internal void ArcFor(PDFUnit rx, PDFUnit ry, double ang, PathArcSize size, PathArcSweep sweep, PDFPoint enddelta)
{
PDFPoint end = ConvertDeltaToActual(enddelta);
PathArcData arc = new PathArcData()
{
RadiusX = rx, RadiusY = ry, XAxisRotation = ang, ArcSize = size, ArcSweep = sweep, EndPoint = end
};
CurrentPath.Add(arc);
IEnumerable <PathBezierCurveData> curves = PathDataHelper.GetBezierCurvesForArc(this.Cursor, arc);
foreach (PathBezierCurveData bez in curves)
{
IncludeInBounds(bez.EndPoint);
if (bez.HasStartHandle)
{
IncludeInBounds(bez.StartHandle);
}
if (bez.HasEndHandle)
{
IncludeInBounds(bez.EndHandle);
}
}
Cursor = end;
}
internal static IEnumerable <PathBezierCurveData> GetBezierCurvesForArc(PDFPoint start, PathArcData arc)
{
List <PathBezierCurveData> all = new List <PathBezierCurveData>();
try
{
if (start == arc.EndPoint)
{
return(all);
}
if (arc.RadiusX == 0.0f && arc.RadiusY == 0.0f)
{
PathBezierCurveData data = new PathBezierCurveData(arc.EndPoint, start, arc.EndPoint, false, false);
all.Add(data);
return(all);
}
double sinPhi = Math.Sin(arc.XAxisRotation.PointsValue * PathDataHelper.RadiansPerDegree);
double cosPhi = Math.Cos(arc.XAxisRotation.PointsValue * PathDataHelper.RadiansPerDegree);
double x1dash = cosPhi * (start.X.PointsValue - arc.EndPoint.X.PointsValue) / 2.0 + sinPhi * (start.Y.PointsValue - arc.EndPoint.Y.PointsValue) / 2.0;
double y1dash = -sinPhi * (start.X.PointsValue - arc.EndPoint.X.PointsValue) / 2.0 + cosPhi * (start.Y.PointsValue - arc.EndPoint.Y.PointsValue) / 2.0;
double root;
double numerator = arc.RadiusX.PointsValue * arc.RadiusX.PointsValue * arc.RadiusY.PointsValue * arc.RadiusY.PointsValue
- arc.RadiusX.PointsValue * arc.RadiusX.PointsValue * y1dash * y1dash
- arc.RadiusY.PointsValue * arc.RadiusY.PointsValue * x1dash * x1dash;
double rx = arc.RadiusX.PointsValue;
double ry = arc.RadiusY.PointsValue;
if (numerator < 0.0)
{
double s = (double)Math.Sqrt(1.0 - numerator / (arc.RadiusX.PointsValue * arc.RadiusX.PointsValue * arc.RadiusY.PointsValue * arc.RadiusY.PointsValue));
rx *= s;
ry *= s;
root = 0.0;
}
else
{
root = ((arc.ArcSize == PathArcSize.Large && arc.ArcSweep == PathArcSweep.Positive) || (arc.ArcSize == PathArcSize.Small && arc.ArcSweep == PathArcSweep.Negative) ? -1.0 : 1.0)
* Math.Sqrt(numerator / (arc.RadiusX.PointsValue * arc.RadiusX.PointsValue * y1dash * y1dash + arc.RadiusY.PointsValue * arc.RadiusY.PointsValue * x1dash * x1dash));
}
double cxdash = root * rx * y1dash / ry;
double cydash = -root * ry * x1dash / rx;
double cx = cosPhi * cxdash - sinPhi * cydash + (start.X.PointsValue + arc.EndPoint.X.PointsValue) / 2.0;
double cy = sinPhi * cxdash + cosPhi * cydash + (start.Y.PointsValue + arc.EndPoint.Y.PointsValue) / 2.0;
double theta1 = PathDataHelper.CalculateVectorAngle(1.0, 0.0, (x1dash - cxdash) / rx, (y1dash - cydash) / ry);
double dtheta = PathDataHelper.CalculateVectorAngle((x1dash - cxdash) / rx, (y1dash - cydash) / ry, (-x1dash - cxdash) / rx, (-y1dash - cydash) / ry);
if (arc.ArcSweep == PathArcSweep.Negative && dtheta > 0)
{
dtheta -= 2.0 * Math.PI;
}
else if (arc.ArcSweep == PathArcSweep.Positive && dtheta < 0)
{
dtheta += 2.0 * Math.PI;
}
int segments = (int)Math.Ceiling((double)Math.Abs(dtheta / (Math.PI / 2.0)));
double delta = dtheta / segments;
double t = 8.0 / 3.0 * Math.Sin(delta / 4.0) * Math.Sin(delta / 4.0) / Math.Sin(delta / 2.0);
double startX = start.X.PointsValue;
double startY = start.Y.PointsValue;
for (int i = 0; i < segments; ++i)
{
double cosTheta1 = Math.Cos(theta1);
double sinTheta1 = Math.Sin(theta1);
double theta2 = theta1 + delta;
double cosTheta2 = Math.Cos(theta2);
double sinTheta2 = Math.Sin(theta2);
