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<h1>vtkStreamLine Class Reference</h1><!-- doxytag: class="vtkStreamLine" --><!-- doxytag: inherits="vtkStreamer" --><code>#include &lt;<a class="el" href="a04458.html">vtkStreamLine.h</a>&gt;</code>
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Inheritance diagram for vtkStreamLine:</div>
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Collaboration diagram for vtkStreamLine:</div>
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<p>
<a href="a14766.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
generate streamline in arbitrary dataset 
<p>
<a class="el" href="a01615.html" title="generate streamline in arbitrary dataset">vtkStreamLine</a> is a filter that generates a streamline for an arbitrary dataset. A streamline is a line that is everywhere tangent to the vector field. Scalar values also are calculated along the streamline and can be used to color the line. Streamlines are calculated by integrating from a starting point through the vector field. Integration can be performed forward in time (see where the line goes), backward in time (see where the line came from), or in both directions. It also is possible to compute vorticity along the streamline. Vorticity is the projection (i.e., dot product) of the flow rotation on the velocity vector, i.e., the rotation of flow around the streamline.<p>
<a class="el" href="a01615.html" title="generate streamline in arbitrary dataset">vtkStreamLine</a> defines the instance variable StepLength. This parameter controls the time increment used to generate individual points along the streamline(s). Smaller values result in more line primitives but smoother streamlines. The StepLength instance variable is defined in terms of time (i.e., the distance that the particle travels in the specified time period). Thus, the line segments will be smaller in areas of low velocity and larger in regions of high velocity. (NOTE: This is different than the IntegrationStepLength defined by the superclass <a class="el" href="a01610.html" title="abstract object implements integration of massless particle through vector field">vtkStreamer</a>. IntegrationStepLength is used to control integration step size and is expressed as a fraction of the cell length.) The StepLength instance variable is important because subclasses of <a class="el" href="a01615.html" title="generate streamline in arbitrary dataset">vtkStreamLine</a> (e.g., <a class="el" href="a00355.html" title="generate constant-time dashed streamline in arbitrary dataset">vtkDashedStreamLine</a>) depend on this value to build their representation.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="a01610.html" title="abstract object implements integration of massless particle through vector field">vtkStreamer</a> <a class="el" href="a00355.html" title="generate constant-time dashed streamline in arbitrary dataset">vtkDashedStreamLine</a> <a class="el" href="a01616.html" title="generate points along streamer separated by constant time increment">vtkStreamPoints</a></dd></dl>
<dl class="user" compact><dt><b>Tests:</b></dt><dd><a class="el" href="c2_vtk_t_15.html#c2_vtk_t_vtkStreamLine">vtkStreamLine (Tests)</a> </dd></dl>

<p>Definition at line <a class="el" href="a04458.html#l00054">54</a> of file <a class="el" href="a04458.html">vtkStreamLine.h</a>.</p>
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<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef <a class="el" href="a01610.html">vtkStreamer</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#06b7b354aff901930081d7ba15a6da12">Superclass</a></td></tr>

<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual const char *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#fe6453179e7a6f138a083c69bdf3a77d">GetClassName</a> ()</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#f6a10bb09a9a1e400b5e88d2830d0230">IsA</a> (const char *type)</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#65898a6a07e488101f34a2e0455301fa">PrintSelf</a> (ostream &amp;os, <a class="el" href="a00869.html">vtkIndent</a> indent)</td></tr>

<tr><td colspan="2"><div class="groupHeader"></div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#6a56527c0c2eb2f85da15403177b2861">SetStepLength</a> (double)</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#1d7c4bfb4082019e35a9c3617ef02370">GetStepLength</a> ()</td></tr>

<tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#8da73f94b7169cbdcd56cb4f6349497c">IsTypeOf</a> (const char *type)</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">static <a class="el" href="a01615.html">vtkStreamLine</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#14c3dfbb3342bd682cc4d9a12a7fb65d">SafeDownCast</a> (<a class="el" href="a01084.html">vtkObject</a> *o)</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">static <a class="el" href="a01615.html">vtkStreamLine</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#994fdcdc8df8668d6e0d4644a6a579d7">New</a> ()</td></tr>

<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#55c71db6c7e6a0e62f3d455ab430e15c">vtkStreamLine</a> ()</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#3a3ac8a61dcd76717352070005e94365">~vtkStreamLine</a> ()</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#0ea373e8debcce9e857d9209858a3213">RequestData</a> (<a class="el" href="a00872.html">vtkInformation</a> *, <a class="el" href="a00895.html">vtkInformationVector</a> **, <a class="el" href="a00895.html">vtkInformationVector</a> *)</td></tr>

<tr><td colspan="2"><br><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a01615.html#4ead73d511671dd27538608b5ce22d72">StepLength</a></td></tr>

