java - Add a background image to JPanel with rounded corners -

i've extended jpanel use in project want appear more "3d". that's bosses' way of requiring shadowing , rounded corners on components. that's been accomplished shown on many online examples. did this:

public class roundedpanel extends jpanel {     protected int _strokesize = 1;     protected color _shadowcolor = color.black;     protected boolean _shadowed = true;     protected boolean _highquality = true;     protected dimension _arcs = new dimension(30, 30);     protected int _shadowgap = 5;     protected int _shadowoffset = 4;     protected int _shadowalpha = 150;      protected color _backgroundcolor = color.light_gray;      public roundedpanel()     {         super();         setopaque(false);     }      @override     public void setbackground(color c)     {         _backgroundcolor = c;     }      @override     protected void paintcomponent(graphics g)     {         super.paintcomponent(g);          int width = getwidth();         int height = getheight();         int shadowgap = this._shadowgap;         color shadowcolora = new color(_shadowcolor.getred(), _shadowcolor.getgreen(), _shadowcolor.getblue(), _shadowalpha);         graphics2d graphics = (graphics2d) g;          if(_highquality)         {             graphics.setrenderinghint(renderinghints.key_antialiasing, renderinghints.value_antialias_on);         }          if(_shadowed)         {             graphics.setcolor(shadowcolora);             graphics.fillroundrect(_shadowoffset, _shadowoffset, width - _strokesize - _shadowoffset,                     height - _strokesize - _shadowoffset, _arcs.width, _arcs.height);         }         else         {             _shadowgap = 1;         }          graphics.setcolor(_backgroundcolor);         graphics.fillroundrect(0,  0, width - shadowgap, height - shadowgap, _arcs.width, _arcs.height);         graphics.setstroke(new basicstroke(_strokesize));         graphics.setcolor(getforeground());         graphics.drawroundrect(0,  0, width - shadowgap, height - shadowgap, _arcs.width, _arcs.height);         graphics.setstroke(new basicstroke());     } } 

i creating test frame following code:

public class uitest {     private static jframe mainframe;     private static imagepanel mainpanel;      public static void main(string[] args)     {         eventqueue.invokelater(new runnable()         {             public void run()             {                 mainframe = new jframe();                 mainframe.setvisible(true);                  try                 {                     mainpanel = new imagepanel(imageio.read(this.getclass().getresource("/content/diamondplate_light.jpg")));                     //mainpanel.setbounds(0, 0, 800, 600);                 }                 catch(ioexception e)                 {                  }                 mainpanel.setlayout(null);                  roundedpanel rpanel = new roundedpanel();                 rpanel.setbounds(10, 10, 200, 200);                 rpanel.setbackground(new color(168, 181, 224));                  mainpanel.add(rpanel);                  rpanel = new roundedpanel();                 rpanel.setbounds(220, 10, 560, 200);                 rpanel.setbackground(new color(168, 224, 168));                  mainpanel.add(rpanel);                  rpanel = new roundedpanel();                 rpanel.setbounds(10, 220, 770, 300);                 rpanel.setbackground(new color(224, 168, 168));                  mainpanel.add(rpanel);                  mainframe.setsize(800, 600);                 mainframe.getcontentpane().add(mainpanel);             }         });     } } 

and results in (sans background image of jframe's contentpane:

what generate red, green, , blue panels rounded corners, filled different image instead of color. still want rounded corners, i'm unsure of how this.

if i've got large texture, can "clip" piece of out in size , shape of roundedpanel? need evaluate this, since occurred me typed, if can create piece of geometry used in graphics.fillroundrect(...) , clip image, work.

are there other ways of doing i'm missing? i'd appreciate feedback might able offer. thanks.

edit:

based upon idea in selected solution below, i've got following results:

it needs whipped shape production , background images poorly chosen, demo, following roundedpanel code gets above results:

public class roundedpanel extends jpanel {     protected int strokesize = 1;     protected color _shadowcolor = color.black;     protected boolean shadowed = true;     protected boolean _highquality = true;     protected dimension _arcs = new dimension(30, 30);     protected int _shadowgap = 5;     protected int _shadowoffset = 4;     protected int _shadowalpha = 150;      protected color _backgroundcolor = color.light_gray;     protected bufferedimage image = null;      public roundedpanel(bufferedimage img)     {         super();         setopaque(false);          if(img != null)         {             image = img;         }     }      @override     public void setbackground(color c)     {         _backgroundcolor = c;     }      @override     protected void paintcomponent(graphics g)     {         super.paintcomponent(g);          int width = getwidth();         int height = getheight();         int shadowgap = this._shadowgap;         color shadowcolora = new color(_shadowcolor.getred(), _shadowcolor.getgreen(), _shadowcolor.getblue(), _shadowalpha);         graphics2d graphics = (graphics2d) g;          if(_highquality)         {             graphics.setrenderinghint(renderinghints.key_antialiasing, renderinghints.value_antialias_on);         }          if(shadowed)         {             graphics.setcolor(shadowcolora);             graphics.fillroundrect(_shadowoffset, _shadowoffset, width - strokesize - _shadowoffset,                     height - strokesize - _shadowoffset, _arcs.width, _arcs.height);         }         else         {             _shadowgap = 1;         }          roundrectangle2d.float rr = new roundrectangle2d.float(0, 0, (width - shadowgap), (height - shadowgap), _arcs.width, _arcs.height);          shape clipshape = graphics.getclip();          if(image == null)         {             graphics.setcolor(_backgroundcolor);             graphics.fill(rr);         }         else         {             roundrectangle2d.float rr2 =  new roundrectangle2d.float(0, 0, (width - strokesize - shadowgap), (height - strokesize - shadowgap), _arcs.width, _arcs.height);              graphics.setclip(rr2);             graphics.drawimage(this.image, 0, 0, null);             graphics.setclip(clipshape);         }          graphics.setcolor(getforeground());         graphics.setstroke(new basicstroke(strokesize));         graphics.draw(rr);         graphics.setstroke(new basicstroke());     } } 

thanks help.

try "clipping area" (see g.setclip() call):

public static void main(string[] args) {     jframe f = new jframe();     f.setsize(new dimension(600, 400));     f.getcontentpane().setlayout(null);     roundpanel rp = new roundpanel();     rp.setbounds(100, 50, 400, 300);     f.getcontentpane().add(rp);     f.setvisible(true); }  static class roundpanel extends jpanel {     @override     protected void paintcomponent(graphics g) {         // prepare red rectangle         bufferedimage bi = new bufferedimage(400, 300, bufferedimage.type_int_argb);         graphics2d gb = bi.creategraphics();         gb.setpaint(color.red);         gb.fillrect(0, 0, 400, 300);         gb.dispose();          // set rounded clipping region:         roundrectangle2d r = new roundrectangle2d.float(0, 0, 400, 300, 20, 20);         g.setclip(r);          // draw rectangle (and see whether has round corners)         g.drawimage(bi, 0, 0, null);     } } 

beware of restrictions mentioned in api doc graphics.setclip:

sets current clipping area arbitrary clip shape. not objects implement shape interface can used set clip. shape objects guaranteed supported shape objects obtained via getclip method , via rectangle objects.