+
+/*virtual*/ Vector Line::GetPointAtParameter(double parameter)
+{
+ if (parameter <= 0)
+ return position;
+ else if (parameter >= 1.0)
+ return endpoint;
+
+ // Our parameter lies between zero and one, so calculate it!
+ Vector v(endpoint, position);
+ double length = v.Magnitude();
+ // We scale the magnitude of v so that it lies between 0 and 1...
+ // By multiplying the parameter by the magnitude, we obtain the point we
+ // want. No scaling necessary as it's inherent in the approach!
+ double spotOnLength = length * parameter;
+
+ // To get our point, we use the initial point of the line and add in our
+ // scaled point.
+ Vector result = position + (v * spotOnLength);
+ return result;
+}
+
+
+/*virtual*/ QRectF Line::Extents(void)
+{
+ QRectF rect(QPointF(position.x, position.y), QPointF(endpoint.x, endpoint.y));
+ return rect.normalized();
+}
+
+
+void Line::SetDimensionOnLine(Dimension * dimension/*=NULL*/)
+{
+ // If they don't pass one in, create it for the caller.
+ if (dimension == NULL)
+ {
+//printf("Line::SetDimensionOnLine(): Creating new dimension...\n");
+// dimension = new Dimension(position, endpoint, DTLinear, this);
+ dimension = new Dimension(Connection(this, 0), Connection(this, 1.0), DTLinear, this);
+
+ if (parent)
+//{
+//printf("Line::SetDimensionOnLine(): Adding to parent...\n");
+ parent->Add(dimension);
+//}
+ }
+ else
+ {
+ dimension->Connect(this, 0);
+ dimension->Connect(this, 1.0);
+ }
+
+ // Make sure the Dimension is connected to us...
+ Connect(dimension, 0);
+ Connect(dimension, 1.0);
+}
+
+
+Object * Line::FindAttachedDimension(void)
+{
+ // Is there anything connected to this line? If not, return NULL
+ if (connected.size() < 2)
+ return NULL;
+
+ // Otherwise, we have to search our objects to see if there's a likely
+ // candidate. In this case, we're looking for a pointer to the same object
+ // with a parameter of 0 and 1 respectively. This is O((n^2)/2).
+ for(uint i=0; i<connected.size(); i++)
+ {
+ for(uint j=i+1; j<connected.size(); j++)
+ {
+//printf("Line: connected[i]=%X, connected[j]=%X, connected[i].t=%lf, connected[j].t=%lf\n", connected[i].object, connected[j].object, connected[i].t, connected[j].t);
+ if ((connected[i].object == connected[j].object)
+ && ((connected[i].t == 0 && connected[j].t == 1.0)
+ || (connected[i].t == 1.0 && connected[j].t == 0)))
+ return connected[i].object;
+ }
+ }
+
+ // Didn't find anything, so return NULL
+ return NULL;
+}
+
+
+void Line::SaveState(void)
+{
+ oldHitPoint1 = hitPoint1;
+ oldHitPoint2 = hitPoint2;
+ oldHitLine = hitLine;
+}
+
+
+bool Line::StateChanged(void)
+{
+ if ((hitPoint1 != oldHitPoint1) || (hitPoint2 != oldHitPoint2) || (hitLine != oldHitLine))
+ return true;
+
+ return false;
+}
+
+