java - Is JAVA2D the only rendering mode to display transparent PGraphics objects in Processing? -

is java2d rendering mode in processing in pgraphics objects can displayed transparent background (as opposed p2d , p3d)? have tried rewriting code in other 2 modes (p3d, p2d) backgrounds of pgraphics turn out opaque (black default)---perhaps i'm missing method turn them transparent? pngs i'm displaying in pgraphics objects turning out transparent expected; it's backgrounds of pgraphics opaque. working on project , have selected java2d in order keep pgraphics transparent, wonder if can alternately use p3d , features instead.

from looking around online believe java2d mode render pgraphics transparent in earlier versions of processing (1.*), , i'm wondering if has changed version 2?

thanks in advance clarification , help!

update:

below sample of code (written in eclipse in java processing component). v.k.'s reply works great (with pngs) in processing pde, i've been unsuccessful getting work in project in eclipse. thoughts? :

main class:

package tester;  import java.util.arraylist; import processing.core.*;  public class graphicsmain extends papplet{ int screenwidth = 800; int screenheight = 500; pgraphicsmaker pgm = new pgraphicsmaker(this); arraylist<pgraphics> motifarray = new arraylist<pgraphics>();   public void setup() {     size(screenwidth,screenheight,p3d);     background(0);      motifarray = pgm.makemotifarray();      if (motifarray.get(0) == null) {         system.out.println("the motif array unfilled!");     } }  public void draw() {     (int = 0; < motifarray.size(); ++) {         image(motifarray.get(i),200+(10*i),100);      }   }  static public void main(string[] passedargs) {     string[] appletargs = new string[] { "graphicsmain" };     if (passedargs != null) {         papplet.main(concat(appletargs, passedargs));     } else {         papplet.main(appletargs);     } } 

second class:

package tester;  import java.util.arraylist; import processing.core.*;  public class pgraphicsmaker { string filepath = "/a/filepath/here/"; papplet parent; int populationsamplesize = 16; int stagewidth = 100; int stageheight = 400; arraylist<pgraphics> motifarray; pimage pic; pimage pic2;  public pgraphicsmaker(papplet pa) {     parent = pa;     pic = parent.loadimage(filepath + "small_jones6.png");     pic2 = parent.loadimage(filepath + "small_dresser10.png"); }   public arraylist makemotifarray() {     string filepathtemppngs = "/a/filepath/here/temppngs/";     arraylist<pgraphics> motifarray = new arraylist<pgraphics>();       (int = 0; < populationsamplesize; i++) {                motifarray.add(parent.creategraphics(stagewidth,stageheight,parent.p3d));         motifarray.get(i).begindraw();         motifarray.get(i).background(255, 255, 255, 0);         motifarray.get(i).image(pic,10,10,100,90);         motifarray.get(i).image(pic2,10,50,50,50);         motifarray.get(i).enddraw();         motifarray.get(i).save(filepathtemppngs + "motif" + + ".png");     }     return motifarray; } } 

note: i'm not last save() function necessary in makemotifarray() in second class (just attempt preserve transparency).

the code below worked me in 1.5.1 , 2.0b8... if got right doing need... check out:

pgraphics p;  void setup(){   size(400,400,p3d);   p = creategraphics(400,400,p3d);   smooth();   stroke(180,90,210);  }  void draw(){   background(180,90,210);   p.begindraw();   p.background(220, 180, 40,0);   p.nofill();   p.stroke(220, 180, 40);   p.translate(width/2 - (width/2 - mousex), height/2, 400-mousey*5);   p.sphere(100);   p.enddraw();   pushmatrix();   translate(width/2, height/2, -200);   rotatey(radians(framecount));   rotatex(radians(framecount/2));   box(100);   popmatrix();   image(p,0,0); }