/// <summary>
/// Gets position of the axis break line. Break line may be shown as a single
/// line or two lines separated with a spacing.
/// </summary>
/// <param name="graph">Chart graphics.</param>
/// <param name="nextSegment">Next segment reference.</param>
/// <returns>Position of the axis break line in pixel coordinates.</returns>
internal RectangleF GetBreakLinePosition(ChartGraphics graph, AxisScaleSegment nextSegment)
{
// Start with the plotting rectangle position
RectangleF breakPosition = this.axis.PlotAreaPosition.ToRectangleF();
// Find maximum scale value of the current segment and minimuj of the next
double from = this.axis.GetLinearPosition(nextSegment.ScaleMinimum);
double to = this.axis.GetLinearPosition(this.ScaleMaximum);
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
breakPosition.Y = (float)Math.Min(from, to);
breakPosition.Height = (float)Math.Max(from, to);
}
else
{
breakPosition.X = (float)Math.Min(from, to);
breakPosition.Width = (float)Math.Max(from, to);;
}
// Convert to pixels
breakPosition = Rectangle.Round(graph.GetAbsoluteRectangle(breakPosition));
// Add border width
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
breakPosition.Height = (float)Math.Abs(breakPosition.Y - breakPosition.Height);
breakPosition.X -= this.axis.ChartArea.BorderWidth;
breakPosition.Width += 2 * this.axis.ChartArea.BorderWidth;
}
else
{
breakPosition.Width = (float)Math.Abs(breakPosition.X - breakPosition.Width);
breakPosition.Y -= this.axis.ChartArea.BorderWidth;
breakPosition.Height += 2 * this.axis.ChartArea.BorderWidth;
}
return(breakPosition);
}
/// <summary>
/// Paints the axis break line.
/// </summary>
/// <param name="graph">Chart graphics to use.</param>
/// <param name="nextSegment">Axis scale segment next to current.</param>
internal void PaintBreakLine(ChartGraphics graph, AxisScaleSegment nextSegment)
{
// Get break line position
RectangleF breakPosition = this.GetBreakLinePosition(graph, nextSegment);
// Get top line graphics path
GraphicsPath breakLinePathTop = this.GetBreakLinePath(breakPosition, true);
GraphicsPath breakLinePathBottom = null;
// Clear break line space using chart color behind the area
if (breakPosition.Width > 0f && breakPosition.Height > 0f)
{
// Get bottom line graphics path
breakLinePathBottom = this.GetBreakLinePath(breakPosition, false);
// Clear plotting area background
using (GraphicsPath fillPath = new GraphicsPath())
{
// Create fill path out of top and bottom break lines
fillPath.AddPath(breakLinePathTop, true);
fillPath.Reverse();
fillPath.AddPath(breakLinePathBottom, true);
fillPath.CloseAllFigures();
// Use chart back color to fill the area
using (Brush fillBrush = this.GetChartFillBrush(graph))
{
graph.FillPath(fillBrush, fillPath);
// Check if shadow exsits in chart area
if (this.axis.ChartArea.ShadowOffset != 0 && !this.axis.ChartArea.ShadowColor.IsEmpty)
{
// Clear shadow
RectangleF shadowPartRect = breakPosition;
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
shadowPartRect.Y += this.axis.ChartArea.ShadowOffset;
shadowPartRect.Height -= this.axis.ChartArea.ShadowOffset;
shadowPartRect.X = shadowPartRect.Right - 1;
shadowPartRect.Width = this.axis.ChartArea.ShadowOffset + 2;
}
else
{
shadowPartRect.X += this.axis.ChartArea.ShadowOffset;
shadowPartRect.Width -= this.axis.ChartArea.ShadowOffset;
shadowPartRect.Y = shadowPartRect.Bottom - 1;
shadowPartRect.Height = this.axis.ChartArea.ShadowOffset + 2;
}
graph.FillRectangle(fillBrush, shadowPartRect);
// Draw new shadow
using (GraphicsPath shadowPath = new GraphicsPath())
{
shadowPath.AddPath(breakLinePathTop, false);
// Define maximum size
float size = this.axis.ChartArea.ShadowOffset;
