Mouse wheel and zooming

[Jon Harman]

Hi,

I just noticed that when zoomed in my mouse wheel scrolls the image
vertically.  That is great!  I have lots of problems with the space bar
zooming.  For instance unless I remember to click on the image the space
bar will push the last used button on my plugin.  I tried all sorts of
other keys (cntrl, shift, etc) to get the wheel to scroll horizontally
but couldn't find one.  Is there any way to get this functionality?

Jon

[Leon Espinosa]

Hello,  I have modified the plugin scrollable-stackwindow (by  
Johannes Schindlin) to have a mouse wheel control of the current  
image/stack... it allows fast "zoom in - zoom out" in different zones  
of the image, I hope it helps to you...

Leon

//---------------------------------------------

import ij.IJ;
import ij.ImagePlus;
import ij.gui.ImageCanvas;
import ij.gui.StackWindow;
import ij.plugin.PlugIn;
import ij.plugin.*;

import java.awt.event.MouseWheelListener;
import java.awt.event.MouseWheelEvent;

public class Scrollable_Zoom implements PlugIn {
        public void run(String arg) {
                ImagePlus image = IJ.getImage();
                image.setWindow(new Window(image, image.getCanvas()));
        }

        static class Window extends StackWindow implements MouseWheelListener {
                public Window(ImagePlus image, ImageCanvas canvas) {
                        super(image, canvas);
                        addMouseWheelListener(this);
                }

                public void mouseWheelMoved(MouseWheelEvent event) {
                        synchronized(this) {
                                int zoom = event.getWheelRotation();
                                if (zoom<0) IJ.run("In");
                                else IJ.run("Out");
                        }
                }
        }
}

//---------------------------------------------------------


Le 23 mai 07 à 00:16, Jon Harman a écrit :

> Hi,
>
> I just noticed that when zoomed in my mouse wheel scrolls the image  
> vertically.  That is great!  I have lots of problems with the space  
> bar zooming.  For instance unless I remember to click on the image  
> the space bar will push the last used button on my plugin.  I tried  
> all sorts of other keys (cntrl, shift, etc) to get the wheel to  
> scroll horizontally but couldn't find one.  Is there any way to get  
> this functionality?
>
> Jon
>

Leon Espinosa
[hidden email]

Laboratoire des Rickettsies du Pr. RAOULT
UMR CNRS 6020
Fac. de Medecine de la Timone
27 Bd Jean Moulin
13005 Marseille

tel  [phone]
fax [phone]

portable  06 79 25 97 40

[Jon Harman]

Hi,

Thanks!  That shows me how to implement my own MouseWheelListener and it
gave me a clue of where to search the IJ code for the scrolling behavior.
I see that horizontal scrolling requires the space bar be down.  Below
is my solution which avoids the space key.
Questions
How do I disable the default spacebar behavior in my panel.  
IJ.spaceBarDown() doesn't appear to work in my action listener that gets
the button clicks.

Why does IJ use the space bar instead of (say) the ctrl or shift key?
Shift or ctrl is typically used as a modification key, the space bar is not.

Why no IJ.ctrlKeyDown()?  I guess the ctrl key must be handled differently.

Jon

      /* implement mw zoom and pan */
      public void mouseWheelMoved(MouseWheelEvent event) {
          synchronized(this) {
              int rotation = event.getWheelRotation();
              int width = imp.getWidth();
              int height = imp.getHeight();
              Rectangle srcRect = ic.getSrcRect();
              int xstart = srcRect.x;
              int ystart = srcRect.y;
             if(IJ.altKeyDown()){
                  srcRect.y += rotation*Math.max(height/200, 1);
                  if (srcRect.y<0) srcRect.y = 0;
                  if (srcRect.y+srcRect.height>height) srcRect.y =
height-srcRect.height;
                   if (srcRect.x!=xstart || srcRect.y!=ystart)
                      ic.repaint();
              }
              else if(IJ.shiftKeyDown()){
                    srcRect.x += rotation*Math.max(width/200, 1);
                  if (srcRect.x<0) srcRect.x = 0;
                  if (srcRect.x+srcRect.width>width) srcRect.x =
width-srcRect.width;
                  if (srcRect.x!=xstart || srcRect.y!=ystart)
                      ic.repaint();
              }
              else {
                  if (rotation<0) IJ.run("In");
                  else IJ.run("Out");
              }
          }
      }

Leon Espinosa wrote:

