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[Lua Functions] Image Rotate & Image Scale

 
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arrggg



Joined: 29 Sep 2005
Posts: 11
PostPosted: Fri Oct 07, 2005 5:25 am    Post subject: [Lua Functions] Image Rotate & Image Scale Reply with quote
Here's some functions I came up with; I hope someone finds them useful.

Code:

function rotateImage(theImage)
   newImage = Image.createEmpty(theImage:height(), theImage:width())
   for x = 1, theImage:width() do
      for y = 1, theImage:height() do
         newImage:blit(y, x, theImage, x, y, 1, 1)
      end
   end
   return newImage
end -- rotateImage

function scaleImage(newX, newY, theImage)
   newImage = Image.createEmpty(newX, newY)
   for x = 1, newX do
      for y = 1, newY do
         newImage:blit(x,y , theImage, math.floor(x*(theImage:width()/newX)),math.floor(y*(theI  mage:height()/newY)), 1, 1)
      end
   end
   return newImage
end --scaleImage

--main program
smile = Image.load("smiley.png")
screen:blit(0, 0, smile)
screen:blit(100, 0, rotateImage(smile))
screen:blit(0,100, scaleImage(100,150, smile))
screen:flip()
screen.waitVblankStart(600)
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Zenurb



Joined: 30 Sep 2005
Posts: 106
Location: United Kingdom
PostPosted: Fri Oct 07, 2005 8:52 am    Post subject: Reply with quote
Probably get very slow with big images.
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arrggg



Joined: 29 Sep 2005
Posts: 11
PostPosted: Fri Oct 07, 2005 9:12 am    Post subject: Reply with quote
it's not that bad really.
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