kopia lustrzana https://github.com/jaseg/gerbolyze
136 wiersze
4.7 KiB
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136 wiersze
4.7 KiB
HTML
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<title>ClipperOffset</title>
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<td class="Banner" nowrap=""><a href="../../_Body.htm" class="Banner"><img src="../../../../../Images/_Unit.gif" align="absmiddle">ClipperLib</a>
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<h1>ClipperOffset</h1>
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<br>
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<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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<td class="White">
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<pre class="brush: cpp;">
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#include "clipper.hpp"
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...
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using namespace ClipperLib;
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int main()
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{
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Path subj;
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Paths solution;
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subj <<
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IntPoint(348,257) << IntPoint(364,148) << IntPoint(362,148) <<
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IntPoint(326,241) << IntPoint(295,219) << IntPoint(258,88) <<
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IntPoint(440,129) << IntPoint(370,196) << IntPoint(372,275);
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ClipperOffset co;
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co.AddPath(subj, jtRound, etClosedPolygon);
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co.Execute(solution, -7.0);
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//draw solution ...
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DrawPolygons(solution, 0x4000FF00, 0xFF009900);
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}
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</pre>
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</tr>
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</table> <div style="clear:both"> </div> </p>
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<h2 id="Auto-Reference">Reference</h2>
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<table>
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<tr><th>Methods
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</th><th>Properties
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</th>
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<tr>
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<td colspan="2" class="White">In ClipperOffset:
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</td>
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<tr>
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<td><a href="Methods/AddPath.htm">AddPath</a>
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</td>
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<td><a href="Properties/ArcTolerance.htm">ArcTolerance</a>
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</td>
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</tr>
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<tr>
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<td><a href="Methods/AddPaths.htm">AddPaths</a>
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</td>
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<td><a href="Properties/MiterLimit.htm">MiterLimit</a>
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</td>
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</tr>
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<tr>
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<td><a href="Methods/Clear.htm">Clear</a>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td><a href="Methods/Constructor.htm">Constructor</a>
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</td>
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<td>
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</td>
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</tr>
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<tr>
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<td><a href="Methods/Execute.htm">Execute</a>
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</td>
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<td>
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</td>
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</tr>
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</table>
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<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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