restore method

void restore([ PdfGraphicsState? state ])

Restores the state of this Graphics to the state represented by a GraphicsState.

//Creates a new PDF document.
PdfDocument doc = PdfDocument();
//Create PDF graphics for the page
PdfGraphics graphics = doc.pages.add().graphics;
//Save the graphics.
PdfGraphicsState state = graphics.save();
//Set graphics translate transform.
graphics
  ..translateTransform(100, 100)
  ..drawString('Hello world!', PdfStandardFont(PdfFontFamily.helvetica, 12),
      brush: PdfBrushes.red)
  //Restore the graphics.
  ..restore(state);
//Saves the document.
List<int> bytes = doc.save();
//Dispose the document.
doc.dispose();

Implementation

void restore([PdfGraphicsState? state]) {
  if (state == null) {
    if (_graphicsState.isNotEmpty) {
      _doRestoreState();
    }
  } else {
    if (state._graphics != this) {
      throw ArgumentError.value(
          this, 'The graphics state belongs to another graphics object');
    }
    if (_graphicsState.contains(state)) {
      while (true) {
        if (_graphicsState.isEmpty) {
          break;
        }
        final PdfGraphicsState popState = _doRestoreState();
        if (popState == state) {
          break;
        }
      }
    }
  }
}