/// <summary>
/// Measures the dimensions of the atom prior to rendering
/// </summary>
/// <param name="parentMetrics">Metrics of the parent atom</param>
/// <param name="direction">Orientation of the group relative to the parent atom, i.e. NESW</param>
/// <returns>AtomTextMetrics object describing placement</returns>
public AtomTextMetrics Measure(AtomTextMetrics parentMetrics, CompassPoints direction, float pixelsPerDip)
{
_subText = null;
List <Point> mainOutline;
//first, get some initial size measurements
_mainText = new GlyphText(Text, SymbolTypeface, _fontSize, pixelsPerDip);
_mainText.Premeasure();
//measure up the subscript (if we have one)
string subscriptText = AtomHelpers.GetSubText(Count);
if (subscriptText != "")
{
_subText = new SubLabelText(subscriptText, pixelsPerDip);
_subText.Premeasure();
}
//calculate the center of the H Atom depending on the direction
var groupCenter = GetAdjunctCenter(parentMetrics, direction, _mainText.GlyphInfo, _subText?.GlyphInfo);
//remeasure the main text
_mainText.MeasureAtCenter(groupCenter);
mainOutline = _mainText.FlattenedPath;
if (_subText != null)
//get the offset for the subscript
{
Vector subscriptOffset = new Vector(_mainText.TextMetrics.TotalBoundingBox.Width + _mainText.TrailingBearing + _subText.LeadingBearing,
_subText.TextMetrics.BoundingBox.Height / 2);
Point subBottomLeft = _mainText.TextMetrics.TotalBoundingBox.BottomLeft + subscriptOffset;
_subText.MeasureAtBottomLeft(subBottomLeft, pixelsPerDip);
//merge the total bounding boxes
_mainText.Union(_subText);
mainOutline.AddRange(_subText.FlattenedPath);
}
//return the placement metrics for the subscripted atom.
AtomTextMetrics result = new AtomTextMetrics
{
Geocenter = groupCenter,
BoundingBox = _mainText.TextMetrics.BoundingBox,
TotalBoundingBox = _mainText.TextMetrics.TotalBoundingBox,
FlattenedPath = mainOutline
};
return(result);
}
//draws the main atom symbol, or an ellipse if necessary
private AtomTextMetrics DrawSelf(DrawingContext drawingContext, bool measureOnly = false)
{
if (AtomSymbol != "")
{
var symbolText = new GlyphText(AtomSymbol, SymbolTypeface, GlyphText.SymbolSize, PixelsPerDip());
symbolText.Fill = Fill;
symbolText.MeasureAtCenter(Position);
if (!measureOnly)
{
symbolText.DrawAtBottomLeft(symbolText.TextMetrics.BoundingBox.BottomLeft, drawingContext);
}
return(symbolText.TextMetrics);
}
else
{
//so draw a circle
double radiusX = GlyphText.SymbolSize / 3;
if (!measureOnly)
{
//drawingContext.DrawEllipse(Fill, null, Position, radiusX, radiusX);
}
Rect boundingBox = new Rect(new Point(Position.X - radiusX, Position.Y - radiusX),
new Point(Position.X + radiusX, Position.Y + radiusX));
return(new AtomTextMetrics
{
BoundingBox = boundingBox,
Geocenter = Position,
TotalBoundingBox = boundingBox,
FlattenedPath = new List <Point>
{
boundingBox.BottomLeft, boundingBox.TopLeft, boundingBox.TopRight, boundingBox.BottomRight
}
});
}
}
private void RenderAtom(DrawingContext drawingContext)
{
//renders the atom complete with charges, hydrogens and labels.
//this code is *complex* - alter it at your own risk!
List <Point> symbolPoints = new List <Point>();
List <Point> hydrogenPoints = new List <Point>();
//private variables used to keep track of onscreen visuals
AtomTextMetrics hydrogenMetrics = null;
LabelMetrics isoMetrics = null;
SubscriptedGroup subscriptedGroup = null;
Hull = new List <Point>();
//stage 1: measure up the main atom symbol in position
//we need the metrics first
if (AtomSymbol != "")
{
var symbolText = new GlyphText(AtomSymbol,
SymbolTypeface, GlyphText.SymbolSize, PixelsPerDip());
symbolText.MeasureAtCenter(Position);
//grab the hull for later
if (symbolText.FlattenedPath != null)
{
Hull.AddRange(symbolText.FlattenedPath);
}
}
//stage 2. grab the main atom metrics br drawing it
var mainAtomMetrics = DrawSelf(drawingContext);
//if it's a vertex atom we need the hull
if (AtomSymbol == "")
{
Hull.AddRange(mainAtomMetrics.FlattenedPath);
}
//stage 3: measure up the hydrogens
//if we have implicit hydrogens and we have an explicit label, draw them
if (ImplicitHydrogenCount > 0 && AtomSymbol != "")
{
var defaultHOrientation = ParentAtom.GetDefaultHOrientation();
subscriptedGroup = new SubscriptedGroup(ImplicitHydrogenCount, "H", GlyphText.SymbolSize);
hydrogenMetrics = subscriptedGroup.Measure(mainAtomMetrics, defaultHOrientation, PixelsPerDip());
subscriptedGroup.DrawSelf(drawingContext, hydrogenMetrics, PixelsPerDip(), Fill);
hydrogenPoints = hydrogenMetrics.FlattenedPath;
Hull.AddRange(hydrogenPoints);
}
//stage 6: draw an isotope label if needed
if (Isotope != null)
{
isoMetrics = DrawIsotopeLabel(drawingContext, mainAtomMetrics, hydrogenMetrics);
Hull.AddRange(isoMetrics.Corners);
}
//stage7: draw any charges
if ((Charge ?? 0) != 0)
{
LabelMetrics cMetrics = DrawCharges(drawingContext, mainAtomMetrics, hydrogenMetrics, isoMetrics, ParentAtom.GetDefaultHOrientation());
Hull.AddRange(cMetrics.FlattenedPath);
}
//stage 8: recalculate the hull
if (Hull.Any())
{
//sort the points properly before doing a hull calculation
var sortedHull = (from Point p in Hull
orderby p.X, p.Y descending
select p).ToList();
Hull = Geometry <Point> .GetHull(sortedHull, p => p);
// Diag: Show the Hull
#if DEBUG
#if SHOWHULLS
ShowHull(Hull, drawingContext);
#endif
#endif
// End Diag
}
// Diag: Show the Atom Point
#if DEBUG
#if SHOWATOMCENTRES
drawingContext.DrawEllipse(Brushes.Red, null, ParentAtom.Position, 5, 5);
#endif
#endif
// End Diag
}