=&#x00A0;"nip-slider-16.png";
 &#x00A0;<br />&#x00A0;&#x00A0;item1&#x00A0;=&#x00A0;Wombat_find_item;
 &#x00A0;<br />&#x00A0;&#x00A0;sep&#x00A0;=&#x00A0;Menuseparator;
 &#x00A0;<br />&#x00A0;&#x00A0;boink&#x00A0;=&#x00A0;Wombat_find_item;
 &#x00A0;<br />} 
</div>
<!--l. 1393--><p class="nopar" >
<!--l. 1395--><p class="noindent" >will appear as shown in Figure&#x00A0;<a 
href="#x44-820023">6.3<!--tex4ht:ref: fg:toolkit3 --></a>.
<!--l. 1398--><p class="indent" >    <hr class="figure"><div class="figure" 
>
                                                                                       

                                                                                       
<a 
 id="x44-820023"></a>
                                           
                                                                                       

                                                                                       
<div class="center" 
>
<!--l. 1399--><p class="noindent" >

<!--l. 1399--><p class="noindent" ><img 
src="figs/toolkit3.jpg" alt="PIC"  
></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;6.3: </span><span  
class="content">How <span 
class="phvr7t-x-x-80">Wombat</span><span 
class="phvr7t-x-x-80">_item </span>will look</span></div><!--tex4ht:label?: x44-820023 -->
<!--l. 1401--><p class="noindent" ><a name="nip_label_fg:toolkit3"></a>
                                           
                                                                                       

                                                                                       
<!--l. 1402--><p class="indent" >  </div><hr class="endfigure">
  <h4 class="subsectionHead"><span class="titlemark">6.12.2    </span> <a 
 id="x44-830006.12.2"></a>Workspaces</h4>
<!--l. 1405--><p class="noindent" ><a name="nip_label_sec:workspaces"></a>
<!--l. 1407--><p class="indent" >  Definitions in workspaces are displayed with <span 
class="phvr7t-x-x-80">nip2</span>&#8217;s class
browser. Each row is displayed in four main parts: a button
for the row name, a line of text, a set of sub-rows for
the members of the row&#8217;s class, and a graphic display
representing the row&#8217;s value. See Figure&#x00A0;<a 
href="#x44-830014">6.4<!--tex4ht:ref: fg:row2 --></a>.
<!--l. 1412--><p class="indent" >  <hr class="figure"><div class="figure" 
>
                                           
                                                                                       

                                                                                       
<a 
 id="x44-830014"></a>
                                           
                                                                                       

                                                                                       
<div class="center" 
>
<!--l. 1413--><p class="noindent" >

<!--l. 1413--><p class="noindent" ><img 
src="figs/ir8a.jpg" alt="PIC"  
></div>
<br /> <div class="caption" 
><span class="id">Figure&#x00A0;6.4: </span><span  
class="content">Components of a workspace row</span></div><!--tex4ht:label?: x44-830014 -->
<!--l. 1415--><p class="noindent" ><a name="nip_label_fg:row2"></a>
                                           
                                                                                       

                                                                                       
<!--l. 1416--><p class="indent" >  </div><hr class="endfigure">
<!--l. 1418--><p class="indent" >  The text part of the right-hand-side of each row is always
displayed, but the sub-rows are only displayed if the row
represents a class, and the graphic is only displayed if the
class is an instance of one of the classes in Table&#x00A0;<a 
href="#x44-830025">6.5<!--tex4ht:ref: tb:classes --></a>. You
can subclass these if you want to use the graphic display in
your own widgets.
<!--l. 1424--><p class="indent" >  There are three separate ways to set the value for a row.
You can edit the line of program text, you can edit one
of the members, or you can manipulate the graphic
representation (dragging a slider, or moving a region).
These can be contradictory, so <span 
class="phvr7t-x-x-80">nip2 </span>resolves conflicts by
always applying changes in the order text, then graphic,
then member.
<!--l. 1430--><p class="indent" >  When it applies a graphic change, <span 
class="phvr7t-x-x-80">nip2 </span>rebuilds the class
using a class member called <span 
class="ptmri7t-">class-name</span><span 
class="phvr7t-x-x-80">_edit</span>, or if that is not
defined, the class&#8217;s constructor member. For example, the
<span 
class="phvr7t-x-x-80">Colour </span>class can be defined as:
                                                 <div class="verbatim" id="verbatim-87">
  Colour&#x00A0;colour_space&#x00A0;value&#x00A0;=&#x00A0;class&#x00A0;{}
 &#x00A0;<br />A1&#x00A0;=&#x00A0;Colour&#x00A0;"sRGB"&#x00A0;[255,0,0]; 
</div>
<!--l. 1438--><p class="nopar" >
<!--l. 1440--><p class="noindent" >There are two ways to change <span 
class="phvr7t-x-x-80">A1</span>. You can open <span 
class="phvr7t-x-x-80">A1 </span>and
change <span 
class="phvr7t-x-x-80">colour</span><span 
class="phvr7t-x-x-80">_space </span>to <span 
class="phvr7t-x-x-80">&#8221;Lab&#8221;</span>, or you can double-click on the
swatch and drag the disc. When you click <span 
class="phvr7t-x-x-80">OK </span>on the colour
edit dialog, <span 
class="phvr7t-x-x-80">nip2 </span>searches for a member called <span 
class="phvr7t-x-x-80">Colour</span><span 
class="phvr7t-x-x-80">_edit</span>,
fails to find it, and so picks the <span 
class="phvr7t-x-x-80">Colour </span>member instead (the
default constructor generated by <span 
class="phvr7t-x-x-80">nip2</span>). It then replaces the
value of A1 with
<!--l. 1448--><p class="indent" >    [needs finishing]
                                                                                       

