/// <summary>
/// Draws a text primitive to the specified destination buffer.
/// </summary>
/// <param name="buffer">The destination buffer.</param>
/// <param name="brush">A GDI brush to use for drawing.</param>
/// <param name="fontFactory">A GDI font factory to use for drawing.</param>
/// <param name="text">The text primitive to be drawn.</param>
/// <param name="dpi">The intended output DPI.</param>
public static void DrawTextPrimitive(IGdiBuffer buffer, SolidBrush brush, FontFactory fontFactory, InvariantTextPrimitive text, float dpi = _nominalScreenDpi)
{
text.CoordinateSystem = CoordinateSystem.Destination;
try
{
// We adjust the font size depending on the scale so that it's the same size
// irrespective of the zoom
var fontSize = CalculateScaledFontPoints(text.SizeInPoints, dpi);
var font = fontFactory.GetFont(text.Font, fontSize, FontStyle.Regular, GraphicsUnit.Point, FontFactory.GenericSansSerif);
// Calculate how big the text will be so we can set the bounding box
text.Dimensions = buffer.Graphics.MeasureString(text.Text, font);
// Draw drop shadow
brush.Color = Color.Black;
var dropShadowOffset = new SizeF(1, 1);
var boundingBoxTopLeft = new PointF(text.BoundingBox.Left, text.BoundingBox.Top);
buffer.Graphics.DrawString(
text.Text,
font,
brush,
boundingBoxTopLeft + dropShadowOffset);
// Draw text
brush.Color = text.Color;
buffer.Graphics.DrawString(
text.Text,
font,
brush,
boundingBoxTopLeft);
}
finally
{
text.ResetCoordinateSystem();
}
}
/// <summary>
/// Draws an annotation box to the specified destination buffer.
/// </summary>
/// <param name="buffer">The destination buffer.</param>
/// <param name="brush">A GDI brush to use for drawing.</param>
/// <param name="fontFactory">A GDI font factory to use for drawing.</param>
/// <param name="annotationText">The annotation text to be drawn.</param>
/// <param name="annotationBox">The annotation box to be drawn.</param>
/// <param name="dpi">The intended output DPI.</param>
public static void DrawAnnotationBox(IGdiBuffer buffer, SolidBrush brush, FontFactory fontFactory, string annotationText, AnnotationBox annotationBox, float dpi = _nominalScreenDpi)
{
// if there's nothing to draw, there's nothing to do. go figure.
if (string.IsNullOrEmpty(annotationText))
return;
var clientRectangle = RectangleUtilities.CalculateSubRectangle(buffer.Bounds, annotationBox.NormalizedRectangle);
//Deflate the client rectangle by 4 pixels to allow some space
//between neighbouring rectangles whose borders coincide.
Rectangle.Inflate(clientRectangle, -4, -4);
var fontSize = (clientRectangle.Height/annotationBox.NumberOfLines) - 1;
//don't draw it if it's too small to read, anyway.
if (fontSize < MinimumFontSizeInPixels)
return;
using (var format = new StringFormat())
{
if (annotationBox.Truncation == AnnotationBox.TruncationBehaviour.Truncate)
format.Trimming = StringTrimming.Character;
else
format.Trimming = StringTrimming.EllipsisCharacter;
if (annotationBox.FitWidth)
format.Trimming = StringTrimming.None;
if (annotationBox.Justification == AnnotationBox.JustificationBehaviour.Right)
format.Alignment = StringAlignment.Far;
else if (annotationBox.Justification == AnnotationBox.JustificationBehaviour.Center)
format.Alignment = StringAlignment.Center;
else
format.Alignment = StringAlignment.Near;
if (annotationBox.VerticalAlignment == AnnotationBox.VerticalAlignmentBehaviour.Top)
format.LineAlignment = StringAlignment.Near;
else if (annotationBox.VerticalAlignment == AnnotationBox.VerticalAlignmentBehaviour.Center)
format.LineAlignment = StringAlignment.Center;
else
format.LineAlignment = StringAlignment.Far;
//allow p's and q's, etc to extend slightly beyond the bounding rectangle. Only completely visible lines are shown.
format.FormatFlags = StringFormatFlags.NoClip;
if (annotationBox.NumberOfLines == 1)
format.FormatFlags |= StringFormatFlags.NoWrap;
var style = FontStyle.Regular;
if (annotationBox.Bold)
style |= FontStyle.Bold;
if (annotationBox.Italics)
style |= FontStyle.Italic;
//don't draw it if it's too small to read, anyway.
if (fontSize < MinimumFontSizeInPixels)
return;
var font = fontFactory.GetFont(annotationBox.Font, fontSize, style, GraphicsUnit.Pixel, AnnotationBox.DefaultFont);
var layoutArea = new SizeF(clientRectangle.Width, clientRectangle.Height);
var size = buffer.Graphics.MeasureString(annotationText, font, layoutArea, format);
if (annotationBox.FitWidth && size.Width > clientRectangle.Width)
{
fontSize = (int) (Math.Round(fontSize*clientRectangle.Width/(double) size.Width - 0.5));
//don't draw it if it's too small to read, anyway.
if (fontSize < MinimumFontSizeInPixels)
return;
font = fontFactory.GetFont(annotationBox.Font, fontSize, style, GraphicsUnit.Pixel, AnnotationBox.DefaultFont);
}
// Draw drop shadow
brush.Color = Color.Black;
clientRectangle.Offset(1, 1);
buffer.Graphics.DrawString(
annotationText,
font,
brush,
clientRectangle,
format);
brush.Color = Color.FromName(annotationBox.Color);
clientRectangle.Offset(-1, -1);
buffer.Graphics.DrawString(
annotationText,
font,
brush,
clientRectangle,
format);
}
}
