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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>WCSLIB 4.8.2: prjprm Struct Reference</title>
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<h1>prjprm Struct Reference</h1><!-- doxytag: class="prjprm" -->Projection parameters.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="prj_8h-source.html">prj.h</a>></code>
<p>
<table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Data Fields</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#d304d66b3f3aa64fe9c7251d3c420d02">flag</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#4f3c364f16d0b6498d7e11e6bb67239c">code</a> [4]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#3894c2e551929b29adce50cd637fa351">r0</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#46d6928a9026e7b3376dcf0d3f91db64">pv</a> [PVN]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#699ad609ff7c1935d8fb6a457a5b8164">phi0</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#e91fa3ff034b1c6de3ec98d8fb9e0ab1">theta0</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#b8dd3d8b1e462a2b261fc9e304885943">bounds</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#b165b11d417700de0a4187f133050a2b">name</a> [40]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#f0fcebbc8155f0b1ee868e64a2ed9ac3">category</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#bcd2a3ee9f61b930d23bf741cea63bf3">pvrange</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#fecdd175932cbf29fcfac575b1a5cb9b">simplezen</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#b3e207e26d1c9db06cedba2cf4460340">equiareal</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#d7a41e3d03cb739c2a9aa1f8aabf54f9">conformal</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#e634b0747fe55f77e65b6909c94227d9">global</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#62e88bd3c9e02f38193a800035b83918">divergent</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#ae2c61d85c72e87f4b2b77a14c8eb316">x0</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#164706f09314c493c7e9d2c7325f8372">y0</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structwcserr.html">wcserr</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#30e78bb110dc7a8ad0303370ce20762c">err</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#36fa82794133f84373606b1f692ce8c4">padding</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#3b40a2df3b436c4ffcf5be6814993278">w</a> [10]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#fb805c40a4d37c195074c1305874d615">m</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#ab36c6218a33025ac4c5025de7c67d42">n</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#eef644ffeafea16e82b2b995a470a345">prjx2s</a> )(PRJX2S_ARGS)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#e699a5fb02198777343057972e1452d0">prjs2x</a> )(PRJS2X_ARGS)</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
The <b>prjprm</b> struct contains all information needed to project or deproject native spherical coordinates. It consists of certain members that must be set by the user (<em>given</em>) and others that are set by the WCSLIB routines (<em>returned</em>). Some of the latter are supplied for informational purposes while others are for internal use only. <hr><h2>Field Documentation</h2>
<a class="anchor" name="d304d66b3f3aa64fe9c7251d3c420d02"></a><!-- doxytag: member="prjprm::flag" ref="d304d66b3f3aa64fe9c7251d3c420d02" args="" -->
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<td class="memname">int <a class="el" href="structprjprm.html#d304d66b3f3aa64fe9c7251d3c420d02">prjprm::flag</a> </td>
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<p>
(Given and returned) This flag must be set to zero whenever any of the following <b>prjprm</b> struct members are set or changed:<p>
<ul>
<li>
<a class="el" href="structprjprm.html#4f3c364f16d0b6498d7e11e6bb67239c">prjprm::code</a>, </li>
<li>
<a class="el" href="structprjprm.html#3894c2e551929b29adce50cd637fa351">prjprm::r0</a>, </li>
<li>
<a class="el" href="structprjprm.html#46d6928a9026e7b3376dcf0d3f91db64">prjprm::pv</a>[], </li>
<li>
<a class="el" href="structprjprm.html#699ad609ff7c1935d8fb6a457a5b8164">prjprm::phi0</a>, </li>
<li>
<a class="el" href="structprjprm.html#e91fa3ff034b1c6de3ec98d8fb9e0ab1">prjprm::theta0</a>. </li>
</ul>
<p>
This signals the initialization routine (<a class="el" href="prj_8h.html#d43dbc765c63162d0af2b9285b8a434f" title="Generic setup routine for the prjprm struct.">prjset()</a> or <b>???set()</b>) to recompute the returned members of the <b>prjprm</b> struct. flag will then be reset to indicate that this has been done.<p>
Note that flag need not be reset when <a class="el" href="structprjprm.html#b8dd3d8b1e462a2b261fc9e304885943">prjprm::bounds</a> is changed.
