Counter Undo and Redo

How Counter Undo and Redo Works?

The Counter Undo and Redo tool works by stepping the Current Position back or forward with single keys. Press ↓ to undo a stitch tap and ↑ or Space to redo it; ← and → do the same for the Undo Stack display.

1. 1

   Undo a double tap

   Press ↓ once to remove the extra count.

2. 2

   Redo a removed count

   Press ↑ or Space to add it back.

3. 3

   Undo a row

   Press ← to step the second display back by 1.

4. 4

   Check the step size

   Undo removes 1 step at the current Count Step Size, so Step by 4 undoes 4.

Counter Undo and Redo Formula

The Counter Undo and Redo formula is count after undo = count − step size, and the count never goes below 0.

Undo

C' = max(0, C − s)

C is Current Position and s is the step size.

Redo

C' = C + s

Redo adds 1 step.

Net after a run

C' = C + s × (redos − undos)

Net shows the effect of several presses.

Worked example: At a count of 48 with Step by 4, one undo gives 48 − 4 = 44, and one redo returns to 48.

Counter Undo and Redo Conversion Table

The Counter Undo and Redo conversion table shows the count after undos at 4 step sizes, from a count of 60.

Counts stop at 0.

What is Counter Undo and Redo?

Counter Undo and Redo is a tool that reverses or repeats counting actions with one key. Double taps and missed taps happen when the hands are busy.

Single-key fixes keep the count right without a menu. The Stitches Counter tool saves the corrected count in your browser after each press.

What are the uses of Counter Undo and Redo?

There are 4 main uses of Counter Undo and Redo, including double taps, wrong step sizes and row fixes.

• Double taps

  Remove an extra count.

• Missed taps

  Add a forgotten count.

• Row fixes

  Step the row back by 1.

• Group fixes

  Undo a full group at a larger step.