// (i-j)*(i-j)*coefficient is added to the goal
static void AddGoalTwoNodesAreClose(VariableDef i, VariableDef j, double weight)
{
SfServ.Decision x = GetOrCreateDecision(i);
SfServ.Decision y = GetOrCreateDecision(j);
SfServ.Term term = weight * (x * x - 2 * x * y + y * y);
AddTermToGoalTerm(term);
}
static SfServ.Decision GetOrCreateDecision(VariableDef varDef)
{
if (null == varDef.VariableX)
{
var d = new SfServ.Decision(SfServ.Domain.Real, varDef.Ordinal.ToString());
varDef.VariableX = new SfVariable(d);
model.AddDecision(d);
return(d);
}
return(((SfVariable)varDef.VariableX).Decision);
}
// meaning that we would like position i at "position"
static void AddNodeWithIdealPosition(VariableDef varDef)
{
double weight = varDef.WeightX;
double position = varDef.DesiredPosX;
SfServ.Decision x = GetOrCreateDecision(varDef);
//adding the term (ix-pos)^2; workaround for bug processing x(x - 2*position)
SfServ.Term term = weight * (x * x - 2 * position * x);
//model.AddConstraint(varDef.Ordinal.ToString() + "ttt", x >= -100000.0); // TODO: hack to make the solver happy - fix it later!!!!
AddTermToGoalTerm(term);
return;
}
// leftNode+gap leq RightNode
static void AddLeftRightSeparationConstraint(VariableDef leftNode, VariableDef rightNode, double gap, bool isEquality)
{
SfServ.Decision leftDecision = GetOrCreateDecision(leftNode);
SfServ.Decision rightDecision = GetOrCreateDecision(rightNode);
SfServ.Term term;
if (isEquality)
{
term = (leftDecision * leftNode.ScaleX) + gap == (rightDecision * rightNode.ScaleX);
}
else
{
term = (leftDecision * leftNode.ScaleX) + gap <= (rightDecision * rightNode.ScaleX);
}
Constraints.Add(model.AddConstraint(Constraints.Count.ToString(), term));
}
internal SfVariable(SfServ.Decision d)
{
this.Decision = d;
}
static SfServ.Decision GetOrCreateDecision(VariableDef varDef)
{
if (null == varDef.VariableX)
{
var d = new SfServ.Decision(SfServ.Domain.Real, varDef.Ordinal.ToString());
varDef.VariableX = new SfVariable(d);
model.AddDecision(d);
return d;
}
return ((SfVariable)varDef.VariableX).Decision;
}
internal SfVariable(SfServ.Decision d)
{
this.Decision = d;
}