Is there something wrong with application:getDeviceHeight()

Comments

• ar2rsawseen Maintainer

  October 2015

  For some reason here it displays two resolutions for iphone 6, one of them is like iphone 5
  
  http://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions

  http://appcodingeasy.com/Gideros-Mobile

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• totebo Member

  October 2015

  I think it's to do with up/down sampling based on pixel density. It's confusing. Someone should make a list of real, actual pixels only.
  
  What are you trying to do?

  My Gideros games: www.totebo.com

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• Tom2012 Guru

  October 2015 edited October 2015

  Hmm thats so odd!
  
  @ar2rawseen - Thanks for that url, although I've no idea why there's two resolutions. There's only one version of the iphone 6 (not counting the plus version). Anyway, going by that chart, the resolution being reported in Gideros is correct. The iphone 6 is upsampling it.
  
  @Totebo - I have a system in my game that checks if a sprite is outside of the screen. If it is, it sets the sprite to setVisible(false). And vice versa. It makes for a hefty performance increase. It does rely on being able to get the screen point size / x1 size / resolution accurately though.
  
  Thanks!

  Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns

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• totebo Member

  October 2015

  @Tom2012, I actually coded a system for this to be used with a Box2D world the other day. I have a "Camera" that locks onto the player and a method to get the boundaries based on the actual screen dimensions. Your requirements may be different, but this is the code in case it could be useful to you:

  function Camera:getBoundaries()   local x1 = self.sprite_player:getX() - (application:getLogicalWidth()/2)/self.sprite_gameworld:getScale() local y1 = self.sprite_player:getY() - (application:getLogicalHeight()/2)/self.sprite_gameworld:getScale() local x2 = self.sprite_player:getX() + (application:getLogicalWidth()/2)/self.sprite_gameworld:getScale() local y2 = self.sprite_player:getY() + (application:getLogicalHeight()/2)/self.sprite_gameworld:getScale()   return x1, y1, x2, y2   end

  I tested it on the XCode emulators, and it seems to work fine on iPhone 6.
  
  Niclas
  
  
  

  My Gideros games: www.totebo.com

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• Tom2012 Guru

  October 2015

  @Totebo
  
  Awesome, thanks. Looks very efficient. I'll look into how it works.
  
  I've tracked down my problem and it's even more weird...
  
  On iphone 4, the game works fine.
  
  On iphone 6 and 6 plus there's a problem...

  function SpritesOffScreen:setup()   local t = Timer.new(450,math.huge) t:addEventListener(Event.TIMER, self.cullOffScreenSprites, self) t:start() self.t = t   end     function SpritesOffScreen:cullOffScreenSprites()...

  The problem is the timer doesnt run on iphone 6 (device). I'll look into it and figure out what's up.

  Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns

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• Tom2012 Guru

  October 2015

  Hmm the problem is math.huge
  
  If I use math.huge on iphone 6 / 6 plus it does not work.
  
  If I use an int instead, like 99999, then there's no problems!

  Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns

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• totebo Member

  October 2015

  That is strange.
  
  I tend to have a game loop based on ENTER_FRAME that other classes subscribe to, so I can pause the game easily, and turn classes updating on or off to see how much CPU they use. So I've never bumped into this issue before.
  
  

  My Gideros games: www.totebo.com

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