                                                                                       
<!--l. 1451--><p class="indent" >  <a 
 id="x44-830025"></a><hr class="float"><div class="float" 
>
                                           
                                                                                       

                                                                                       
<div class="center" 
>
<!--l. 1451--><p class="noindent" >
<div class="tabular"> <table id="TBL-7" class="tabular" 
cellspacing="0" cellpadding="0" rules="groups" 
><colgroup id="TBL-7-1g"><col 
id="TBL-7-1"></colgroup><colgroup id="TBL-7-2g"><col 
id="TBL-7-2"></colgroup><tr 
class="hline"><td><hr></td><td><hr></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-7-1-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-1-1"  
class="td11">Class                                                        </td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-1-2"  
class="td11">Description                                             </td>
</tr><tr 
class="hline"><td><hr></td><td><hr></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-7-2-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-2-1"  
class="td11"><span 
class="phvr7t-x-x-80">Clock </span><span 
class="phvro7t-x-x-80">interval value                                           </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-2-2"  
class="td11">A clock widget, handy for animations    </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-3-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-3-1"  
class="td11"><span 
class="phvr7t-x-x-80">Expression </span><span 
class="phvro7t-x-x-80">caption expr                                    </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-3-2"  
class="td11">Displays an editable expression              </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-4-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-4-1"  
class="td11"><span 
class="phvr7t-x-x-80">Group </span><span 
class="phvro7t-x-x-80">value                                                       </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-4-2"  
class="td11">A group of objects for iteration              </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-5-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-5-1"  
class="td11"><span 
class="phvr7t-x-x-80">List </span><span 
class="phvro7t-x-x-80">value                                                           </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-5-2"  
class="td11">A list of related objects                           </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-6-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-6-1"  
class="td11"><span 
class="phvr7t-x-x-80">Pathname </span><span 
class="phvro7t-x-x-80">caption value                                    </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-6-2"  
class="td11">Displays a file browser                           </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-7-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-7-1"  
class="td11"><span 
class="phvr7t-x-x-80">Fontname </span><span 
class="phvro7t-x-x-80">caption value                                    </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-7-2"  
class="td11">Displays a font browser                          </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-8-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-8-1"  
class="td11"><span 
class="phvr7t-x-x-80">Toggle </span><span 
class="phvro7t-x-x-80">caption value                                          </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-8-2"  
class="td11">A toggle switch                                       </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-9-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-9-1"  
class="td11"><span 
class="phvr7t-x-x-80">Scale </span><span 
class="phvro7t-x-x-80">caption from to value                               </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-9-2"  
class="td11">A slider                                                   </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-10-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-10-1"  
class="td11"><span 
class="phvr7t-x-x-80">Option </span><span 
class="phvro7t-x-x-80">caption labels value                               </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-10-2"  
class="td11">Select one item from a list                      </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-11-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-11-1"  
class="td11"><span 
class="phvr7t-x-x-80">Colour </span><span 
class="phvro7t-x-x-80">colour</span><span 
class="phvro7t-x-x-80">_space value                                </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-11-2"  
class="td11">A patch of colour                                    </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-12-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-12-1"  
class="td11"><span 
class="phvr7t-x-x-80">Matrix</span><span 
class="phvr7t-x-x-80">_vips </span><span 
class="phvro7t-x-x-80">value scale offset filename display</span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-12-2"  
class="td11">A matrix                                                  </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-13-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-13-1"  
class="td11"><span 
class="phvr7t-x-x-80">Arrow </span><span 
class="phvro7t-x-x-80">image left top width height                      </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-13-2"  
class="td11">Two points joined by a line on an image</td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-14-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-14-1"  
class="td11"><span 
class="phvr7t-x-x-80">Region </span><span 
