/// <summary>
/// Gets the fill color of the given <see cref="HistogramItem"/>.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>The fill color of the item.</returns>
protected OxyColor GetItemFillColor(HistogramItem item)
{
if (!item.Color.IsAutomatic())
{
return(item.Color);
}
else
{
return(this.ColorMapping(item));
}
}
/// <summary>
/// Gets the default color for a HistogramItem.
/// </summary>
/// <returns>The default color.</returns>
private OxyColor GetDefaultColor(HistogramItem item)
{
return(this.ActualFillColor);
}
/// <summary>
/// Draws the label.
/// </summary>
/// <param name="rc">The render context.</param>
/// <param name="clippingRect">The clipping rectangle.</param>
/// <param name="rect">The column rectangle.</param>
/// <param name="item">The item.</param>
protected void RenderLabel(IRenderContext rc, OxyRect clippingRect, OxyRect rect, HistogramItem item)
{
var s = StringHelper.Format(this.ActualCulture, this.LabelFormatString, item, item.Value);
DataPoint dp;
VerticalAlignment va;
var ha = HorizontalAlignment.Center;
var midX = (item.RangeStart + item.RangeEnd) / 2;
var sign = Math.Sign(item.Value);
var dy = sign * this.LabelMargin;
switch (this.LabelPlacement)
{
case LabelPlacement.Inside:
dp = new DataPoint(midX, item.Value);
va = (VerticalAlignment)(-sign);
break;
case LabelPlacement.Middle:
var p1 = this.InverseTransform(rect.TopLeft);
var p2 = this.InverseTransform(rect.BottomRight);
dp = new DataPoint(midX, (p1.Y + p2.Y) / 2);
va = VerticalAlignment.Middle;
break;
case LabelPlacement.Base:
dp = new DataPoint(midX, 0);
dy = -dy;
va = (VerticalAlignment)sign;
break;
case LabelPlacement.Outside:
dp = new DataPoint(midX, item.Value);
dy = -dy;
va = (VerticalAlignment)sign;
break;
default:
throw new ArgumentOutOfRangeException();
}
this.Orientate(ref ha, ref va);
var sp = this.Transform(dp) + this.Orientate(new ScreenVector(0, dy));
rc.DrawClippedText(
clippingRect,
sp,
s,
this.ActualTextColor,
this.ActualFont,
this.ActualFontSize,
this.ActualFontWeight,
0,
ha,
va);
}
/// <summary>
/// Gets the fill color of the given <see cref="HistogramItem"/>.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>The fill color of the item.</returns>
protected OxyColor GetItemFillColor(HistogramItem item)
{
return(item.Color.IsAutomatic() ? this.ColorMapping(item) : item.Color);
}
/// <summary> /// The default color mapping. /// </summary> private OxyColor defaultColorMapping(HistogramItem item) => this.ActualFillColor;