//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);
}
/// <summary>
/// Draws the subscripted group text
/// </summary>
/// <param name="drawingContext">DC supplied by OnRender</param>
/// <param name="measure">Provided by calling the Measure method previously</param>
/// <param name="pixelsPerDip"></param>
/// <param name="fill"></param>
public void DrawSelf(DrawingContext drawingContext, AtomTextMetrics measure, float pixelsPerDip, Brush fill)
{
_mainText.Fill = fill;
_mainText.DrawAtBottomLeft(measure.BoundingBox.BottomLeft, drawingContext);
if (_subText != null)
{
_subText.Fill = fill;
_subText.DrawAtBottomLeft(_subText.TextMetrics.BoundingBox.BottomLeft, drawingContext);
}
}
/// <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);
}
public void MeasureAtBottomLeft(Point bottomLeft, float PixelsPerDip)
{
GlyphInfo = GlyphUtils.GetGlyphsAndInfo(Text, PixelsPerDip, out GlyphRun groupGlyphRun, bottomLeft, _glyphTypeface, TypeSize);
TextRun = groupGlyphRun;
TextMetrics = new AtomTextMetrics
{
BoundingBox = groupGlyphRun.GetBoundingBox(bottomLeft),
Geocenter = bottomLeft,
TotalBoundingBox = groupGlyphRun.GetBoundingBox(bottomLeft),
FlattenedPath = GlyphUtils.GetOutline(TextRun),
OffsetVector = new Vector(0.0d, 0.0d)
};
}
/// <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);
}
/// <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);
}
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);
}
}
public void MeasureAtCenter(Point center)
{
GlyphInfo = GlyphUtils.GetGlyphsAndInfo(Text, PixelsPerDip, out GlyphRun groupGlyphRun, center, _glyphTypeface, TypeSize);
//compensate the main offset vector for any descenders
Vector mainOffset = GlyphUtils.GetOffsetVector(groupGlyphRun, TypeSize) +
new Vector(0.0, -MaxBaselineOffset);
var bb = groupGlyphRun.GetBoundingBox(center + mainOffset);
Vector textFormatterOffset = new Vector(mainOffset.X, -FirstBearing(groupGlyphRun) - bb.Height / 2);
TextRun = groupGlyphRun;
TextMetrics = new AtomTextMetrics
{
BoundingBox = bb,
Geocenter = center,
TotalBoundingBox = groupGlyphRun.GetBoundingBox(center + mainOffset),
OffsetVector = mainOffset,
TextFormatterOffset = textFormatterOffset
};
}
/// <summary>
/// Gets the center point of an atom adjunct (like an implicit hydrogen plus subscripts)
/// The Adjunct in NH2 is H2
/// </summary>
/// <param name="parentMetrics">Metrics of the parent atom</param>
/// <param name="direction">NESW direction of the adjunct respective to the atom</param>
/// <param name="adjunctGlyphInfo">Initial measurements of the adjunct</param>
/// <param name="subscriptInfo">Initial measurements of the subscript (can be null for no subscripts)</param>
/// <returns></returns>
private static Point GetAdjunctCenter(AtomTextMetrics parentMetrics, CompassPoints direction,
GlyphInfo adjunctGlyphInfo, GlyphInfo?subscriptInfo = null)
{
Point adjunctCenter;
double charHeight = (GlyphUtils.GlyphTypeface.Baseline * _fontSize);
double adjunctWidth = (parentMetrics.BoundingBox.Width + adjunctGlyphInfo.Width) / 2;
switch (direction)
{
//all addition in this routine is *vector* addition.
//We are not adding absolute X and Y values
case CompassPoints.East:
default:
adjunctCenter = parentMetrics.Geocenter + BasicGeometry.ScreenEast * adjunctWidth;
break;
case CompassPoints.North:
adjunctCenter = parentMetrics.Geocenter +
BasicGeometry.ScreenNorth * charHeight;
break;
case CompassPoints.West:
if (subscriptInfo != null)
{
adjunctCenter = parentMetrics.Geocenter + (BasicGeometry.ScreenWest *
(adjunctWidth + subscriptInfo.Value.Width));
}
else
{
adjunctCenter = parentMetrics.Geocenter + (BasicGeometry.ScreenWest * (adjunctWidth));
}
break;
case CompassPoints.South:
adjunctCenter = parentMetrics.Geocenter +
BasicGeometry.ScreenSouth * charHeight;
break;
}
return(adjunctCenter);
}
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
}