Fixed issue #516. Valentina crashes when use "Point intersect line and axis" instrument.

(grafted from e1677e1a2ae3eb9ddc41033299072c6b97fb2f56)

--HG--
branch : release

ChangeLog.txt

@@ -9,6 +9,7 @@
 - [#501] Rename Window->Close Window to Window->Close pattern.
 - [#515] Seam allowance wrong way.
 - [#494] Printing is not working.
+- [#516] Valentina crashes when use "Point intersect line and axis" instrument.
 
 # Version 0.4.4 April 12, 2016
 - Updated measurement templates with all measurements. Added new template Aldrich/Women measurements.

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toollinepoint/vtoollineintersectaxis.cpp

@@ -159,9 +159,16 @@ QPointF VToolLineIntersectAxis::FindPoint(const QLineF &axis, const QLineF &line
     QPointF fPoint;
     QLineF::IntersectType intersect = axis.intersect(line, &fPoint);
     if (intersect == QLineF::UnboundedIntersection || intersect == QLineF::BoundedIntersection)
+    {
+        if(axis.angle() == line.angle() || qAbs(axis.angle() - line.angle()) == 180)
+        {
+            return QPointF();
+        }
+        else
         {
             return fPoint;
         }
+    }
     else
     {
         return QPointF();

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/vtooltriangle.cpp

@@ -186,6 +186,10 @@ QPointF VToolTriangle::FindPoint(const QPointF &axisP1, const QPointF &axisP2, c
     {
         return QPointF();
     }
+    if (axis.angle() == hypotenuse.angle() || qAbs(axis.angle() - hypotenuse.angle()) == 180)
+    {
+        return QPointF();
+    }
 
     qreal step = 1;