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<hr><h2>Member Typedef Documentation</h2>
<a class="anchor" name="06b7b354aff901930081d7ba15a6da12"></a><!-- doxytag: member="vtkStreamLine::Superclass" ref="06b7b354aff901930081d7ba15a6da12" args="" -->
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          <td class="memname">typedef <a class="el" href="a01610.html">vtkStreamer</a> <a class="el" href="a01610.html">vtkStreamLine::Superclass</a>          </td>
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<p>Reimplemented from <a class="el" href="a01610.html#7cfe13fe40f729fba5a9073d359d74f4">vtkStreamer</a>.</p>

<p>Reimplemented in <a class="el" href="a00355.html#b3a2b01e9f9d7c4073cdcef3e24a0430">vtkDashedStreamLine</a>.</p>

<p>Definition at line <a class="el" href="a04458.html#l00057">57</a> of file <a class="el" href="a04458.html">vtkStreamLine.h</a>.</p>

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<hr><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" name="55c71db6c7e6a0e62f3d455ab430e15c"></a><!-- doxytag: member="vtkStreamLine::vtkStreamLine" ref="55c71db6c7e6a0e62f3d455ab430e15c" args="()" -->
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          <td class="memname">vtkStreamLine::vtkStreamLine           </td>
          <td>(</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [protected]</code></td>
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<p>

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<a class="anchor" name="3a3ac8a61dcd76717352070005e94365"></a><!-- doxytag: member="vtkStreamLine::~vtkStreamLine" ref="3a3ac8a61dcd76717352070005e94365" args="()" -->
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          <td class="memname">vtkStreamLine::~vtkStreamLine           </td>
          <td>(</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [inline, protected]</code></td>
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<p>Definition at line <a class="el" href="a04458.html#l00073">73</a> of file <a class="el" href="a04458.html">vtkStreamLine.h</a>.</p>

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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="fe6453179e7a6f138a083c69bdf3a77d"></a><!-- doxytag: member="vtkStreamLine::GetClassName" ref="fe6453179e7a6f138a083c69bdf3a77d" args="()" -->
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          <td class="memname">virtual const char* vtkStreamLine::GetClassName           </td>
          <td>(</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [virtual]</code></td>
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<p>

<p>Reimplemented from <a class="el" href="a01610.html#3d54c13c87349ece870f0d345babe1e9">vtkStreamer</a>.</p>

<p>Reimplemented in <a class="el" href="a00355.html#216368c789f14e4b544e80bc562bd889">vtkDashedStreamLine</a>.</p>

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<a class="anchor" name="8da73f94b7169cbdcd56cb4f6349497c"></a><!-- doxytag: member="vtkStreamLine::IsTypeOf" ref="8da73f94b7169cbdcd56cb4f6349497c" args="(const char *type)" -->
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          <td class="memname">static int vtkStreamLine::IsTypeOf           </td>
          <td>(</td>
          <td class="paramtype">const char *&nbsp;</td>
          <td class="paramname"> <em>name</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [static]</code></td>
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Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h. 
<p>Reimplemented from <a class="el" href="a01610.html#5d7222732aa2a16079814391ac0954ec">vtkStreamer</a>.</p>

<p>Reimplemented in <a class="el" href="a00355.html#6772cdc157135d4660c1333def7788b1">vtkDashedStreamLine</a>.</p>

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<a class="anchor" name="f6a10bb09a9a1e400b5e88d2830d0230"></a><!-- doxytag: member="vtkStreamLine::IsA" ref="f6a10bb09a9a1e400b5e88d2830d0230" args="(const char *type)" -->
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          <td class="memname">virtual int vtkStreamLine::IsA           </td>
          <td>(</td>
          <td class="paramtype">const char *&nbsp;</td>
          <td class="paramname"> <em>name</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [virtual]</code></td>
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Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h. 
<p>Reimplemented from <a class="el" href="a01610.html#af8b291c822603490682a1a632bc415e">vtkStreamer</a>.</p>

<p>Reimplemented in <a class="el" href="a00355.html#8bf88fadf21709d7afd1cea22d2e3c55">vtkDashedStreamLine</a>.</p>

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<a class="anchor" name="14c3dfbb3342bd682cc4d9a12a7fb65d"></a><!-- doxytag: member="vtkStreamLine::SafeDownCast" ref="14c3dfbb3342bd682cc4d9a12a7fb65d" args="(vtkObject *o)" -->
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          <td class="memname">static <a class="el" href="a01615.html">vtkStreamLine</a>* vtkStreamLine::SafeDownCast           </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="a01084.html">vtkObject</a> *&nbsp;</td>
          <td class="paramname"> <em>o</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [static]</code></td>
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<p>Reimplemented from <a class="el" href="a01610.html#712f76c7857e9c32e1e051870977701b">vtkStreamer</a>.</p>

<p>Reimplemented in <a class="el" href="a00355.html#874f2662188092810e8c47ff52eea24f">vtkDashedStreamLine</a>.</p>

