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<p>Projection parameters.
<a href="structprjprm.html#details">More...</a></p>
<p><code>#include <<a class="el" href="prj_8h_source.html">prj.h</a>></code></p>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-attribs" name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr class="memitem:ad304d66b3f3aa64fe9c7251d3c420d02" id="r_ad304d66b3f3aa64fe9c7251d3c420d02"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#ad304d66b3f3aa64fe9c7251d3c420d02">flag</a></td></tr>
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<tr class="memitem:a3894c2e551929b29adce50cd637fa351" id="r_a3894c2e551929b29adce50cd637fa351"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#a3894c2e551929b29adce50cd637fa351">r0</a></td></tr>
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<tr class="memitem:a699ad609ff7c1935d8fb6a457a5b8164" id="r_a699ad609ff7c1935d8fb6a457a5b8164"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#a699ad609ff7c1935d8fb6a457a5b8164">phi0</a></td></tr>
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<tr class="memitem:a30e78bb110dc7a8ad0303370ce20762c" id="r_a30e78bb110dc7a8ad0303370ce20762c"><td class="memItemLeft" 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#a30e78bb110dc7a8ad0303370ce20762c">err</a></td></tr>
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<tr class="memitem:aeef644ffeafea16e82b2b995a470a345" id="r_aeef644ffeafea16e82b2b995a470a345"><td class="memItemLeft" align="right" valign="top">int(* </td><td class="memItemRight" valign="bottom"><a class="el" href="structprjprm.html#aeef644ffeafea16e82b2b995a470a345">prjx2s</a> )(<a class="el" href="prj_8h.html#a37ad31c5d2926862d211db0d14f401f0">PRJX2S_ARGS</a>)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Projection parameters. </p>
<p>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. </p>
</div><h2 class="groupheader">Field Documentation</h2>
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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>
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<a class="el" href="structprjprm.html#a4f3c364f16d0b6498d7e11e6bb67239c">prjprm::code</a>, </li>
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<a class="el" href="structprjprm.html#a3894c2e551929b29adce50cd637fa351">prjprm::r0</a>, </li>
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<a class="el" href="structprjprm.html#a46d6928a9026e7b3376dcf0d3f91db64">prjprm::pv</a>[], </li>
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<a class="el" href="structprjprm.html#a699ad609ff7c1935d8fb6a457a5b8164">prjprm::phi0</a>, </li>
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<a class="el" href="structprjprm.html#ae91fa3ff034b1c6de3ec98d8fb9e0ab1">prjprm::theta0</a>. </li>
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<p>This signals the initialization routine (<a class="el" href="prj_8h.html#ad43dbc765c63162d0af2b9285b8a434f" 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>
<p>Note that flag need not be reset when <a class="el" href="structprjprm.html#ab8dd3d8b1e462a2b261fc9e304885943">prjprm::bounds</a> is changed. </p>
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<p>(<em>Given</em>) Three-letter projection code defined by the FITS standard. </p>
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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 <picture><source srcset="form_31_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$180^\circ/\pi$" src="form_31.png" width="38" height="14"/></picture> (the value for FITS WCS). </p>
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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>
<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. </p>
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<p>(<em>Given</em>) The native longitude, <picture><source srcset="form_3_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$\phi_0$" src="form_3.png" width="13" height="13"/></picture> [deg], and ... </p>
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<p>(<em>Given</em>) ... the native latitude, <picture><source srcset="form_4_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$\theta_0$" src="form_4.png" width="10" height="13"/></picture> [deg], of the reference point, i.e. the point <picture><source srcset="form_0_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$(x,y)$" src="form_0.png" width="28" height="14"/></picture> = (0,0). If undefined (set to a magic value by <a class="el" href="prj_8h.html#ad994cb23871c51b20754973bef180f8a" title="Default constructor for the prjprm struct.">prjini()</a>) the initialization routine will set this to a projection-specific default. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab8dd3d8b1e462a2b261fc9e304885943">◆ </a></span>bounds</h2>
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<p>(<em>Given</em>) Controls bounds checking. If bounds&1 then enable strict bounds checking for the spherical-to-Cartesian (s2x) transformation 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. If bounds&2 then enable strict bounds checking for the Cartesian-to-spherical transformation (x2s) for the <code><b>HPX</b></code> and XPH projections. If bounds&4 then the Cartesian- to-spherical transformations (x2s) will invoke <a class="el" href="prj_8h.html#a7b8c7d246d49aa143a133262dc4f96be" title="Bounds checking on native coordinates.">prjbchk()</a> to perform bounds checking on the computed native coordinates, with a tolerance set to suit each projection. bounds is set to 7 by <a class="el" href="prj_8h.html#ad994cb23871c51b20754973bef180f8a" title="Default constructor for the prjprm struct.">prjini()</a> by default which enables all checks. Zero it to disable all checking.</p>
<p>It is not necessary to reset the <b>prjprm</b> struct (via <a class="el" href="prj_8h.html#ad43dbc765c63162d0af2b9285b8a434f" title="Generic setup routine for the prjprm struct.">prjset()</a> or <b>???set()</b>) when <a class="el" href="structprjprm.html#ab8dd3d8b1e462a2b261fc9e304885943">prjprm::bounds</a> is changed.</p>
<p>The remaining members of the <b>prjprm</b> struct are maintained by the setup routines and must not be modified elsewhere: </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab165b11d417700de0a4187f133050a2b">◆ </a></span>name</h2>
