Fwd: Display an image on a JPanel

[Christopher Coulon-2]

Begin forwarded message:

> From: Christopher Coulon <[hidden email]>
> Subject: Re: Display an image on a JPanel
> Date: October 24, 2013 5:09:24 PM PDT
> To: "ImageJ Interest Group <[hidden email]>" <[hidden email]>
>
> Have you tried developing in NetBeans or Eclipse?  I have found them very useful for developing plugins using panels.
>
> Chris Coulon
> gaiag.net
>
> On Oct 24, 2013, at 1:02 PM, Robert Lockwood <[hidden email]> wrote:
>
>> I found the error, the JPanel that the JImagePanel was added to had a
>> layout set to null, when I commented out that line the errors went away but
>> my GUI is messed up.  Some how there was a design error that didn't show
>> until I tried to add the JImagePanel or I screwed something up ...
>>
>> Thanks Curtis and Johannes.
>>
>>
>> On Thu, Oct 24, 2013 at 12:39 PM, Robert Lockwood <[hidden email]>wrote:
>>
>>> Thanks Curtis, I have minimal code that re-creates the problem with an
>>> application class, TestApp, and a single class, JImagePanel.
>>>
>>> I have no idea how to get them into github.  I've never had any
>>> cooperators with whom to collaborate so I'm absolutely ignorant of how to
>>> use github.
>>>
>>>
>>> On Thu, Oct 24, 2013 at 11:10 AM, Curtis Rueden <[hidden email]> wrote:
>>>
>>>> Hi Robert,
>>>>
>>>> Can you please post a complete example demonstrating the problem?
>>>> GitHub.com is a nice place to do this. It will make it much easier for
>>>> people to help you.
>>>>
>>>> Regards,
>>>> Curtis
>>>>
>>>>
>>>> On Thu, Oct 24, 2013 at 12:25 PM, Robert Lockwood <[hidden email]
>>>>> wrote:
>>>>
>>>>> In order to have an ImagePanel for my application I downloaded the
>>>>> JImagePanel from GitHub in response to Johannes reply, created a class
>>>> for
>>>>> it in my project changing the package to my package in Eclipse Keppler.
>>>>>
>>>>> In my GUI initialization where the GUI is built I have:
>>>>>
>>>>>      jImagePanel = new JImagePanel();
>>>>>      jImagePanel.setName("jImagePanel");
>>>>>      jImagePanel.setBorder(new LineBorder(new Color(0, 0, 0)));
>>>>>      jImagePanel.setBounds(10, 10, 641, 481);
>>>>>      jImagePanel.setBackground(Color.WHITE);
>>>>>      jImagePanel.setOpaque(false);
>>>>>      pnlBase.add(jImagePanel);
>>>>>
>>>>> when the image is read I display it with:
>>>>>
>>>>>      if (!jImagePanel.isOpaque()) {
>>>>>          jImagePanel.setOpaque(true);
>>>>>      }
>>>>>
>>>>>      jImagePanel.updateImage(imp);
>>>>>
>>>>> When I shift from Source to Design Google Builder crashes indicating
>>>>> problems in JImagePanel's method paintCompnent().
>>>>>
>>>>> When I attempt to run it the GUI does not display properly, the
>>>> contents of
>>>>> the JFrame are gray.  Moving the cursor over the contents exposes all
>>>> the
>>>>> JButtons, but nothing else, and clicking on the button results in the
>>>>> expected display of my file selector.  If the file is selected the image
>>>>> displays correctly as do all the other visual objects in the JFrame.
>>>>>
>>>>> I get NullPointerException errors that finger the same line that trying
>>>> to
>>>>> move to Display fingers.
>>>>>
>>>>> I modified the below code to check that imp was not null but it had no
>>>>> effect.
>>>>>
>>>>> Johannes gave another URL for the code but I don't know how to get that
>>>>> code.
>>>>>
>>>>> I guess I'm partway there ...
>>>>>
>>>>> From JImagePanel:
>>>>>
>>>>>  @Override
>>>>>  public void paintComponent(Graphics g) {
>>>>>      super.paintComponent(g);
>>>>>      try {
>>>>>          if (imageUpdated) {
>>>>>              imageUpdated = false;
>>>>>              imp.updateImage();
>>>>>          }
>>>>>          Java2.setBilinearInterpolation(g,
>>>>> Prefs.interpolateScaledImages);
>>>>>
>>>>>          Image img = imp.getProcessor().createImage();  // THIS IS
>>>> THE
>>>>> ERROR LINE
>>>>>
>>>>>          if (img != null) {
>>>>>              waitForImage(img);
>>>>>              int displayWidth = (int) (srcRect.width *
>>>> magnification);
>>>>>              int displayHeight = (int) (srcRect.height *
>>>> magnification);
>>>>>              Dimension size = getSize();
>>>>>              int offsetX = (size.width - displayWidth) / 2;
>>>>>              int offsetY = (size.height - displayHeight) / 2;
>>>>>              g.translate(offsetX, offsetY);
>>>>>              g.drawImage(img, 0, 0, displayWidth, displayHeight,
>>>>> srcRect.x,
>>>>>                      srcRect.y, srcRect.x + srcRect.width, srcRect.y
>>>>>                              + srcRect.height, null);
>>>>>          }
>>>>>          drawOverlay(g);
>>>>>      } catch (OutOfMemoryError e) {
>>>>>          IJ.outOfMemory("Paint");
>>>>>      }
>>>>>  }
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Oct 23, 2013 at 7:31 AM, Johannes Schindelin <
>>>>> [hidden email]> wrote:
>>>>>
>>>>>> Hi Robert,
>>>>>>
>>>>>> On Tue, 22 Oct 2013, Robert Lockwood wrote:
>>>>>>
>>>>>>> I've an application that collects a monochrome "image" as an array
>>>> of
>>>>>>> "unsigned short" (short[]), saves it as a TIFF (thanks for that
>>>> help)
>>>>>>> and displays it on JPanel.  I'd rather use the ImageJ methods etc.
>>>> to
>>>>>>> display the image on the JPanel and reduce my code.
>>>>>>>
>>>>>>> Is this possible?  How?
>>>>>>
>>>>>> Unfortunately, the ImageCanvas -- ImageJ 1.x' AWT component intended
>>>> to
>>>>>> display images -- is tightly bound to the ImageWindow class and does
>>>> not
>>>>>> play well with other components in the same AWT container.
>>>>>>
>>>>>> Besides, all the claims that AWT and Swing mix well now seem to be
>>>>>> premature still.
>>>>>>
>>>>>> Therefore we integrated Simon Andrews' JImagePanel into Fiji:
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>> https://github.com/fiji/fiji/blob/master/src-plugins/fiji-lib/src/main/java/fiji/util/gui/JImagePanel.java
>>>>>>
>>>>>> It should be relatively easy to integrate into your software: it is
>>>>>> contained in the fiji-lib artifact available at
>>>> http://maven.imagej.net/
>>>>> .
>>>>>>
>>>>>> You could also extract the file and insert into your own source code,
>>>> of
>>>>>> course, but you'd ask for diverging versions.
>>>>>>
>>>>>> Ciao,
>>>>>> Johannes
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> When I was 12 I thought I would live forever.
>>>>> So far, so good.
>>>>>
>>>>> --
>>>>> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>>>>>
>>>>
>>>> --
>>>> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>>>>
>>>
>>>
>>>
>>> --
>>> When I was 12 I thought I would live forever.
>>> So far, so good.
>>>
>>
>>
>>
>> --
>> When I was 12 I thought I would live forever.
>> So far, so good.
>>
>> --
>> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html