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<a class="anchor" name="65898a6a07e488101f34a2e0455301fa"></a><!-- doxytag: member="vtkStreamLine::PrintSelf" ref="65898a6a07e488101f34a2e0455301fa" args="(ostream &amp;os, vtkIndent indent)" -->
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          <td class="memname">void vtkStreamLine::PrintSelf           </td>
          <td>(</td>
          <td class="paramtype">ostream &amp;&nbsp;</td>
          <td class="paramname"> <em>os</em>, </td>
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          <td class="paramkey"></td>
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          <td class="paramtype"><a class="el" href="a00869.html">vtkIndent</a>&nbsp;</td>
          <td class="paramname"> <em>indent</em></td><td>&nbsp;</td>
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          <td></td>
          <td>)</td>
          <td></td><td></td><td><code> [virtual]</code></td>
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Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use <a class="el" href="a01085.html#edadf6378465fd81c2592ef64262e2a5">Print()</a> instead) but used in the hierarchical print process to combine the output of several classes. 
<p>Reimplemented from <a class="el" href="a01610.html#af23405031ab02ddeec593208ec2f088">vtkStreamer</a>.</p>

<p>Reimplemented in <a class="el" href="a00355.html#3c7efbb56cad8dbc3055effd7680bf23">vtkDashedStreamLine</a>.</p>

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<a class="anchor" name="994fdcdc8df8668d6e0d4644a6a579d7"></a><!-- doxytag: member="vtkStreamLine::New" ref="994fdcdc8df8668d6e0d4644a6a579d7" args="()" -->
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          <td class="memname">static <a class="el" href="a01615.html">vtkStreamLine</a>* vtkStreamLine::New           </td>
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Construct object with step size set to 1.0. 
<p>Reimplemented from <a class="el" href="a01261.html#cf785ac526132296ff652c636f713b5e">vtkPolyDataAlgorithm</a>.</p>

<p>Reimplemented in <a class="el" href="a00355.html#913f1f9f77a499f6accb9f4b1dfee35b">vtkDashedStreamLine</a>.</p>

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<a class="anchor" name="6a56527c0c2eb2f85da15403177b2861"></a><!-- doxytag: member="vtkStreamLine::SetStepLength" ref="6a56527c0c2eb2f85da15403177b2861" args="(double)" -->
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          <td class="memname">virtual void vtkStreamLine::SetStepLength           </td>
          <td>(</td>
          <td class="paramtype">double&nbsp;</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td><code> [virtual]</code></td>
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Specify the length of a line segment. The length is expressed in terms of elapsed time. Smaller values result in smoother appearing streamlines, but greater numbers of line primitives. 
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<a class="anchor" name="1d7c4bfb4082019e35a9c3617ef02370"></a><!-- doxytag: member="vtkStreamLine::GetStepLength" ref="1d7c4bfb4082019e35a9c3617ef02370" args="()" -->
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          <td class="memname">virtual double vtkStreamLine::GetStepLength           </td>
          <td>(</td>
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          <td>&nbsp;)&nbsp;</td>
          <td><code> [virtual]</code></td>
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Specify the length of a line segment. The length is expressed in terms of elapsed time. Smaller values result in smoother appearing streamlines, but greater numbers of line primitives. 
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<a class="anchor" name="0ea373e8debcce9e857d9209858a3213"></a><!-- doxytag: member="vtkStreamLine::RequestData" ref="0ea373e8debcce9e857d9209858a3213" args="(vtkInformation *, vtkInformationVector **, vtkInformationVector *)" -->
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          <td class="memname">virtual int vtkStreamLine::RequestData           </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="a00872.html">vtkInformation</a> *&nbsp;</td>
          <td class="paramname"> <em>request</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="a00895.html">vtkInformationVector</a> **&nbsp;</td>
          <td class="paramname"> <em>inputVector</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="a00895.html">vtkInformationVector</a> *&nbsp;</td>
          <td class="paramname"> <em>outputVector</em></td><td>&nbsp;</td>
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          <td>)</td>
          <td></td><td></td><td><code> [protected, virtual]</code></td>
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This is called by the superclass. This is the method you should override. 
<p>Reimplemented from <a class="el" href="a01261.html#6b5a43ab1f9bbcb368c7dc83e4afe068">vtkPolyDataAlgorithm</a>.</p>

<p>Reimplemented in <a class="el" href="a00355.html#65b6754ab28a0dab82ae412ef5bfc64e">vtkDashedStreamLine</a>.</p>

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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="4ead73d511671dd27538608b5ce22d72"></a><!-- doxytag: member="vtkStreamLine::StepLength" ref="4ead73d511671dd27538608b5ce22d72" args="" -->
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          <td class="memname">double <a class="el" href="a01615.html#4ead73d511671dd27538608b5ce22d72">vtkStreamLine::StepLength</a><code> [protected]</code>          </td>
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<p>Definition at line <a class="el" href="a04458.html#l00079">79</a> of file <a class="el" href="a04458.html">vtkStreamLine.h</a>.</p>

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<hr>The documentation for this class was generated from the following file:<ul>
<li>dox/Graphics/<a class="el" href="a04458.html">vtkStreamLine.h</a></ul>
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<hr size="1"><address style="text-align: right;"><small>Generated on Wed Jun 3 19:36:39 2009 for VTK by&nbsp;
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