[solved] Sprites don't parent

jack0088

Somehow I just don't get it...
I have three Sprites: Group, sprite1, sprite2
Group is en empty Sprite. The two others are Lines. Then I parent them:

Group:addChild( sprite1 ) Group:addChild( sprite2 ) stage:addChild( Group )

Look at the output of stage! The parenting doesn't work! Every sprite points to itself as parent and child. Should't sprite1 and sprite2 point to Group as a __parent?

stage = { | __userdata = "userdata: 0x10610fd28" | __children = { | | userdata: 0x104e8c330 = { | | | id = "Group" | | | __parent = {} -- stage (self reference) | | | __userdata = "userdata: 0x10611d1c8" | | | __children = { | | | | userdata: 0x104e89310 = { | | | | | id = "sprite1" | | | | | __parent = {} -- stage.__children.userdata: 0x104e8c330 (self reference) | | | | | __children = { | | | | | | userdata: 0x104e804e0 = { | | | | | | | __userdata = "userdata: 0x10611d238" | | | | | | | __parent = {} -- stage.__children.userdata: 0x104e8c330.__children.userdata: 0x104e89310 (self reference) | | | | | | } | | | | | } | | | | | __userdata = "userdata: 0x10611f8b8" | | | | } | | | | userdata: 0x104e80770 = { | | | | | id = "sprite2" | | | | | __parent = {} -- stage.__children.userdata: 0x104e8c330 (self reference) | | | | | __children = { | | | | | | userdata: 0x104e7bb90 = { | | | | | | | __userdata = "userdata: 0x10611b008" | | | | | | | __parent = {} -- stage.__children.userdata: 0x104e8c330.__children.userdata: 0x104e80770 (self reference) | | | | | | } | | | | | } | | | | | __userdata = "userdata: 0x106124178" | | | | } | | | } | | } | } }

MikeHart

For me, parenting works. With that little piece of code it is hard to tell what is wrong with your code.

jack0088

can you try mine, please?

MikeHart

I don't know what you do with all this printing, but if parenting would not work, you would not see the two lines on the canvas. So I guess it is your algorythm to analyse this data structure.

MikeHart

I am not sure if sprites are simple Lua tables like you expect them to be.

ndoss

If I use "inspect.lua" to print "stage", I get a structure like the following (I've added comments) which has the parenting like you'd expect:

<1>{ __children = <2>{ [<userdata 1>] = <img class="emoji" src="https://forum.giderosmobile.com/resources/emoji/heart.png" title="<3" alt="<3" height="20" />>{ __children = <4>{ [<userdata 2>] = <5>{ __parent = <table 3>, __userdata = <userdata 5>, id = "sprite1", -- "sprite2" parent is table 3 (i.e., "Group")   __parent = <table 3>, __userdata = <userdata 9>, id = "sprite2", -- "sprite2" parent is table 3 (i.e., "Group") } }, __parent = <table 1>, __userdata = <userdata 10>, id = "Group", -- "Group" parent is table 1 (which is the top level table, i.e., the stage) } }, }

I think your print_r routine is misleading you a bit. If I use "setPosition" on Group, both sprite1 and sprite2 move. If I use "setPosition" on sprite1, just sprite1 moves. This is the behavior I'd expect if the parenting was working correctly.

--ND

jack0088

really? ohh.. didn't thought my print_r would produce wrong results.
How did you use the inspect.lua to get this clean output? When I was using it, it gave me the metatables and other things also, so the output was confusing and unreadable due to a lot of data.

ndoss

It also gives me confusing and difficult to read output . In the example above, I manually removed the extra junk.

Also, I don't think you're print routine is giving you wrong results...just difficult to interpret results.

jack0088

I'll keep on trying to locate my problems.. Thank you all again, very appreciate this community and the help!