addTickMarks method
void
addTickMarks()
Implementation
void addTickMarks() {
tickMarks = [for (var x in getTickNumbers()) getTick(x, size: tickSize)];
bigTickMarks = [
for (var x in numbersWithElongatedTicks)
getTick(x, size: tickSize * longTickMultiple)
];
add([...tickMarks!, ...bigTickMarks!]);
}