public override void SetGripPointAt(int index, GripPoint gripPoint, CADPoint newPosition)
{
if (index == 0)
{
_center = newPosition;
}
else if (index >= 1 && index <= 3)
{
CADPoint startPoint = this.startPoint;
CADPoint endPoint = this.endPoint;
CADPoint middlePoint = this.middlePoint;
if (index == 1)
{
startPoint = newPosition;
middlePoint = (CADPoint)gripPoint.xData1;
}
else if (index == 2)
{
endPoint = newPosition;
middlePoint = (CADPoint)gripPoint.xData1;
}
else if (index == 3)
{
middlePoint = newPosition;
}
Circle2 newCircle = Circle2.From3Points(
startPoint, middlePoint, endPoint);
if (newCircle.radius > 0)
{
CADVector xPositive = new CADVector(1, 0);
double startAngle = CADVector.SignedAngleInRadian(xPositive,
startPoint - newCircle.center);
double endAngle = CADVector.SignedAngleInRadian(xPositive,
endPoint - newCircle.center);
double middleAngle = CADVector.SignedAngleInRadian(xPositive,
middlePoint - newCircle.center);
startAngle = MathUtils.NormalizeRadianAngle(startAngle);
endAngle = MathUtils.NormalizeRadianAngle(endAngle);
middleAngle = MathUtils.NormalizeRadianAngle(middleAngle);
_center = newCircle.center;
_radius = newCircle.radius;
if (AngleInArcRange(middleAngle, startAngle, endAngle))
{
this.startAngle = startAngle;
this.endAngle = endAngle;
}
else
{
this.startAngle = endAngle;
this.endAngle = startAngle;
}
}
}
}