File: rate.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><!-- InstanceBegin template="/visual/Templates/template.dwt" codeOutsideHTMLIsLocked="false" -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- InstanceBeginEditable name="doctitle" -->
<title>rate</title>
<!-- InstanceEndEditable -->
<!-- InstanceBeginEditable name="head" -->
<link href="VisualRef.css" rel="stylesheet" type="text/css" />
<!-- InstanceEndEditable -->
<script type="text/javascript">
<!--
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}
//-->
</script>
<link href="VisualRef.css" rel="stylesheet" type="text/css" />
</head>

<body>
<table width="800" border="0" cellpadding="0" cellspacing="0">
  <!--DWLayoutDefaultTable-->
  <tr>
    <td width="10" valign="top" bgcolor="#FFFFFF"><!--DWLayoutEmptyCell-->&nbsp;</td>
    <td width="10" height="272" valign="top" bgcolor="#DDDDDD"><p>&nbsp;</p>    </td>
    <td width="173" valign="top" bgcolor="#DDDDDD"><p class="Normal"><a href="index.html">Home</a></p>
      <p class="Normal">If you're new to Python <br />
      and VPython: <a href="VisualIntro.html">Introduction</a></p>
      <p class="Normal">A VPython <a href="VPython_Intro.pdf" target="_blank">tutorial</a></p>
      <p class="Normal"><a href="primitives.html">Pictures</a> of 3D objects</p>
      <p class="Normal">Choose a 3D object:</p>
        <select name="jumpMenu4" id="jumpMenu4" onchange="MM_jumpMenu('parent',this,0)">
          <option>Choose an object</option>
          <option value="cylinder.html">Overview</option>
          <option value="arrow.html">arrow</option>
          <option value="box.html">box</option>
          <option value="cone.html">cone</option>
          <option value="convex.html">convex</option>
          <option value="curve.html">curve</option>
          <option value="cylinder.html">cylinder</option>
          <option value="ellipsoid.html">ellipsoid</option>
          <option value="faces.html">faces</option>
          <option value="frame.html">frame</option>
          <option value="helix.html">helix</option>
          <option value="label.html">label</option>
          <option value="lights.html">lights</option>
          <option value="points.html">points</option>
          <option value="pyramid.html">pyramid</option>
          <option value="ring.html">ring</option>
          <option value="sphere.html">sphere</option>
        </select>
        
      <p class="Normal">Work with 3D objects:</p>
        <select name="jumpMenu4" id="jumpMenu5" onchange="MM_jumpMenu('parent',this,0)">
          <option>Choose an option</option>
          <option value="color.html">Color &amp; Opacity</option>
          <option value="lights.html">Lighting</option>
          <option value="materials.html">Materials &amp; Textures</option>
          <option value="defaults.html">Defaults</option>
          <option value="rate.html">Animation Speed</option>
          <option value="rotation.html">Rotations</option>
          <option value="options.html">Additional Options</option>
          <option value="delete.html">Delete an Object</option>
          <option value="float.html">3/4 = 0?</option>
        </select>
        
      <p class="Normal">Windows, Events, &amp; Files:</p>
        <select name="jumpMenu4" id="jumpMenu6" onchange="MM_jumpMenu('parent',this,0)">
          <option>Choose a topic</option>
          <option value="display.html">Windows</option>
          <option value="lights.html">Lighting</option>
          <option value="mouse.html">Mouse Events</option>
          <option value="mouse_click.html">&nbsp;&nbsp;&nbsp;Mouse Click</option>
          <option value="mouse_drag.html">&nbsp;&nbsp;&nbsp;Mouse Drag</option>
          <option value="keyboard.html">Keyboard Events</option>
          <option value="controls.html">Buttons and Sliders</option>
          <option value="files.html">Reading/Writing Files</option>
        </select>
        
      <p class="Normal"><a href="vector.html">Vector operations </a></p>
      <p class="Normal"><a href="graph.html">Graphs</a></p>
    <p class="Normal"><a href="factorial.html">factorial/combin</a></p>
    <p class="Normal">What's new in <a href="new_features.html">Visual 5</a></p>
    <p class="Normal"><a href="http://vpython.org" target="_blank">VPython web site</a><br />
      <a href="license.txt" target="_blank">Visual license</a><br />
      <a href="http://www.python.org" target="_blank">Python web site</a> <br />
      <a href="http://www.python.org/doc/2.5.2/lib/module-math.html" target="_blank">Math module</a> (sqrt etc.)<br />
    <a href="http://www.scipy.org/Documentation" target="_blank">Numpy module</a> (arrays)    </p></td>
    <td width="21" valign="top" bgcolor="#FFFFFF"><!--DWLayoutEmptyCell-->&nbsp;</td>
    <td width="586" rowspan="2" valign="top"><!-- InstanceBeginEditable name="content" -->
      <div>
        <h1 class="Heading-1"> <font color="#0000A0">Limiting the Animation Rate</font></h1>
      </div>
      <div>
        <div>
          <p class="program"> rate( frequency )</p>
          <p class="Normal"> Halts computations until 1.0/frequency seconds after the previous 
            
            call to <span class="attribute">rate()</span>.</p>
          <p class="Normal"> For example, <span class="attribute">rate(50)</span> will 
            halt computations long enough to make sure that at least 1.0/50.0 second 
            has elapsed. If this much time has already elapsed, no halt is performed. 
            If you place <span class="attribute">rate(50)</span> inside a computational 
            loop, the loop will execute at a maximum of 50 times per second, even if 
            the computer can run faster than this. This makes animations look about 
            the same on computers of different speeds, as long as the computers are 
            capable of carrying out 50 computations per second.</p>
          <!-- InstanceEndEditable --></td>
  </tr>
  <tr>
    <td height="16" colspan="4"></td>
  </tr>
</table>
</body>
<!-- InstanceEnd --></html>