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<title>IntPoint</title>
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<h1>IntPoint</h1>
<p class="Decl"><span class="Comment">Del.»</span> TIntPoint = <b>record</b> X, Y: <a href="./CInt.htm">cInt</a>; <b>end;</b></p>
<p class="Decl2"><span class="Comment">C++ »</span> <b>struct</b> IntPoint { <a href="./CInt.htm">cInt</a> X; <a href="./CInt.htm">cInt</a> Y; <b>...</b> };</p>
<p class="Decl3"><span class="Comment">C# »</span> <b>public class</b> IntPoint { <b>public</b> <a href="./CInt.htm">cInt</a> X; { get; set; } <b>public</b> <a href="./CInt.htm">cInt</a> Y; { get; set; } <b>...</b> };</p>
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<p class="Body"> The <b>IntPoint</b> structure is used to represent all vertices in the Clipper Library. An <em>integer</em> storage type has been deliberately chosen to preserve <a href="http://www.mpi-inf.mpg.de/~kettner/pub/nonrobust_cgta_06.pdf" target="_blank"><b>numerical robustness</b></a>. (Early versions of the library used floating point coordinates, but it became apparent that floating point imprecision would always cause occasional errors.)<br><br> A sequence of IntPoints are contained within a <a href="./Path.htm">Path</a> structure to represent a single contour.<br><br> As of version 6, IntPoint now has <span class="maroon">an optional third member 'Z'</span>. This can be enabled by exposing (ie uncommenting) the PreProcessor define '<a href="../PreProcessor/Defines.htm"><b>use_xyz</b></a>'. When the Z member is used, its values will be copied to corresponding verticies in solutions to clipping operations. However, at points of intersection where there's no corresponding Z value, the value will be assigned zero unless a new value is provided by a user supplied <a href="../Classes/Clipper/Properties/ZFillFunction.htm"><b>callback function</b></a>.<br><br> Users wishing to clip or offset polygons containing <em>floating point</em> coordinates need to use appropriate scaling when converting these values to and from <em>IntPoints</em>.<br><br> See also the notes on <a href="../../../Overview/Rounding.htm">rounding</a>. </p>
<h2 id="Auto-SeeAlso">See Also</h2>
<p class="Body"><a href="../../../Overview/Rounding.htm">Rounding</a>, <a href="../Classes/Clipper/Properties/ZFillFunction.htm">Clipper.ZFillFunction</a>, <a href="../PreProcessor/Defines.htm">Defines</a>, <a href="CInt.htm">CInt</a>, <a href="Path.htm">Path</a>, <a href="Paths.htm">Paths</a></p>
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