/// <summary>
/// Gets text annotation content size based on the text and font.
/// </summary>
/// <returns>Annotation content position.</returns>
override internal RectangleF GetContentPosition()
{
// Return pre calculated value
if (!contentSize.IsEmpty)
{
return(new RectangleF(float.NaN, float.NaN, contentSize.Width, contentSize.Height));
}
// Create temporary bitmap based chart graphics if chart was not
// rendered yet and the graphics was not created.
// NOTE: Fix for issue #3978.
Graphics graphics = null;
System.Drawing.Image graphicsImage = null;
ChartGraphics tempChartGraph = null;
if (GetGraphics() == null && this.Common != null)
{
graphicsImage = new System.Drawing.Bitmap(Common.ChartPicture.Width, Common.ChartPicture.Height);
graphics = Graphics.FromImage(graphicsImage);
tempChartGraph = new ChartGraphics(Common);
tempChartGraph.Graphics = graphics;
tempChartGraph.SetPictureSize(Common.ChartPicture.Width, Common.ChartPicture.Height);
this.Common.graph = tempChartGraph;
}
// Calculate content size
RectangleF result = RectangleF.Empty;
if (GetGraphics() != null && this.Text.Trim().Length > 0)
{
// Measure text using current font and slightly increase it
contentSize = GetGraphics().MeasureString(
"W" + this.ReplaceKeywords(this.Text.Replace("\\n", "\n")),
this.Font,
new SizeF(2000, 2000),
StringFormat.GenericTypographic);
contentSize.Height *= 1.04f;
// Convert to relative coordinates
contentSize = GetGraphics().GetRelativeSize(contentSize);
// Add spacing
bool annotationRelative = false;
RectangleF textSpacing = GetTextSpacing(out annotationRelative);
float spacingScaleX = 1f;
float spacingScaleY = 1f;
if (annotationRelative)
{
if (contentSize.Width > 25f)
{
spacingScaleX = contentSize.Width / 25f;
spacingScaleX = Math.Max(1f, spacingScaleX);
}
if (contentSize.Height > 25f)
{
spacingScaleY = contentSize.Height / 25f;
spacingScaleY = Math.Max(1f, spacingScaleY);
}
}
contentSize.Width += (textSpacing.X + textSpacing.Width) * spacingScaleX;
contentSize.Height += (textSpacing.Y + textSpacing.Height) * spacingScaleY;
result = new RectangleF(float.NaN, float.NaN, contentSize.Width, contentSize.Height);
}
// Dispose temporary chart graphics
if (tempChartGraph != null)
{
tempChartGraph.Dispose();
graphics.Dispose();
graphicsImage.Dispose();
this.Common.graph = null;
}
return(result);
}