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
size = Math.Min(size, breakPosition.Height);
}
else
{
size = Math.Min(size, breakPosition.Width);
}
// Define step to increase transperancy
int transparencyStep = (int)(this.axis.ChartArea.ShadowColor.A / size);
// Set clip region to achieve spacing of the shadow
// Start with the plotting rectangle position
RectangleF clipRegion = graph.GetAbsoluteRectangle(this.axis.PlotAreaPosition.ToRectangleF());
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
clipRegion.X += this.axis.ChartArea.ShadowOffset;
clipRegion.Width += this.axis.ChartArea.ShadowOffset;
}
else
{
clipRegion.Y += this.axis.ChartArea.ShadowOffset;
clipRegion.Height += this.axis.ChartArea.ShadowOffset;
}
graph.SetClip(graph.GetRelativeRectangle(clipRegion));
// Draw several lines to form shadow
for (int index = 0; index < size; index++)
{
using (Matrix newMatrix = new Matrix())
{
// Shift top break line by 1 pixel
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
newMatrix.Translate(0f, 1f);
}
else
{
newMatrix.Translate(1f, 0f);
}
shadowPath.Transform(newMatrix);
}
// Get line color
Color color = Color.FromArgb(
this.axis.ChartArea.ShadowColor.A - transparencyStep * index,
this.axis.ChartArea.ShadowColor);
using (Pen shadowPen = new Pen(color, 1))
{
// Draw shadow
graph.DrawPath(shadowPen, shadowPath);
}
}
graph.ResetClip();
}
}
}
}
}
// Draw Separator Line(s)
if (this.axis.ScaleBreakStyle.BreakLineStyle != BreakLineStyle.None)
{
using (Pen pen = new Pen(this.axis.ScaleBreakStyle.LineColor, this.axis.ScaleBreakStyle.LineWidth))
{
// Set line style
pen.DashStyle = graph.GetPenStyle(this.axis.ScaleBreakStyle.LineDashStyle);
// Draw break lines
graph.DrawPath(pen, breakLinePathTop);
if (breakPosition.Width > 0f && breakPosition.Height > 0f)
{
graph.DrawPath(pen, breakLinePathBottom);
}
}
}
// Dispose break line paths
breakLinePathTop.Dispose();
breakLinePathTop = null;
if (breakLinePathBottom != null)
{
breakLinePathBottom.Dispose();
breakLinePathBottom = null;
}
}
/// <summary>
/// Helper method which calculates chart area plotting position in pixels.
/// </summary>
/// <param name="area">Chart area to get the plotting area position.</param>
/// <param name="chartGraphics">Chart graphics object.</param>
/// <returns>Chart area ploting area position in pixels.</returns>
private RectangleF GetChartAreaPlottingPosition(ChartArea area, ChartGraphics chartGraphics)
{
RectangleF plottingRect = area.Position.ToRectangleF();
plottingRect.X += (area.Position.Width / 100F) * area.InnerPlotPosition.X;
plottingRect.Y += (area.Position.Height / 100F) * area.InnerPlotPosition.Y;
plottingRect.Width = (area.Position.Width / 100F) * area.InnerPlotPosition.Width;
plottingRect.Height = (area.Position.Height / 100F) * area.InnerPlotPosition.Height;
plottingRect = chartGraphics.GetAbsoluteRectangle(plottingRect);
return plottingRect;
}
/// <summary>
/// Get arrow path for the specified annotation position
/// </summary>
/// <param name="graphics"></param>
/// <param name="position"></param>
/// <returns></returns>
private GraphicsPath GetArrowPath(
ChartGraphics graphics,
RectangleF position)
{
// Get absolute position
RectangleF positionAbs = graphics.GetAbsoluteRectangle(position);
PointF firstPoint = positionAbs.Location;
PointF secondPoint = new PointF(positionAbs.Right, positionAbs.Bottom);
// Calculate arrow length
float deltaX = secondPoint.X - firstPoint.X;
float deltaY = secondPoint.Y - firstPoint.Y;
float arrowLength = (float)Math.Sqrt(deltaX * deltaX + deltaY * deltaY);
// Create unrotated graphics path for the arrow started at the annotation location
// and going to the right for the length of the rotated arrow.
