object MathML.MathMLVisitor.Visit(MathMLPresentationToken e, object args)
{
Area area = null;
// make an updated context
IFormattingContext context = ((IFormattingContext)args).Clone();
XmlNode node = null;
MathMLElement element = null;
MathMLNodeList contents = e.Contents;
// update the font size, pres-tokens can specify font size
context.Size = context.Evaluate(e.MathSize);
MathVariant variant = e.MathVariant;
if (variant != MathVariant.Unknown)
{
context.MathVariant = variant;
}
if (contents.Count == 1) // create a single string area
{
if ((node = e.FirstChild) != null && node.NodeType == XmlNodeType.Text)
{
area = AreaFactory.String(context, node.Value);
}
else if ((element = e.FirstChild as MathMLElement) != null)
{
// sets area to a new glyph area
area = (Area)element.Accept(formatter, context);
}
else
{
// TODO this is bad, need error handler
}
}
else // create a sequence of areas
{
Area[] areas = new Area[contents.Count];
int i = 0;
foreach (XmlNode n in contents)
{
if (n.NodeType == XmlNodeType.Text)
{
area = AreaFactory.String(context, n.Value);
}
else if ((element = n as MathMLElement) != null)
{
area = (Area)element.Accept(formatter, context);
}
areas[i++] = area;
}
area = AreaFactory.Horizontal(areas);
}
return(area.BoundingBox);
}
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);
}
/**
* grab all the cells from a table and return them in a 2 dimensional array
* TODO optimize (cache) cell.attribute* calls
*/
public static MathMLTableCellElement[][] GetCells(MathMLTableElement table)
{
int i = 0;
MathMLNodeList tableRows = table.Rows;
MathMLTableCellElement[][] cells = new MathMLTableCellElement[tableRows.Count][];
int[] remainderCols = new int[0];
ArrayList rowCellsList = new ArrayList();
foreach (MathMLTableRowElement row in tableRows)
{
MathMLNodeList rowCells = row.Cells;
rowCellsList.Clear();
foreach (MathMLTableCellElement cell in rowCells)
{
if (rowCellsList.Count < remainderCols.Length && remainderCols[rowCellsList.Count] > 0)
{
remainderCols[rowCellsList.Count] = remainderCols[rowCellsList.Count] - 1;
rowCellsList.Add(null);
}
rowCellsList.Add(cell);
for (int j = 1; j < cell.ColumnSpan; j++)
{
// deal with overlapping cells
if (rowCellsList.Count < remainderCols.Length && remainderCols[rowCellsList.Count] > 0)
{
remainderCols[rowCellsList.Count] = remainderCols[rowCellsList.Count] - 1;
}
rowCellsList.Add(null);
}
}
cells[i] = new MathMLTableCellElement[rowCellsList.Count];
for (int j = 0; j < rowCellsList.Count; j++)
{
cells[i][j] = (MathMLTableCellElement)rowCellsList[j];
}
if (remainderCols.Length < cells[i].Length)
{
int[] tmp = new int[cells[i].Length];
for (int j = 0; j < remainderCols.Length; j++)
{
tmp[j] = remainderCols[j];
}
for (int j = remainderCols.Length; j < tmp.Length; j++)
{
tmp[j] = 0;
}
remainderCols = tmp;
}
for (int j = 0; j < cells[i].Length; j++)
{
if (cells[i][j] != null)
{
Debug.Assert(remainderCols[j] == 0, "remainder columns value should be zero if we have a current cell");
remainderCols[j] = cells[i][j].RowSpan - 1;
}
}
i++; // next row
}
return(cells);
}
