/// <summary>
/// Prepare the item state, but no <see cref="Geometry"/>.
/// </summary>
/// <param name="index"></param>
/// <param name="valuex"></param>
/// <param name="valuey"></param>
/// <param name="item"></param>
/// <param name="evs"></param>
/// <returns></returns>
ItemState <Path> ElementPipeline(int index, double valuex, double valuey, object item, Evaluators evs)
{
var mappedy = ValueAxis.For(valuey);
var mappedx = CategoryAxis.For(valuex);
var linex = mappedx + CategoryAxisOffset;
_trace.Verbose($"{Name}[{index}] v:({valuex},{valuey}) m:({linex},{mappedy})");
var cs = evs.LabelFor(item);
if (cs == null)
{
return(new ItemState <Path>(index, mappedx, CategoryAxisOffset, mappedy, Segments));
}
else
{
return(new ItemStateCustom <Path>(index, mappedx, CategoryAxisOffset, mappedy, cs, Segments));
}
}
/// <summary>
/// Create the next series state.
/// </summary>
/// <param name="index"></param>
/// <param name="valuex"></param>
/// <param name="item"></param>
/// <param name="recycler"></param>
/// <param name="evs"></param>
/// <returns>New instance or NULL.</returns>
SeriesItemState ElementPipeline(int index, double valuex, object item, Recycler <Path, SeriesItemState> recycler, Evaluators evs)
{
var leftx = CategoryAxis.For(valuex);
var barx = BarOffset;
var rightx = barx + BarWidth;
var sis = evs.byl == null ? new SeriesItemState(index, leftx, BarOffset) : new SeriesItemState_Custom(index, leftx, BarOffset, evs.byl.For(item));
for (int ix = 0; ix < evs.bys.Length; ix++)
{
var valuey = CoerceValue(item, evs.bys[ix]);
if (double.IsNaN(valuey))
{
continue;
}
var colbase = valuey >= 0 ? sis.Max : sis.Min;
var colend = colbase + valuey;
var y1 = ValueAxis.For(colend);
var y2 = ValueAxis.For(colbase);
var topy = Math.Max(y1, y2);
var bottomy = Math.Min(y1, y2);
sis.UpdateLimits(y1);
_trace.Verbose($"{Name}[{index},{ix}] {valuey} ({barx},{topy}) ({rightx},{bottomy}) sis ({sis.Min},{sis.Max})");
var path = recycler.Next(null);
if (path == null)
{
return(null);
}
var shim = new GeometryWithOffsetShim <RectangleGeometry>()
{
PathData = new RectangleGeometry()
{
Rect = new Rect(new Point(barx, topy), new Point(rightx, bottomy))
}
};
path.Item2.DataContext = shim;
BindTo(ColumnStack[ix], "PathStyle", path.Item2, FrameworkElement.StyleProperty);
// bind offset
BindTo(shim, nameof(shim.Offset), path.Item2, Canvas.LeftProperty);
UpdateLimits(valuex, sis.Min, sis.Max);
sis.Elements.Add(new Tuple <double, Path>(valuey, path.Item2));
}
return(sis);
}
/// <summary>
/// Core element processing.
/// The <see cref="RectangleGeometry"/> inside the <see cref="Path"/> is now location-invariant wrt x-axis.
/// This means that during incremental updates, no re-calculation is required, only adjusting the <see cref="Canvas.LeftProperty"/>.
/// </summary>
/// <param name="index"></param>
/// <param name="valuex"></param>
/// <param name="valuey"></param>
/// <param name="item"></param>
/// <param name="recycler"></param>
/// <param name="byl"></param>
/// <returns></returns>
ItemState <Path> ElementPipeline(int index, double valuex, double valuey, object item, Recycler <Path, ItemState <Path> > recycler, BindingEvaluator byl)
{
var y1 = ValueAxis.For(valuey);
var y2 = ValueAxis.For(0);
var topy = Math.Max(y1, y2);
var bottomy = Math.Min(y1, y2);
var leftx = CategoryAxis.For(valuex);
var barx = BarOffset;
var rightx = barx + BarWidth;
_trace.Verbose($"{Name}[{index}] {valuey} ({barx},{topy}) ({rightx},{bottomy})");
var path = recycler.Next(null);
if (path == null)
{
return(null);
}
var shim = new GeometryWithOffsetShim <RectangleGeometry>()
{
PathData = new RectangleGeometry()
{
Rect = new Rect(new Point(barx, topy), new Point(rightx, bottomy))
}
};
path.Item2.DataContext = shim;
// connect the shim to template root element's Visibility
BindTo(shim, nameof(shim.Visibility), path.Item2, UIElement.VisibilityProperty);
BindTo(shim, nameof(shim.Offset), path.Item2, Canvas.LeftProperty);
if (byl == null)
{
return(new SeriesItemState_Double(index, leftx, BarOffset, y1, path.Item2));
}
else
{
var cs = byl.For(item);
return(new SeriesItemState_Custom(index, leftx, BarOffset, y1, cs, path.Item2));
}
}
ItemState <Path> ElementPipeline(
int index, double valuex, double valueO, double valueH, double valueL, double valueC,
object item, Recycler <Path, ItemState <Path> > recycler, BindingEvaluator bvl
)
{
// map through axes
var y1 = ValueAxis.For(valueO);
var y2 = ValueAxis.For(valueC);
var y3 = ValueAxis.For(valueH);
var y4 = ValueAxis.For(valueL);
var leftx = CategoryAxis.For(valuex);
var offsetx = BarOffset;
var rightx = offsetx + BarWidth;
// force them to be a min/max
var topy = Math.Max(y1, y2);
var bottomy = Math.Min(y1, y2);
var highy = Math.Max(y3, y4);
var lowy = Math.Min(y3, y4);
_trace.Verbose($"{Name}[{index}] {valueO}/{valueH}/{valueL}/{valueC} ({offsetx},{topy}) ({rightx},{bottomy})");
// create geometry
var path = recycler.Next(null);
if (path == null)
{
return(null);
}
var pg = new PathGeometry();
// body (open/close)
var body = PathHelper.Rectangle(offsetx, topy, rightx, bottomy);
pg.Figures.Add(body);
// upper shadow (high)
var centerx = offsetx + (rightx - offsetx) / 2;
var upper = PathHelper.Line(centerx, topy, centerx, highy);
pg.Figures.Add(upper);
// lower shadow (low)
var lower = PathHelper.Line(centerx, bottomy, centerx, lowy);
pg.Figures.Add(lower);
var shim = new GeometryWithOffsetShim <PathGeometry>()
{
PathData = pg
};
path.Item2.DataContext = shim;
// establish the style for "forward" or "reverse" polarity
BindTo(this, valueO < valueC ? nameof(PathStyle) : nameof(ReversePathStyle), path.Item2, Path.StyleProperty);
// bind offset
BindTo(shim, nameof(shim.Offset), path.Item2, Canvas.LeftProperty);
var figs = new Tuple <double, PathFigure> [4];
figs[0] = new Tuple <double, PathFigure>(y1, body);
figs[1] = new Tuple <double, PathFigure>(y2, body);
figs[2] = new Tuple <double, PathFigure>(y3, upper);
figs[3] = new Tuple <double, PathFigure>(y4, lower);
if (bvl == null)
{
return(new SeriesItemState(index, leftx, BarOffset, y1, path.Item2, figs));
}
else
{
var cs = bvl.For(item);
return(new SeriesItemState_Custom(index, leftx, BarOffset, y1, cs, path.Item2, figs));
}
}