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<div class="wimsbody">
<h1>
Logotip stre¾nika WIMS
</h1>
<img src="gifs/logo-160.gif" align="middle" alt="logo"/>
<p>
The curve represents the trace of a point on a disk of radius 1 rotating
inside a fixed circle of radius 3. And the deformation of the curve
represents what happens when the distance of the point towards the center of
the moving disk varies from 0 to infinity.
</p><p>
This animated logo is created by the application
!href module=tool/geometry/animtrace Tracés animés
under Wims.
</p>
<ul>
<li>Type of plotting: parametric curve in 2D.
</li><li>
Equations:
<pre>
x=(1-s)*cos(t+pi*s)+s*cos(2*t)
y=(1-s)*sin(t+pi*s)-s*sin(2*t)
</pre>
(where s is the ``sequentiel parameter'' as defined in
<span class="wims_emph">Tracés animés</span>.)
</li><li>Ranges of variables:
<pre> -1<x<1, -1<y<1, 0<t<2*pi. </pre>
</li>
</ul>
<p>You may
!href module=tool/geometry/animtrace.en&cmd=new&type=parametric2D&x1=(1-s)*cos(t+pi*s)+s*cos(2*t)&y1=(1-s)*sin(t+pi*s)-s*sin(2*t)&tleft=0&tright=2*pi&xleft=-1&xright=1&yleft=-1&yright=1&special_parm=noshow load directly these settings
into the menu of <span class="wims_emph">Tracés animés</span>
to plot it yourself.
</p>
<p class="wimstech">
Date of creation 03-27-1998, © XIAO, Gang.
</p>
<hr/>
<p class="wimscenter">
!href module=home Nazaj na zaèetno stran
</p>
</div>