/// <summary>
///
/// </summary>
/// <param name="drawingContext"></param>
/// <param name="mainAtomMetrics"></param>
/// <param name="hMetrics"></param>
/// <param name="isoMetrics"></param>
/// <param name="defaultHOrientation"></param>
/// <returns></returns>
private LabelMetrics DrawCharges(DrawingContext drawingContext,
AtomTextMetrics mainAtomMetrics,
AtomTextMetrics hMetrics,
LabelMetrics isoMetrics,
CompassPoints defaultHOrientation)
{
var chargeString = AtomHelpers.GetChargeString(Charge);
var chargeText = DrawChargeOrRadical(drawingContext, mainAtomMetrics, hMetrics, isoMetrics, chargeString, Fill, defaultHOrientation);
chargeText.TextMetrics.FlattenedPath = chargeText.TextRun.GetOutline();
return(chargeText.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
}
private static void RotateUntilClear(AtomTextMetrics mainAtomMetrics, AtomTextMetrics hMetrics, LabelMetrics isoMetrics,
Vector labelOffset, GlyphText labelText, out Point labelCenter, CompassPoints defHOrientation)
{
Matrix rotator = new Matrix();
double angle = Globals.ClockDirections.II.ToDegrees();
rotator.Rotate(angle);
labelOffset = labelOffset * rotator;
Rect bb = new Rect();
Rect bb2 = new Rect();
if (hMetrics != null)
{
bb = hMetrics.TotalBoundingBox;
}
if (isoMetrics != null)
{
bb2 = isoMetrics.BoundingBox;
}
labelCenter = mainAtomMetrics.Geocenter + labelOffset;
labelText.MeasureAtCenter(labelCenter);
double increment;
if (defHOrientation == CompassPoints.East)
{
increment = -10;
}
else
{
increment = 10;
}
while (labelText.CollidesWith(mainAtomMetrics.TotalBoundingBox, bb,
bb2) & Math.Abs(angle - 30) > 0.001)
{
rotator = new Matrix();
angle += increment;
rotator.Rotate(increment);
labelOffset = labelOffset * rotator;
labelCenter = mainAtomMetrics.Geocenter + labelOffset;
labelText.MeasureAtCenter(labelCenter);
}
}
/// <param name="drawingContext"></param>
/// <param name="mainAtomMetrics">
/// </param>
/// <param name="hMetrics">
/// </param>
/// <param name="isoMetrics">
/// </param>
/// <param name="chargeString"></param>
/// <param name="fill"></param>
/// <param name="defaultHOrientation"></param>
/// <returns></returns>
/// <summary>
/// Draws a charge or radical label at the given point
/// </summary>
/// <returns></returns>
private ChargeLabelText DrawChargeOrRadical(DrawingContext drawingContext, AtomTextMetrics mainAtomMetrics, AtomTextMetrics hMetrics, LabelMetrics isoMetrics, string chargeString, Brush fill, CompassPoints defaultHOrientation)
{
ChargeLabelText chargeText = new ChargeLabelText(chargeString, PixelsPerDip());
//try to place the charge at 2 o clock to the atom
Vector chargeOffset = BasicGeometry.ScreenNorth * GlyphText.SymbolSize * 0.9;
RotateUntilClear(mainAtomMetrics, hMetrics, isoMetrics, chargeOffset, chargeText, out var chargeCenter, defaultHOrientation);
chargeText.MeasureAtCenter(chargeCenter);
chargeText.Fill = fill;
chargeText.DrawAtBottomLeft(chargeText.TextMetrics.BoundingBox.BottomLeft, drawingContext);
return(chargeText);
}
