public static SKPath AsSkiaPathFromSegment(this PathF target, int segmentIndex, float ppu, float zoom)
{
ppu = zoom * ppu;
var path = new SKPath();
var type = target.GetSegmentType(segmentIndex);
if (type == PathOperation.Line)
{
var pointIndex = target.GetSegmentPointIndex(segmentIndex);
var startPoint = target[pointIndex - 1];
path.MoveTo(startPoint.X * ppu, startPoint.Y * ppu);
var endPoint = target[pointIndex];
path.LineTo(endPoint.X * ppu, endPoint.Y * ppu);
}
else if (type == PathOperation.Quad)
{
var pointIndex = target.GetSegmentPointIndex(segmentIndex);
var startPoint = target[pointIndex - 1];
path.MoveTo(startPoint.X * ppu, startPoint.Y * ppu);
var controlPoint = target[pointIndex++];
var endPoint = target[pointIndex];
path.QuadTo(controlPoint.X * ppu, controlPoint.Y * ppu, endPoint.X * ppu, endPoint.Y * ppu);
}
else if (type == PathOperation.Cubic)
{
var pointIndex = target.GetSegmentPointIndex(segmentIndex);
var startPoint = target[pointIndex - 1];
path.MoveTo(startPoint.X * ppu, startPoint.Y * ppu);
var controlPoint1 = target[pointIndex++];
var controlPoint2 = target[pointIndex++];
var endPoint = target[pointIndex];
path.CubicTo(controlPoint1.X * ppu, controlPoint1.Y * ppu, controlPoint2.X * ppu, controlPoint2.Y * ppu, endPoint.X * ppu, endPoint.Y * ppu);
}
else if (type == PathOperation.Arc)
{
target.GetSegmentInfo(segmentIndex, out var pointIndex, out var arcAngleIndex, out var arcClockwiseIndex);
var topLeft = target[pointIndex++];
var bottomRight = target[pointIndex];
var startAngle = target.GetArcAngle(arcAngleIndex++);
var endAngle = target.GetArcAngle(arcAngleIndex);
var clockwise = target.GetArcClockwise(arcClockwiseIndex);
while (startAngle < 0)
{
startAngle += 360;
}
while (endAngle < 0)
{
endAngle += 360;
}
var rect = new SKRect(topLeft.X, topLeft.Y, bottomRight.X, bottomRight.Y);
var sweep = Geometry.GetSweep(startAngle, endAngle, clockwise);
startAngle *= -1;
if (!clockwise)
{
sweep *= -1;
}
path.AddArc(rect, startAngle, sweep);
}
return(path);
}
public static CanvasGeometry AsPathFromSegment(this PathF path, int segmentIndex, float zoom, ICanvasResourceCreator creator)
{
float scale = 1 / zoom;
var builder = new CanvasPathBuilder(creator);
var type = path.GetSegmentType(segmentIndex);
if (type == PathOperation.Line)
{
int segmentStartingPointIndex = path.GetSegmentPointIndex(segmentIndex);
var startPoint = path[segmentStartingPointIndex - 1];
builder.BeginFigure(startPoint.X * scale, startPoint.Y * scale, CanvasFigureFill.Default);
var point = path[segmentStartingPointIndex];
builder.AddLine(point.X * scale, point.Y * scale);
}
else if (type == PathOperation.Quad)
{
int segmentStartingPointIndex = path.GetSegmentPointIndex(segmentIndex);
var startPoint = path[segmentStartingPointIndex - 1];
builder.BeginFigure(startPoint.X * scale, startPoint.Y * scale, CanvasFigureFill.Default);
var controlPoint = path[segmentStartingPointIndex++];
var endPoint = path[segmentStartingPointIndex];
builder.AddQuadraticBezier(
new Vector2(controlPoint.X * scale, controlPoint.Y * scale),
new Vector2(endPoint.X * scale, endPoint.Y * scale));
}
else if (type == PathOperation.Cubic)
{
int segmentStartingPointIndex = path.GetSegmentPointIndex(segmentIndex);
var startPoint = path[segmentStartingPointIndex - 1];
builder.BeginFigure(startPoint.X * scale, startPoint.Y * scale, CanvasFigureFill.Default);
var controlPoint1 = path[segmentStartingPointIndex++];
var controlPoint2 = path[segmentStartingPointIndex++];
var endPoint = path[segmentStartingPointIndex];
builder.AddCubicBezier(
new Vector2(controlPoint1.X * scale, controlPoint1.Y * scale),
new Vector2(controlPoint2.X * scale, controlPoint2.Y * scale),
new Vector2(endPoint.X * scale, endPoint.Y * scale));
}
else if (type == PathOperation.Arc)
