Undo function

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Undo function

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Topic: Undo function (Read 842 times)

beaujob
Full Member

Posts: 66

Undo function

« on: October 27, 2001, 06:40:29 PM »

Since CL's got a way to store the last step, then all they need to do is make a dropout stack of that data structure. It's very easy. Just have a static array, and pretend it's a ring, then keep a pointer to the most recent step. As you undo/redo, you can move the pointer backwards and forwards. You also keep a pointer to the tail so you know when you've gotten to the bottom of possible undoing. This is something they teach every sophomore CS student. (like me last year.) :P


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Phonyboy
Newbie

Posts: 4

Undo function

« Reply #1 on: October 16, 2001, 03:46:07 PM »

I could need an Undo button.... really! You too?


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baggio
Sr. Member

Posts: 101

Undo function

« Reply #2 on: October 27, 2001, 10:36:28 PM »

Quote: from beaujob on 7:40 pm on Oct. 27, 2001
... Just have a static array, and pretend it's a ring, then keep a pointer to the most recent step. As you undo/redo, you can move the pointer backwards and forwards....

Sounds a lot like a circular queue ;)This is something they teach every sophomore CS student. (like me last year.) :P

They also keep teaching it to 5th year EET seniors like me. Not so much that they keep reteaching it, but we keep using it in our projects.


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beaujob: I wouldn't mind doing kung-fu in the shadow of a bridge that I built while death and a clown get it on in the bathtub next door, but that's a long ways off.

Micha
Jr. Member

Posts: 12

Undo function

« Reply #3 on: October 28, 2001, 07:47:31 AM »

yeah, great idea, would love to see it implemented


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Guest

Undo function

« Reply #4 on: October 16, 2001, 04:04:21 PM »

There is one, I've used it many times. Over on the right, above 'Clear'.

:-)

(Edited by Chillum at 3:16 pm on Oct. 16, 2001)


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Andy24
Full Member

Posts: 84

Undo function

« Reply #5 on: October 28, 2001, 10:30:05 AM »

I hate it when I need to keep changing forward and backwards to delete things. it would be nice if I could just use the undo.


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Phonyboy
Newbie

Posts: 4

Undo function

« Reply #6 on: October 16, 2001, 04:07:22 PM »

drats... I guess I shouldn´t have started to post here before actually checking out the full version which I downloaded some minutes ago ;-)


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Entroper
Jr. Member

Posts: 33

Undo function

« Reply #7 on: October 28, 2001, 12:15:54 PM »

It's not really a queue, since the order you take things out is like a stack. It's basically a stack that overwrites the bottom elements after a certain number of elements are in it. ':)'

I think it would be pretty cool to have multiple undo layers.


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Entroper
Programmer, Serious Fortress Team
http://www.seriousfortress.com

pasqualz
Full Member

Posts: 72

Undo function

« Reply #8 on: October 17, 2001, 12:39:34 PM »

Hey no problem, we all have had one time when the answer is staring us in the face and we don't see it ;-)


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beaujob
Full Member

Posts: 66

Undo function

« Reply #9 on: October 25, 2001, 01:22:49 PM »

Though, it's good that he mentions the Undo button. I would like to see a deeper undo stack. Perhaps keep track of the last 10-20 operations? Sometimes you make two mistakes in a row before you realize that the first mistake even happened.


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"And once again, the day is saved thanks to the Powerpuff Girls."

pulsejet5
Jr. Member

Posts: 42

Undo function

« Reply #10 on: October 27, 2001, 05:28:18 PM »

multiple undo buttons is a great idea but it would also be useful to have a redo button


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Guest

Undo function

« Reply #11 on: October 27, 2001, 06:30:32 PM »

Both would definately help, and should be easy enough to implement I would've thought.


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