GraphicsPath path = new GraphicsPath();
PointF[] points = null;
float pointerRatio = 2.1f;
if (this.ArrowStyle == ArrowStyle.Simple)
{
points = new PointF[] {
firstPoint,
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y - this.ArrowSize * pointerRatio),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y - this.ArrowSize),
new PointF(firstPoint.X + arrowLength, firstPoint.Y - this.ArrowSize),
new PointF(firstPoint.X + arrowLength, firstPoint.Y + this.ArrowSize),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y + this.ArrowSize),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y + this.ArrowSize * pointerRatio)
};
}
else if (this.ArrowStyle == ArrowStyle.DoubleArrow)
{
points = new PointF[] {
firstPoint,
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y - this.ArrowSize * pointerRatio),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y - this.ArrowSize),
new PointF(firstPoint.X + arrowLength - this.ArrowSize * pointerRatio, firstPoint.Y - this.ArrowSize),
new PointF(firstPoint.X + arrowLength - this.ArrowSize * pointerRatio, firstPoint.Y - this.ArrowSize * pointerRatio),
new PointF(firstPoint.X + arrowLength, firstPoint.Y),
new PointF(firstPoint.X + arrowLength - this.ArrowSize * pointerRatio, firstPoint.Y + this.ArrowSize * pointerRatio),
new PointF(firstPoint.X + arrowLength - this.ArrowSize * pointerRatio, firstPoint.Y + this.ArrowSize),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y + this.ArrowSize),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y + this.ArrowSize * pointerRatio)
};
}
else if (this.ArrowStyle == ArrowStyle.Tailed)
{
float tailRatio = 2.1f;
points = new PointF[] {
firstPoint,
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y - this.ArrowSize * pointerRatio),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y - this.ArrowSize),
new PointF(firstPoint.X + arrowLength, firstPoint.Y - this.ArrowSize * tailRatio),
new PointF(firstPoint.X + arrowLength - this.ArrowSize * tailRatio, firstPoint.Y),
new PointF(firstPoint.X + arrowLength, firstPoint.Y + this.ArrowSize * tailRatio),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y + this.ArrowSize),
new PointF(firstPoint.X + this.ArrowSize * pointerRatio, firstPoint.Y + this.ArrowSize * pointerRatio)
};
}
else
{
throw (new InvalidOperationException(SR.ExceptionAnnotationArrowStyleUnknown));
}
path.AddLines(points);
path.CloseAllFigures();
// Calculate arrow angle
float angle = (float)(Math.Atan(deltaY / deltaX) * 180f / Math.PI);
if (deltaX < 0)
{
angle += 180f;
}
// Rotate arrow path around the first point
using (Matrix matrix = new Matrix())
{
matrix.RotateAt(angle, firstPoint);
path.Transform(matrix);
}
return(path);
}
/// <summary>
/// Paints the annotation object on the specified graphics.
/// </summary>
/// <param name="graphics">
/// A <see cref="ChartGraphics"/>
/// </param>
/// <param name="chart">
/// Reference to the <see cref="Chart"/> control that owns the annotation.
/// </param>
override internal void Paint(Chart chart, ChartGraphics graphics)
{
// Get annotation position in relative coordinates
PointF firstPoint = PointF.Empty;
PointF anchorPoint = PointF.Empty;
SizeF size = SizeF.Empty;
GetRelativePosition(out firstPoint, out size, out anchorPoint);
PointF secondPoint = new PointF(firstPoint.X + size.Width, firstPoint.Y + size.Height);
// Create selection rectangle
RectangleF selectionRect = new RectangleF(firstPoint, new SizeF(secondPoint.X - firstPoint.X, secondPoint.Y - firstPoint.Y));
// Get text position
RectangleF rectanglePosition = new RectangleF(selectionRect.Location, selectionRect.Size);
if (rectanglePosition.Width < 0)
{
rectanglePosition.X = rectanglePosition.Right;
rectanglePosition.Width = -rectanglePosition.Width;
}
if (rectanglePosition.Height < 0)
{
rectanglePosition.Y = rectanglePosition.Bottom;
rectanglePosition.Height = -rectanglePosition.Height;
}
// Check if position is valid
if (float.IsNaN(rectanglePosition.X) ||
float.IsNaN(rectanglePosition.Y) ||
float.IsNaN(rectanglePosition.Right) ||
float.IsNaN(rectanglePosition.Bottom))
{
return;
}
if (this.Common.ProcessModePaint)
{
// Do not draw border if size is less that 10 pixels
RectangleF absRectanglePosition = graphics.GetAbsoluteRectangle(rectanglePosition);
if (absRectanglePosition.Width > 30f &&
absRectanglePosition.Height > 30f)
{
// Draw rectangle
graphics.Draw3DBorderRel(
_borderSkin,
rectanglePosition,
this.BackColor,
this.BackHatchStyle,
String.Empty,
ChartImageWrapMode.Scaled,
Color.Empty,
ChartImageAlignmentStyle.Center,
this.BackGradientStyle,
this.BackSecondaryColor,
this.LineColor,
this.LineWidth,
this.LineDashStyle);
}
}
// Call base class to paint text, selection handles and process hot regions
base.Paint(chart, graphics);
}
/// <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);
}
