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Thank you Manfred and Ross.
<div class="">Wow, nowhere have I seen any indication that you can concatenate \psbezier commands the way you can \psline. Very elegant! (plus, it works :-)</div>
<div class="">Ziggy<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Jul 16, 2021, at 4:09, Manfred Braun <<a href="mailto:manfred.braun@uni-due.de" class="">manfred.braun@uni-due.de</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">
Hi Zbigniew and Ross,
<div class=""><br class="">
</div>
<div class="">I think it depends very much on how exactly \tear is defined. The following version works:</div>
<div class=""><br class="">
</div>
<div class="">
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class="">\newcommand\tear[3]{\psbezier</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class=""> (#1,-#1)(0,0)(0,0)(-#2,0)</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class=""> (-#3,0)(0,#3)(0,#2)</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class=""> (0,0)(0,0)(#1,-#1)</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class="">}</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class="">\newcommand\blip[5]{%</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class=""> \pscustom{\translate(#1,#2)\tear{#3}{#4}{#5}}%</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class="">}</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class="">\begin{document}</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class="">\begin{pspicture}(-5.5,-1)(5,7.5)</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class=""> \tear{1}{5}{7}</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class=""> \psset{linecolor=red} </div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class=""> \blip{4}{2}{1}{5}{7}</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;" class="">\end{pspicture}</div>
<div class=""><br class="">
</div>
<div class="">Note that the starting points of the second and third bezier arcs are omitted. \psbezier assumes implicitly that these arcs start at the current position, i.e., at the last point of the previous arc.With this definition of \tear there is no need
to wrap every arc into a \pscustom command separately, as suggested by Ross.</div>
<div class=""><br class="">
</div>
<div class="">Manfred</div>
<div class=""><br class="">
</div>
<div class="">
<blockquote type="cite" class="">
<div class="">On 16 Jul 2021, at 01:06, Ross Moore <<a href="mailto:ross.moore@mq.edu.au" class="">ross.moore@mq.edu.au</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
Hi Zbigniew,<br class="">
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On 16 Jul 2021, at 5:08 am, Nitecki, Zbigniew H. <<a href="mailto:Zbigniew.Nitecki@tufts.edu" class="">Zbigniew.Nitecki@tufts.edu</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div class="">
<div class="" style="word-wrap:break-word; line-break:after-white-space">I designed a small macro to draw a “tear”-shaped curve using \psbezier. It works as expected.
<div class="">For simplicity, I wrote it with features related to the coordinate axes.</div>
<div class="">Then, I tried to create a new macro, “blip”, which gives a translate of this picture to a specified position.</div>
<div class=""><br class="">
</div>
<div class="">I tried two options (see attached example) .</div>
<div class="">In the pdf, the lower figure is generated using just the \tear macro, while the upper one is generated using the \blip macro.</div>
<div class="">The \blip figure has some extra lines—I suspect they are caused by my use of \pscustom to create the translated picture. </div>
<div class=""> I followed the example on p. 130 of Herbert Voss’s “Pstricks” (in the English translation).</div>
<div class=""><br class="">
</div>
<div class="">I thought I could get away with just defining \blip using \tear without a \pscustom envelope, but if I comment out the \pscustom part like this:</div>
<div class="">
<blockquote type="cite" class="">
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
<span class="x_Apple-tab-span" style="white-space:pre"></span>\newcommand{\blip}[5]{%\pscustom{% usage:\blip{A}{B}{a}[b}{c} = \tear{a}{b}{c} moved so (0,0)->(A,B)</div>
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
<span class="x_Apple-tab-span" style="white-space:pre"></span>\translate(#1,#2)</div>
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
<span class="x_Apple-tab-span" style="white-space:pre"></span>\tear{#3}{#4}{#5}</div>
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
%<span class="x_Apple-tab-span" style="white-space:pre"> </span>}<span class="x_Apple-tab-span" style="white-space:pre">
</span></div>
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
<span class="x_Apple-tab-span" style="white-space:pre"></span>}</div>
</blockquote>
</div>
<div class="">
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
I get an error message, that \tear is undefined (it is still present in the file, preceding this definition).</div>
</div>
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
<br class="">
</div>
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
Can anyone suggest how I can translate the picture generated by \tear without introducing the extra lines? I know this is probably a pretty stupid issue, but I haven’t succeeded in understanding how to</div>
