opengl - Java JOGL2 and Mouse Listeners -

i've been using jogl2 java , i'm having issue mouse event listeners. can mouse listener update x , y position if use public void mousedragged(mouseevent e), not redraw on public void display(glautodrawable gldrawable)

here's how code works: main method window , listeners constructed

 import java.awt.event.windowadapter;  import java.awt.event.windowevent;   import javax.media.opengl.gl2;  import javax.media.opengl.glcapabilities;  import javax.media.opengl.gleventlistener;  import javax.media.opengl.glprofile;  import javax.media.opengl.awt.glcanvas;  import javax.swing.jframe;   import javax.media.opengl.glautodrawable;   public class helloworld   {      public static void main(string[] args)       {       // setup opengl version 2     glprofile profile = glprofile.get(glprofile.gl2);     glcapabilities capabilities = new glcapabilities(profile);     renderer render = new renderer();      // canvas widget that's drawn in jframe     glcanvas glcanvas = new glcanvas(capabilities);     glcanvas.addgleventlistener(render);     glcanvas.addmouselistener(render);     glcanvas.addmousemotionlistener(render);     glcanvas.setsize( 800, 600 );        jframe frame = new jframe( "graphics demo" );        frame.getcontentpane().add( glcanvas);       // shutdown program on windows close event      frame.addwindowlistener(new windowadapter()       {           public void windowclosing(windowevent ev) {             system.exit(0);          }      });      frame.setsize( frame.getcontentpane().getpreferredsize() );     frame.setvisible( true );    }  } 

here opengl rendering class, renders 1 frame , not re-render unless adjust window size reason. if decide use mouse listener, update values not update rendering. why this?

 import java.io.*;  import javax.imageio.imageio;  import javax.media.opengl.gl2;  import javax.media.opengl.glautodrawable;  import javax.media.opengl.gleventlistener;  import javax.media.opengl.glu.glu;  import java.awt.dimension;  import java.awt.frame;  import java.awt.event.mouseevent;  import java.awt.event.windowadapter;  import java.awt.event.windowevent;  import javax.media.opengl.glautodrawable;  import javax.media.opengl.glcapabilities;  import javax.media.opengl.gleventlistener;  import javax.media.opengl.glprofile;  import javax.media.opengl.awt.glcanvas;  import com.jogamp.opengl.util.fpsanimator;   import javax.media.opengl.glu.gluquadric;   import java.awt.graphics2d;  import java.awt.color.colorspace;   import java.awt.image.bufferedimage;  import java.awt.image.componentcolormodel;  import java.awt.image.databuffer;  import java.awt.image.databufferbyte;  import java.awt.image.raster;  import java.awt.image.writableraster;  import java.io.ioexception;  import java.nio.bytebuffer;  import java.awt.event.*;   class renderer implements gleventlistener, mouselistener, mousemotionlistener  {      private glu glu = new glu();     float x = 1;     float y = 1;     float z = 1;      private gluquadric quadric;     glcanvas canvas;  public void init(glautodrawable gldrawable)  {     system.out.println("init called"); }  public void display(glautodrawable gldrawable)  {      final gl2 gl = gldrawable.getgl().getgl2();     gl.glclear(gl2.gl_color_buffer_bit | gl2.gl_depth_buffer_bit);      /*models loaded here*/     gl.glloadidentity();     gl.gltranslatef(0.0f, -9.0f, -150.0f); //-1.5f 0.0f -6.0f     gl.glrotatef(15f+x, 45f+x, 0f+y,0f); //15 45 0 0       objloader playingfield = new objloader("playingfield.obj", "crema_timber.jpg");     objloader coin = new objloader("coin.obj","early_shilling.jpg");     objloader tower = new objloader("tower1.obj","stone.jpg");     objloader tower2 = new objloader("tower2.obj","stone.jpg");      /* 3d rendering computed here */     playingfield.drawmodel(gl);     coin.drawmodel(gl);          tower.drawmodel(gl);     tower2.drawmodel(gl);   }      public void displaychanged(glautodrawable gldrawable, boolean modechanged, boolean devicechanged)  {     system.out.println("displaychanged called"); }    public void reshape(glautodrawable gldrawable, int x, int y, int width, int height)  {     system.out.println("reshape() called: x = "+x+", y = "+y+", width = "+width+", height = "+height);      final gl2 gl = gldrawable.getgl().getgl2();       if (height <= 0)      {         height = 1;      }      final float h = (float) width / (float) height;      gl.glviewport(0, 0, width, height);     gl.glmatrixmode(gl2.gl_projection);     gl.glloadidentity();     glu.gluperspective(45.0f, h, 1.0, 200.0);     gl.glmatrixmode(gl2.gl_modelview);     gl.glloadidentity(); }    public void dispose(glautodrawable arg0)   { system.out.println("dispose() called");  }     @override  public void mouseclicked(mouseevent arg0)   {        // todo auto-generated method stub      system.out.println("mouse clicked");  }    @override  public void mouseentered(mouseevent arg0)   {      // todo auto-generated method stub      system.out.println("mouse entered frame");  }    @override  public void mouseexited(mouseevent arg0)   {      // todo auto-generated method stub      system.out.println("mouse exited frame");  }    @override  public void mousepressed(mouseevent arg0)   {      // todo auto-generated method stub      system.out.println("mouse pressed.");  }    @override  public void mousereleased(mouseevent arg0)   { // todo auto-generated method stub system.out.println("mouse has been released");  }   //here problem, display not update input  @override  public void mousedragged(mouseevent e)   { // todo auto-generated method stub system.out.println("mouse being dragged"); x = e.getx(); y = e.gety();  system.out.println("x = "+x); system.out.println("y = "+y);     }    @override  public void mousemoved(mouseevent arg0)   { // todo auto-generated method stub system.out.println("mouse has moved.");  }   } 

you may notice there functions say: objloader = new objloader("something.obj", "something.jpg");

i have class loads obj files , textures them, drawing function simple, reads in data in arrays , calls gldrawarrays (also note imports, used later).

the last thing need figure out way mouse update

in helloworld class should start animator:

fpsanimator animator = new fpsanimator(canvas, 60); animator.start();