public static XElement DrawImage(MathNode node)
{
//Top-level draw function: prepare the canvas, then call the draw method of the root node
double baseline = 0;
if (node.AlignToAxis)
baseline = node.Axis();
double height = Math.Max(node.Height, node.Ascender);
double depth = Math.Max(node.Depth, node.Descender);
double vsize = height + depth;
Dictionary<string, string> attrs = new Dictionary<string, string>(){
{"width", string.Format("{0:F6}pt", node.Width)},
{"height", string.Format("{0:F6}pt", vsize)},
{"viewBox", string.Format("0 {0:F6} {1:F6} {2:F6}", (-(height+baseline)), node.Width, vsize)}
};
XElement nodeElement = creatElement("svg", attrs);
nodeElement.SetAttributeValue(XNamespace.Xmlns + "svg", SvgNs.NamespaceName);
nodeElement.SetAttributeValue(XNamespace.Xmlns + "svgmath", SvgMathNs.NamespaceName);
XElement metadataElement = creatElement("metadata", null, false);
XElement metricElement = creatElement("metrics", new Dictionary<string, string>(){
{"baseline", string.Format("{0}", depth - baseline)},
{"axis", string.Format("{0}", depth - baseline + node.Axis())},
{"top", string.Format("{0}", depth + node.Height)},
{"bottom", string.Format("{0}", depth - node.Depth)}
}, true);
metadataElement.Add(metricElement);
nodeElement.Add(metadataElement);
DrawTranslatedNode(node, nodeElement, 0, -baseline);
return nodeElement;
}
public static double Adjustment(MathNode script)
{
if (script.AlignToAxis)
{
return(script.Axis());
}
else
{
return(0);
}
}
public static void GMRow(MathNode node, XElement output)
{
DrawBox(node, output);
if (node.Children.Count == 0)
return;
double offset = -node.Children.First().LeftSpace;
foreach (MathNode ch in node.Children)
{
offset += ch.LeftSpace;
double baseline = 0;
if (ch.AlignToAxis && !node.AlignToAxis) //ToDo: might not behave the same as Python since aligntoaxis might be none
baseline = -node.Axis();
DrawTranslatedNode(ch, output, offset, baseline);
offset += ch.Width + ch.RightSpace;
}
}
public static XElement DrawImage(MathNode node)
{
//Top-level draw function: prepare the canvas, then call the draw method of the root node
double baseline = 0;
if (node.AlignToAxis)
{
baseline = node.Axis();
}
double height = Math.Max(node.Height, node.Ascender);
double depth = Math.Max(node.Depth, node.Descender);
double vsize = height + depth;
Dictionary <string, string> attrs = new Dictionary <string, string>()
{
{ "width", string.Format(CultureInfo.InvariantCulture, "{0:F6}pt", node.Width) },
{ "height", string.Format(CultureInfo.InvariantCulture, "{0:F6}pt", vsize) },
{ "viewBox", string.Format(CultureInfo.InvariantCulture, "0 {0:F6} {1:F6} {2:F6}", (-(height + baseline)), node.Width, vsize) }
};
XElement nodeElement = creatElement("svg", attrs);
nodeElement.SetAttributeValue(XNamespace.Xmlns + "svg", SvgNs.NamespaceName);
nodeElement.SetAttributeValue(XNamespace.Xmlns + "svgmath", SvgMathNs.NamespaceName);
XElement metadataElement = creatElement("metadata", null, false);
XElement metricElement = creatElement("metrics", new Dictionary <string, string>()
{
{ "baseline", string.Format(CultureInfo.InvariantCulture, "{0}", depth - baseline) },
{ "axis", string.Format(CultureInfo.InvariantCulture, "{0}", depth - baseline + node.Axis()) },
{ "top", string.Format(CultureInfo.InvariantCulture, "{0}", depth + node.Height) },
