QSimplex: new method solver, avoinding code replication

The methods solveMin() and solveMax() had similar implementation, except
by a "-1" multiplier. This commit includes a new private method called
solver that is called by both solveMin() and solveMax().

A new enum 'solverFactor' was added admiting 2 values - Maximum (+1)
and Minimum (-1).

Signed-off-by: Anselmo Lacerda S. de Melo <anselmo.melo@openbossa.org>

2 files changed, 18 insertions, 18 deletions

diff --git a/src/gui/graphicsview/qsimplex_p.cpp b/src/gui/graphicsview/qsimplex_p.cpp
index 774af8c..b1cba45 100644
--- a/src/gui/graphicsview/qsimplex_p.cpp
+++ b/src/gui/graphicsview/qsimplex_p.cpp
@@ -306,7 +306,14 @@ bool QSimplex::iterate()
     return true;
 }
 
-qreal QSimplex::solveMin()
+/*!
+  \internal
+
+  Both solveMin and solveMax are interfaces to this method.
+
+  The enum solverFactor admits 2 values: Minimum (-1) and Maximum (+1).
+ */
+qreal QSimplex::solver(solverFactor factor)
 {
     // Remove old objective
     clearRow(0);
@@ -316,32 +323,23 @@ qreal QSimplex::solveMin()
     for (iter = objective->variables.constBegin();
          iter != objective->variables.constEnd();
          ++iter) {
-        setValueAt(0, iter.key()->index, iter.value());
+        setValueAt(0, iter.key()->index, -1 * factor * iter.value());
     }
 
     solveMaxHelper();
     collectResults();
 
-    return -1 * valueAt(0, columns - 1);
+    return factor * valueAt(0, columns - 1);
 }
 
-qreal QSimplex::solveMax()
+qreal QSimplex::solveMin()
 {
-    // Remove old objective
-    clearRow(0);
-
-    // Set new objective
-    QHash<QSimplexVariable *, qreal>::const_iterator iter;
-    for (iter = objective->variables.constBegin();
-         iter != objective->variables.constEnd();
-         ++iter) {
-        setValueAt(0, iter.key()->index, -1 * iter.value());
-    }
-
-    solveMaxHelper();
-    collectResults();
+    return solver(Minimum);
+}
 
-    return valueAt(0, columns - 1);
+qreal QSimplex::solveMax()
+{
+    return solver(Maximum);
 }
 
 void QSimplex::collectResults()
diff --git a/src/gui/graphicsview/qsimplex_p.h b/src/gui/graphicsview/qsimplex_p.h
index 3881893..dad82ce 100644
--- a/src/gui/graphicsview/qsimplex_p.h
+++ b/src/gui/graphicsview/qsimplex_p.h
@@ -88,6 +88,8 @@ private:
     // Helpers
     void clearDataStructures();
     void solveMaxHelper();
+    enum solverFactor { Minimum = -1, Maximum = 1 };
+    qreal solver(solverFactor factor);
     void collectResults();
 
     QList<QSimplexConstraint *> constraints;