/// <summary>
/// Draw strip/line title text
/// </summary>
/// <param name="graph">Chart graphics object.</param>
/// <param name="rect">Rectangle to draw in.</param>
private void PaintTitle(ChartGraphics graph, RectangleF rect)
{
if (this.Text.Length > 0)
{
// Get title text
string titleText = this.Text;
// Prepare string format
using (StringFormat format = new StringFormat())
{
format.Alignment = this.TextAlignment;
if (graph.IsRightToLeft)
{
if (format.Alignment == StringAlignment.Far)
{
format.Alignment = StringAlignment.Near;
}
else if (format.Alignment == StringAlignment.Near)
{
format.Alignment = StringAlignment.Far;
}
}
format.LineAlignment = this.TextLineAlignment;
// Adjust default title angle for horizontal lines
int angle = 0;
switch (this.TextOrientation)
{
case (TextOrientation.Rotated90):
angle = 90;
break;
case (TextOrientation.Rotated270):
angle = 270;
break;
case (TextOrientation.Auto):
if (this.Axis.AxisPosition == AxisPosition.Bottom || this.Axis.AxisPosition == AxisPosition.Top)
{
angle = 270;
}
break;
}
// Set vertical text for horizontal lines
if (angle == 90)
{
format.FormatFlags = StringFormatFlags.DirectionVertical;
angle = 0;
}
else if (angle == 270)
{
format.FormatFlags = StringFormatFlags.DirectionVertical;
angle = 180;
}
// Measure string size
SizeF size = graph.MeasureStringRel(titleText.Replace("\\n", "\n"), this.Font, new SizeF(100, 100), format, this.GetTextOrientation());
// Adjust text size
float zPositon = 0f;
if (this.Axis.ChartArea.Area3DStyle.Enable3D)
{
// Get projection coordinates
Point3D[] textSizeProjection = new Point3D[3];
zPositon = this.Axis.ChartArea.IsMainSceneWallOnFront() ? this.Axis.ChartArea.areaSceneDepth : 0f;
textSizeProjection[0] = new Point3D(0f, 0f, zPositon);
textSizeProjection[1] = new Point3D(size.Width, 0f, zPositon);
textSizeProjection[2] = new Point3D(0f, size.Height, zPositon);
// Transform coordinates of text size
this.Axis.ChartArea.matrix3D.TransformPoints(textSizeProjection);
// Adjust text size
int index = this.Axis.ChartArea.IsMainSceneWallOnFront() ? 0 : 1;
size.Width *= size.Width / (textSizeProjection[index].X - textSizeProjection[(index == 0) ? 1 : 0].X);
size.Height *= size.Height / (textSizeProjection[2].Y - textSizeProjection[0].Y);
}
// Get relative size of the border width
SizeF sizeBorder = graph.GetRelativeSize(new SizeF(this.BorderWidth, this.BorderWidth));
// Find the center of rotation
PointF rotationCenter = PointF.Empty;
if (format.Alignment == StringAlignment.Near)
{ // Near
rotationCenter.X = rect.X + size.Width / 2 + sizeBorder.Width;
}
else if (format.Alignment == StringAlignment.Far)
{ // Far
rotationCenter.X = rect.Right - size.Width / 2 - sizeBorder.Width;
}
else
{ // Center
rotationCenter.X = (rect.Left + rect.Right) / 2;
}
if (format.LineAlignment == StringAlignment.Near)
{ // Near
rotationCenter.Y = rect.Top + size.Height / 2 + sizeBorder.Height;
}
else if (format.LineAlignment == StringAlignment.Far)
{ // Far
rotationCenter.Y = rect.Bottom - size.Height / 2 - sizeBorder.Height;
}
else
{ // Center
rotationCenter.Y = (rect.Bottom + rect.Top) / 2;
}
// Reset string alignment to center point
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
if (this.Axis.ChartArea.Area3DStyle.Enable3D)
{
// Get projection coordinates
Point3D[] rotationCenterProjection = new Point3D[2];
rotationCenterProjection[0] = new Point3D(rotationCenter.X, rotationCenter.Y, zPositon);
