public static ShxGlyph Process(string glyphName, IEnumerable <ShxGlyphCommand> commands, IReadOnlyDictionary <ushort, IEnumerable <ShxGlyphCommand> > characters)
{
var state = new ShxCommandProcessorState();
Process(state, commands, characters);
var glyph = state.CreateGlyph(glyphName);
return(glyph);
}
private static void Process(ShxCommandProcessorState state, IEnumerable <ShxGlyphCommand> commands, IReadOnlyDictionary <ushort, IEnumerable <ShxGlyphCommand> > characters)
{
foreach (var command in commands)
{
if (state.MoveNext())
{
switch (command)
{
case ShxGlyphCommandPenDown _:
state.SetDrawingState(true);
break;
case ShxGlyphCommandPenUp _:
state.SetDrawingState(false);
break;
case ShxGlyphCommandUpdateScaleVector sc:
state.ApplyVectorScale(sc.Scale);
break;
case ShxGlyphCommandPushPoint _:
state.PushPoint();
break;
case ShxGlyphCommandPopPoint _:
state.PopPoint();
break;
case ShxGlyphCommandReplayCharacter r:
if (characters.TryGetValue(r.Character, out var subCommands))
{
// TODO: handle offset/scale
Process(state, subCommands, characters);
}
break;
case ShxGlyphCommandMoveCursor m:
state.ProcessNewPosition(new ShxPoint(m.DeltaX, m.DeltaY));
break;
case ShxGlyphCommandOctantArc a:
state.ProcessArc(a);
break;
case ShxGlyphCommandFractionalArc a:
state.ProcessArc(a);
break;
case ShxGlyphCommandArc a:
state.ProcessArc(a);
break;
case ShxGlyphCommandSkipNextIfHorizontal _:
// always assuming horizontal mode
state.SkipNextCommand();
break;
default:
throw new NotSupportedException($"Unexpected glyph command '{command?.GetType().Name}'");
}
}
else if (command is ShxGlyphCommandMoveCursor move)
{
// heuristic: the vertical command skip usually preceeds a move that corresponds to the negative
// height and half the width of the character
state.SetSize(Math.Abs(move.DeltaX), Math.Abs(move.DeltaY));
}
}
}