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<p>(<em>Returned</em>) Long name of the projection.</p>
<p>Provided for information only, not used by the projection routines. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#af0fcebbc8155f0b1ee868e64a2ed9ac3">◆ </a></span>category</h2>
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<p>(<em>Returned</em>) Projection category matching the value of the relevant global variable:</p>
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<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. </p><div class="fragment"><div class="line"><span class="keyword">struct </span><a class="code hl_struct" href="structprjprm.html">prjprm</a> prj;</div>
<div class="line"> ...</div>
<div class="line">printf(<span class="stringliteral">"%s\n"</span>, <a class="code hl_variable" href="prj_8h.html#a9bceed17f625eb88a0826871dc8296b5">prj_categories</a>[prj.category]);</div>
<div class="ttc" id="aprj_8h_html_a9bceed17f625eb88a0826871dc8296b5"><div class="ttname"><a href="prj_8h.html#a9bceed17f625eb88a0826871dc8296b5">prj_categories</a></div><div class="ttdeci">const char prj_categories[9][32]</div><div class="ttdoc">Projection categories.</div></div>
<div class="ttc" id="astructprjprm_html"><div class="ttname"><a href="structprjprm.html">prjprm</a></div><div class="ttdoc">Projection parameters.</div><div class="ttdef"><b>Definition</b> prj.h:698</div></div>
</div><!-- fragment --><p>Provided for information only, not used by the projection routines. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#abcd2a3ee9f61b930d23bf741cea63bf3">◆ </a></span>pvrange</h2>
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<p>(<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>
<p>Provided for information only, not used by the projection routines. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#afecdd175932cbf29fcfac575b1a5cb9b">◆ </a></span>simplezen</h2>
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<p>(<em>Returned</em>) True if the projection is a radially-symmetric zenithal projection.</p>
<p>Provided for information only, not used by the projection routines. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab3e207e26d1c9db06cedba2cf4460340">◆ </a></span>equiareal</h2>
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<p>(<em>Returned</em>) True if the projection is equal area.</p>
<p>Provided for information only, not used by the projection routines. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ad7a41e3d03cb739c2a9aa1f8aabf54f9">◆ </a></span>conformal</h2>
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<p>(<em>Returned</em>) True if the projection is conformal.</p>
<p>Provided for information only, not used by the projection routines. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ae634b0747fe55f77e65b6909c94227d9">◆ </a></span>global</h2>
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<p>(<em>Returned</em>) True if the projection can represent the whole sphere in a finite, non-overlapped mapping.</p>
<p>Provided for information only, not used by the projection routines. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a62e88bd3c9e02f38193a800035b83918">◆ </a></span>divergent</h2>
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<p>(<em>Returned</em>) True if the projection diverges in latitude.</p>
<p>Provided for information only, not used by the projection routines. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aae2c61d85c72e87f4b2b77a14c8eb316">◆ </a></span>x0</h2>
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<p>(<em>Returned</em>) The offset in <picture><source srcset="form_32_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$x$" src="form_32.png" width="8" height="6"/></picture>,and ... </p>
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<p>(<em>Returned</em>) ... the offset in <picture><source srcset="form_33_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$y$" src="form_33.png" width="8" height="9"/></picture> used to force <picture><source srcset="form_0_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$(x,y)$" src="form_0.png" width="28" height="14"/></picture> = (0,0) at ( <picture><source srcset="form_3_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$\phi_0$" src="form_3.png" width="13" height="13"/></picture>, <picture><source srcset="form_4_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$\theta_0$" src="form_4.png" width="10" height="13"/></picture>). </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a30e78bb110dc7a8ad0303370ce20762c">◆ </a></span>err</h2>
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<p>(<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#a1691b8bd184d40ca6fda255be078fa53" title="Enable/disable error messaging.">wcserr_enable()</a>. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a75cda8ae364a914f64e119ba859c8372">◆ </a></span>padding</h2>
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<p>(An unused variable inserted for alignment purposes only.) </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3b40a2df3b436c4ffcf5be6814993278">◆ </a></span>w</h2>
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<p>(<em>Returned</em>) Intermediate floating-point values derived from the projection parameters, cached here to save recomputation.</p>
<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. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#afb805c40a4d37c195074c1305874d615">◆ </a></span>m</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aab36c6218a33025ac4c5025de7c67d42">◆ </a></span>n</h2>
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<p>(<em>Returned</em>) Intermediate integer value (used only for the <code><b>ZPN</b></code> and <code><b>HPX</b></code> projections). </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aeef644ffeafea16e82b2b995a470a345">◆ </a></span>prjx2s</h2>
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<p>(<em>Returned</em>) Pointer to the spherical projection ... </p>
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<h2 class="memtitle"><span class="permalink"><a href="#ae699a5fb02198777343057972e1452d0">◆ </a></span>prjs2x</h2>
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<p>(<em>Returned</em>) ... and deprojection routines. </p>
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