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// --------------------------------------------------------------------
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// Ipelet for creating regular k-gons
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// --------------------------------------------------------------------
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This file is part of the extensible drawing editor Ipe.
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Copyright (C) 1993-2004 Otfried Cheong
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Ipe is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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As a special exception, you have permission to link Ipe with the
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CGAL library and distribute executables, as long as you follow the
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requirements of the Gnu General Public License in regard to all of
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the software in the executable aside from CGAL.
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Ipe is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with Ipe; if not, you can find it at
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"http://www.gnu.org/copyleft/gpl.html", or write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include "ipevisitor.h"
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// --------------------------------------------------------------------
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class KGonIpelet : public Ipelet {
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virtual int IpelibVersion() const { return IPELIB_VERSION; }
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virtual const char *Label() const { return "Regular k-gon"; }
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virtual void Run(int, IpePage *page, IpeletHelper *helper);
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// --------------------------------------------------------------------
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void KGonIpelet::Run(int, IpePage *page, IpeletHelper *helper)
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IpePage::iterator it = page->PrimarySelection();
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if (it == page->end() || !it->Object()->AsPath() ||
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it->Object()->AsPath()->NumSubPaths() > 1 ||
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it->Object()->AsPath()->SubPath(0)->Type() != IpeSubPath::EEllipse) {
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helper->Message("Primary selection is not a circle");
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if (!helper->GetString("Enter k (number of corners)", str))
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if (k < 3 || k > 1000)
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const IpePath *p = it->Object()->AsPath();
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const IpeEllipse *e = p->SubPath(0)->AsEllipse();
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IpeMatrix m = p->Matrix() * e->Matrix();
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IpeVector center = m.Translation();
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IpeVector v = m * IpeVector(1,0);
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double radius = (v - center).Len();
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IpeSegmentSubPath *sp = new IpeSegmentSubPath;
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double alpha = 2.0 * IpePi / k;
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IpeVector v0 = center + radius * IpeVector(1,0);
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for (int i = 0; i < k; ++i) {
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IpeVector v1 = center + radius * IpeVector(IpeAngle(i * alpha));
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sp->AppendSegment(v0, v1);
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IpePath *obj = new IpePath(helper->Attributes());
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page->push_back(IpePgObject(IpePgObject::ESecondary,
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helper->CurrentLayer(), obj));
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helper->Message("Created regular k-gon");
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// --------------------------------------------------------------------
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IPELET_DECLARE Ipelet *NewIpelet()
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return new KGonIpelet;
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// --------------------------------------------------------------------
added
removed
src/ipelets/kgon/kgon.cpp
