/// <summary>
/// Get the absolute location of dp
/// </summary>
/// <param name="cg">for finding the absolute location</param>
/// <param name="dp"></param>
/// <returns></returns>
public static PointF GetAbsolutePoint(ChartGraphics cg, DataPoint dp)
{
PointF p1 = new PointF(
(float)cg.GetPositionFromAxis("Default", AxisName.X, dp.XValue),
(float)cg.GetPositionFromAxis("Default", AxisName.Y, dp.YValues[0]));
p1 = cg.GetAbsolutePoint(p1);
return p1;
}
/// <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>
/// </summary>
/// <param name="cg"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
private PointF ToPixelsPos(ChartGraphics cg, double x, double y)
{
var p = new PointF((float) cg.GetPositionFromAxis(kChartAreaName, AxisName.X, x),
(float) cg.GetPositionFromAxis(kChartAreaName, AxisName.Y, y));
return cg.GetAbsolutePoint(p);
}
/// <summary>
/// Paints an annotation object on the specified graphics.
/// </summary>
/// <param name="graphics">
/// A <see cref="ChartGraphics"/> object, used to paint an annotation object.
/// </param>
/// <param name="chart">
/// Reference to the <see cref="Chart"/> owner control.
/// </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));
// Adjust coordinates
AdjustLineCoordinates(ref firstPoint, ref secondPoint, ref selectionRect);
// Check if text position is valid
if (float.IsNaN(firstPoint.X) ||
float.IsNaN(firstPoint.Y) ||
float.IsNaN(secondPoint.X) ||
float.IsNaN(secondPoint.Y))
{
return;
}
// Set line caps
bool capChanged = false;
LineCap oldStartCap = LineCap.Flat;
LineCap oldEndCap = LineCap.Flat;
if (this._startCap != LineAnchorCapStyle.None ||
this._endCap != LineAnchorCapStyle.None)
{
capChanged = true;
oldStartCap = graphics.Pen.StartCap;
oldEndCap = graphics.Pen.EndCap;
// Apply anchor cap settings
if (this._startCap == LineAnchorCapStyle.Arrow)
{
// Adjust arrow size for small line width
if (this.LineWidth < 4)
{
int adjustment = 3 - this.LineWidth;
graphics.Pen.StartCap = LineCap.Custom;
graphics.Pen.CustomStartCap = new AdjustableArrowCap(
this.LineWidth + adjustment,
this.LineWidth + adjustment,
true);
}
else
{
graphics.Pen.StartCap = LineCap.ArrowAnchor;
}
}
else if (this._startCap == LineAnchorCapStyle.Diamond)
{
graphics.Pen.StartCap = LineCap.DiamondAnchor;
}
else if (this._startCap == LineAnchorCapStyle.Round)
{
graphics.Pen.StartCap = LineCap.RoundAnchor;
}
else if (this._startCap == LineAnchorCapStyle.Square)
{
graphics.Pen.StartCap = LineCap.SquareAnchor;
}
if (this._endCap == LineAnchorCapStyle.Arrow)
{
// Adjust arrow size for small line width
if (this.LineWidth < 4)
{
int adjustment = 3 - this.LineWidth;
graphics.Pen.EndCap = LineCap.Custom;
graphics.Pen.CustomEndCap = new AdjustableArrowCap(
this.LineWidth + adjustment,
this.LineWidth + adjustment,
true);
}
else
{
graphics.Pen.EndCap = LineCap.ArrowAnchor;
}
}
else if (this._endCap == LineAnchorCapStyle.Diamond)
{
graphics.Pen.EndCap = LineCap.DiamondAnchor;
}
else if (this._endCap == LineAnchorCapStyle.Round)
{
graphics.Pen.EndCap = LineCap.RoundAnchor;
}
else if (this._endCap == LineAnchorCapStyle.Square)
{
graphics.Pen.EndCap = LineCap.SquareAnchor;
}
}
if (this.Common.ProcessModePaint)
{
// Draw line
graphics.DrawLineRel(
this.LineColor,
this.LineWidth,
this.LineDashStyle,
firstPoint,
secondPoint,
this.ShadowColor,
this.ShadowOffset);
}
if (this.Common.ProcessModeRegions)
{
// Create line graphics path
using (GraphicsPath path = new GraphicsPath())
{
path.AddLine(
graphics.GetAbsolutePoint(firstPoint),
graphics.GetAbsolutePoint(secondPoint));
using (Pen pen = (Pen)graphics.Pen.Clone())
{
// Increase pen size by 2 pixels
pen.DashStyle = DashStyle.Solid;
pen.Width += 2;
try
{
path.Widen(pen);
}
catch (OutOfMemoryException)
{
// GraphicsPath.Widen incorrectly throws OutOfMemoryException
// catching here and reacting by not widening
}
catch (ArgumentException)
{
}
}
// Add hot region
this.Common.HotRegionsList.AddHotRegion(
graphics,
path,
false,
ReplaceKeywords(this.ToolTip),
String.Empty,
String.Empty,
String.Empty,
this,
ChartElementType.Annotation);
}
}
// Restore line caps
if (capChanged)
{
graphics.Pen.StartCap = oldStartCap;
graphics.Pen.EndCap = oldEndCap;
}
// Paint selection handles
PaintSelectionHandles(graphics, selectionRect, null);
}