{ "bottom", string.Format(CultureInfo.InvariantCulture, "{0}", depth - node.Depth) }
}, true);
metadataElement.Add(metricElement);
nodeElement.Add(metadataElement);
DrawTranslatedNode(node, nodeElement, 0, -baseline);
return(nodeElement);
}
public static void GMRow(MathNode node, XElement output)
{
DrawBox(node, output);
if (node.Children.Count == 0)
{
return;
}
double offset = -node.Children.First().LeftSpace;
foreach (MathNode ch in node.Children)
{
offset += ch.LeftSpace;
double baseline = 0;
if (ch.AlignToAxis && !node.AlignToAxis) //ToDo: might not behave the same as Python since aligntoaxis might be none
{
baseline = -node.Axis();
}
DrawTranslatedNode(ch, output, offset, baseline);
offset += ch.Width + ch.RightSpace;
}
}
public static double Adjustment(MathNode script)
{
if (script.AlignToAxis)
return script.Axis();
else
return 0;
}
void CalculateRowHeights(MathNode node)
{
//Set initial row heights for cells with rowspan == 1
double commonAxis = node.Axis();
foreach(RowDescriptor r in node.Rows)
{
r.Height = 0;
r.Depth = 0;
foreach (CellDescriptor c in r.Cells)
{
if (c == null || c.Content == null || c.RowSpan != 1)
continue;
double cellAxis = c.Content.Axis();
c.VShift = 0;
if (c.VAlign == "baseline")
{
if (r.AlignToAxis == true)
c.VShift -= commonAxis;
if (c.Content.AlignToAxis == true)
c.VShift += cellAxis;
}
else if (c.VAlign == "axis")
{
if (!r.AlignToAxis)
c.VShift += commonAxis;
if (!c.Content.AlignToAxis)
c.VShift -= cellAxis;
}
else
{
c.VShift = (r.Height - r.Depth - c.Content.Height + c.Content.Depth) / 2;
}
r.Height = Math.Max(r.Height, c.Content.Height + c.VShift);
r.Depth = Math.Max(r.Depth, c.Content.Depth - c.VShift);
}
}
// Calculate heights for cells with rowspan > 1
while (true)
{
List<RowDescriptor> adjustedRows = new List<RowDescriptor>();
double adjustedSize = 0;
foreach (var item in node.Rows.Select((value,i) => new {i, value}))
{
RowDescriptor r = item.value;
foreach (CellDescriptor c in r.Cells)
{
if (c == null || c.Content == null || c.RowSpan == 1)
continue;
List<RowDescriptor> rows = node.Rows.Skip(item.i).Take(item.i + c.RowSpan).ToList();
double requiredSize = c.Content.Height + c.Content.Depth;
requiredSize -= rows.Where((value, i) => i < rows.Count).Select(x=> x.SpaceAfter).Sum();
double fullSize = rows.Select(x=> x.Height+x.Depth).Sum();
if (fullSize >= requiredSize)
continue;
double unitSize = requiredSize / rows.Count;
while (true)
{
List<RowDescriptor> oversizedRows = rows.Where(x => x.Height + x.Depth > unitSize).ToList(); //ToDo: Verify
if (oversizedRows.Count == 0)
break;
rows = rows.Where(x => x.Height + x.Depth < unitSize).ToList();
if (rows.Count == 0)
break; // weird rounding effects
requiredSize -= oversizedRows.Select(x => x.Height + x.Depth).Sum();
unitSize = requiredSize / rows.Count;
}
if (rows.Count == 0)
continue; // protection against arithmetic overflow
if (unitSize > adjustedSize)
{
adjustedSize = unitSize;
adjustedRows = rows;
}
}
}
if (adjustedRows.Count == 0)
break;
foreach (RowDescriptor r in adjustedRows)
{
double delta = (adjustedSize - r.Height - r.Depth) / 2;
r.Height += delta;
r.Depth += delta;
}
}
if (node.GetProperty("equalrows") == "true")
{
double maxvsize = node.Rows.Select(x => x.Height + x.Depth).Max();
foreach (RowDescriptor r in node.Rows)
{
double delta = (maxvsize - r.Height - r.Depth) / 2;
r.Height += delta;