{
path.GetSegmentInfo(segmentIndex, out var pointIndex, out var arcAngleIndex, out var arcClockwiseIndex);
var topLeft = path[pointIndex++];
var bottomRight = path[pointIndex];
var startAngle = path.GetArcAngle(arcAngleIndex++);
var endAngle = path.GetArcAngle(arcAngleIndex);
var clockwise = path.GetArcClockwise(arcClockwiseIndex);
while (startAngle < 0)
{
startAngle += 360;
}
while (endAngle < 0)
{
endAngle += 360;
}
var rotation = Geometry.GetSweep(startAngle, endAngle, clockwise);
var absRotation = Math.Abs(rotation);
var rectX = topLeft.X * scale;
var rectY = topLeft.Y * scale;
var rectWidth = (bottomRight.X * scale) - rectX;
var rectHeight = (bottomRight.Y * scale) - rectY;
var startPoint = Geometry.EllipseAngleToPoint(rectX, rectY, rectWidth, rectHeight, -startAngle);
var endPoint = Geometry.EllipseAngleToPoint(rectX, rectY, rectWidth, rectHeight, -endAngle);
builder.BeginFigure(startPoint.X * scale, startPoint.Y * scale, CanvasFigureFill.Default);
builder.AddArc(
new Vector2(endPoint.X, endPoint.Y),
rectWidth / 2,
rectHeight / 2,
0,
clockwise ? CanvasSweepDirection.Clockwise : CanvasSweepDirection.CounterClockwise,
absRotation >= 180 ? CanvasArcSize.Large : CanvasArcSize.Small
);
}
builder.EndFigure(CanvasFigureLoop.Open);
return(CanvasGeometry.CreatePath(builder));
}
public static CGPath AsCGPathFromSegment(
this PathF target,
int segmentIndex,
float ppu,
float zoom)
{
ppu = ppu * zoom;
var path = new CGPath();
var type = target.GetSegmentType(segmentIndex);
if (type == PathOperation.Line)
{
var pointIndex = target.GetSegmentPointIndex(segmentIndex);
var startPoint = target[pointIndex - 1];
path.MoveToPoint(startPoint.X * ppu, startPoint.Y * ppu);
var endPoint = target[pointIndex];
path.AddLineToPoint(endPoint.X * ppu, endPoint.Y * ppu);
}
else if (type == PathOperation.Quad)
{
var pointIndex = target.GetSegmentPointIndex(segmentIndex);
var startPoint = target[pointIndex - 1];
path.MoveToPoint(startPoint.X * ppu, startPoint.Y * ppu);
var controlPoint = target[pointIndex++];
var endPoint = target[pointIndex];
path.AddQuadCurveToPoint(controlPoint.X * ppu, controlPoint.Y * ppu, endPoint.X * ppu, endPoint.Y * ppu);
}
else if (type == PathOperation.Cubic)
{
var pointIndex = target.GetSegmentPointIndex(segmentIndex);
var startPoint = target[pointIndex - 1];
path.MoveToPoint(startPoint.X * ppu, startPoint.Y * ppu);
var controlPoint1 = target[pointIndex++];
var controlPoint2 = target[pointIndex++];
var endPoint = target[pointIndex];
path.AddCurveToPoint(controlPoint1.X * ppu, controlPoint1.Y * ppu, controlPoint2.X * ppu, controlPoint2.Y * ppu, endPoint.X * ppu, endPoint.Y * ppu);
}
else if (type == PathOperation.Arc)
{
target.GetSegmentInfo(segmentIndex, out var pointIndex, out var arcAngleIndex, out var arcClockwiseIndex);
var topLeft = target[pointIndex++];
var bottomRight = target[pointIndex++];
var startAngle = target.GetArcAngle(arcAngleIndex++);
var endAngle = target.GetArcAngle(arcAngleIndex++);
var clockwise = target.GetArcClockwise(arcClockwiseIndex++);
var startAngleInRadians = Geometry.DegreesToRadians(-startAngle);
var endAngleInRadians = Geometry.DegreesToRadians(-endAngle);
while (startAngleInRadians < 0)
{
startAngleInRadians += (float)Math.PI * 2;
}
while (endAngleInRadians < 0)
{
endAngleInRadians += (float)Math.PI * 2;
}
var cx = (bottomRight.X + topLeft.X) / 2;
var cy = (bottomRight.Y + topLeft.Y) / 2;
var width = bottomRight.X - topLeft.X;
var height = bottomRight.Y - topLeft.Y;
var r = width / 2;
var transform = CGAffineTransform.MakeTranslation(cx * ppu, cy * ppu);
transform = CGAffineTransform.Multiply(CGAffineTransform.MakeScale(1, height / width), transform);
path.AddArc(transform, 0, 0, r * ppu, startAngleInRadians, endAngleInRadians, !clockwise);
}
return(path);
}