Undo Button

Akhwa

Hello Guys,
I want to create undo button for a Coloring Book App (Select2fill) so i can go 1 step back,but cant figure out how to
i am using a Select color to fill technique for my coloring using game.integer(color.game)

Thanks in advance

tatiang

How are you doing the "select color to fill technique"? And what is it that you want to undo... just the color selection or the actual fill (pixels changing color)?

Akhwa

i created a global game integer called game.color
and i've added a color button with:
when touch is pressed change attribute game.color=1
for each color button with a different number each
and for the sketches each part has a group of rules which is
when touch is pressed if game color=1(as an example)
change attribute self color red to 1
change attribute self color green to 0
change attribute self color blue to 0
for all the palette colors iam going to add
for the undo i want it to go step back each click
so if i do lets say 5 steps
1-change color to red
2-change color to blue in another part of sketch
3-change color to green
i want when i press the undo button it goes back to step 3 state,then 2 and so on

Thanks for your time

tatiang

Okay, then just record each color change in a table with each column representing a color value (red, green, or blue):

1 1 1
1 0 0
1 0 1
1 1 1
0 1 1
etc.

If you press the undo button, you just change the current color to the values in the row above the last row (tableRowCount(tableName)-1) and then delete the last row as long as there are at least two rows.

Akhwa

Okay thanks tatiang i'll try this method
appreciate the help

Akhwa

@tatiang said:
Okay, then just record each color change in a table with each column representing a color value (red, green, or blue):

1 1 1
1 0 0
1 0 1
1 1 1
0 1 1
etc.

If you press the undo button, you just change the current color to the values in the row above the last row (tableRowCount(tableName)-1) and then delete the last row as long as there are at least two rows.

can you break it down more onto detail as i cant keep up with what you said
Sorry

tatiang

For your color values, you might have integer attributes called game.red, game.blue, and game.green. The algorithm would be:

If [select new color]
     Add row to table
     Change table values to color values (e.g. col 1=1, col2=0, col3=1)
     Save table

If [undo]
     Change color values to table values from last row (tableRowCount(tableName)
     Delete table row [tableRowCount(tableName)]

Akhwa

i have a integer attribute called game.color which identifies the color number and with each color number i add change attribute to the color values
so simply how my selection button looks
if touch is pressed change game color to 1 (as an example)
for my coloring sketch each part carrys rules identifying each game color value
so as an example for the red
when touch is pressed if game color is 1
change attribute
self color red to 1
self color green to 0
self color blue to 0

so how i can hook up the game color value to tables and how the integer attributes u mentioned should work with this