double endpointX = cosPhi * rx * cosTheta2 - sinPhi * ry * sinTheta2 + cx;
double endpointY = sinPhi * rx * cosTheta2 + cosPhi * ry * sinTheta2 + cy;
double dx1 = t * (-cosPhi * rx * sinTheta1 - sinPhi * ry * cosTheta1);
double dy1 = t * (-sinPhi * rx * sinTheta1 + cosPhi * ry * cosTheta1);
double dxe = t * (cosPhi * rx * sinTheta2 + sinPhi * ry * cosTheta2);
double dye = t * (sinPhi * rx * sinTheta2 - cosPhi * ry * cosTheta2);
PDFPoint endPoint = new PDFPoint(endpointX, endpointY);
PDFPoint startHandle = new PDFPoint((startX + dx1), (startY + dy1));
PDFPoint endHandle = new PDFPoint((endpointX + dxe), (endpointY + dye));
PathBezierCurveData bezier = new PathBezierCurveData(endPoint, startHandle, endHandle, true, true);
all.Add(bezier);
theta1 = theta2;
startX = (float)endpointX;
startY = (float)endpointY;
}
}
catch (Exception ex)
{
throw new PDFException(Errors.CouldNotBuildPathFromArc, ex);
}
return(all);
}
private void RenderPathOp(PathData data, PDFPoint location, ref PDFPoint cursor)
{
switch (data.Type)
{
case PathDataType.Move:
PathMoveData move = (PathMoveData)data;
cursor = move.MoveTo;
this.RenderMoveTo(move.MoveTo.X + location.X, move.MoveTo.Y + location.Y);
break;
case PathDataType.Line:
PathLineData line = (PathLineData)data;
cursor = line.LineTo;
this.RenderLineTo(line.LineTo.X + location.X, line.LineTo.Y + location.Y);
break;
case PathDataType.Rect:
PathRectData rect = (PathRectData)data;
cursor = rect.Rect.Location;
this.RenderRectangle(rect.Rect.X + location.X, rect.Rect.Y + location.Y, rect.Rect.Width, rect.Rect.Height);
break;
case PathDataType.SubPath:
PathSubPathData sub = (PathSubPathData)data;
this.RenderPathData(location, sub.InnerPath, ref cursor);
break;
case PathDataType.Bezier:
PathBezierCurveData bez = (PathBezierCurveData)data;
cursor = bez.EndPoint;
if (bez.HasStartHandle && bez.HasEndHandle)
{
this.RenderBezierCurveTo(bez.EndPoint.X + location.X, bez.EndPoint.Y + location.Y,
bez.StartHandle.X + location.X, bez.StartHandle.Y + location.Y,
bez.EndHandle.X + location.X, bez.EndHandle.Y + location.Y);
}
else if (bez.HasStartHandle)
{
this.RenderBezierCurveToWithStartHandleOnly(bez.EndPoint.X + location.X, bez.EndPoint.Y + location.Y,
bez.StartHandle.X + location.X, bez.StartHandle.Y + location.Y);
}
else if (bez.HasEndHandle)
{
this.RenderBezierCurveToWithEndHandleOnly(bez.EndPoint.X + location.X, bez.EndPoint.Y + location.Y,
bez.EndHandle.X + location.X, bez.EndHandle.Y + location.Y);
}
else
{
this.RenderLineTo(bez.Points[2].X, bez.Points[2].Y);
}
break;
case PathDataType.Arc:
IEnumerable <PathBezierCurveData> segments;
PathArcData arc = (PathArcData)data;
segments = PathDataHelper.GetBezierCurvesForArc(cursor, arc);
foreach (PathBezierCurveData segment in segments)
{
this.RenderBezierCurveTo(segment.EndPoint.X + location.X,
segment.EndPoint.Y + location.Y,
segment.StartHandle.X + location.X,
segment.StartHandle.Y + location.Y,
segment.EndHandle.X + location.X,
segment.EndHandle.Y + location.Y);
}
cursor = arc.EndPoint;
break;
case PathDataType.Quadratic:
IEnumerable <PathBezierCurveData> quadSegments;
PathQuadraticCurve quad = (PathQuadraticCurve)data;
quadSegments = PathDataHelper.GetBezierCurvesForQuadratic(cursor, quad);
foreach (PathBezierCurveData quadSeg in quadSegments)
{
this.RenderBezierCurveTo(quadSeg.EndPoint.X + location.X, quadSeg.EndPoint.Y + location.Y,
quadSeg.StartHandle.X + location.X, quadSeg.StartHandle.Y + location.Y,
quadSeg.EndHandle.X + location.X, quadSeg.EndHandle.Y + location.Y);
}
cursor = quad.EndPoint;
break;
case PathDataType.Close:
this.RenderClosePathOp();
cursor = PDFPoint.Empty;
break;
default:
throw new ArgumentOutOfRangeException("data.Type");
}
}
