setScaleFactor method
Sets the zoom factor to allow for adjusting line width.
If the factor is 2 for example, lines will be drawn half as thick as actually selected to allow for drawing details. Has to be greater than 0.
Implementation
void setScaleFactor(double factor) {
assert(factor > 0, "The scale factor must be greater than 0.");
temporaryValue = value.copyWith(
scaleFactor: factor,
);
}