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Lua Q&A

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LD_Chimpman:


--- Quote from: Jonius7 on March 26, 2014, 06:30:57 pm ---I'm not so sure about mirroring images within the Lua code itself, but if you have the original image (.gif, .png etc) you could mirror it and convert it to image code.

--- End quote ---

I'm hoping that I won't have to do that. I have quite a few images because they are for animations, and duplicating every one of those images to have a mirrored version of it would almost double the current file size. I know it has to be possible to do it locally since nspaint can modify and output image code, I'm just not quite sure how.

Jim Bauwens:
Take a look at http://wiki.inspired-lua.org/TI.Image. At the moment I don't have time to write a routine, but if you spend some time reading how the format works you should be able to do it. :)


Edit:
Whatever:

--- Code: ---
function mirror_img(imgstr, width , height)
    local out = imgstr:sub(1, 20)
    local p = 21
    for y=1, height do
        local row = ""
        for x=1, width do
        row =  imgstr:sub(p, p +1) .. row
        p = p + 2
    end
    out = out .. row
  end


  return out
end


img_hi_src = "\32\0\0\0\32\0\0\0\0\0\0\0\64\0\0\0\16\0\1\000alalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalal\194\253alalalalalalalalalalalalalalalalalalalalalalalalalalalalalalal\194\253alalalalalalalalal\194\253alalalalal\194\253alalalalal\194\253\194\253alalalalalalal\194\253\194\253alalalalalalalalal\194\253alalalalal\194\253alalalalal\194\253\194\253alalalalalalal\194\253\194\253alalalalalalalalal\194\253alalalalal\194\253alalalal\194\253\194\253alalalalalalalal\194\253\194\253alalalalalalalal\194\253\194\253alalalalal\194\253alalalalalalalalalalalalalal\194\253\194\253alalalalalalalal\194\253\194\253alalalalal\194\253alalalalalalalalalalalalalal\194\253\194\253alalalalalalalal\194\253\194\253alalalalal\194\253alalalalalalalalalalalalalal\194\253\194\253alalalalalalalal\194\253\194\253alalalalal\194\253alalalalalalalalalalalalalal\194\253\194\253alalalalalalalal\194\253\194\253alalalalal\194\253alalalalalal\194\253alalalalalalal\194\253alalalalalalalalal\194\253\194\253alalalalal\194\253alalalalalal\194\253alalalalalalal\194\253alalalalalalalalalal\194\253\194\253\194\253\194\253\194\253\194\253\194\253alalalalalal\194\253alalalalalalal\194\253alalalalalalalal\194\253\194\253\194\253\194\253\194\253\194\253alal\194\253alalalalalal\194\253alalalalalalal\194\253alalalalalalalal\194\253\194\253\194\253alal\194\253\194\253\194\253\194\253alalalalalal\194\253alalalalalalal\194\253alalalalalalalalal\194\253\194\253alalalalal\194\253alalalalalal\194\253alalalalalalal\194\253alalalalalalalalal\194\253\194\253alalalalal\194\253alalalalalalalalalalalalalal\194\253alalalalalalalalal\194\253\194\253alalalalal\194\253alalalalalal\194\253alalalalalalal\194\253alalalalalalalalal\194\253a\144alalalalal\194\253alalalalalal\194\253alalalalalalalalalalalalalalalalal\194\253\194\253alalalalal\194\253alalalalalal\194\253alalalalalalalalal\194\253alalalalalalal\194\253\194\253alalalalal\194\253alalalalalal\194\253alalalalalalalal\194\253\194\253alalalalalalal\194\253\194\253alalalalal\194\253alalalalalal\194\253alalalalalalal\194\253\194\253\194\253alalalalalalal\194\253\194\253alalalalal\194\253alalalalalal\194\253alalalalalalal\194\253\194\253alalalalalalalalal\194\253alalalalalalalalalalalalalalalalalalalal\194\253alalalalalalalalalal\194\253alalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalalal"


img_hi = image.new(img_hi_src)
img_hi_reverted=image.new(mirror_img(img_hi_src, 32, 32))


function on.paint(gc)
    gc:drawImage(img_hi, 10, 10)
    gc:drawImage(img_hi_reverted, 10, 100)
end

--- End code ---

LD_Chimpman:
Thanks so much!

I actually had spent some time studying the lua image string format by loading in a 2x2 pattern as well as a mirrored copy of the image and I found what parts of it
I needed to move around, my problem was the implementation of it. I was trying to split the image string into table values, separated by each "\". Then I was going
to move around the table values and concatenate the table for the final mirrored image. However since forward slashes act as some kind of weird special character
in lua, it overall just didn't work. I guess I was over complicating it.


Thanks again, now I can continue to make progress on my project!


For your help, here's a teaser of my project which so far is turning out really awesome if I do say so myself!  ;D

AnToX98:
Guys please Help me !


I can't find how to modify a segment shape position :(


It is actually possible ?


To get the segment coordinates : mysegment:a()/mysegment:b(), but I can't modify them :(

AnToX98:
Please could someone help me :( ?

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