/// <summary>
/// 根据圆心，圆上起始点，结束点及圆的时针方向计算圆弧凸度
/// </summary>
/// <param name="center">圆心</param>
/// <param name="startPoint">起始点</param>
/// <param name="endPoint">结束点</param>
/// <param name="clockwise">时针方向</param>
/// <returns></returns>
public static double GetBulgeFromTwoPointsAndCenter(UnitPoint center, UnitPoint startPoint, UnitPoint endPoint, bool clockwise)
{
double startAngle = HitUtil.LineAngleR(center, startPoint, 0);
double endAngle = HitUtil.LineAngleR(center, endPoint, 0);
double sweepAngle = HitUtil.CalAngleSweep(HitUtil.RadiansToDegrees(startAngle), HitUtil.RadiansToDegrees(endAngle), clockwise);
sweepAngle = Math.Abs(HitUtil.DegreesToRadians(sweepAngle) / 4);
double bulge = Math.Tan(sweepAngle);
bulge = clockwise ? -bulge : bulge;
return(bulge);
}
private static double IsCorrectCenter(UnitPoint center, double radius, double bulge, UnitPoint p1, UnitPoint p2)
{
double startAngle = HitUtil.RadiansToDegrees(HitUtil.LineAngleR(center, p1, 0));
double endAngle = HitUtil.RadiansToDegrees(HitUtil.LineAngleR(center, p2, 0));
bool clockwise = bulge >= 0 ? false : true;
double sweepAngle = HitUtil.CalAngleSweep(startAngle, endAngle, clockwise);
double midAngle = startAngle + sweepAngle / 2;
UnitPoint midPoint = new UnitPoint(radius * Math.Cos(HitUtil.DegreesToRadians(midAngle)) + center.X, radius * Math.Sin(HitUtil.DegreesToRadians(midAngle)) + center.Y);
double temp = BulgeToDegree(bulge);
return(Math.Abs(temp - Math.Abs(sweepAngle)));
}
public static UnitPoint GetBulgeMidPoint(UnitPoint p1, UnitPoint p2, double bulge)
{
bool clockwise = bulge >= 0 ? false : true;
UnitPoint center = GetCenterByBulgeAndTwoPoints(p1, p2, bulge);
float radius = (float)HitUtil.Distance(center, p1);
float startAngle = (float)HitUtil.RadiansToDegrees(HitUtil.LineAngleR(center, p1, 0));
float EndAngle = (float)HitUtil.RadiansToDegrees(HitUtil.LineAngleR(center, p2, 0));
float sweepAngle = (float)HitUtil.CalAngleSweep(startAngle, EndAngle, clockwise);
float midAngle = startAngle + sweepAngle / 2;
UnitPoint midPoint = new UnitPoint(radius * Math.Cos(HitUtil.DegreesToRadians(midAngle)) + center.X, radius * Math.Sin(HitUtil.DegreesToRadians(midAngle)) + center.Y);
return(midPoint);
}
