MATLAB: Waitbar color, 2016a is broken red; how to set to older continuous green

MATLABwaitbar colorxyz

In 2016a waitbar had red color with discrete marks. Older version is continuous green bar.

How to set the waitbar to the old fashion?

Best Answer

waitbar() creates a figure. In R2016a (did not check other HG2 implementations), that figure has a hidden member in Children which is a JavaWrapper . That JavaWrapper has a JavaPeer which is a javax.swing.JProgressBar which is what is doing the real work. There is no foreground color property above that level.

I have difficulty chasing below that level as I am not very familiar with Java. On my system if I use getForeground on the JavaPeer then the result is java.awt.Color[r=255,g=0,b=0] which would be full red -- but in fact on my system, OS-X El Capitan, the actual color for my progress bars is blue. I can construct a new color and use setForeground on the JavaPeer but it makes no difference. If I use getGraphics on the JavaPeer, and getColor on the result of that, I get told java.awt.SystemColor[i=9] but I have not been able to figure out how the i=9 translates into colors. Meanwhile getBackground on the getGraphics replies with com.apple.laf.AquaImageFactory$SystemColorProxy[r=238,g=238,b=238] which is plausible for the background I observe.

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MATLAB: How to change the Java Virtual Machine (JVM) that MATLAB is using on Windows

MATLAB ships with one specific version of the JVM software on Windows depending on the release. MATLAB is fully supported only on these shipped versions of the JVM software. Some components might not work properly under a different version of the JVM software. For example, calling functions in a dynamically linked library that was created with a different JVM software version than that used by MATLAB might cause a segmentation violation error message.

If you choose to change the JVM software version used by MATLAB, you must:

1. Download and install the desired version of the JRE (Java Runtime Environment) or the JDK (Java Development Kit). The latter contains the JRE and development tools.

2. Determine the path of the JRE directory within that installation. This varies by platform and whether you downloaded the JRE or JDK (see below).

3. Set the MATLAB_JAVA environment variable to this path (see below).

4. Start MATLAB while that environment variable is set (see below).

Setting MATLAB to use new Java

Make sure you download the 32 or 64-bit version of the JDK or JRE, depending on your platform. To determine which platform you have, you can issue the following in MATLAB:

>> computer(‘arch’)

The JRE is at the parent directory of the directory that contains the file "rt.jar". For example, if "rt.jar" is at:

C:\Program Files\Java\jre6\lib\rt.jar

you should set the MATLAB_JAVA environment variable to:

C:\Program Files\Java\jre6

To set MATLAB_JAVA:

1. Click Start

2. Right click Computer and choose Properties

3. Click Advanced System Settings and then click the Environment Variables button.

4. In the system variables section, set (or add) the MATLAB_JAVA system environment variable to the JRE path determined above

This change takes effect on the next launch of MATLAB from an icon, or from a subsequently opened command prompt window.

Verifying the Installation

To verify that MATLAB is using the correct version of the JVM software, type the following at the MATLAB prompt:

>> version -java

If MATLAB is not using your value of MATLAB_JAVA, you may need to logout and log back in again.

Other OS:

To change the JVM MATLAB uses for other systems, use the following links.

Linux:

https://www.mathworks.com/matlabcentral/answers/130360-how-do-i-change-the-java-virtual-machine-jvm-that-matlab-is-using-for-linux

Mac OS:

https://www.mathworks.com/matlabcentral/answers/103056-how-do-i-change-the-java-virtual-machine-jvm-that-matlab-is-using-for-mac-os

MATLAB: How to get back red waitbar

I played around with the java this afternoon and got this to work:

hBar = waitbar ( 0, 'Please Wait....' );
% now use java to get to the progress bar
jFrame = get ( hBar, 'JavaFrame' ); % this will throw a warning
jFigPanel = jFrame.getFigurePanelContainer;
jContainer = jFigPanel.getComponent(0);
jPanel = jContainer.getComponent(0);
%
jProgressContainer = jPanel.getComponent(0);
% get the progress bar
jProgressBar = jProgressContainer.getComponent(0);
% update the progressbar details
jProgressBar.setBackground ( java.awt.Color.RED );
jProgressBar.setString(''); % set the text to be empty
jProgressBar.setStringPainted(true);
% example of progress bar being updated:
for ii=0:0.02:1
  waitbar(ii,hBar)
  pause(0.1)
end

Best Answer

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MATLAB: How to change the Java Virtual Machine (JVM) that MATLAB is using on Windows

MATLAB: How to get back red waitbar

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