object MathML.MathMLVisitor.Visit(MathMLOperatorElement e, object args)
{
return ((Area)formatter.Visit(e, args)).BoundingBox;
}
object MathML.MathMLVisitor.Visit(MathMLOperatorElement e, object args)
{
return(((Area)formatter.Visit(e, args)).BoundingBox);
}
object MathML.MathMLVisitor.Visit(MathMLOperatorElement e, object args)
{
// not sure why we have to cast this???
return(((MathMLVisitor)this).Visit((MathMLPresentationToken)e, args));
}
object MathML.MathMLVisitor.Visit(MathMLPresentationContainer e, object args)
{
IFormattingContext context = ((IFormattingContext)args).Clone();
MathMLNodeList arguments = e.Arguments;
BoundingBox extent = BoundingBox.New();
int stretchCount = 0;
// save the stretch size because stretch scope can not extend into another
// level of nesting
BoundingBox stretch = context.Stretch;
context.Stretch = BoundingBox.New();
// process all nodes that are not stretchy operators, get thier total
// extents
for (int i = 0; i < arguments.Count; i++)
{
MathMLElement element = (MathMLElement)arguments[i];
MathMLOperatorElement op = element as MathMLOperatorElement;
if (op == null || op.Stretchy == false)
{
//areas[i] = (Area)element.Accept(this, context);
extent.Append((BoundingBox)element.Accept(this, context));
}
if (op != null && op.Stretchy)
{
stretchCount++;
}
}
// if we have any elements that can be stretched, stretch them
if (stretchCount > 0)
{
if (!stretch.Defined)
{
// avail width is epsilon because stretchy glyphs were not counted in the
// width calculation
context.Stretch = BoundingBox.New(Single.Epsilon, extent.Height, extent.Depth);
}
else
{
// set the stretch size back to stretch the child elements
context.Stretch = stretch;
// calculate availible width
context.StretchWidth = context.StretchWidth - extent.Width;
if (context.Stretch.Width < 0)
{
context.StretchWidth = 0;
}
// size to stretch each width equally
context.StretchWidth = context.Stretch.Width / (float)stretchCount;
}
// process all areas that need to be stretched
for (int i = 0; i < arguments.Count; i++)
{
MathMLOperatorElement op = arguments[i] as MathMLOperatorElement;
if (op != null && op.Stretchy)
{
//areas[i] = (Area)op.Accept(this, context);
extent.Append((BoundingBox)op.Accept(this, context));
}
}
}
return(extent);
}