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);
}
}
}