java - Zoom image in and out also change JscrollPane accroding to mouse position -

i want zoom image in when left mouse click , out when right mouse click, easy part. portion of image after zoom want show mouse is.

e.g image of car , mouse position on car wheel image should zoom focus should remain on car. that's tired far.

package paractice;  import java.awt.borderlayout; import java.awt.flowlayout; import java.awt.graphics2d; import java.awt.image; import java.awt.mouseinfo; import java.awt.point; import java.awt.pointerinfo; import java.awt.renderinghints; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.awt.event.mouseevent; import java.awt.event.mouselistener; import java.awt.event.mousemotionlistener; import java.awt.geom.affinetransform; import java.awt.image.bufferedimage; import java.io.file;  import javax.imageio.imageio; import javax.swing.imageicon; import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jlabel; import javax.swing.jpanel; import javax.swing.jscrollpane; import javax.swing.swingutilities;  public class zoom extends jpanel implements actionlistener, mouselistener, mousemotionlistener{      private static final long serialversionuid = 1l;     private jlabel imageadujuster = new jlabel();     private jpanel panel = new jpanel();     private jscrollpane pane = new jscrollpane();     private jbutton zoomin = new jbutton("zoom in");     private jbutton zoomout = new jbutton("zoom out");     private point point;     private bufferedimage image;     private double scale = 1;      /*      * constructor      */     public zoom() {          jpanel buttonpanel = new jpanel(new flowlayout(flowlayout.right));         buttonpanel.add(zoomout);         buttonpanel.add(zoomin);          panel.setlayout(new borderlayout());         panel.add(imageadujuster, borderlayout.center);         pane.setviewportview(panel);         pane.setautoscrolls(true);           setlayout(new borderlayout());         add(pane, borderlayout.center);         add(buttonpanel, borderlayout.south);          zoomout.addactionlistener(this);         zoomin.addactionlistener(this);          imageadujuster.addmouselistener(this);         imageadujuster.addmousemotionlistener(this);      }      private void getimage(string imagepath){         try {             file imagefile = new file(imagepath);             image = imageio.read(imagefile);             setimage(image);         }catch(exception e){             system.out.println("image file not found. "+ e.getmessage());         }     }      private void setimage(image image) {         imageadujuster.seticon(new imageicon(image));     }      private bufferedimage getscaledimage(double scale) {           int w = (int)(scale*image.getwidth());           int h = (int)(scale*image.getheight());           bufferedimage bi = new bufferedimage(w, h, image.gettype());           graphics2d g2 = bi.creategraphics();           g2.setrenderinghint(renderinghints.key_interpolation,                               renderinghints.value_interpolation_bicubic);           affinetransform @ = affinetransform.getscaleinstance(scale, scale);           g2.drawrenderedimage(image, at);           g2.dispose();           return bi;       }      public void zoomout(point point) {         setimage(getscaledimage(scale * 0.9));         point pos = pane.getviewport().getviewposition();          int newx = (int)(point.x*(0.9f - 1f) + 0.9f*pos.x);         int newy = (int)(point.y*(0.9f - 1f) + 0.9f*pos.y);         pane.getviewport().setviewposition(new point(newx, newy));          this.pane.revalidate();         this.pane.repaint();     }      /**      *       */     public void zoomin(point point) {         setimage(getscaledimage(scale * 1.1f));         point pos = pane.getviewport().getviewposition();          int newx = (int)(point.x*(1.1f - 1f) + 1.1f*pos.x);         int newy = (int)(point.y*(1.1f - 1f) + 1.1f*pos.y);         pane.getviewport().setviewposition(new point(newx, newy));          this.pane.revalidate();         this.pane.repaint();     }      public static void main(string args[]) {         jframe frame  = new jframe();          zoom zoom = new zoom();         zoom.getimage("c:\\users\\abcd1\\pictures\\picture.jpg");          frame.getcontentpane().add(zoom);         frame.pack();         frame.setvisible(true);     }      public void actionperformed(actionevent e) {          if(e.getsource() == zoomin) {             scale ++;             zoomin(point);         }          if(e.getsource() == zoomout) {             scale --;             zoomout(point);         }       }      public void mouseclicked(mouseevent e) {         if(swingutilities.isleftmousebutton(e)) {             scale += 1;             zoomin(point);         }          if(swingutilities.isrightmousebutton(e)) {             scale -= 1;             zoomout(point);         }     }      public void mousemoved(mouseevent e) {         pointerinfo info = mouseinfo.getpointerinfo();         point = info.getlocation();          system.out.println("point x "+point.x +" point y "+point.y);      }      public void mouseentered(mouseevent arg0) {}      public void mouseexited(mouseevent arg0) {}      public void mousepressed(mouseevent arg0) {}      public void mousereleased(mouseevent arg0) {}      public void mousedragged(mouseevent e) {}  } 

thank in advance.

to zoom , change jscrollpane position changed 2 methods , added scaleandzoom(double) :

public void zoomout(point point) {      scaleandzoom( scale * 0.9f); }  public void zoomin(point point) {      scaleandzoom( scale * 1.1f); }  private void scaleandzoom(double scale) {      setimage(getscaledimage(scale));      //calculation not quiet accurate. need improve      //see aqeel haider comment      int movex = (int) ((scale* point.x) - point.x ) ;     int movey = (int) ((scale* point.y) - point.y ) ;      rectangle view = pane.getviewport().getviewrect();     view.setbounds(view.x+movex,view.y+movey, view.width, view.height);      imageadujuster.scrollrecttovisible(view); }