How can I implement a Zoom Panel with Java Swing libraries -


i've implemented jframe java swing libraries visualize map. i'd realize zoom function within frame. code of jframe:

package components;  import java.awt.borderlayout; import java.awt.container; import javax.swing.jframe; import javax.swing.jscrollpane;     public class myframe extends jframe {  private static final long serialversionuid = 1l; private container contentpane; public static final int startwidth = 1280; public static final int startheight = 800; public static mypanel earthpanel;  public myframe(){     initcomponents(); }   public void initcomponents(){     contentpane = getcontentpane();     this.settitle("tle graphic propagator");     this.setdefaultcloseoperation(jframe.exit_on_close);     this.setsize(startwidth, startheight);     this.setlocation(0,0);     this.setlayout(new borderlayout());     earthpanel = new mypanel(startwidth,startheight);     jscrollpane scroll = new jscrollpane(earthpanel,     jscrollpane.vertical_scrollbar_always, jscrollpane.horizontal_scrollbar_always);     myslider slider = new myslider();     contentpane.add(scroll, borderlayout.center);     contentpane.add(slider, borderlayout.south); } }

as can see above, frame contains jpanel in jscrollpane , jslider use zoom function. follows code of panel..

package components;  import java.awt.dimension; import java.awt.graphics; import java.awt.graphics2d; import java.awt.image.bufferedimage; import java.io.file; import javax.imageio.imageio; import javax.swing.jpanel;  public class mypanel extends jpanel{  private static final long serialversionuid = 1l; private bufferedimage img; private int width, height; private string path = "images/earth1280x800.jpg"; private static final int update_rate = 10;  //#volte al secondo   public mypanel(int larghezzaframe, int altezzaframe){         width = larghezzaframe;     height = altezzaframe;      this.setpreferredsize(new dimension(width, height));      img = loadimage(); }   public bufferedimage loadimage() {     bufferedimage bimg = null;     bufferedimage ret = null;     try {         bimg = imageio.read(new file(path));     } catch (exception e) {         e.printstacktrace();     }     ret = new bufferedimage(bimg.getwidth(), bimg.getheight(), bufferedimage.type_int_argb);     graphics2d g = ret.creategraphics();     g.drawimage(bimg, 0, 0, null);     g.dispose();      return ret; }  @override protected void paintcomponent(graphics g) {     setopaque(false);      graphics2d g2d = (graphics2d)g;     g2d.scale(myslider.scale, myslider.scale);     g2d.drawimage(img, 0, 0, null);      super.paintcomponent(g2d); }  }

..and slider's one:

package components;  import java.awt.dimension;  import javax.swing.jslider; import javax.swing.event.changeevent; import javax.swing.event.changelistener;  public class myslider extends jslider implements changelistener{  private static final long serialversionuid = 1l; public static double scale = 1;  public myslider(){     super(jslider.horizontal, 100, 400, 100);     setmajortickspacing(50);       setminortickspacing(10);       setpaintticks(true);       setpaintlabels(true);       addchangelistener(this);    }  @override public void statechanged(changeevent arg0) {     int value = ((jslider) arg0.getsource()).getvalue();       scale = value/100.0;      myframe.earthpanel.setpreferredsize(new dimension((int)(myframe.startwidth * myslider.scale),(int)(myframe.startheight * myslider.scale)));     myframe.earthpanel.repaint(); }  }

to run code, need insert following main function:

package main;  import components.myframe;  public class mainpersonalframe { public static void main(string[] args){     myframe frame = new myframe();     frame.setvisible(true); } }

note: necessary insert package "images" in same path of source code image called "earth1280x800.jpg" that.

the problem comes out when use zoom function, scrolling right/left , up/down, image not contained frame anymore. i'd automatic refresh of scrollbars , image doesn't come out borders. how should it?

thanks everyone.

i'm not 100% sure problem is, suspect issue you're not changing preferred size of image jpanel when image changes size. if so, solution override getpreferredsize() in image displaying jpanel , return dimension matches of zoomed image.

edit, no, sort of this, you're not revalidating nor repainting jscrollpane's viewport, , must do.