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<a class="anchor" name="4f3c364f16d0b6498d7e11e6bb67239c"></a><!-- doxytag: member="prjprm::code" ref="4f3c364f16d0b6498d7e11e6bb67239c" args="[4]" -->
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<td class="memname">char <a class="el" href="structprjprm.html#4f3c364f16d0b6498d7e11e6bb67239c">prjprm::code</a> </td>
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<p>
(<em>Given</em>) Three-letter projection code defined by the FITS standard.
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<a class="anchor" name="3894c2e551929b29adce50cd637fa351"></a><!-- doxytag: member="prjprm::r0" ref="3894c2e551929b29adce50cd637fa351" args="" -->
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<td class="memname">double <a class="el" href="structprjprm.html#3894c2e551929b29adce50cd637fa351">prjprm::r0</a> </td>
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<p>
(<em>Given</em>) The radius of the generating sphere for the projection, a linear scaling parameter. If this is zero, it will be reset to its default value of <img class="formulaInl" alt="$180^\circ/\pi$" src="form_29.png"> (the value for FITS WCS).
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<a class="anchor" name="46d6928a9026e7b3376dcf0d3f91db64"></a><!-- doxytag: member="prjprm::pv" ref="46d6928a9026e7b3376dcf0d3f91db64" args="[PVN]" -->
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<td class="memname">double <a class="el" href="structprjprm.html#46d6928a9026e7b3376dcf0d3f91db64">prjprm::pv</a> </td>
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<p>
(<em>Given</em>) Projection parameters. These correspond to the <code><b>PV</b>i<b>_</b>ma</code> keywords in FITS, so pv[0] is <code><b>PV</b>i<b>_0</b>a</code>, pv[1] is <code><b>PV</b>i<b>_1</b>a</code>, etc., where <code>i</code> denotes the latitude-like axis. Many projections use pv[1] (<code><b>PV</b>i<b>_1</b>a</code>), some also use pv[2] (<code><b>PV</b>i<b>_2</b>a</code>) and <code><b>SZP</b></code> uses pv[3] (<code><b>PV</b>i<b>_3</b>a</code>). <code><b>ZPN</b></code> is currently the only projection that uses any of the others.<p>
Usage of the pv[] array as it applies to each projection is described in the prologue to each trio of projection routines in prj.c.
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<a class="anchor" name="699ad609ff7c1935d8fb6a457a5b8164"></a><!-- doxytag: member="prjprm::phi0" ref="699ad609ff7c1935d8fb6a457a5b8164" args="" -->
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<td class="memname">double <a class="el" href="structprjprm.html#699ad609ff7c1935d8fb6a457a5b8164">prjprm::phi0</a> </td>
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<p>
(<em>Given</em>) The native longitude, <img class="formulaInl" alt="$\phi_0$" src="form_3.png"> [deg], and ...
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<a class="anchor" name="e91fa3ff034b1c6de3ec98d8fb9e0ab1"></a><!-- doxytag: member="prjprm::theta0" ref="e91fa3ff034b1c6de3ec98d8fb9e0ab1" args="" -->
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<td class="memname">double <a class="el" href="structprjprm.html#e91fa3ff034b1c6de3ec98d8fb9e0ab1">prjprm::theta0</a> </td>
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<p>
(<em>Given</em>) ... the native latitude, <img class="formulaInl" alt="$\theta_0$" src="form_4.png"> [deg], of the reference point, i.e. the point <img class="formulaInl" alt="$(x,y)$" src="form_0.png"> = (0,0). If undefined (set to a magic value by <a class="el" href="prj_8h.html#d994cb23871c51b20754973bef180f8a" title="Default constructor for the prjprm struct.">prjini()</a>) the initialization routine will set this to a projection-specific default.