<div class="" style="margin:0px; font-stretch:normal; font-size:12px; line-height:normal">
do it from the LaTeX Graphics Companion (there is a complicated example involving creating nodes, etc., surely there is an easier more direct way).</div>
<div class=""><br class="">
</div>
</div>
</div>
</div>
</blockquote>
<div class=""><br class="">
</div>
<div class="">This does what you want:</div>
<div class=""><br class="">
</div>
<div class="">
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class="">\begin{pspicture}(-5,-5)(5,5)</div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"></span>\tear{1}{5}{7}</div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"></span>\pscustom{\translate(3,3)</div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"></span>\psbezier(1,-1)(0,0)(0,0)(-5,0)}%</div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"></span>\pscustom{\translate(3,3)</div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"></span>\psbezier(-5,0)(-7,0)(0,7)(0,5)}%</div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"></span>\pscustom{\translate(3,3)</div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span class="Apple-tab-span" style="white-space:pre"></span>\psbezier(0,5)(0,0)(0,0)(1,-1)}%</div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class="">\end{pspicture}</div>
<div class=""><br class="">
</div>
<div class="">So the lesson is that you need to wrap \pscustom {\translate (…} }</div>
<div class="">around *each* of the Bézier pieces separately.</div>
<div class=""><br class="">
</div>
<div class="">Probably what is happening is that the origin (or whatever is the currentpoint at the time)</div>
<div class="">is regarded as part of the Postscript path, giving you an extra straight segment at the beginning </div>
<div class="">or end of a Bézier piece. </div>
<div class="">That is, within a single \pscustom{ . . . } the different Bézier pieces combine to give </div>
<div class="">a single Postscript curve specification, drawn at the end.</div>
<div class=""><br class="">
</div>
<div class="">By breaking up the pieces into their own \pscustom {…}</div>
<div class="">you draw each piece entirely independent from the others.</div>
<div class="">(so no automatic connection between the pieces.)</div>
<div class=""><br class="">
</div>
<div class="">It is then up to you to make sure they fit together seamlessly.</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Oh, and move the \newcommand definitions outside of the {pspicture}</div>
<div class="">environment; else you have to repeat them each time you want them.</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Hope this helps.</div>
</div>
<div class=""><br class="">
</div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Ross</div>
<br class="">
<blockquote type="cite" class="">
<div class="">
<div class="">
<div class="" style="word-wrap:break-word; line-break:after-white-space"><br class="">
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Zbigniew Nitecki</font></div>
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<font face="Helvetica" size="3" class="" style="font:normal normal normal 12px/normal Helvetica">Department of Mathematics</font></div>
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<font face="Helvetica" size="3" class="" style="font:normal normal normal 12px/normal Helvetica">Tufts University</font></div>
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<font face="Helvetica" size="3" class="" style="font:normal normal normal 12px/normal Helvetica">Medford, MA 02155</font></div>
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<br class="">
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<font face="Helvetica" size="3" class="" style="font:normal normal normal 12px/normal Helvetica">telephones:</font></div>
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<font face="Helvetica" size="3" class="" style="font:normal normal normal 12px/normal Helvetica">Office<span class="x_Apple-converted-tab"> </span>(617)627-3843</font></div>
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confidential information. If you are not the</span><span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class=""> </span><span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class="">intended </span><br style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none;" class="">
<span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class="">recipient,
please delete it and notify the sender. Views</span><span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class=""> </span><span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class="">expressed </span><br style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none;" class="">
<span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class="">in
this message are those of the individual sender, and</span><span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class=""> </span><span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class="">are
not </span><br style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none;" class="">
<span style="font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: Helvetica; text-decoration: none; float: none; display: inline !important;" class="">necessarily
the views of Macquarie University.</span> </span></span></span></span></span></a></span></div>
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