1 files changed, 99 insertions, 0 deletions
diff --git a/src/3rdparty/adaptagrams/libcola/tests/constrained.cpp b/src/3rdparty/adaptagrams/libcola/tests/constrained.cpp
new file mode 100644
index 0000000..20215f7
--- /dev/null
+++ b/src/3rdparty/adaptagrams/libcola/tests/constrained.cpp
@@ -0,0 +1,99 @@
+/*
+ * vim: ts=4 sw=4 et tw=0 wm=0
+ *
+ * libcola - A library providing force-directed network layout using the 
+ *           stress-majorization method subject to separation constraints.
+ *
+ * Copyright (C) 2006-2008  Monash University
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library in the file LICENSE; if not, 
+ * write to the Free Software Foundation, Inc., 59 Temple Place, 
+ * Suite 330, Boston, MA  02111-1307  USA
+ *
+*/
+
+/** \file constrained.cpp
+ *
+ * runs constraint layout on a small graph.  nodes 0 and 3 are constrained
+ * to a vertical line
+ *
+ *
+ * Authors:
+ *   Tim Dwyer <tgdwyer@gmail.com>
+ */
+#include <iostream>
+
+#include <vector>
+#include <algorithm>
+#include <float.h>
+#include <libcola/cola.h>
+#include <libcola/output_svg.h>
+inline double getRand(double range) {
+	return range*rand()/RAND_MAX;
+}
+
+using namespace std;
+using namespace cola;
+/** 
+* \brief Determines when to terminate layout of a particular graph based
+* on a given relative tolerance. 
+*/
+int main() {
+
+	const unsigned V = 4;
+	typedef pair < unsigned, unsigned >Edge;
+	Edge edge_array[] = { Edge(0, 1), Edge(1, 2), Edge(2, 3), Edge(1, 3) };
+	unsigned E = sizeof(edge_array) / sizeof(Edge);
+	vector<Edge> es(edge_array,edge_array+E);
+	double width=100;
+	double height=100;
+	vector<vpsc::Rectangle*> rs;
+	for(unsigned i=0;i<V;i++) {
+		double x=getRand(width), y=getRand(height);
+		rs.push_back(new vpsc::Rectangle(x,x+5,y,y+5));
+	}
+	CompoundConstraints ccs;
+	AlignmentConstraint ac(vpsc::XDIM);
+	ccs.push_back(&ac);
+	ac.addShape(0,0);
+	ac.addShape(3,0);
+	// apply steepest descent layout
+	ConstrainedFDLayout alg2(rs,es,width/2);
+	alg2.setConstraints(ccs);
+	alg2.run();
+	assert(alg2.computeStress()<0.0013);
+	// the following pair of nodes should line-up
+	assert(fabs(rs[0]->getCentreX()-rs[3]->getCentreX())<0.001);
+	// reset rectangles to random positions
+	for(unsigned i=0;i<V;i++) {
+		double x=getRand(width), y=getRand(height);
+		rs[i]->moveCentre(x,y);
+	}
+	// apply scaled majorization layout
+	ConstrainedMajorizationLayout alg(rs,es,nullptr,width/2);
+	alg.setConstraints(&ccs);
+	alg.setScaling(true);
+	alg.run();
+	// the following pair of nodes should line-up
+	assert(fabs(rs[0]->getCentreX()-rs[3]->getCentreX())<0.001);
+	cout<<rs[0]->getCentreX()<<","<<rs[3]->getCentreX()<<endl;
+	OutputFile output(rs,es,nullptr,"constrained.svg");
+	output.rects=true;
+	output.generate();
+
+	for(unsigned i=0;i<V;i++) {
+		delete rs[i];
+	}
+    return 0;
+}