public override void ArcTo(Point point, Size size, double rotationAngle, bool isLargeArc, SweepDirection sweepDirection, bool isStroked, bool isSmoothJoin)
{
if (size.Width != size.Height)
{
throw new NotImplementedException("The arc must be based on a circle, not an ellipse.");
}
var startPoint = _points.Last();
var endPoint = point;
var radius = size.Width;
var sign = isLargeArc != (sweepDirection == SweepDirection.Clockwise);
var center = CenterFromPointsAndRadius(startPoint, endPoint, radius, sign);
var startAngle = Atan2(startPoint.Y - center.Y, startPoint.X - center.X);
var endAngle = Atan2(endPoint.Y - center.Y, endPoint.X - center.X);
var circle = new Rect(center.X - radius, center.Y - radius, radius * 2, radius * 2);
#if __IOS__
bezierPath.AddArc(
center,
(nfloat)radius,
(nfloat)startAngle,
(nfloat)endAngle,
sweepDirection == SweepDirection.Clockwise
);
#elif __MACOS__
bezierPath.AppendPathWithArc(center,
(nfloat)radius,
(nfloat)startAngle,
(nfloat)endAngle,
sweepDirection == SweepDirection.Clockwise);
#elif __ANDROID__
var sweepAngle = endAngle - startAngle;
// Convert to degrees
startAngle = startAngle * (180 / PI);
sweepAngle = sweepAngle * (180 / PI);
// Invert y-axis
startAngle = (startAngle + 360) % 360;
sweepAngle = (sweepAngle + 360) % 360;
// Apply direction
if (sweepDirection == SweepDirection.Counterclockwise)
{
sweepAngle -= 360;
}
bezierPath.ArcTo(
circle.LogicalToPhysicalPixels().ToRectF(),
(float)startAngle,
(float)sweepAngle
);
#endif
_points.Add(point);
}
public override void ArcTo(Point point, Size size, double rotationAngle, bool isLargeArc, SweepDirection sweepDirection, bool isStroked, bool isSmoothJoin)
{
if (size.Width != size.Height)
{
throw new NotImplementedException("The arc must be based on a circle, not an ellipse.");
}
var startPoint = _points.Last();
var endPoint = point;
var radius = size.Width;
var sign = isLargeArc != (sweepDirection == SweepDirection.Clockwise);
var center = CenterFromPointsAndRadius(startPoint, endPoint, radius, sign);
var startAngle = Atan2(startPoint.Y - center.Y, startPoint.X - center.X);
var endAngle = Atan2(endPoint.Y - center.Y, endPoint.X - center.X);
var circle = new Rect(center.X - radius, center.Y - radius, radius * 2, radius * 2);
#if __IOS__
bezierPath.AddArc(
center,
(nfloat)radius,
(nfloat)startAngle,
(nfloat)endAngle,
sweepDirection == SweepDirection.Clockwise
);
#elif __MACOS__
//Ugly workaround. check if all vars are defined
if (!double.IsNaN(radius) && !double.IsNaN(startAngle) && !double.IsNaN(endAngle))
{
//Convert to degrees in a 0 =< x =< 360 deg range
startAngle = MathEx.ToDegreeNormalized(startAngle);
endAngle = MathEx.ToDegreeNormalized(endAngle);
bezierPath.AppendPathWithArc(center,
(nfloat)radius,
(nfloat)startAngle,
(nfloat)endAngle);
//Move to startPoint. To prevent segment being drawn to the startPoint from the end of the arc
bezierPath.MoveTo(startPoint);
}
#elif __ANDROID__
var sweepAngle = endAngle - startAngle;
// Convert to degrees
startAngle = startAngle * (180 / PI);
sweepAngle = sweepAngle * (180 / PI);
// Invert y-axis
startAngle = (startAngle + 360) % 360;
sweepAngle = (sweepAngle + 360) % 360;
// Apply direction
if (sweepDirection == SweepDirection.Counterclockwise)
{
sweepAngle -= 360;
}
bezierPath.ArcTo(
circle.ToRectF(),
(float)startAngle,
(float)sweepAngle
);
#elif __SKIA__
var sweepAngle = endAngle - startAngle;
// Convert to degrees
startAngle = startAngle * (180 / PI);
sweepAngle = sweepAngle * (180 / PI);
// Invert y-axis
startAngle = (startAngle + 360) % 360;
sweepAngle = (sweepAngle + 360) % 360;
// Apply direction
if (sweepDirection == SweepDirection.Counterclockwise)
{
sweepAngle -= 360;
}
bezierPath.Geometry.ArcTo(
new SkiaSharp.SKRect((float)circle.Left, (float)circle.Top, (float)circle.Right, (float)circle.Bottom),
(float)startAngle,
(float)sweepAngle,
false
);
#endif
_points.Add(point);
}