From 12b21e1d27f43deaa748419919b40b80cedd0ddd Mon Sep 17 00:00:00 2001
From: Tim Dwyer <tgdwyer@gmail.com>
Date: Wed, 12 Jul 2006 00:55:58 +0000
Subject: Previously graph layout was done using the Kamada-Kawai layout
 algorithm implemented in Boost.  I am replacing this with a custom
 implementation of a constrained stress-majorization algorithm.

The stress-majorization algorithm is more robust and has better convergence
characteristics than Kamada-Kawai, and also simple constraints can be placed
on node position (for example, to enforce downward-pointing edges, non-overlap constraints, or cluster constraints).

Another big advantage is that we no longer need Boost.

I've tested the basic functionality, but I have yet to properly handle
disconnected graphs or to properly scale the resulting layout.

This commit also includes significant refactoring... the quadratic program solver - libvpsc (Variable Placement with Separation Constraints) has been moved to src/libvpsc and the actual graph layout algorithm is in libcola.

(bzr r1394)
---
 src/removeoverlap/placement_SolveVPSC.cpp | 130 ------------------------------
 1 file changed, 130 deletions(-)
 delete mode 100755 src/removeoverlap/placement_SolveVPSC.cpp

(limited to 'src/removeoverlap/placement_SolveVPSC.cpp')

