public static IEnumerable <SvgPathSegment> Create(SvgPathSegment lastSegment, string commandString, SvgConverter conv)
{
if (!conv.TrySplitValues(commandString.Substring(1), out var values, true))
{
yield break;
}
int valuePos = 0;
while (valuePos < values.Length)
{
var start = lastSegment?.End ?? Pnt2d.Origin;
Pnt2d c1;
Pnt2d c2;
Pnt2d end;
if (char.ToLower(commandString[0]) == 'c')
{
c1 = new Pnt2d(values[valuePos], values[valuePos + 1]);
c2 = new Pnt2d(values[valuePos + 2], values[valuePos + 3]);
end = new Pnt2d(values[valuePos + 4], values[valuePos + 5]);
valuePos += 6;
if (char.IsLower(commandString[0]))
{
c1 += start;
c2 += start;
end += start;
}
lastSegment = new SvgPathSegCurvetoCubic(start, c1, c2, end);
yield return(lastSegment);
}
else if (char.ToLower(commandString[0]) == 's')
{
c2 = new Pnt2d(values[valuePos], values[valuePos + 1]);
end = new Pnt2d(values[valuePos + 2], values[valuePos + 3]);
valuePos += 4;
if (char.IsLower(commandString[0]))
{
c2 += start;
end += start;
}
if (lastSegment is SvgPathSegCurvetoCubic lastSeg)
{
c1 = lastSeg.C2;
}
else
{
c1 = c2;
}
lastSegment = new SvgPathSegCurvetoCubic(start, c1, c2, end);
yield return(lastSegment);
}
}
}
//--------------------------------------------------------------------------------------------------
void _ImportCubicCurveSegment(SvgPathSegCurvetoCubic svgSegment, ref int startPoint)
{
var endPoint = _AddPoint(svgSegment.End);
var controlPoint1 = _AddPoint(svgSegment.C1);
var controlPoint2 = _AddPoint(svgSegment.C2);
_Segments.Add(new SketchSegmentBezier(startPoint, controlPoint1, controlPoint2, endPoint));
startPoint = endPoint;
}
internal static IEnumerable <SvgPathSegment> Create(string pathString, SvgConverter conv)
{
SvgPathSegment lastSegment = null;
SvgPathSegment firstSegment = null;
int next = 0;
while (next < pathString.Length)
{
int start = next;
next = pathString.IndexOfAny(_PathCommands, start + 1);
if (next == -1)
{
next = pathString.Length;
}
IEnumerable <SvgPathSegment> newSegments = null;
var commandString = pathString.Substring(start, next - start);
switch (char.ToLower(commandString[0]))
{
case 'm':
newSegments = SvgPathSegMoveto.Create(lastSegment, commandString, conv);
break;
case 'l':
case 'h':
case 'v':
newSegments = SvgPathSegLineto.Create(lastSegment, commandString, conv);
break;
case 'c':
case 's':
newSegments = SvgPathSegCurvetoCubic.Create(lastSegment, commandString, conv);
break;
case 'q':
case 't':
newSegments = SvgPathSegCurvetoQuadratic.Create(lastSegment, commandString, conv);
break;
case 'a':
newSegments = SvgPathSegArc.Create(lastSegment, commandString, conv);
break;
case 'z':
lastSegment = SvgPathSegClosePath.Create(firstSegment, lastSegment);
yield return(lastSegment);
firstSegment = null;
continue;
}
if (newSegments == null)
{
continue;
}
foreach (var segment in newSegments)
{
if (firstSegment == null)
{
firstSegment = segment;
}
lastSegment = segment;
yield return(segment);
}
}
}