> Hello,  I have modified the plugin scrollable-stackwindow (by Johannes
> Schindlin) to have a mouse wheel control of the current image/stack...
> it allows fast "zoom in - zoom out" in different zones of the image, I
> hope it helps to you...
>
> Leon
>
> //---------------------------------------------
>
> import ij.IJ;
> import ij.ImagePlus;
> import ij.gui.ImageCanvas;
> import ij.gui.StackWindow;
> import ij.plugin.PlugIn;
> import ij.plugin.*;
>
> import java.awt.event.MouseWheelListener;
> import java.awt.event.MouseWheelEvent;
>
> public class Scrollable_Zoom implements PlugIn {
>     public void run(String arg) {
>         ImagePlus image = IJ.getImage();
>         image.setWindow(new Window(image, image.getCanvas()));
>     }
>
>     static class Window extends StackWindow implements
> MouseWheelListener {
>         public Window(ImagePlus image, ImageCanvas canvas) {
>             super(image, canvas);
>             addMouseWheelListener(this);
>         }
>
>         public void mouseWheelMoved(MouseWheelEvent event) {
>             synchronized(this) {
>                 int zoom = event.getWheelRotation();
>                 if (zoom<0) IJ.run("In");
>                 else IJ.run("Out");
>             }
>         }
>     }
> }
>
> //---------------------------------------------------------
>
>
> Le 23 mai 07 à 00:16, Jon Harman a écrit :
>
>> Hi,
>>
>> I just noticed that when zoomed in my mouse wheel scrolls the image
>> vertically.  That is great!  I have lots of problems with the space
>> bar zooming.  For instance unless I remember to click on the image
>> the space bar will push the last used button on my plugin.  I tried
>> all sorts of other keys (cntrl, shift, etc) to get the wheel to
>> scroll horizontally but couldn't find one.  Is there any way to get
>> this functionality?
>>
>> Jon
>>
>
> Leon Espinosa
> [hidden email]
>
> Laboratoire des Rickettsies du Pr. RAOULT
> UMR CNRS 6020
> Fac. de Medecine de la Timone
> 27 Bd Jean Moulin
> 13005 Marseille
>
> tel  [phone]
> fax [phone]
>
> portable  06 79 25 97 40
>

[Michael Schmid]

Hi Jon,

the spacebar is used for panning by many programs, such as
Photoshop, gimp, some CAD programs and others. I like the idea
of having the same shortcuts/modifiers in Photoshop and ImageJ,
even though ImageJ, as it is getting better and better, takes
over many tasks that I did in Photoshop previously.

Michael
________________________________________________________________

On 23 May 2007, at 18:46, Jon Harman wrote:

> Why does IJ use the space bar instead of (say) the ctrl or shift  
> key? Shift or ctrl is typically used as a modification key, the  
> space bar is not.

[Damien Haton-Pietrin]

> ------------------------------------------------------------------------------
> ---------

>
>
>
Dear list member,
We actually want to use imageJ with LEICA system contructing on Macrozoom
The software provided by constructor is not a usefull tool and is not
working on Mac....
Someone use mac with ImageJ and aquire live image...
Regards

Dr. Damien PIETRIN
-Department of Anaesthesia and Critical Care
University Hospital, Pôle Mère-Enfants Spécialités
4, Rue Larrey
F49033 Angers CEDEX
France
Mail : [hidden email]
Tel: [phone]
Poste 42598

Dr. Damien PIETRIN
-Laboratory of Experimental Anaesthesiology, Neurobiology, Neuropharmacology
and Transgenesis UPRES EA 3143.
Bâtiment Montéclaire
4, Rue Larrey
F49033 Angers CEDEX
France
mail: [hidden email]
Tel [phone]
Poste 42598

 

[Adrian Daerr]

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> Why does IJ use the space bar instead of (say) the ctrl or shift key?
> Shift or ctrl is typically used as a modification key, the space bar is
> not.

Beware that the ctrl-mouse-wheel triggers a zoom into the desktop on
MacOS X. It might be possible to turn this off, but maybe avoid ctrl (or
use Cmd or Shift on Macs).

> I just noticed that when zoomed in my mouse wheel scrolls the image
> vertically.  That is great!

Only if you are not in a stack (where the mouse wheel controls the slice
number).
Personnally I am not very fond of using the (1D) mouse-wheel to scroll
around (using it for Z-scrolling and/or zooming in/out seems a more
intuitive job for a 1D device), I prefer Space-bar+mouse-dragging. But
tastes/preferences vary.

Note that the "panning bug while defining a ROI" (which I mentioned in
the concurrent thread "zoom with scroll bars") appears in a slightly
modified form with mouse-wheel panning: If you pan horizontally
(space+mouse-wheel) while defining a rectangular ROI and by mistake move
the mouse (space+mouse-move: pan by dragging), the image jumps to an
entirely different location.

While mouse-wheel-panning (vertically or horizontally) the active ROI
corner does not stick to the mouse cursor, but that is only a minor bug:
it will jump to the cursor once you let go the space key and move the mouse.
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