//=============================================================================
public void Draw(ICoordinateSystem cs, DrawingContext dc)
{
if (!m_bCenter_IsSetted)
{
return;
}
if (cs != null && dc != null)
{
Pen _pen = new Pen(new SolidColorBrush(m_Color), m_Thickness);
//
// If fill with transparent color then circle fill area will act in HitTest.
// Fill with null brush will disable circle HitTest on click in fill area.
Brush fillBrush = null;
if (m_FillColor != Colors.Transparent)
{
fillBrush = new SolidColorBrush(m_FillColor);
}
double rScale = cs.Get_Scale();
dc.DrawEllipse(fillBrush, _pen, cs.GetLocalPoint(m_pntCenter), m_rRadius * rScale, m_rRadius * rScale);
}
}
//=============================================================================
public void Draw(ICoordinateSystem cs, DrawingContext dc)
{
if (cs != null && dc != null && m_bFirstPnt_IsSetted)
{
Pen _pen = new Pen(new SolidColorBrush(m_Color), m_Thickness);
PathFigure pf = new PathFigure();
if (!m_bInvalidData && m_bSecondPnt_IsSetted)
{
double scaledRadius = m_rRadius * cs.Get_Scale();
double rFirstAngle = Math.Atan2(m_FirstPnt.Y - m_CenterPnt.Y, m_FirstPnt.X - m_CenterPnt.X);
// Atan2 return result in [-pi, pi]. Convert it to [0, 2pi].
if (rFirstAngle < 0)
{
rFirstAngle += 2 * Math.PI;
}
double rSecondAngle = Math.Atan2(m_SecondPnt.Y - m_CenterPnt.Y, m_SecondPnt.X - m_CenterPnt.X);
if (rSecondAngle < 0)
{
rSecondAngle += 2 * Math.PI;
}
double rThirdAngle = Math.Atan2(m_ThirdPnt.Y - m_CenterPnt.Y, m_ThirdPnt.X - m_CenterPnt.X);
if (rThirdAngle < 0)
{
rThirdAngle += 2 * Math.PI;
}
Point startPnt = m_FirstPnt;
Point endPnt = new Point(0, 0);
SweepDirection sd = SweepDirection.Clockwise;
bool bIsLargeArc = false;
if (rFirstAngle > rSecondAngle)
{
if (rFirstAngle > rThirdAngle)
{
if (rSecondAngle > rThirdAngle)
{
endPnt = m_ThirdPnt;
sd = SweepDirection.Clockwise;
//sd = SweepDirection.Counterclockwise;
bIsLargeArc = (rFirstAngle - rThirdAngle) >= Math.PI;
}
else
{
endPnt = m_ThirdPnt;
sd = SweepDirection.Counterclockwise;
//sd = SweepDirection.Clockwise;
bIsLargeArc = (2 * Math.PI - (rFirstAngle - rThirdAngle)) >= Math.PI;
}
}
else
{
endPnt = m_ThirdPnt;
sd = SweepDirection.Clockwise;
//sd = SweepDirection.Counterclockwise;
double rDiff = rFirstAngle - rThirdAngle;
rDiff += 2 * Math.PI;
bIsLargeArc = rDiff >= Math.PI;
}
}
else
{
if (rFirstAngle > rThirdAngle)
{
endPnt = m_ThirdPnt;
sd = SweepDirection.Counterclockwise;
//sd = SweepDirection.Clockwise;
double rDiff = rFirstAngle - rThirdAngle;
rDiff -= 2 * Math.PI;
bIsLargeArc = Math.Abs(rDiff) >= Math.PI;
}
else
{
if (rSecondAngle > rThirdAngle)
{
endPnt = m_ThirdPnt;
sd = SweepDirection.Clockwise;
//sd = SweepDirection.Counterclockwise;
double rDiff = rFirstAngle - rThirdAngle;
rDiff += 2 * Math.PI;
bIsLargeArc = Math.Abs(rDiff) >= Math.PI;
}
else
{
endPnt = m_ThirdPnt;
sd = SweepDirection.Counterclockwise;
//sd = SweepDirection.Clockwise;
double rDiff = rFirstAngle - rThirdAngle;
//if (true || rDiff > 0)
// rDiff += 2 * Math.PI;
bIsLargeArc = Math.Abs(rDiff) >= Math.PI;
}
}
}
pf.StartPoint = cs.GetLocalPoint(startPnt);
// draw arc
pf.Segments.Add(new ArcSegment(cs.GetLocalPoint(endPnt), new Size(scaledRadius, scaledRadius), 0, bIsLargeArc, sd, true));
// DEBUG INFO
if (false)
{
string str = string.Format("{0:F2}, {1:F2}, {2:F2}", rFirstAngle, rSecondAngle, rThirdAngle);
Debug.WriteLine(str);
Vector vec = new Vector(4.0, 4.0);
Point pnt = cs.GetLocalPoint(m_SecondPnt);
Point pnt1 = pnt - vec;
Point pnt2 = pnt + vec;
Rect rect = new Rect(pnt1, pnt2);
dc.DrawRectangle(Brushes.Aqua, _pen, rect);
pnt = cs.GetLocalPoint(m_CenterPnt);
pnt1 = pnt - vec;
pnt2 = pnt + vec;
rect = new Rect(pnt1, pnt2);
dc.DrawRectangle(Brushes.Red, _pen, rect);
dc.DrawEllipse(null, new Pen(new SolidColorBrush(Colors.Red), 3), cs.GetLocalPoint(m_CenterPnt), scaledRadius, scaledRadius);
}
}
else
{
pf.StartPoint = cs.GetLocalPoint(m_FirstPnt);
// draw line
pf.Segments.Add(new LineSegment(cs.GetLocalPoint(m_SecondPnt), true));
}
PathGeometry pg = new PathGeometry(new[] { pf });
dc.DrawGeometry(null, _pen, pg);
}
}