if (format.FormatFlags == StringFormatFlags.DirectionVertical)
{
rotationCenterProjection[1] = new Point3D(rotationCenter.X, rotationCenter.Y - 20f, zPositon);
}
else
{
rotationCenterProjection[1] = new Point3D(rotationCenter.X - 20f, rotationCenter.Y, zPositon);
}
// Transform coordinates of text rotation point
this.Axis.ChartArea.matrix3D.TransformPoints(rotationCenterProjection);
// Adjust rotation point
rotationCenter = rotationCenterProjection[0].PointF;
// Adjust angle of the text
if (angle == 0 || angle == 180 || angle == 90 || angle == 270)
{
if (format.FormatFlags == StringFormatFlags.DirectionVertical)
{
angle += 90;
}
// Convert coordinates to absolute
rotationCenterProjection[0].PointF = graph.GetAbsolutePoint(rotationCenterProjection[0].PointF);
rotationCenterProjection[1].PointF = graph.GetAbsolutePoint(rotationCenterProjection[1].PointF);
// Calcuate axis angle
float angleXAxis = (float)Math.Atan(
(rotationCenterProjection[1].Y - rotationCenterProjection[0].Y) /
(rotationCenterProjection[1].X - rotationCenterProjection[0].X));
angleXAxis = (float)Math.Round(angleXAxis * 180f / (float)Math.PI);
angle += (int)angleXAxis;
}
}
// Draw string
using (Brush brush = new SolidBrush(this.ForeColor))
{
graph.DrawStringRel(
titleText.Replace("\\n", "\n"),
this.Font,
brush,
rotationCenter,
format,
angle,
this.GetTextOrientation());
}
}
}
}
/// <summary>
/// Draws text in specified rectangle.
/// </summary>
/// <param name="graphics">Chart graphics.</param>
/// <param name="textPosition">Text position.</param>
/// <param name="noSpacingForCenteredText">True if text allowed to be outside of position when centered.</param>
/// <param name="getTextPosition">True if position text must be returned by the method.</param>
/// <returns>Text actual position if required.</returns>
internal RectangleF DrawText(ChartGraphics graphics, RectangleF textPosition, bool noSpacingForCenteredText, bool getTextPosition)
{
RectangleF textActualPosition = RectangleF.Empty;
//***************************************************************
//** Adjust text position uing text spacing
//***************************************************************
bool annotationRelative = false;
RectangleF textSpacing = GetTextSpacing(out annotationRelative);
float spacingScaleX = 1f;
float spacingScaleY = 1f;
if (annotationRelative)
{
if (textPosition.Width > 25f)
{
spacingScaleX = textPosition.Width / 50f;
spacingScaleX = Math.Max(1f, spacingScaleX);
}
if (textPosition.Height > 25f)
{
spacingScaleY = textPosition.Height / 50f;
spacingScaleY = Math.Max(1f, spacingScaleY);
}
}
RectangleF textPositionWithSpacing = new RectangleF(textPosition.Location, textPosition.Size);
textPositionWithSpacing.Width -= (textSpacing.Width + textSpacing.X) * spacingScaleX;
textPositionWithSpacing.X += textSpacing.X * spacingScaleX;
textPositionWithSpacing.Height -= (textSpacing.Height + textSpacing.Y) * spacingScaleY;
textPositionWithSpacing.Y += textSpacing.Y * spacingScaleY;
//***************************************************************
//** Replace new line characters
//***************************************************************
string titleText = this.ReplaceKeywords(this.Text.Replace("\\n", "\n"));
//***************************************************************
//** Check if centered text require spacing.
//** Use only half of the spacing required.
//** Apply only for 1 line of text.
