public static GraphicsPathFP CreateArc(int ff_xmin, int ff_ymin, int ff_xmax, int ff_ymax, int ff_startangle, int ff_sweepangle, bool closed, bool standalone)
{
if (ff_sweepangle < 0)
{
ff_startangle += ff_sweepangle;
ff_sweepangle = -ff_sweepangle;
}
int segments = MathFP.Round(MathFP.Div(4 * MathFP.Abs(ff_sweepangle), MathFP.PI)) >> SingleFP.DecimalBits;
if (segments == 0)
{
segments = 1;
}
GraphicsPathFP path = new GraphicsPathFP();
int ff_darg = ff_sweepangle / segments;
int ff_arg = ff_startangle;
int ff_lastcos = MathFP.Cos(ff_startangle);
int ff_lastsin = MathFP.Sin(ff_startangle);
int ff_xc = (ff_xmin + ff_xmax) / 2;
int ff_yc = (ff_ymin + ff_ymax) / 2;
int ff_rx = (ff_xmax - ff_xmin) / 2;
int ff_ry = (ff_ymax - ff_ymin) / 2;
int ff_RXBETA = MathFP.Mul(17381, ff_rx);
int ff_RYBETA = MathFP.Mul(17381, ff_ry);
int ff_currcos, ff_currsin, ff_x1, ff_y1, ff_x2, ff_y2;
if (closed)
{
path.AddMoveTo(new PointFP(ff_xc, ff_yc));
}
for (int i = 1; i <= segments; i++)
{
ff_arg = i == segments?ff_startangle + ff_sweepangle:ff_arg + ff_darg;
ff_currcos = MathFP.Cos(ff_arg);
ff_currsin = MathFP.Sin(ff_arg);
ff_x1 = ff_xc + MathFP.Mul(ff_rx, ff_lastcos);
ff_y1 = ff_yc + MathFP.Mul(ff_ry, ff_lastsin);
ff_x2 = ff_xc + MathFP.Mul(ff_rx, ff_currcos);
ff_y2 = ff_yc + MathFP.Mul(ff_ry, ff_currsin);
if (i == 1)
{
if (closed)
{
path.AddLineTo(new PointFP(ff_x1, ff_y1));
}
else
if (standalone)
{
path.AddMoveTo(new PointFP(ff_x1, ff_y1));
}
}
path.AddCurveTo(
new PointFP(ff_x1 - MathFP.Mul(ff_RXBETA, ff_lastsin), ff_y1 + MathFP.Mul(ff_RYBETA, ff_lastcos)),
new PointFP(ff_x2 + MathFP.Mul(ff_RXBETA, ff_currsin), ff_y2 - MathFP.Mul(ff_RYBETA, ff_currcos)),
new PointFP(ff_x2, ff_y2));
ff_lastcos = ff_currcos;
ff_lastsin = ff_currsin;
}
if (closed)
{
path.AddClose();
}
return(path);
}