/// <summary>Filter a PathRenderInfo object</summary>
/// <param name="path">the PathRenderInfo object to be filtered</param>
public virtual Path FilterStrokePath(PathRenderInfo path)
{
PdfArray dashPattern = path.GetLineDashPattern();
LineDashPattern lineDashPattern = new LineDashPattern(dashPattern.GetAsArray(0), dashPattern.GetAsNumber(1
).FloatValue());
return(FilterStrokePath(path.GetPath(), path.GetCtm(), path.GetLineWidth(), path.GetLineCapStyle(), path.GetLineJoinStyle
(), path.GetMiterLimit(), lineDashPattern));
}
/// <summary>Apply a LineDashPattern along a Path</summary>
/// <param name="path">input path</param>
/// <param name="lineDashPattern">input LineDashPattern</param>
/// <returns>a dashed Path</returns>
public static Path ApplyDashPattern(Path path, LineDashPattern lineDashPattern)
{
ICollection <int> modifiedSubpaths = new HashSet <int>(path.ReplaceCloseWithLine());
Path dashedPath = new Path();
int currentSubpath = 0;
foreach (Subpath subpath in path.GetSubpaths())
{
IList <Point> subpathApprox = subpath.GetPiecewiseLinearApproximation();
if (subpathApprox.Count > 1)
{
dashedPath.MoveTo((float)subpathApprox[0].GetX(), (float)subpathApprox[0].GetY());
float remainingDist = 0;
bool remainingIsGap = false;
for (int i = 1; i < subpathApprox.Count; ++i)
{
Point nextPoint = null;
if (remainingDist != 0)
{
nextPoint = GetNextPoint(subpathApprox[i - 1], subpathApprox[i], remainingDist);
remainingDist = ApplyDash(dashedPath, subpathApprox[i - 1], subpathApprox[i], nextPoint, remainingIsGap);
}
while (JavaUtil.FloatCompare(remainingDist, 0) == 0 && !dashedPath.GetCurrentPoint().Equals(subpathApprox[
i]))
{
LineDashPattern.DashArrayElem currentElem = lineDashPattern.Next();
nextPoint = GetNextPoint(nextPoint != null ? nextPoint : subpathApprox[i - 1], subpathApprox[i], currentElem
.GetVal());
remainingDist = ApplyDash(dashedPath, subpathApprox[i - 1], subpathApprox[i], nextPoint, currentElem.IsGap
());
remainingIsGap = currentElem.IsGap();
}
}
// If true, then the line closing the subpath was explicitly added (see Path.ReplaceCloseWithLine).
// This causes a loss of a visual effect of line join style parameter, so in this clause
// we simply add overlapping dash (or gap, no matter), which continues the last dash and equals to
// the first dash (or gap) of the path.
if (modifiedSubpaths.Contains(currentSubpath))
{
lineDashPattern.Reset();
LineDashPattern.DashArrayElem currentElem = lineDashPattern.Next();
Point nextPoint = GetNextPoint(subpathApprox[0], subpathApprox[1], currentElem.GetVal());
ApplyDash(dashedPath, subpathApprox[0], subpathApprox[1], nextPoint, currentElem.IsGap());
}
}
// According to PDF spec. line dash pattern should be restarted for each new subpath.
lineDashPattern.Reset();
++currentSubpath;
}
return(dashedPath);
}
private Path FilterStrokePath(Path sourcePath, Matrix ctm, float lineWidth, int lineCapStyle, int lineJoinStyle
, float miterLimit, LineDashPattern lineDashPattern)
{
Path path = sourcePath;
JoinType joinType = ClipperBridge.GetJoinType(lineJoinStyle);
EndType endType = ClipperBridge.GetEndType(lineCapStyle);
if (lineDashPattern != null)
{
if (!lineDashPattern.IsSolid())
{
path = LineDashPattern.ApplyDashPattern(path, lineDashPattern);
}
}
ClipperOffset offset = new ClipperOffset(miterLimit, PdfCleanUpTool.arcTolerance * PdfCleanUpTool.floatMultiplier
);
IList <Subpath> degenerateSubpaths = ClipperBridge.AddPath(offset, path, joinType, endType);
PolyTree resultTree = new PolyTree();
offset.Execute(ref resultTree, lineWidth * PdfCleanUpTool.floatMultiplier / 2);
Path offsetedPath = ClipperBridge.ConvertToPath(resultTree);
if (degenerateSubpaths.Count > 0)
{
if (endType == EndType.OPEN_ROUND)
{
IList <Subpath> circles = ConvertToCircles(degenerateSubpaths, lineWidth / 2);
offsetedPath.AddSubpaths(circles);
}
else
{
if (endType == EndType.OPEN_SQUARE && lineDashPattern != null)
{
IList <Subpath> squares = ConvertToSquares(degenerateSubpaths, lineWidth, sourcePath);
offsetedPath.AddSubpaths(squares);
}
}
}
return(FilterFillPath(offsetedPath, ctm, PdfCanvasConstants.FillingRule.NONZERO_WINDING));
}
/// <summary>Construct a new DashArrayElem object</summary>
/// <param name="val">the length of the dash array element</param>
/// <param name="isGap">whether this element indicates a gap, or a stroke</param>
internal DashArrayElem(LineDashPattern _enclosing, float val, bool isGap)
{
this._enclosing = _enclosing;
this.val = val;
this.isGap = isGap;
}
