public void ReadLeftSide(RawOutline pathW, bool topDown)
{
//read once
if (_leftSideChecked)
{
throw new System.NotSupportedException();
}
_leftSideChecked = true;
if (topDown)
{
int count = _spanList.Count;
RawOutline.BeginLoadSegmentPoints(pathW);
for (int i = 0; i < count; ++i)
{
HSpan span = _spanList[i];
pathW.AppendPoint(span.startX, span.y);
}
RawOutline.EndLoadSegmentPoints(pathW);
}
else
{
RawOutline.BeginLoadSegmentPoints(pathW);
for (int i = _spanList.Count - 1; i >= 0; --i)
{
HSpan span = _spanList[i];
pathW.AppendPoint(span.startX, span.y);
}
RawOutline.EndLoadSegmentPoints(pathW);
}
}
public static void Simplify(this RawOutline rgnOutline, float tolerance = 0.5f, bool heighQualityEnable = false)
{
int j = rgnOutline._contours.Count;
for (int i = 0; i < j; ++i)
{
RawContour contour = rgnOutline._contours[i];
List <Point> simplifiedPoints = new List <Point>(contour._xyCoords.Count);
PixelFarm.CpuBlit.VertexProcessing.SimplificationHelpers.Simplify(
contour._xyCoords,
(p1, p2) => p1 == p2,
p => p.X,
p => p.Y,
simplifiedPoints,
tolerance,
heighQualityEnable);
//replace current raw contour with the new one
#if DEBUG
System.Diagnostics.Debug.WriteLine("simplification before:" + contour._xyCoords.Count + ",after" + simplifiedPoints.Count);
#endif
//create a new raw contour,
//but you can replace internal data of the old contour too,
RawContour newContour = new RawContour();
newContour.IsOutside = contour.IsOutside;
foreach (Point point in simplifiedPoints)
{
newContour.AddPoint(point);
}
rgnOutline._contours[i] = newContour;
}
}
void TraceOutlineCcw(Remaining toReadNext, RawOutline output, bool outside)
{
output.BeginContour(outside);
//if we starts on left-side of the column
ColumnWalkerCcw ccw = new ColumnWalkerCcw(_verticalGroupList);
ccw.Bind(output);
//-------------------------------
for (; ;)
{
switch (toReadNext.unreadSide)
{
default:
throw new System.NotSupportedException();
case ReadSide.Left:
ccw.Bind(toReadNext.column);
ccw.ReadLeftSide();
break;
case ReadSide.Right:
ccw.Bind(toReadNext.column);
ccw.ReadRightSide();
break;
case ReadSide.None:
//complete
output.EndContour();
return;
}
toReadNext = ccw.FindReadNextColumn();
}
}
/// <summary>
/// trace outline counter-clockwise
/// </summary>
/// <param name="output"></param>
void TraceOutline(HSpan[] sortedHSpans, RawOutline output)
{
if (sortedHSpans == null)
{
return;
}
//
var sep = new VerticalGroupSeparator(_verticalGroupList);
sep.Separate(sortedHSpans);
int vertGroupCount = _verticalGroupList.Count;
if (vertGroupCount == 0)
{
return;
}
_verticalGroupList.EvaluateCorners();
List <Remaining> incompleteReadList = new List <Remaining>();
TraceOutlineCcw(new Remaining(_verticalGroupList.GetGroup(0).GetColumn(0), ReadSide.Left), output, true);
TRACE_AGAIN: //**
//check if the shape have hole(s)
_verticalGroupList.CollectIncompleteColumns(incompleteReadList);
if (incompleteReadList.Count > 0)
{
//this should be a hole
Remaining incompleteRead = incompleteReadList[0];
switch (incompleteRead.unreadSide)
{
//?should not occur
case ReadSide.LeftAndRight:
{
TraceOutlineCcw(new Remaining(incompleteRead.column, ReadSide.Left), output, false);
incompleteReadList.Clear();
goto TRACE_AGAIN;
}
case ReadSide.Left:
case ReadSide.Right:
{
TraceOutlineCcw(incompleteRead, output, false);
incompleteReadList.Clear();
goto TRACE_AGAIN;
}
}
}
else
{
//complete all
}
}
public ColumnWalkerCcw(VerticalGroupList verticalGroupList)
{
_pathWriter = null;
_latestReadOnRightSide = false;
_vertGroupList = verticalGroupList;
_vertGroupCount = verticalGroupList.Count;
_currentCol = null;
}
/// <summary>
/// reconstruct regionOutline from internal region data
/// </summary>
/// <param name="rgnOutline"></param>
public static void ReconstructOutline(this ReconstructedRegionData rgnData, RawOutline rgnOutline)
{
var outlineTracer = new OutlineTracer();
outlineTracer.TraceOutline(rgnData, rgnOutline);
}
internal static void EndLoadSegmentPoints(RawOutline rawPath) => rawPath.OnEndLoadSegmentPoints();
internal static void BeginLoadSegmentPoints(RawOutline rawPath) => rawPath.OnBeginLoadSegmentPoints();
public void TraceOutline(ReconstructedRegionData rgnData, RawOutline output)
{
TraceOutline(rgnData.HSpans, output);
}
public void Bind(RawOutline pathW)
{
_pathWriter = pathW;
}