quad method
Implementation
void quad(Offset p1, Offset p2, Offset p3, Offset p4) {
final path = Path()
..moveTo(p1.dx, p1.dy)
..lineTo(p2.dx, p2.dy)
..lineTo(p3.dx, p3.dy)
..lineTo(p4.dx, p4.dy)
..close();
_paintingContext.canvas //
..drawPath(path, _paintingContext.fillPaint) //
..drawPath(path, _paintingContext.strokePaint);
_paintingContext.markHasUnappliedCanvasCommands();
}