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<th nowrap width="1%" height="32">P0164</th>
<th nowrap width="98%">CombineCoordinateIndex</th>
<th nowrap width="1%">21st September 2001</th>
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<p><b>Author:</b> Tobias Schiebeck, IAC
<b>Version:</b> 1.0
<b>Path:</b> iac_proj/combidx/</p>
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<h1>CombineCoordinateIndex</h1>
<h3>Synopsis</h3>
<p>
This module combines the Coordinates given as (x,y[,z]) and the dimensions of the field to calculate the index of the point in the data array.
</p>
<p>
<h4>Inputs</h4>
<table class="parameters" summary="Inputs used by CombineCoordinateIndex">
<tr>
<td width="100"><b>Name</b></td>
<td width="200"><b>Type</b></td>
<td width="425"><b>Description</b></td>
</tr>
<tr>
<td colspan="3"><hr></td>
</tr>
<tr>
<td width="100"><i>in_fld</i></td>
<td width="200">Mesh</td>
<td width="425">field that defines the dimensions</td>
</tr>
<tr>
<td colspan="3"><hr></td>
</tr>
</table>
</p>
<p>
<h4>Parameters</h4>
<h5>ReadTecplotParams</h5>
<table class="parameters" summary="Parameters used by CombineCoordinateIndex">
<tr>
<td width="100"><b>Name</b></td>
<td width="200"><b>Type</b></td>
<td width="300"><b>Description</b></td>
<td width="125"><b>UI Control</b></td>
</tr>
<tr>
<td colspan="4"><hr></td>
</tr>
<tr>
<td width="100"><i>x_index</i></td>
<td width="200">int</td>
<td width="300">x_coordinate of Point.</td>
<td width="125">Slider</td>
</tr>
<tr>
<td width="100"><i>y_index</i></td>
<td width="200">int</td>
<td width="300">y_coordinate of Point.</td>
<td width="125">Slider</td>
</tr>
<tr>
<td width="100"><i>z_index</i></td>
<td width="200">int</td>
<td width="300">z_coordinate of Point.</td>
<td width="125">Slider</td>
</tr>
<tr>
<td width="100"><i>dims[]</i></td>
<td width="200">int[]</td>
<td width="300">dimensions of the field</td>
<td width="125">(none)</td>
</tr>
<tr>
<td colspan="4"><hr></td>
</tr>
</table>
<h4>Output Ports</h4>
<table class="parameters" summary="Output Ports used by CombineCoordinateIndex">
<tr>
<td width="100"><b>Name</b></td>
<td width="200"><b>Type</b></td>
<td width="425"><b>Description</b></td>
</tr>
<tr>
<td colspan="3"><hr></td>
</tr>
<tr>
<td width="100"><i>out</i></td>
<td width="200">int</td>
<td width="425">Index of the point in 3D </td>
</tr>
<tr>
<td colspan="3"><hr></td>
</tr>
</table>
</p>
<h3>Description</h3>
<p>
The module calculates the array index of a point in 2D/3D space. This index can be used to access the data values of the particular point. The data of each point is stored as NodeData in a linear array of values.
The CombineCoordinateIndex module generates the index for a point using the dimensions of the field the point is part of and the points coordinates.
The user_macro provides a simple user interface that allows the selection of
the point in the field using sliders.
</p>
<h3>Parameters</h3>
<h4>Inputs</h4>
<p><b><i>in_fld</i></b></p>
<p>An AVS field structure. The only part of this structure which is used is the dims[] entry. This defines the dimensions of the field in which the point is located to linearize the coordinates.</p>
<p><b><i>x_index</i></b></p>
<p>x-Coordinate of the point.</p>
<p><b><i>y_index</i></b></p>
<p>y-Coordinate of the point.</p>
<p><b><i>z_index</i></b></p>
<p>z-Coordinate of the point. (3D)</p>
<h4>Outputs</h4>
<p><b><i>out</i></b></p>
<p>The linearized index for the point in the 2D/3D field</p>
<h3>Example</h3>
<p>
The module calculates the array index of a point in a field. This can be used
if one wants to access the data value of the point (32,24,45) in a 64x32x50
data volume. This module calulates from the coordinates (32,24,45) and the dimensions array {64,32,50} the linar index 93728. This linear index is the
index of the data values for the given point in the NodeData-arrays.
</p>
<h3>Files</h3>
<p><i>iac_proj/combidx/combidx.v</i> defines the library</p>
<p><i>iac_proj/combidx/cidxmods.v</i> module definition</p>
<p><i>iac_proj/combidx/cidxmacs.v</i> macro definition</p>
<h3>Author</h3>
<p>
<pre>
Tobias Schiebeck
International AVS Centre
</pre>
</p>
<h3>Contact</h3>
<p>
<pre>
International AVS Centre
Manchester Visualization Centre
Kilburn Building
University of Manchester
Oxford Road
Manchester
United Kingdom
M13 9PL
</pre>
</p>
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