private void EnsureFigure()
{
if (!_figureStarted)
{
_context.BeginFigure(_lastStart.AsPointShape(), _isFilled, !_isClosed);
_figureStarted = true;
}
}
/// <summary>
/// Parse a SVG path geometry string.
/// </summary>
/// <param name="context">The geometry context.</param>
/// <param name="pathString">The path geometry string</param>
/// <param name="startIndex">The string start index.</param>
public void Parse(GeometryContext context, string pathString, int startIndex)
{
_context = context;
_pathString = pathString;
_pathLength = pathString.Length;
_curIndex = startIndex;
_secondLastPoint = Point2.FromXY(0, 0);
_lastPoint = Point2.FromXY(0, 0);
_lastStart = Point2.FromXY(0, 0);
_figureStarted = false;
bool first = true;
char last_cmd = ' ';
while (ReadToken())
{
char cmd = _token;
if (first)
{
if ((cmd != 'M') && (cmd != 'm'))
{
InvalidToken();
}
first = false;
}
switch (cmd)
{
case 'm':
case 'M':
_lastPoint = ReadPoint(cmd, !_allowComma);
_context.BeginFigure(_lastPoint.AsPointShape(), _isFilled, !_isClosed);
_figureStarted = true;
_lastStart = _lastPoint;
last_cmd = 'M';
while (IsNumber(_allowComma))
{
_lastPoint = ReadPoint(cmd, !_allowComma);
_context.LineTo(_lastPoint.AsPointShape(), _isStroked, !_isSmoothJoin);
last_cmd = 'L';
}
break;
case 'l':
case 'L':
case 'h':
case 'H':
case 'v':
case 'V':
EnsureFigure();
do
{
switch (cmd)
{
case 'l':
_lastPoint = ReadPoint(cmd, !_allowComma);
break;
case 'L':
_lastPoint = ReadPoint(cmd, !_allowComma);
break;
case 'h':
_lastPoint = Point2.FromXY(_lastPoint.X + ReadNumber(!_allowComma), _lastPoint.Y);
break;
case 'H':
_lastPoint = Point2.FromXY(_lastPoint.X + ReadNumber(!_allowComma), _lastPoint.Y);
break;
case 'v':
_lastPoint = Point2.FromXY(_lastPoint.X, _lastPoint.Y + ReadNumber(!_allowComma));
break;
case 'V':
_lastPoint = Point2.FromXY(_lastPoint.X, _lastPoint.Y + ReadNumber(!_allowComma));
break;
}
_context.LineTo(_lastPoint.AsPointShape(), _isStroked, !_isSmoothJoin);
}while (IsNumber(_allowComma));
last_cmd = 'L';
break;
case 'c':
case 'C':
case 's':
case 'S':
EnsureFigure();
do
{
Point2 p;
if ((cmd == 's') || (cmd == 'S'))
{
if (last_cmd == 'C')
{
p = Reflect();
}
else
{
p = _lastPoint;
}
_secondLastPoint = ReadPoint(cmd, !_allowComma);
}
else
{
p = ReadPoint(cmd, !_allowComma);
_secondLastPoint = ReadPoint(cmd, _allowComma);
}
_lastPoint = ReadPoint(cmd, _allowComma);
_context.CubicBezierTo(
p.AsPointShape(),
_secondLastPoint.AsPointShape(),
_lastPoint.AsPointShape(),
_isStroked,
!_isSmoothJoin);
last_cmd = 'C';
}while (IsNumber(_allowComma));
break;
case 'q':
case 'Q':
case 't':
case 'T':
EnsureFigure();
do
{
if ((cmd == 't') || (cmd == 'T'))
{
if (last_cmd == 'Q')
{
_secondLastPoint = Reflect();
}
else
{
_secondLastPoint = _lastPoint;
}
_lastPoint = ReadPoint(cmd, !_allowComma);
}
else
{
_secondLastPoint = ReadPoint(cmd, !_allowComma);
_lastPoint = ReadPoint(cmd, _allowComma);
}
_context.QuadraticBezierTo(
_secondLastPoint.AsPointShape(),
_lastPoint.AsPointShape(),
_isStroked,
!_isSmoothJoin);
last_cmd = 'Q';
}while (IsNumber(_allowComma));
break;
case 'a':
case 'A':
EnsureFigure();
do
{
double w = ReadNumber(!_allowComma);
double h = ReadNumber(_allowComma);
double rotation = ReadNumber(_allowComma);
bool large = ReadBool();
bool sweep = ReadBool();
_lastPoint = ReadPoint(cmd, _allowComma);
_context.ArcTo(
_lastPoint.AsPointShape(),
PathSize.Create(w, h),
rotation,
large,
sweep ? SweepDirection.Clockwise : SweepDirection.Counterclockwise,
_isStroked,
!_isSmoothJoin);
}while (IsNumber(_allowComma));
last_cmd = 'A';
break;
case 'z':
case 'Z':
EnsureFigure();
_context.SetClosedState(_isClosed);
_figureStarted = false;
last_cmd = 'Z';
_lastPoint = _lastStart;
break;
default:
InvalidToken();
break;
}
}
}