//***************************************************************
if (noSpacingForCenteredText &&
titleText.IndexOf('\n') == -1)
{
if (this.Alignment == ContentAlignment.MiddleCenter ||
this.Alignment == ContentAlignment.MiddleLeft ||
this.Alignment == ContentAlignment.MiddleRight)
{
textPositionWithSpacing.Y = textPosition.Y;
textPositionWithSpacing.Height = textPosition.Height;
textPositionWithSpacing.Height -= textSpacing.Height / 2f + textSpacing.Y / 2f;
textPositionWithSpacing.Y += textSpacing.Y / 2f;
}
if (this.Alignment == ContentAlignment.BottomCenter ||
this.Alignment == ContentAlignment.MiddleCenter ||
this.Alignment == ContentAlignment.TopCenter)
{
textPositionWithSpacing.X = textPosition.X;
textPositionWithSpacing.Width = textPosition.Width;
textPositionWithSpacing.Width -= textSpacing.Width / 2f + textSpacing.X / 2f;
textPositionWithSpacing.X += textSpacing.X / 2f;
}
}
// Draw text
using (Brush textBrush = new SolidBrush(this.ForeColor))
{
using (StringFormat format = new StringFormat(StringFormat.GenericTypographic))
{
//***************************************************************
//** Set text format
//***************************************************************
format.FormatFlags = format.FormatFlags ^ StringFormatFlags.LineLimit;
format.Trimming = StringTrimming.EllipsisCharacter;
if (this.Alignment == ContentAlignment.BottomRight ||
this.Alignment == ContentAlignment.MiddleRight ||
this.Alignment == ContentAlignment.TopRight)
{
format.Alignment = StringAlignment.Far;
}
if (this.Alignment == ContentAlignment.BottomCenter ||
this.Alignment == ContentAlignment.MiddleCenter ||
this.Alignment == ContentAlignment.TopCenter)
{
format.Alignment = StringAlignment.Center;
}
if (this.Alignment == ContentAlignment.BottomCenter ||
this.Alignment == ContentAlignment.BottomLeft ||
this.Alignment == ContentAlignment.BottomRight)
{
format.LineAlignment = StringAlignment.Far;
}
if (this.Alignment == ContentAlignment.MiddleCenter ||
this.Alignment == ContentAlignment.MiddleLeft ||
this.Alignment == ContentAlignment.MiddleRight)
{
format.LineAlignment = StringAlignment.Center;
}
//***************************************************************
//** Set shadow color and offset
//***************************************************************
Color textShadowColor = ChartGraphics.GetGradientColor(this.ForeColor, Color.Black, 0.8);
int textShadowOffset = 1;
TextStyle textStyle = this.TextStyle;
if (textStyle == TextStyle.Shadow &&
ShadowOffset != 0)
{
// Draw shadowed text
textShadowColor = ShadowColor;
textShadowOffset = ShadowOffset;
}
if (textStyle == TextStyle.Shadow)
{
textShadowColor = (textShadowColor.A != 255) ? textShadowColor : Color.FromArgb(textShadowColor.A / 2, textShadowColor);
}
//***************************************************************
//** Get text actual position
//***************************************************************
if (getTextPosition)
{
// Measure text size
SizeF textSize = graphics.MeasureStringRel(
this.ReplaceKeywords(_text.Replace("\\n", "\n")),
this.Font,
textPositionWithSpacing.Size,
format);
// Get text position
textActualPosition = new RectangleF(textPositionWithSpacing.Location, textSize);
if (this.Alignment == ContentAlignment.BottomRight ||
this.Alignment == ContentAlignment.MiddleRight ||
this.Alignment == ContentAlignment.TopRight)
{
textActualPosition.X += textPositionWithSpacing.Width - textSize.Width;
}
if (this.Alignment == ContentAlignment.BottomCenter ||
this.Alignment == ContentAlignment.MiddleCenter ||
this.Alignment == ContentAlignment.TopCenter)
{
textActualPosition.X += (textPositionWithSpacing.Width - textSize.Width) / 2f;
}
if (this.Alignment == ContentAlignment.BottomCenter ||
this.Alignment == ContentAlignment.BottomLeft ||
this.Alignment == ContentAlignment.BottomRight)
{
textActualPosition.Y += textPositionWithSpacing.Height - textSize.Height;
}
if (this.Alignment == ContentAlignment.MiddleCenter ||
this.Alignment == ContentAlignment.MiddleLeft ||
this.Alignment == ContentAlignment.MiddleRight)
{
textActualPosition.Y += (textPositionWithSpacing.Height - textSize.Height) / 2f;
}
// Do not allow text to go outside annotation position
textActualPosition.Intersect(textPositionWithSpacing);
}
RectangleF absPosition = graphics.GetAbsoluteRectangle(textPositionWithSpacing);
Title.DrawStringWithStyle(
graphics,
titleText,
this.TextStyle,
this.Font,
absPosition,
this.ForeColor,
textShadowColor,
textShadowOffset,
format,
TextOrientation.Auto
);
}
}
return(textActualPosition);
}