/// <summary>
/// Update legend VM.
/// </summary>
/// <param name="ic2sc">Context.</param>
public override void UpdateLegend(ICategory2StyleContext ic2sc)
{
if (_legend == null)
{
return;
}
_legend.Fill = CreateBrush(ic2sc);
_legend.Minimum = ic2sc.ValueExtents.Minimum;
_legend.Maximum = ic2sc.ValueExtents.Maximum;
}
Legend EnsureLegend(ICategory2StyleContext ic2sc, string title, Style pathstyle)
{
var brush = CreateBrush(ic2sc);
if (_legend != null)
{
_legend.Fill = brush;
return(_legend);
}
_legend = new LegendValueRange()
{
Title = title, Minimum = ic2sc.ValueExtents.Minimum, Maximum = ic2sc.ValueExtents.Maximum, Fill = brush, Stroke = pathstyle.Find <Brush>(Path.StrokeProperty)
};
return(_legend);
}
/// <summary>
/// Establish the legend for this style generator.
/// </summary>
/// <param name="ic2sc">Context.</param>
/// <param name="title">Series title.</param>
/// <param name="pathstyle">Use for other style properties as required.</param>
/// <returns>Cached list enumerator.</returns>
public override IEnumerable <LegendBase> LegendFor(ICategory2StyleContext ic2sc, string title, Style pathstyle)
{
if (_legend == null)
{
_legend = new List <LegendBase>();
foreach (var ex in Entries)
{
var leg = new LegendValueRange()
{
Title = ex.Title, Minimum = ex.Minimum, Maximum = ex.Maximum, Fill = ex.Color, Stroke = BasedOn.Find <Brush>(Path.StrokeProperty)
};
_legend.Add(leg);
}
}
return(_legend);
}
/// <summary>
/// Produce a style for the given context.
/// </summary>
/// <param name="ic2sc">Context.</param>
/// <returns>Style or NULL.</returns>
public override Style For(ICategory2StyleContext ic2sc)
{
if (BasedOn == null)
{
return(null);
}
var match = Entries.SingleOrDefault(xx => xx.Compare(ic2sc.Values[0]));
if (match == null)
{
return(null);
}
var style = BasedOn.Override(Path.FillProperty, match.Color);
return(style);
}
Brush CreateBrush(ICategory2StyleContext ic2sc)
{
var gsc = new GradientStopCollection();
InfoFor(ic2sc.ValueExtents.Minimum, ic2sc.ValueExtents.Maximum, ic2sc.ValueExtents.Minimum, out int red, out int green, out int blue);
gsc.Add(new GradientStop()
{
Color = Color.FromArgb(Alpha, (byte)red, (byte)green, (byte)blue), Offset = 1
});
InfoFor(ic2sc.ValueExtents.Minimum, ic2sc.ValueExtents.Maximum, ic2sc.ValueExtents.Maximum, out red, out green, out blue);
gsc.Add(new GradientStop()
{
Color = Color.FromArgb(Alpha, (byte)red, (byte)green, (byte)blue), Offset = 0
});
return(new LinearGradientBrush(gsc, 90));
}
/// <summary>
/// Create a style or NULL.
/// </summary>
/// <param name="ic2sc">Item context.</param>
/// <returns>Style or NULL.</returns>
public override Style For(ICategory2StyleContext ic2sc)
{
if (BasedOn == null)
{
return(null);
}
InfoFor(ic2sc.ValueExtents.Minimum, ic2sc.ValueExtents.Maximum, ic2sc.Values[0], out int red, out int green, out int blue);
string skey = $"r{red}_g{green}_b{blue}";
if (StyleMap.TryGetValue(skey, out Style stx))
{
return(stx);
}
var brush = BrushFor(red, green, blue);
var style = BasedOn.Override(Path.FillProperty, brush);
StyleMap.Add(skey, style);
return(style);
}
/// <summary>
/// Nothing to update; NOT dependent on value range.
/// </summary>
/// <param name="ic2sc"></param>
public override void UpdateLegend(ICategory2StyleContext ic2sc)
{
}
/// <summary>
/// Generate the legend VM (with initial values).
/// </summary>
/// <param name="ic2sc">Context.</param>
/// <param name="title">Series title.</param>
/// <param name="pathstyle">Use for other style elements.</param>
/// <returns>New instance, but with STABLE entries.</returns>
public override IEnumerable <LegendBase> LegendFor(ICategory2StyleContext ic2sc, string title, Style pathstyle)
{
return(new LegendBase[] { EnsureLegend(ic2sc, title, pathstyle) });
}
/// <summary> /// Update legend VM. /// </summary> /// <param name="ic2sc">Context.</param> public abstract void UpdateLegend(ICategory2StyleContext ic2sc);
/// <summary> /// Generate the legend VM (with initial values). /// </summary> /// <param name="ic2sc">Context.</param> /// <param name="title">Series title.</param> /// <param name="pathstyle">Use for other style elements.</param> /// <returns>New instance, but with STABLE entries.</returns> public abstract IEnumerable <LegendBase> LegendFor(ICategory2StyleContext ic2sc, string title, Style pathstyle);
/// <summary> /// Provide a style or NULL to revert. /// </summary> /// <param name="ic2sc">Value context.</param> /// <returns>Style or NULL.</returns> public abstract Style For(ICategory2StyleContext ic2sc);