class="phvro7t-x-x-80">image left top width height                    </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-14-2"  
class="td11">A sub-area of an image                           </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-15-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-15-1"  
class="td11"><span 
class="phvr7t-x-x-80">Plot </span><span 
class="phvro7t-x-x-80">options value                                              </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-15-2"  
class="td11">Displays a plot widget                            </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-16-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-16-1"  
class="td11"><span 
class="phvr7t-x-x-80">Image </span><span 
class="phvro7t-x-x-80">value                                                       </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-16-2"  
class="td11">An image                                                </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-17-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-17-1"  
class="td11"><span 
class="phvr7t-x-x-80">Number </span><span 
class="phvro7t-x-x-80">caption value                                       </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-17-2"  
class="td11">Displays an editable number                  </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-18-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-18-1"  
class="td11"><span 
class="phvr7t-x-x-80">Real </span><span 
class="phvro7t-x-x-80">value                                                         </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-18-2"  
class="td11">Displays a real number                           </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-19-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-19-1"  
class="td11"><span 
class="phvr7t-x-x-80">Vector </span><span 
class="phvro7t-x-x-80">value                                                       </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-19-2"  
class="td11">Displays a list of reals                             </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-20-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-20-1"  
class="td11"><span 
class="phvr7t-x-x-80">String </span><span 
class="phvro7t-x-x-80">caption value                                           </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-20-2"  
class="td11">Displays an editable string                      </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-21-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-21-1"  
class="td11"><span 
class="phvr7t-x-x-80">Mark </span><span 
class="phvro7t-x-x-80">image left top                                           </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-21-2"  
class="td11">A point on an image                               </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-22-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-22-1"  
class="td11"><span 
class="phvr7t-x-x-80">HGuide </span><span 
class="phvro7t-x-x-80">image top                                             </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-22-2"  
class="td11">A horizontal line on an image                </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-23-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-23-1"  
class="td11"><span 
class="phvr7t-x-x-80">VGuide </span><span 
class="phvro7t-x-x-80">image left                                              </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-23-2"  
class="td11">A vertical line on an image                     </td>
</tr><tr  
 style="vertical-align:baseline;" id="TBL-7-24-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-24-1"  
class="td11"><span 
class="phvr7t-x-x-80">Area </span><span 
class="phvro7t-x-x-80">image left top width height                       </span></td><td  style="white-space:nowrap; text-align:left;" id="TBL-7-24-2"  
class="td11">A sub-area of an image, fixed in size     </td>
</tr><tr 
class="hline"><td><hr></td><td><hr></td></tr><tr  
 style="vertical-align:baseline;" id="TBL-7-25-"><td  style="white-space:nowrap; text-align:left;" id="TBL-7-25-1"  
class="td11">                            </td></tr></table></div></div>
<br /><div class="caption" 
><span class="id">Table&#x00A0;6.5: </span><span  
class="content"><span 
class="phvr7t-x-x-80">nip2 </span>built in graphic classes</span></div><!--tex4ht:label?: x44-830025 -->
<!--l. 1507--><p class="noindent" ><a name="nip_label_tb:classes"></a>
                                           
                                                                                       

                                                                                       
  </div><hr class="endfloat" />
  <h4 class="subsectionHead"><span class="titlemark">6.12.3    </span> <a 
 id="x44-840006.12.3"></a>The <span 
class="phvr7t-x-x-80">Image </span>class</h4>
<!--l. 1511--><p class="noindent" ><a name="nip_label_sec:Image"></a> .
<!--l. 1513--><p class="indent" >  say supports mioxed ops with real, vector and complex
constants
<!--l. 1515--><p class="noindent" >
  <h4 class="subsectionHead"><span class="titlemark">6.12.4    </span> <a 
 id="x44-850006.12.4"></a>The <span 
class="phvr7t-x-x-80">Colour </span>class</h4>
<!--l. 1516--><p class="noindent" ><a name="nip_label_sec:colour"></a>
<!--l. 1518--><p class="indent" >  This class displays a swatch of colour. If you double-click
on the
                                                 <div class="verbatim" id="verbatim-88">
  Pathname&#x00A0;caption&#x00A0;value&#x00A0;=&#x00A0;class&#x00A0;{} 
</div>
<!--l. 1522--><p class="nopar" >
                                                                                       

                                                                                       
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