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Resizing images

 
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JoshDB



Joined: 05 Oct 2005
Posts: 87
PostPosted: Fri Nov 11, 2005 11:09 am    Post subject: Resizing images Reply with quote
Hey all. So far I've displayed and centered images in my image viewer using this -

Code:
function ImageViewer(loc)
   tempimage = Image.load(loc)
   if tempimage:width() > 480 and tempimage:height() < 258 then
      minusc = tempimage:width() - 480
   elseif tempimage:height() > 272 and tempimage:width() < 481 then
      minusc = tempimage:height() - 258
   elseif tempimage:width() > 480 and tempimage:height() > 258 then
      if tempimage:width() > tempimage:height() then
         minusc = tempimage:width() - 480
      else
         minusc = tempimage:height() - 258
      end
   end
   if minusc == nil then
      tempcentx = tempimage:width()/2
      tempcenty = tempimage:height()/2
   else
      tempcentx = tempimage:width() - minusc
      tempcenty = tempimage:height() - minusc
      tempcentx = tempcentx/2
      tempcenty = tempcenty/2
   end
   centerx = 480/2 - tempcentx
      
   centery = 258/2 - tempcenty
   minusc = 0
   while true do
      screen:clear()
      screen:blit(0,0,white)
      screen:blit(centerx,centery,tempimage,0,0,tempimage:width() - minusc,tempimage:height() - minusc)
      screen:blit(0,0,ivt)
      button = Controls.read()
      if button:cross() then
         screen.waitVblankStart(10)
         break
         screen.waitVblankStart(1)
      end
      screen.flip()
   end
   screen.flip()
end


I thought screen:blit(centerx,centery,tempimage,0,0,tempimage:width() - minusc,tempimage:height() - minusc) would also resize the image, but no. It just displays certain portions of the image, and the rest is cut off.

Is there some way to do this?
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Durante



Joined: 02 Oct 2005
Posts: 65
Location: Austria
PostPosted: Fri Nov 11, 2005 11:12 am    Post subject: Reply with quote
Sure, use screen.blitScaled() in my version :P

But seriously, there's no scaling in standard LuaPlayer as of now that I know of. It would also be really slow if you do it in software.
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JoshDB



Joined: 05 Oct 2005
Posts: 87
PostPosted: Fri Nov 11, 2005 11:13 am    Post subject: Reply with quote
I found something kinda helped me.

Code:
function Image:magnify(mag)
  mag = mag or 2           -- 2 times in size by default
  local w = self:width() 
  local h = self:height()
  local result = Image.createEmpty(mag*w, mag*h)
  for x = 0, w-1 do
    for y = 0, h-1 do
      result:fillRect(mag*x, mag*y, mag,mag, self:pixel(x,y))
    end
  end
  return result
end


But it resize by a fraction, and I haven't tested to see if it works for small fractions like 0.5.

Thanks in advance for any help.
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KawaGeo



Joined: 27 Aug 2005
Posts: 191
Location: Calif Mountains
PostPosted: Fri Nov 11, 2005 2:14 pm    Post subject: Reply with quote
I modified the code you posted above. It does not do some fraction. Only double, triple, etc. of a given image. Sorry.

Perhaps, the new version 0.12 would do the trick. I haven't taken a look into it, yet.
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