private static void RenderLabel(CommonElements common, ChartGraphics graph, CategoryNode node, DataPoint dataPoint, DataPointAttributes dataPointAttributes, string text, float startAngle, float sweepAngle, PointF centerAbsolute, float radiusAbsolute, int dataPointIndex, GraphicsPath sliceGraphicsPath)
{
if (string.IsNullOrEmpty(text))
{
return;
}
SizeF size = graph.MeasureString(text.Replace("\\n", "\n"), dataPointAttributes.Font, new SizeF(1000f, 1000f), new StringFormat(StringFormat.GenericTypographic));
SizeF relativeSize = graph.GetRelativeSize(size);
float num = relativeSize.Width / (float)text.Length;
float num2 = relativeSize.Width + num;
float num3 = relativeSize.Height + relativeSize.Height / 8f;
float sliceCenterAngle = GetSliceCenterAngle(startAngle, sweepAngle);
float labelAngle = GetLabelAngle(sliceCenterAngle);
PointF sliceCenterRelative = GetSliceCenterRelative(graph, sliceCenterAngle, centerAbsolute, radiusAbsolute);
RectangleF resizedRect = new RectangleF(sliceCenterRelative.X - num2 / 2f, sliceCenterRelative.Y - num3 / 2f, num2, num3);
if (resizedRect.IsEmpty)
{
return;
}
int num4 = (int)labelAngle + dataPointAttributes.FontAngle;
if (graph.CanLabelFitInSlice(sliceGraphicsPath, resizedRect, num4) || CanFitInResizedArea(text, dataPointAttributes.Font, relativeSize, sliceCenterRelative, graph, sliceGraphicsPath, resizedRect, num4, radiusAbsolute, out resizedRect))
{
if (dataPoint != null)
{
graph.DrawPointLabelStringRel(common, text, dataPoint.Font, new SolidBrush(dataPoint.FontColor), resizedRect, format, (int)labelAngle + dataPoint.FontAngle, resizedRect, dataPoint.LabelBackColor, dataPoint.LabelBorderColor, dataPoint.LabelBorderWidth, dataPoint.LabelBorderStyle, dataPoint.series, dataPoint, dataPointIndex);
return;
}
graph.DrawLabelBackground(num4, sliceCenterRelative, resizedRect, dataPointAttributes.LabelBackColor, dataPointAttributes.LabelBorderColor, dataPointAttributes.LabelBorderWidth, dataPointAttributes.LabelBorderStyle);
graph.MapCategoryNodeLabel(common, node, resizedRect);
graph.DrawStringRel(text, dataPointAttributes.Font, new SolidBrush(dataPointAttributes.FontColor), resizedRect, format, num4);
}
}
private static bool CanFitInResizedArea(string text, Font textFont, SizeF relativeSize, PointF sliceCenterRelative, ChartGraphics graph, GraphicsPath sliceGraphicsPath, RectangleF labelRelativeRect, int labelRotationAngle, float radiusAbsolute, out RectangleF resizedRect)
{
float num = relativeSize.Width / (float)text.Length;
float num2 = relativeSize.Height / 8f;
float num3 = relativeSize.Width + num;
float width = labelRelativeRect.Width;
float height = relativeSize.Height;
resizedRect = labelRelativeRect;
for (int i = 2; i <= 4; i++)
{
float num4 = num3 / (float)i + num;
float num5 = height * (float)i + num2;
labelRelativeRect = new RectangleF(sliceCenterRelative.X - num4 / 2f, sliceCenterRelative.Y - num5 / 2f, num4, num5);
if (graph.CanLabelFitInSlice(sliceGraphicsPath, labelRelativeRect, labelRotationAngle))
{
labelRelativeRect.Width = FindOptimalWidth(width, graph, sliceGraphicsPath, labelRelativeRect, labelRotationAngle);
StringFormat stringFormat = new StringFormat(StringFormat.GenericTypographic);
stringFormat.FormatFlags = format.FormatFlags;
graph.MeasureString(text.Replace("\\n", "\n"), textFont, labelRelativeRect.Size, stringFormat, out int charactersFitted, out int _);
if (charactersFitted == text.Length)
{
resizedRect = labelRelativeRect;
return(true);
}
}
}
return(false);
}
private static bool CanFitInResizedArea(string text, Font textFont, SizeF relativeSize, PointF sliceCenterRelative, ChartGraphics graph, GraphicsPath sliceGraphicsPath, RectangleF labelRelativeRect, int labelRotationAngle, float radiusAbsolute, out RectangleF resizedRect)
{
float num = relativeSize.Width / (float)text.Length;
float num2 = (float)(relativeSize.Height / 8.0);
float num3 = relativeSize.Width + num;
float width = labelRelativeRect.Width;
float height = relativeSize.Height;
resizedRect = labelRelativeRect;
for (int i = 2; i <= 4; i++)
{
float num4 = num3 / (float)i + num;
float num5 = height * (float)i + num2;
labelRelativeRect = new RectangleF((float)(sliceCenterRelative.X - num4 / 2.0), (float)(sliceCenterRelative.Y - num5 / 2.0), num4, num5);
if (graph.CanLabelFitInSlice(sliceGraphicsPath, labelRelativeRect, labelRotationAngle))
{
labelRelativeRect.Width = SunburstChart.FindOptimalWidth(width, graph, sliceGraphicsPath, labelRelativeRect, labelRotationAngle);
StringFormat stringFormat = new StringFormat(StringFormat.GenericTypographic);
stringFormat.FormatFlags = SunburstChart.format.FormatFlags;
int num6 = default(int);
int num7 = default(int);
((ChartRenderingEngine)graph).MeasureString(text.Replace("\\n", "\n"), textFont, labelRelativeRect.Size, stringFormat, out num6, out num7);
if (num6 == text.Length)
{
resizedRect = labelRelativeRect;
return(true);
}
}
}
return(false);
}
private static float FindOptimalWidth(float maxWidth, ChartGraphics graph, GraphicsPath sliceGraphicsPath, RectangleF labelRelativeRect, int labelRotationAngle)
{
RectangleF labelRelativeRect2 = new RectangleF(labelRelativeRect.Location, labelRelativeRect.Size);
float width = labelRelativeRect.Width;
int num = 4;
while (graph.CanLabelFitInSlice(sliceGraphicsPath, labelRelativeRect2, labelRotationAngle) && num-- >= 0)
{
width = labelRelativeRect2.Width;
labelRelativeRect2.Width = width + (maxWidth - width) / 2f;
}
return(width);
}