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<a class="anchor" name="b8dd3d8b1e462a2b261fc9e304885943"></a><!-- doxytag: member="prjprm::bounds" ref="b8dd3d8b1e462a2b261fc9e304885943" args="" -->
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<td class="memname">int <a class="el" href="structprjprm.html#b8dd3d8b1e462a2b261fc9e304885943">prjprm::bounds</a> </td>
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<p>
(<em>Given</em>) Controls strict bounds checking for the <code><b>AZP</b></code>, <code><b>SZP</b></code>, <code><b>TAN</b></code>, <code><b>SIN</b></code>, <code><b>ZPN</b></code>, and <code><b>COP</b></code> projections; set to zero to disable checking.<p>
The remaining members of the <b>prjprm</b> struct are maintained by the setup routines and must not be modified elsewhere:
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<a class="anchor" name="b165b11d417700de0a4187f133050a2b"></a><!-- doxytag: member="prjprm::name" ref="b165b11d417700de0a4187f133050a2b" args="[40]" -->
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<td class="memname">char <a class="el" href="structprjprm.html#b165b11d417700de0a4187f133050a2b">prjprm::name</a> </td>
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(<em>Returned</em>) Long name of the projection.<p>
Provided for information only, not used by the projection routines.
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<a class="anchor" name="f0fcebbc8155f0b1ee868e64a2ed9ac3"></a><!-- doxytag: member="prjprm::category" ref="f0fcebbc8155f0b1ee868e64a2ed9ac3" args="" -->
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<td class="memname">int <a class="el" href="structprjprm.html#f0fcebbc8155f0b1ee868e64a2ed9ac3">prjprm::category</a> </td>
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(<em>Returned</em>) Projection category matching the value of the relevant global variable:<p>
<ul>
<li>
ZENITHAL, </li>
<li>
CYLINDRICAL, </li>
<li>
PSEUDOCYLINDRICAL, </li>
<li>
CONVENTIONAL, </li>
<li>
CONIC, </li>
<li>
POLYCONIC, </li>
<li>
QUADCUBE, and </li>
<li>
HEALPIX. </li>
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<p>
The category name may be identified via the prj_categories character array, e.g. <div class="fragment"><pre class="fragment"> <span class="keyword">struct </span><a class="code" href="structprjprm.html" title="Projection parameters.">prjprm</a> prj;
...
printf(<span class="stringliteral">"%s\n"</span>, prj_categories[prj.category]);
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Provided for information only, not used by the projection routines.
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<a class="anchor" name="bcd2a3ee9f61b930d23bf741cea63bf3"></a><!-- doxytag: member="prjprm::pvrange" ref="bcd2a3ee9f61b930d23bf741cea63bf3" args="" -->
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(<em>Returned</em>) Range of projection parameter indices: 100 times the first allowed index plus the number of parameters, e.g. <code><b>TAN</b></code> is 0 (no parameters), <code><b>SZP</b></code> is 103 (1 to 3), and <code><b>ZPN</b></code> is 30 (0 to 29).<p>
Provided for information only, not used by the projection routines.
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<a class="anchor" name="fecdd175932cbf29fcfac575b1a5cb9b"></a><!-- doxytag: member="prjprm::simplezen" ref="fecdd175932cbf29fcfac575b1a5cb9b" args="" -->
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(<em>Returned</em>) True if the projection is a radially-symmetric zenithal projection.<p>
Provided for information only, not used by the projection routines.
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<a class="anchor" name="b3e207e26d1c9db06cedba2cf4460340"></a><!-- doxytag: member="prjprm::equiareal" ref="b3e207e26d1c9db06cedba2cf4460340" args="" -->
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<td class="memname">int <a class="el" href="structprjprm.html#b3e207e26d1c9db06cedba2cf4460340">prjprm::equiareal</a> </td>
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(<em>Returned</em>) True if the projection is equal area.<p>
Provided for information only, not used by the projection routines.
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<td class="memname">int <a class="el" href="structprjprm.html#d7a41e3d03cb739c2a9aa1f8aabf54f9">prjprm::conformal</a> </td>
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(<em>Returned</em>) True if the projection is conformal.<p>
Provided for information only, not used by the projection routines.
