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<title>ClipperOffset</title>
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<h1>ClipperOffset</h1>
<br>
<p class="Body">The ClipperOffset class encapsulates the process of offsetting (inflating/deflating) both open and closed paths using a number of different join types and end types.<br><br> <em>(This class replaces the now deprecated OffsetPaths function which was less flexible.)</em><br><br> <b>Preconditions for offsetting:</b><br> 1. The orientations of closed paths must be consistent such that outer polygons share the same orientation, and any holes have the opposite orientation (ie non-zero filling). Open paths must be oriented with closed outer polygons.<br> 2. Polygons must not self-intersect. <br><br> <b>Limitations:</b><br> When offsetting, small artefacts may appear where polygons overlap. To avoid these artefacts, offset overlapping polygons separately.<br><br><br> <img src="../../../../../Images/offset1.png" alt="" width="310" height="314" border="0" align="right">
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<pre class="brush: cpp;">
#include "clipper.hpp"
...
using namespace ClipperLib;
int main()
{
Path subj;
Paths solution;
subj <<
IntPoint(348,257) << IntPoint(364,148) << IntPoint(362,148) <<
IntPoint(326,241) << IntPoint(295,219) << IntPoint(258,88) <<
IntPoint(440,129) << IntPoint(370,196) << IntPoint(372,275);
ClipperOffset co;
co.AddPath(subj, jtRound, etClosedPolygon);
co.Execute(solution, -7.0);
//draw solution ...
DrawPolygons(solution, 0x4000FF00, 0xFF009900);
}
</pre>
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<h2 id="Auto-Reference">Reference</h2>
<table>
<tr><th>Methods
</th><th>Properties
</th>
</tr>
<tr>
<td colspan="2" class="White">In ClipperOffset:
</td>
</tr>
<tr>
<td><a href="Methods/AddPath.htm">AddPath</a>
</td>
<td><a href="Properties/ArcTolerance.htm">ArcTolerance</a>
</td>
</tr>
<tr>
<td><a href="Methods/AddPaths.htm">AddPaths</a>
</td>
<td><a href="Properties/MiterLimit.htm">MiterLimit</a>
</td>
</tr>
<tr>
<td><a href="Methods/Clear.htm">Clear</a>
</td>
<td>
</td>
</tr>
<tr>
<td><a href="Methods/Constructor.htm">Constructor</a>
</td>
<td>
</td>
</tr>
<tr>
<td><a href="Methods/Execute.htm">Execute</a>
</td>
<td>
</td>
</tr>
</table>
<p class="Copyright" id="auto"> <br><br> Copyright ©2010-2014 Angus Johnson - Clipper 6.2.1 - Help file built on 1-November-2014 <br><br> </p>
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