diff --git a/src/removeoverlap/placement_SolveVPSC.cpp b/src/removeoverlap/placement_SolveVPSC.cpp
deleted file mode 100755
index a9f4344c8..000000000
--- a/src/removeoverlap/placement_SolveVPSC.cpp
+++ /dev/null
@@ -1,130 +0,0 @@
-#include <jni.h>
-#include "placement_SolveVPSC.h"
-#include <stdio.h>
-#include "solve_VPSC.h"
-#include "variable.h"
-#include "constraint.h"
-#include "remove_rectangle_overlap.h"
-#include "generate-constraints.h"
-#include <assert.h>
-#include <map>
-#define MaxSize 500
-
-JNIEXPORT jdouble JNICALL Java_placement_SolveVPSC_solve
-  (JNIEnv *env, jobject obj, jobjectArray vName, jdoubleArray vWeight, jdoubleArray vDesPos, jintArray cLeft, jintArray cRight, jdoubleArray cGap, jdoubleArray vResult, jint mode)
-{
-	jsize n = env->GetArrayLength(vWeight);
-	jsize m = env->GetArrayLength(cLeft);
-	int i;
-	double *lvWeight = env->GetDoubleArrayElements(vWeight, 0);
-	double *lvDesPos = env->GetDoubleArrayElements(vDesPos, 0);
-	long *lcLeft = env->GetIntArrayElements(cLeft, 0);
-	long *lcRight = env->GetIntArrayElements(cRight, 0);
-	double *lcGap = env->GetDoubleArrayElements(cGap, 0);
-	Variable **vs=new Variable*[n];
-	Constraint **cs=new Constraint*[m];
-	for (i=0; i<n; i++) {
-		jstring lvName = (jstring)env->GetObjectArrayElement(vName, i);
-		const char *name = env->GetStringUTFChars(lvName, NULL); 
-		// once upon a time variables had real names, now you'll have to 
-		// track them by number.
-		vs[i]=new Variable(i,lvDesPos[i],lvWeight[i]);
-	}
-	for (i=0; i<m; i++) {
-		cs[i]=new Constraint(vs[lcLeft[i]],vs[lcRight[i]],lcGap[i]);
-	}
-	double cost=0;
-	VPSC vpsc(vs,n,cs,m);
-	if(mode==0) {
-		vpsc.satisfy();
-	} else {
-		vpsc.solve();
-	}
-	for (i=0; i<n; i++) {
-		double p=vs[i]->position();
-		env->SetDoubleArrayRegion(vResult, i,1,&p);
-	}
-	for (i=0; i<m; i++) {
-		delete cs[i];
-	}
-	delete [] cs;
-	for (i=0; i<n; i++) {
-		delete vs[i];
-	}
-	env->ReleaseIntArrayElements(cLeft, lcLeft, 0);
-	env->ReleaseIntArrayElements(cRight, lcRight, 0);
-	env->ReleaseDoubleArrayElements(cGap, lcGap, 0);
-	env->ReleaseDoubleArrayElements(vWeight, lvWeight, 0);
-	env->ReleaseDoubleArrayElements(vDesPos, lvDesPos, 0);
-	delete [] vs;
-	return cost;
-}
-
-static Variable **vs;
-static Constraint **cs;
-static int m,n;
-JNIEXPORT jint JNICALL Java_placement_SolveVPSC_generateXConstraints
-(JNIEnv *env, jobject obj, jdoubleArray rMinX, jdoubleArray rMaxX, jdoubleArray rMinY, jdoubleArray rMaxY, jdoubleArray rWeight) {
-	n = (int)env->GetArrayLength(rWeight);
-	Rectangle **rs=new Rectangle*[n];
-	double *ws = env->GetDoubleArrayElements(rWeight, 0);
-	double *minX = env->GetDoubleArrayElements(rMinX, 0);
-	double *maxX = env->GetDoubleArrayElements(rMaxX, 0);
-	double *minY = env->GetDoubleArrayElements(rMinY, 0);
-	double *maxY = env->GetDoubleArrayElements(rMaxY, 0);
-	for(int i=0;i<n;i++) rs[i]=new Rectangle(minX[i],maxX[i],minY[i],maxY[i]);
-	m = generateXConstraints(rs, ws, n, vs, cs, true);
-	return m;
-}
-
-JNIEXPORT jint JNICALL Java_placement_SolveVPSC_generateYConstraints
-(JNIEnv *env, jobject obj, jdoubleArray rMinX, jdoubleArray rMaxX, jdoubleArray rMinY, jdoubleArray rMaxY, jdoubleArray rWeight) {
-	n = (int)env->GetArrayLength(rWeight);
-	Rectangle **rs=new Rectangle*[n];
-	double *ws = env->GetDoubleArrayElements(rWeight, 0);
-	double *minX = env->GetDoubleArrayElements(rMinX, 0);
-	double *maxX = env->GetDoubleArrayElements(rMaxX, 0);
-	double *minY = env->GetDoubleArrayElements(rMinY, 0);
-	double *maxY = env->GetDoubleArrayElements(rMaxY, 0);
-	for(int i=0;i<n;i++) rs[i]=new Rectangle(minX[i],maxX[i],minY[i],maxY[i]);
-	m = generateYConstraints(rs, ws, n, vs, cs);
-	return m;
-}
-using namespace std;
-JNIEXPORT void JNICALL Java_placement_SolveVPSC_getConstraints
-(JNIEnv *env, jobject obj, jintArray cLeft, jintArray cRight, jdoubleArray cGap) {
-	map<Variable*,int> vmap;
-	for(int i=0;i<n;i++) {
-		vmap[vs[i]]=i;
-	}
-	
-	for(int i=0;i<m;i++) {
-		jint l=vmap[cs[i]->left];
-		jint r=vmap[cs[i]->right];
-		double g=cs[i]->gap;
-		env->SetIntArrayRegion(cLeft, i,1,&l);
-		env->SetIntArrayRegion(cRight, i,1,&r);
-		env->SetDoubleArrayRegion(cGap, i,1,&g);
-	}
-}
-JNIEXPORT void JNICALL Java_placement_SolveVPSC_removeOverlaps
-(JNIEnv *env, jobject obj, jdoubleArray rMinX, jdoubleArray rMaxX, jdoubleArray rMinY, jdoubleArray rMaxY) {
-	//assert(1==2); //break for debugging
-	n = (int)env->GetArrayLength(rMinX);
-	Rectangle **rs=new Rectangle*[n];
-	double *minX = env->GetDoubleArrayElements(rMinX, 0);
-	double *maxX = env->GetDoubleArrayElements(rMaxX, 0);
-	double *minY = env->GetDoubleArrayElements(rMinY, 0);
-	double *maxY = env->GetDoubleArrayElements(rMaxY, 0);
-	for(int i=0;i<n;i++) rs[i]=new Rectangle(minX[i],maxX[i],minY[i],maxY[i]);
-	removeRectangleOverlap(rs,n,0,0);
-	for (i=0; i<n; i++) {
-		double x=rs[i]->getMinX();
-		double y=rs[i]->getMinY();
-		env->SetDoubleArrayRegion(rMinX, i,1,&x);
-		env->SetDoubleArrayRegion(rMinY, i,1,&y);
-	}
-	delete [] rs;
-	env->ReleaseDoubleArrayElements(rMaxX, maxX, 0);
-	env->ReleaseDoubleArrayElements(rMaxY, maxY, 0);
-}
\ No newline at end of file
-- 
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