import java.awt.borderlayout; import java.awt.container; import java.awt.dimension; import java.awt.graphics; import java.awt.graphics2d; import java.awt.image.bufferedimage; import java.io.ioexception; import java.net.url;  import javax.imageio.imageio; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.jscrollpane; import javax.swing.jslider; import javax.swing.event.changeevent; import javax.swing.event.changelistener;  public class mainpersonalframe {    public static void main(string[] args) {       myframe frame = new myframe();       frame.setvisible(true);    } }  class myframe extends jframe {     private static final long serialversionuid = 1l;    private container contentpane;    public static final int startwidth = 1280;    public static final int startheight = 800;     // !! should private , not static    private mypanel earthpanel;     // !! should field    private jscrollpane scroll;     public myframe() {       initcomponents();    }     public void initcomponents() {       contentpane = getcontentpane();       this.settitle("tle graphic propagator");       this.setdefaultcloseoperation(jframe.exit_on_close);        // !! avoid setting sizes if possible       this.setsize(startwidth, startheight);       this.setlocation(0, 0);       this.setlayout(new borderlayout());       earthpanel = new mypanel(startwidth, startheight);        // !! again, scroll field       scroll = new jscrollpane(earthpanel,             jscrollpane.vertical_scrollbar_always,             jscrollpane.horizontal_scrollbar_always);       myslider slider = new myslider(this);       contentpane.add(scroll, borderlayout.center);       contentpane.add(slider, borderlayout.south);    }     // !! avoid having classes directly manipulate other class's fields    public void setearthpanelsize(dimension size) {       earthpanel.setpreferredsize(size);    }     // !! allow other classes ability revalidate/repaint viewport    public void revalidateviewport() {       scroll.getviewport().revalidate();       scroll.getviewport().repaint();    } }  class mypanel extends jpanel {     private static final long serialversionuid = 1l;    private bufferedimage img;    private int width, height;     // !! changes can run program    // !! internet image    // !! private string path = "images/earth1280x800.jpg";    private string urlpath = "http://image.desk7.net/"          + "space%20wallpapers/1422_1280x800.jpg";     // !! private static final int update_rate = 10; // !! never used     public mypanel(int larghezzaframe, int altezzaframe) {       setopaque(false); // !! should here       width = larghezzaframe;       height = altezzaframe;        this.setpreferredsize(new dimension(width, height));        img = loadimage();    }     public bufferedimage loadimage() {       bufferedimage bimg = null;       bufferedimage ret = null;       try {          url imgurl = new url(urlpath);          // !! bimg = imageio.read(new file(path)); // !!          bimg = imageio.read(imgurl); // !! use image available          // !! } catch (exception e) {          // e.printstacktrace();       } catch (ioexception e) {          // !! use more specific exception          e.printstacktrace();       }       ret = new bufferedimage(bimg.getwidth(), bimg.getheight(),             bufferedimage.type_int_argb);       graphics2d g = ret.creategraphics();       g.drawimage(bimg, 0, 0, null);       g.dispose();        return ret;    }     @override    protected void paintcomponent(graphics g) {       // !! shouldn't in paintcomponent:       // !! setopaque(false);         graphics2d g2d = (graphics2d) g;       g2d.scale(myslider.scale, myslider.scale);       g2d.drawimage(img, 0, 0, null);       super.paintcomponent(g2d);    }  }  class myslider extends jslider implements changelistener {     private static final long serialversionuid = 1l;    public static double scale = 1;    private myframe myframe;     public myslider(myframe myframe) {       super(jslider.horizontal, 100, 400, 100);       this.myframe = myframe;       setmajortickspacing(50);       setminortickspacing(10);       setpaintticks(true);       setpaintlabels(true);       addchangelistener(this);    }     @override    public void statechanged(changeevent arg0) {       int value = ((jslider) arg0.getsource()).getvalue();       scale = value / 100.0;       int w = (int) (myframe.startwidth * myslider.scale);       int h = (int) (myframe.startheight * myslider.scale);       dimension size = new dimension(w, h);       myframe.setearthpanelsize(size); // !!       myframe.revalidateviewport(); // !!       // !! myframe.earthpanel.repaint(); // no, don't    } }

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