r.Depth += delta;
}
}
}
private void MeasureScripts(MathNode node, List<MathNode> subscripts, List<MathNode> superscripts, List<MathNode> presubscripts = null, List<MathNode> presuperscripts = null)
{
node.SubScripts = subscripts == null ? new List<MathNode>() : subscripts;
node.SuperScripts = superscripts == null ? new List<MathNode>() : superscripts;
node.PreSubScripts = presubscripts == null ? new List<MathNode>() : presubscripts;
node.PreSuperScripts = presuperscripts == null ? new List<MathNode>() : presuperscripts;
SetNodeBase(node, node.Children[0]);
node.Width = node.Base.Width;
node.Height = node.Base.Height;
node.Depth = node.Base.Depth;
node.Ascender = node.Base.Ascender;
node.Descender = node.Base.Descender;
List<MathNode> both_subs = new List<MathNode>(node.SubScripts);
both_subs.AddRange(node.PreSubScripts);
List<MathNode> both_sups = new List<MathNode>(node.SuperScripts);
both_sups.AddRange(node.PreSuperScripts);
node.SubScriptAxis = both_subs.Select(x => x.Axis()).Union(new List<double>() { 0 }).Max();
node.SuperScriptAxis = both_sups.Select(x => x.Axis()).Union(new List<double>() { 0 }).Max();
List<MathNode> all = new List<MathNode>(both_subs);
all.AddRange(both_sups);
double gap = all.Select(x => x.NominalLineGap()).Max(); //ToDo:Validate
double protrusion = node.ParseLength("0.25ex");
double scriptMedian = node.Axis();
double[] v = GetRowVerticalExtent(both_subs, false, node.SubScriptAxis);
double subHeight = v[0];
double subDepth = v[1];
double subAscender = v[2];
double subDescender = v[3];
v = GetRowVerticalExtent(both_sups, false, node.SuperScriptAxis);
double superHeight = v[0];
double superDepth = v[1];
double superAscender = v[2];
double superDescender = v[3];
node.SubShift = 0;
if (both_subs.Count > 0)
{
string shiftAttr = node.GetProperty("subscriptshift");
if (shiftAttr == null)
shiftAttr = "0.5ex";
node.SubShift = node.ParseLength(shiftAttr); // positive shifts down
node.SubShift = Math.Max(node.SubShift, subHeight - scriptMedian + gap);
if (node.AlignToAxis)
node.SubShift += node.Axis();
node.SubShift = Math.Max(node.SubShift, node.Base.Depth + protrusion - subDepth);
node.Height = Math.Max(node.Height, subHeight - node.SubShift);
node.Depth = Math.Max(node.Depth, subDepth + node.SubShift);
node.Ascender = Math.Max(node.Ascender, subAscender - node.SubShift);
node.Descender = Math.Max(node.Descender, subDescender + node.SubShift);
}
node.SuperShift = 0;
if (both_sups.Count > 0)
{
string shiftAttr = node.GetProperty("superscriptshift");
if (shiftAttr == null)
shiftAttr = "1ex";
node.SuperShift = node.ParseLength(shiftAttr); // positive shifts up
node.SuperShift = Math.Max(node.SuperShift, superDepth + scriptMedian + gap);
if (node.AlignToAxis)
node.SuperShift -= node.Axis();
node.SuperShift = Math.Max(node.SuperShift, node.Base.Height + protrusion - superHeight);
node.Height = Math.Max(node.Height, superHeight + node.SuperShift);
node.Depth = Math.Max(node.Depth, superDepth - node.SuperShift);
node.Ascender = Math.Max(node.Ascender, superHeight + node.SuperShift);
node.Descender = Math.Max(node.Descender, superDepth - node.SuperShift);
}
node.PostWidths = ParallelWidths(node.SubScripts, node.SuperScripts);
node.PreWidths = ParallelWidths(node.PreSubScripts, node.PreSuperScripts);
node.Width += node.PreWidths.Sum() + node.PostWidths.Sum();
}
