private void DrawBackground(Graphics _canvas, double _fFadingFactor)
{
// The roundness of the rectangle is computed from the font size.
int radius = (int)(m_fRescaledFontSize / 2);
int diameter = radius * 2;
GraphicsPath gp = new GraphicsPath();
gp.StartFigure();
int iOffsetX = 0;
int iOffsetY = 0;
if (m_bBackgroundIsRelative)
{
// If we are on relative coords (i.e: drawing the main label that follows the target)
// then the background "top left" is actually relative to the current position.
// (i.e: can be negative.)
// Hence we need add to it the current track position.
iOffsetX = m_RescaledLocation.X;
iOffsetY = m_RescaledLocation.Y;
}
gp.AddArc(RescaledBackground.X + iOffsetX, RescaledBackground.Y + iOffsetY, diameter, diameter, 180, 90);
gp.AddLine(RescaledBackground.X + iOffsetX + radius, RescaledBackground.Y + iOffsetY, RescaledBackground.X + iOffsetX + RescaledBackground.Width - diameter, RescaledBackground.Y + iOffsetY);
gp.AddArc(RescaledBackground.X + iOffsetX + RescaledBackground.Width - diameter, RescaledBackground.Y + iOffsetY, diameter, diameter, 270, 90);
gp.AddLine(RescaledBackground.X + iOffsetX + RescaledBackground.Width, RescaledBackground.Y + iOffsetY + radius, RescaledBackground.X + iOffsetX + RescaledBackground.Width, RescaledBackground.Y + iOffsetY + RescaledBackground.Height - diameter);
gp.AddArc(RescaledBackground.X + iOffsetX + RescaledBackground.Width - diameter, RescaledBackground.Y + iOffsetY + RescaledBackground.Height - diameter, diameter, diameter, 0, 90);
gp.AddLine(RescaledBackground.X + iOffsetX + RescaledBackground.Width - radius, RescaledBackground.Y + iOffsetY + RescaledBackground.Height, RescaledBackground.X + iOffsetX + radius, RescaledBackground.Y + iOffsetY + RescaledBackground.Height);
gp.AddArc(RescaledBackground.X + iOffsetX, RescaledBackground.Y + iOffsetY + RescaledBackground.Height - diameter, diameter, diameter, 90, 90);
gp.AddLine(RescaledBackground.X + iOffsetX, RescaledBackground.Y + iOffsetY + RescaledBackground.Height - radius, RescaledBackground.X + iOffsetX, RescaledBackground.Y + iOffsetY + radius);
gp.CloseFigure();
Color fadingColor = m_TextDecoration.GetFadingBackColor(_fFadingFactor);
Color moreFadingColor = m_TextDecoration.GetFadingBackColor(_fFadingFactor / 4);
// Small dot
_canvas.FillEllipse(new SolidBrush(fadingColor), m_RescaledLocation.X - 2, m_RescaledLocation.Y - 2, 4, 4);
// Connector
_canvas.DrawLine(new Pen(moreFadingColor), m_RescaledLocation.X, m_RescaledLocation.Y, RescaledBackground.X + iOffsetX + RescaledBackground.Width / 2, RescaledBackground.Y + iOffsetY + RescaledBackground.Height / 2);
// Rounded rectangle
_canvas.FillPath(new SolidBrush(fadingColor), gp);
}
public override void Draw(Graphics _canvas, double _fStretchFactor, bool _bSelected, long _iCurrentTimestamp, Point _DirectZoomTopLeft)
{
double fOpacityFactor = m_InfosFading.GetOpacityFactor(_iCurrentTimestamp);
if (fOpacityFactor > 0)
{
// Rescale the points.
m_fStretchFactor = _fStretchFactor;
m_DirectZoomTopLeft = new Point(_DirectZoomTopLeft.X, _DirectZoomTopLeft.Y);
RescaleCoordinates(m_fStretchFactor, m_DirectZoomTopLeft);
//----------------------------------------------------------
// Draw disk section
// Unfortunately we need to compute everything at each draw
// (draw may be triggered on image resize)
//----------------------------------------------------------
ComputeFillRegion();
SolidBrush FillBrush = new SolidBrush(Color.FromArgb((int)((double)m_iDefaultBackgroundAlpha * fOpacityFactor), m_BackgroundFillColor));
Pen PenEdges = new Pen(m_InfosStyle.GetFadingBackColor(fOpacityFactor));
_canvas.FillPie(FillBrush, (float)m_BoundingPoint.X, (float)m_BoundingPoint.Y, (float)m_fRadius * 2, (float)m_fRadius * 2, m_fStartAngle, m_fSweepAngle);
_canvas.DrawPie(PenEdges, (float)m_BoundingPoint.X, (float)m_BoundingPoint.Y, (float)m_fRadius * 2, (float)m_fRadius * 2, m_fStartAngle, m_fSweepAngle);
//-----------------------------
// Draw the edges
//-----------------------------
_canvas.DrawLine(PenEdges, RescaledPointO.X, RescaledPointO.Y, RescaledPointA.X, RescaledPointA.Y);
_canvas.DrawLine(PenEdges, RescaledPointO.X, RescaledPointO.Y, RescaledPointB.X, RescaledPointB.Y);
//-----------------------------
// Draw handlers
//-----------------------------
if (_bSelected)
{
PenEdges.Width = 2;
}
_canvas.DrawEllipse(PenEdges, GetRescaledHandleRectangle(1));
_canvas.DrawEllipse(PenEdges, GetRescaledHandleRectangle(2));
_canvas.DrawEllipse(PenEdges, GetRescaledHandleRectangle(3));
//----------------------------
// Draw Measure
//----------------------------
// We try to be inside the pie, so we compute the bissectrice and do some trigo.
// We start the text on the bissectrice, at a distance of iTextRadius.
Point TextOrigin = GetTextPosition();
SolidBrush fontBrush = new SolidBrush(m_InfosStyle.GetFadingForeColor(fOpacityFactor));
int angle = (int)Math.Floor(-m_fSweepAngle);
_canvas.DrawString("α=" + angle.ToString() + "°", m_InfosStyle.GetInternalFont(), fontBrush, TextOrigin);
}
}
