//draws the isotope label at ten-o-clock
private LabelMetrics DrawIsotopeLabel(DrawingContext drawingContext, AtomTextMetrics mainAtomMetrics, AtomTextMetrics hMetrics)
{
Debug.Assert(Isotope != null);
string isoLabel = Isotope.ToString();
var isotopeText = new IsotopeLabelText(isoLabel, PixelsPerDip());
Vector isotopeOffsetVector = BasicGeometry.ScreenNorth * GlyphText.SymbolSize;
Matrix rotator = new Matrix();
double angle = -60;
//avoid overlap of label and hydrogens
if (hMetrics != null && ParentAtom.GetDefaultHOrientation() == CompassPoints.West)
{
angle = -35;
}
rotator.Rotate(angle);
isotopeOffsetVector = isotopeOffsetVector * rotator;
Point isoCenter = mainAtomMetrics.Geocenter + isotopeOffsetVector;
isotopeText.MeasureAtCenter(isoCenter);
isotopeText.Fill = Fill;
isotopeText.DrawAtBottomLeft(isotopeText.TextMetrics.BoundingBox.BottomLeft, drawingContext);
return(isotopeText.TextMetrics);
}
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
}
