/// <summary>
/// Parse a PathFigureCollection string
/// </summary>
internal void ParseToGeometryContext(
StreamGeometryContext context,
string pathString,
int startIndex)
{
// [BreakingChange] Dev10 Bug #453199
// We really should throw an ArgumentNullException here for context and pathString.
// From original code
// This is only used in call to Double.Parse
_formatProvider = System.Globalization.CultureInfo.InvariantCulture;
_context = context;
_pathString = pathString;
_pathLength = pathString.Length;
_curIndex = startIndex;
_secondLastPoint = new Point(0, 0);
_lastPoint = new Point(0, 0);
_lastStart = new Point(0, 0);
_figureStarted = false;
bool first = true;
char last_cmd = ' ';
while (ReadToken()) // Empty path is allowed in XAML
{
char cmd = _token;
if (first)
{
if ((cmd != 'M') && (cmd != 'm')) // Path starts with M|m
{
ThrowBadToken();
}
first = false;
}
switch (cmd)
{
case 'm': case 'M':
// XAML allows multiple points after M/m
_lastPoint = ReadPoint(cmd, ! AllowComma);
context.BeginFigure(_lastPoint, IsFilled, ! IsClosed);
_figureStarted = true;
_lastStart = _lastPoint;
last_cmd = 'M';
while (IsNumber(AllowComma))
{
_lastPoint = ReadPoint(cmd, ! AllowComma);
context.LineTo(_lastPoint, 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.X += ReadNumber(! AllowComma); break;
case 'H': _lastPoint.X = ReadNumber(! AllowComma); break;
case 'v': _lastPoint.Y += ReadNumber(! AllowComma); break;
case 'V': _lastPoint.Y = ReadNumber(! AllowComma); break;
}
context.LineTo(_lastPoint, IsStroked, ! IsSmoothJoin);
}
while (IsNumber(AllowComma));
last_cmd = 'L';
break;
case 'c': case 'C': // cubic Bezier
case 's': case 'S': // smooth cublic Bezier
EnsureFigure();
do
{
Point 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.BezierTo(p, _secondLastPoint, _lastPoint, IsStroked, ! IsSmoothJoin);
last_cmd = 'C';
}
while (IsNumber(AllowComma));
break;
case 'q': case 'Q': // quadratic Bezier
case 't': case 'T': // smooth quadratic Bezier
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, _lastPoint, IsStroked, ! IsSmoothJoin);
last_cmd = 'Q';
}
while (IsNumber(AllowComma));
break;
case 'a': case 'A':
EnsureFigure();
do
{
// A 3,4 5, 0, 0, 6,7
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,
new Size(w, h),
rotation,
large,
#if PBTCOMPILER
sweep,
#else
sweep ? SweepDirection.Clockwise : SweepDirection.Counterclockwise,
#endif
IsStroked,
! IsSmoothJoin
);
}
while (IsNumber(AllowComma));
last_cmd = 'A';
break;
case 'z':
case 'Z':
EnsureFigure();
context.SetClosedState(IsClosed);
_figureStarted = false;
last_cmd = 'Z';
_lastPoint = _lastStart; // Set reference point to be first point of current figure
break;
default:
ThrowBadToken();
break;
}
}
}