java - LibGDX - Does modifying a Group affects children? -

-

i wonder if there way affect actors children when parent group modified ? attached him. modifying mean doing conventional actions translation, rotation, scale ...

i know possible parent alpha affect children's alpha via draw() method, other attributes ?

for example if add translationaction group want affect children.

so did miss in scene2d api or have code own (not hard, want avoid if possible) ?

if it's not possible actual api purpose of using group ?

the answer question yes , no. because scene2d api designed around using spritebatch sets sorts of transformation information between parent , children actors.

if using spritebatch (i.e. drawing textures, , such it) yes actions applied parent affect children. there couple of exceptions actors if remember correctly think has things color, etc.

if not using spritebatch (i.e. drawing geometry directly opengl, or custom drawing actions (such meshes) outside of offered scene2d api) no actions not affect children. have write own code either subclassing scene2d or creating simple yourself. know isn't best thing ever 'libgdx tries not "end all, all" solution'.

the 'magic' how transforms work located in group (link source). group class uses method called drawchildren() iterate on children , draws them based on transformed spritebatch. transformation occurs in draw() method of group class.

this isn't real answer without example code, assume know how setup skins. end result of program below group button @ 50,100 , hello button @ 100,50. notice didn't make direct changes group button, put inside group , translated whole group instead.

public class groups implements applicationlistener {     private stage stage;     private skin uiskin;      @override public void create() {         this.stage = new stage(gdx.graphics.getwidth(), gdx.graphics.getheight(), false);         gdx.input.setinputprocessor(this.stage);          this.uiskin = new skin(gdx.files.internal("skin/uiskin.json"));          final textbutton plaintextbutton = new textbutton("hello", this.uiskin);         this.stage.addactor(plaintextbutton);          final group group = new group();         final textbutton grouptextbutton = new textbutton("group", this.uiskin);         group.addactor(grouptextbutton);         this.stage.addactor(group);          plaintextbutton.addaction(actions.moveby(100, 50));         group.addaction(actions.moveby(50, 100));          gdx.gl20.glclearcolor(0f, 0f, 0f, 1);         gdx.gl20.glblendfunc(gl20.gl_src_alpha, gl20.gl_one_minus_src_alpha);     }      @override public void render() {         this.stage.act();         gdx.gl20.glclear(gl20.gl_color_buffer_bit);         this.stage.draw();     }      @override public void dispose() {}     @override public void resize(final int width, final int height) {}     @override public void pause() {}     @override public void resume() {} }

hopefully gives enough information , bit of explanation scene2d.


Comments

Post a Comment

Popular posts from this blog

Perl - how to grep a block of text from a file -

-
it can in xml or text format. how in general grep block of text in perl? <track type="ws"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>0</locationindex> <propertyindex>0</propertyindex> </range> </track> <track type="ps" id="1"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>1</locationindex> <propertyindex>1</propertyindex> </range> </track> i want grep type="ps" , till </range> . one solution open file, read line line , match block. open(fh, "file.txt"); foreach $line (<fh>) { if ($line =~ m/type="cc"(.*?)<\/range>/) { print $1; } } but there more optimal solution without reading file line l
Read more

delphi - How to remove all the grips on a coolbar if I have several coolbands? -

-
Image
if set mycoolbar.fixedorder true,only grip on first band hidden. well,if use delphi 7 create vcl forms application,then put coolbar on , create 3 coolbans hold other controls,only grip , top coolbands can hidden setting mycoolbar.fixedorder:=true. i've uploaded picture make things clear. you got fixedorder property wrong. fixed property not allow bands rearranged if set true . setting property of coolbar true keep user changing bands order @ runtime, user can still move , resize bands. can give advice can do, actual solution problem, well, have wait answer. my advice use 3 coolbars in row , setting "fixedorder" property true , bandborderstyle bsnone . way grip hidden on of them. about property, it's not bug of ide, actual preference of property.
Read more

javascript - Animating array of divs; only the final element is modified -

-
this baffling me @ moment. i'm experienced programmer looking throw bit of surprise fiancee on countdown page our wedding. desired effect simulated confetti falling behind main page. setup follows: i have array of divs in javascript. each div absolutely positioned on page. have interval set updates every 50 or milliseconds. on each tick, run loop on array of divs, , calculations , update positions. problem problem having, however, though can see divs created, stored array, , modified (in case, each has slight randomized rotation) during initialization phase, once tick update position starts, div stored in whatever last slot of array gets position updated. tried hard-coding each div index testing purposes, strictly last element update position. upon printing current "left" , "top" style values each div before , after calculations shows value has been changed, no visible change noticeable. here's basic code: javascript var container;
Read more