Z-axis or stage drawing order

kroll

I don’t understand how Gideros works with z-axis (or drawing order). How can I define drawing order of sprites when they cover each other?

Think of this: in the stage there are one background image and several foreground images which may partially cover each other. Now I want to add another image to the stage between background and at least one foreground image. In 3d it could be done by using z – axis. How to do it in Gideros?

ar2rsawseen

Basically the order you added an object is its Z index. New objects are on top of all other objects, etc.
You can control z-index of specific object by adding it using addChildAt(index) method

Here's an example of functions you can use to control object's z-index:

function Sprite:bringToFront() self:getParent():addChild(self) end   function Sprite:sendToBack() self:getParent():addChildAt(self, 0) end   function Sprite:setIndex(index) local parent=self:getParent() if index<parent:getChildIndex(self) then index=index-1 end parent:addChildAt(self, index) end

Added this to FAQ:
http://www.giderosmobile.com/DevCenter/index.php/Forum_FAQ#How_can_I_control_Z-index_of_object.3F

GGGRRR123

What child will be "on front" with index 1 of 2 ?

moopf

2 would be in front, 1 behind

GGGRRR123

thanks!

speeder_kidoteca

can I put a arbitrary Z?

Also, why the API does not have toBack and toFront by default?

ar2rsawseen

1) Arbitrary no, it could only be between 1 and child count of same parent.
2) most probably Sprite:addChildAt(sprite, index) seemed more appropriate when dealing with hierarchy trees.