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saving png as different file name if it exists

 
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raptrex



Joined: 29 Sep 2005
Posts: 9
PostPosted: Fri Sep 30, 2005 10:41 am    Post subject: saving png as different file name if it exists Reply with quote
for the base of my "paint" application, im using this script from the tutorial:

Code:
red = Color.new(255, 0, 0);
black = Color.new(0, 0, 0);
white = Color.new(255, 255, 255);

canvas = Image.createEmpty(480, 272)
canvas:clear(white)

brush = {}
eraser = {}

x0 = 0
y0 = 0
x1 = 0
y1 = 0
while true do
   pad = Controls.read()
   dx = pad:analogX()
   if math.abs(dx) > 32 then
      x0 = x0 + dx / 64
   end
   dy = pad:analogY()
   if math.abs(dy) > 32 then
      y0 = y0 + dy / 64
   end
   if pad:cross() then
      canvas:drawLine(x0, y0, x1, y1, black)
   end
   x1 = x0
   y1 = y0
   screen:blit(0, 0, canvas, 0, 0, canvas:width(), canvas:height(), false)
   screen:drawLine(x1 - 5, y1, x1 + 5, y1, red)
   screen:drawLine(x1, y1 - 5, x1, y1 + 5, red)
   screen.waitVblankStart()
   screen.flip()
   if pad:start() then break end
   if pad:select() then screen:save("screenshot.png") end
end


with the use of png instead of tga

how would i do this?:

if screenshot.png exists, save image as screenshot1.png
if screenshot1.png exists, save image as screenshot2.png
ect ect ect

maybe to infinity and beyond
or 10 for now
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LuMo



Joined: 21 Aug 2005
Posts: 410
Location: Austria
PostPosted: Fri Sep 30, 2005 6:33 pm    Post subject: Reply with quote
Code:

function ScreenShot()
    name='screenshot_'
    counter=0
    extension='.png'
    while io.open(name..counter..extension, "r") do
        counter=counter+1
        io.close()
    end
    --reached a filename that does not exist.
    screen:save(name..counter..extension)
end

this code is untested, but i guess it should work.
plz post if it really works and if not, what happens (or report the fix)

greets
lumo
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"Good artists copy, great artists steal."
Pablo Picasso
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raptrex



Joined: 29 Sep 2005
Posts: 9
PostPosted: Fri Sep 30, 2005 10:00 pm    Post subject: Reply with quote
it works perfectly THANK YOU!!!!
your my hero
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LuMo



Joined: 21 Aug 2005
Posts: 410
Location: Austria
PostPosted: Fri Sep 30, 2005 10:07 pm    Post subject: Reply with quote
fine!
uploaded the lua-file to my webpage :)

greets
_________________
"Good artists copy, great artists steal."
Pablo Picasso
go2lumo.com
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paulieweb



Joined: 03 Nov 2005
Posts: 8
Location: PSU
PostPosted: Thu Nov 03, 2005 12:31 pm    Post subject: Reply with quote
i tried both raptrex's original screenshot code from the tutorial and lumo's screenshot function, and neither saves a screenshot anywhere on my stick. when i hit the button, the memory stick light flashes like it's saving, but i can't find it. anybody else with this problem?
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chaos



Joined: 10 Apr 2005
Posts: 135
PostPosted: Thu Nov 03, 2005 1:09 pm    Post subject: Reply with quote
paulieweb wrote:
i tried both raptrex's original screenshot code from the tutorial and lumo's screenshot function, and neither saves a screenshot anywhere on my stick. when i hit the button, the memory stick light flashes like it's saving, but i can't find it. anybody else with this problem?


yeah.. don't use usb mode when taking screenshots, they won't show up.. and you can end up corrupting the memory stick, requiring a reformat.
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paulieweb



Joined: 03 Nov 2005
Posts: 8
Location: PSU
PostPosted: Thu Nov 03, 2005 2:18 pm    Post subject: Reply with quote
whew, thanks a lot
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Master Inuyasha



Joined: 13 Nov 2005
Posts: 13
PostPosted: Sun Nov 13, 2005 3:18 pm    Post subject: Reply with quote
hey, something is wrong, i installed that into my script, and made it so that when you press pad, it takes a screenshot, but it doesnt work. Heres my code:

elseif pad:select() then
function ScreenShot()
name='ms0:/PSP/PHOTO/screenshot_'
counter=0
extension='.png'
while io.open(name..counter..extension, "r") do
counter=counter+1
io.close()
end
--reached a filename that does not exist.
screen:save(name..counter..extension)
end
end

says got nil calling global value
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