[SNIPPET] Pixels to scale factor

[Eamonn]

I wrote a little snippet for converting from LÖVE's scale factor to a pixel size of your choice. Of course, you don't have to keep any particular aspect ratio, but I would recommend you do usually. Although in some cases you might need to set an enforced pixel size. Here is the snippet:

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function pixToScale( destSize, currSize )
    return destSize / currSize
end

You put the size you want as destSize, and the image/whatever's current size as currSize.

I hope you find this useful! I couldn't see this on the snippets part of the wiki. This is something I didn't find obvious, and had to search for a couple of days to find the answer. Just thought I'd share and help anyone else in need of this sort of thing!

Have a great day!

[Ranguna259]

That's completly right, I uses this method to resize images. And I'm probably gonna use it to resize the screen to make my games support multiple screen resolutions.

[MadByte]

Therefor I also got some snippets.

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function setResolution(w, h)
  WIDTH, HEIGHT = w, h
  SCREENWIDTH, SCREENHEIGHT = love.window.getDimensions()
  SCALEX, SCALEY = SCREENWIDTH / WIDTH, SCREENHEIGHT / HEIGHT
end


function setScale(w, h)
  SCREENWIDTH, SCREENHEIGHT = w, h
  SCALEX, SCALEY = SCREENWIDTH / WIDTH, SCREENHEIGHT / HEIGHT
  love.window.setMode(SCREENWIDTH, SCREENHEIGHT)
end

And in love.draw:

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love.graphics.scale(SCALEX, SCALEY)
-- draw stuff

Works great for my projects, but might need to be edited to suit your needs.

[Eamonn]

Therefor I also got some snippets.

Code: Select all

function setResolution(w, h)
  WIDTH, HEIGHT = w, h
  SCREENWIDTH, SCREENHEIGHT = love.window.getDimensions()
  SCALEX, SCALEY = SCREENWIDTH / WIDTH, SCREENHEIGHT / HEIGHT
end


function setScale(w, h)
  SCREENWIDTH, SCREENHEIGHT = w, h
  SCALEX, SCALEY = SCREENWIDTH / WIDTH, SCREENHEIGHT / HEIGHT
  love.window.setMode(SCREENWIDTH, SCREENHEIGHT)
end

And in love.draw:

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love.graphics.scale(SCALEX, SCALEY)
-- draw stuff

Works great for my projects, but might need to be edited to suit your needs.

Excellent snippets! Thanks for sharing

I'm interested in one-liner things now, ever since I found out about Python's Lambda functionality, so here's how you'd put my method on 1 line:

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pixToMet = function(destSize, currSize) return destSize / currSize end

-- Just call and pass arguments to the function as normal
pixToMet(dS, cS)

I believe they are called "local functions", are do you still refer to them as lambda's in Lua?

[Tanner]

I believe they are called "local functions", are do you still refer to them as lambda's in Lua?

'Lambda' just denotes an anonymous function or closure. You can totally call any Lua function a lambda.