line method
Implementation
void line(Offset p1, Offset p2, [Offset? p3]) {
if (p3 != null) {
throw UnimplementedError('3D line drawing is not yet supported.');
}
_paintingContext.canvas.drawLine(p1, p2, _paintingContext.strokePaint);
_paintingContext.markHasUnappliedCanvasCommands();
}