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Code Editor : pic-9.html
<!-- Creator : groff version 1.22.4 --> <!-- CreationDate: Wed Mar 23 13:56:30 2022 --> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta name="generator" content="groff -Thtml, see www.gnu.org"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta name="Content-Style" content="text/css"> <style type="text/css"> p { margin-top: 0; margin-bottom: 0; vertical-align: top } pre { margin-top: 0; margin-bottom: 0; vertical-align: top } table { margin-top: 0; margin-bottom: 0; vertical-align: top } h1 { text-align: center } </style> <title>pic-9.html</title> </head> <hr> [ <a href="pic-8.html">prev</a> | <a href="pic-10.html">next</a> | <a href="pic.html">top</a> ] <hr> <h2>9. Naming Objects <a name="9. Naming Objects"></a> </h2> <p style="margin-top: 1em"><font color="#000000">The most natural way to name locations in <b>pic</b> is relative to objects. In order to do this, you have to be able to name objects. The <b>pic</b> language has rich facilities for this that try to emulate the syntax of English.</font></p> <h3>9.1. Naming Objects By Order Of Drawing <a name="9.1. Naming Objects By Order Of Drawing"></a> </h3> <p style="margin-top: 1em"><font color="#000000">The simplest (and generally the most useful) way to name an object is with a <b>last</b> clause. It needs to be followed by an object type name; <b>box</b>, <b>circle</b>, <b>ellipse</b>, <b>line</b>, <b>arrow</b>, <b>spline</b>, <b>""</b>, or <b>[]</b> (the last type refers to a <i>composite object</i> which we’ll discuss later). So, for example, the <b>last circle</b> clause in the program attached to Figure 9.1.3 refers to the last circle drawn.</font></p> <p style="margin-top: 1em"><font color="#000000">More generally, objects of a given type are implicitly numbered (starting from 1). You can refer to (say) the third ellipse in the current picture with <b>3rd ellipse</b>, or to the first box as <b>1st box</b>, or to the fifth text string (which isn’t an attribute to another object) as <b>5th ""</b>.</font></p> <p style="margin-top: 1em"><font color="#000000">Objects are also numbered backwards by type from the last one. You can say <b>2nd last box</b> to get the second-to-last box, or <b>3rd last ellipse</b> to get the third-to-last ellipse.</font></p> <p style="margin-top: 1em"><font color="#000000">In places where <i>n</i><b>th</b> is allowed, <b>‘</b><i>expr</i><b>’th</b> is also allowed. Note that <b>’th</b> is a single token: no space is allowed between the <b>’</b> and the <b>th</b>. For example,</font></p> <p style="margin-left:20%; margin-top: 1em"><font color="#000000">for i = 1 to 4 do { <br> line from ‘i’th box.nw to ‘i+1’th box.se <br> }</font></p> <h3>9.2. Naming Objects With Labels <a name="9.2. Naming Objects With Labels"></a> </h3> <p style="margin-top: 1em"><font color="#000000">You can also specify an object by referring to a label. A label is a word (which must begin with a capital letter) followed by a colon; you declare it by placing it immediately before the object drawing command. For example, the program</font></p> <p style="margin-left:10%; margin-top: 1em"><font color="#000000">.PS <br> A: box "first" "object" <br> move; <br> B: ellipse "second" "object" <br> move; <br> arrow right at A .r; <br> .PE</font></p> <p style="margin-top: 1em"><font color="#000000">declares labels <b>A</b> and <b>B</b> for its first and second objects. Here’s what that looks like:</font></p> <p align="center" style="margin-top: 1em"><font color="#000000"><img src="img/pic30.png" alt="Image img/pic30.png"></font></p> <p align="center" style="margin-top: 1em"><font color="#000000">Figure 9-1: Example of label use</font></p> <p style="margin-top: 1em"><font color="#000000">The <b>at</b> statement in the fourth line uses the label <b>A</b> (the behavior of <b>at</b> is explained in the next section). We’ll see later on that labels are most useful for referring to block composite objects.</font></p> <p style="margin-top: 1em"><font color="#000000">Labels are not constants but variables (you can view colon as a sort of assignment). You can say something like <b>A: A + (1,0);</b> and the effect is to reassign the label <b>A</b> to designate a position one inch to the right of its old value.</font></p> <hr> [ <a href="pic-8.html">prev</a> | <a href="pic-10.html">next</a> | <a href="pic.html">top</a> ] <hr>
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