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<a class="anchor" name="e634b0747fe55f77e65b6909c94227d9"></a><!-- doxytag: member="prjprm::global" ref="e634b0747fe55f77e65b6909c94227d9" args="" -->
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(<em>Returned</em>) True if the projection can represent the whole sphere in a finite, non-overlapped mapping.<p>
Provided for information only, not used by the projection routines.
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<td class="memname">int <a class="el" href="structprjprm.html#62e88bd3c9e02f38193a800035b83918">prjprm::divergent</a> </td>
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<p>
(<em>Returned</em>) True if the projection diverges in latitude.<p>
Provided for information only, not used by the projection routines.
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<td class="memname">double <a class="el" href="structprjprm.html#ae2c61d85c72e87f4b2b77a14c8eb316">prjprm::x0</a> </td>
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(<em>Returned</em>) The offset in <img class="formulaInl" alt="$x$" src="form_30.png">,and ...
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<td class="memname">double <a class="el" href="structprjprm.html#164706f09314c493c7e9d2c7325f8372">prjprm::y0</a> </td>
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(<em>Returned</em>) ... the offset in <img class="formulaInl" alt="$y$" src="form_31.png"> used to force <img class="formulaInl" alt="$(x,y)$" src="form_0.png"> = (0,0) at (<img class="formulaInl" alt="$\phi_0$" src="form_3.png">,<img class="formulaInl" alt="$\theta_0$" src="form_4.png">).
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<td class="memname">struct <a class="el" href="structwcserr.html">wcserr</a> * <a class="el" href="structprjprm.html#30e78bb110dc7a8ad0303370ce20762c">prjprm::err</a><code> [read]</code> </td>
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(<em>Returned</em>) If enabled, when an error status is returned this struct contains detailed information about the error, see <a class="el" href="wcserr_8h.html#1691b8bd184d40ca6fda255be078fa53" title="Enable/disable error messaging.">wcserr_enable()</a>.<p>
void *padding (An unused variable inserted for alignment purposes only.)
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<td class="memname">void* <a class="el" href="structprjprm.html#36fa82794133f84373606b1f692ce8c4">prjprm::padding</a> </td>
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<a class="anchor" name="3b40a2df3b436c4ffcf5be6814993278"></a><!-- doxytag: member="prjprm::w" ref="3b40a2df3b436c4ffcf5be6814993278" args="[10]" -->
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<td class="memname">double <a class="el" href="structprjprm.html#3b40a2df3b436c4ffcf5be6814993278">prjprm::w</a> </td>
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(<em>Returned</em>) Intermediate floating-point values derived from the projection parameters, cached here to save recomputation.<p>
Usage of the w[] array as it applies to each projection is described in the prologue to each trio of projection routines in prj.c.
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<td class="memname">int <a class="el" href="structprjprm.html#fb805c40a4d37c195074c1305874d615">prjprm::m</a> </td>
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<a class="anchor" name="ab36c6218a33025ac4c5025de7c67d42"></a><!-- doxytag: member="prjprm::n" ref="ab36c6218a33025ac4c5025de7c67d42" args="" -->
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<td class="memname">int <a class="el" href="structprjprm.html#ab36c6218a33025ac4c5025de7c67d42">prjprm::n</a> </td>
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(<em>Returned</em>) Intermediate integer value (used only for the <code><b>ZPN</b></code> and <code><b>HPX</b></code> projections).
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<td class="memname"><a class="el" href="structprjprm.html#eef644ffeafea16e82b2b995a470a345">prjprm::prjx2s</a> </td>
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(<em>Returned</em>) Pointer to the projection ...
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<a class="anchor" name="e699a5fb02198777343057972e1452d0"></a><!-- doxytag: member="prjprm::prjs2x" ref="e699a5fb02198777343057972e1452d0" args=")(PRJS2X_ARGS)" -->
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<td class="memname"><a class="el" href="structprjprm.html#e699a5fb02198777343057972e1452d0">prjprm::prjs2x</a> </td>
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(<em>Returned</em>) ... and deprojection routines.
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