Working with non-standard DPI displays

6 Responses to Working with non-standard DPI displays

1. Thomas Pieper says:

   November 17, 2016 at 2:17 pm

   If you feel more as a Microsoft family member you might want to use .NET commands. Try

   NET.addAssembly('System.Windows.Forms');
   System.Windows.Forms.Screen.PrimaryScreen.Bounds

   or

   System.Windows.Forms.SystemInformation.PrimaryMonitorSize

   and you get something like

   ans = 
    
     System.Drawing.Rectangle
     Package: System.Drawing
    
     Properties:
       Location: [1x1 System.Drawing.Point]
           Size: [1x1 System.Drawing.Size]
              X: 0
              Y: 0
          Width: 1920
         Height: 1080
           Left: 0
            Top: 0
          Right: 1920
         Bottom: 1080
        IsEmpty: 0
          Empty: [1x1 System.Drawing.Rectangle]

   Greetings,

   Thomas

   Reply
   • Yair Altman says:

     November 17, 2016 at 2:47 pm

     @Thomas – the problem with your .NET solution is that it only works on Windows; the Java-based solution in my post works on all Matlab platforms, including Mac and Linux.
2. Matthias Kirchhoff says:

   November 24, 2016 at 4:09 pm

   As for me the solution using java.awt.Toolkit.getDefaultToolkit.getScreenSize does not work correctly when using more than one monitor.
   Better use:

   ge = javaObjectEDT(java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment());
   gs = ge.getScreenDevices();
   jmonitorposition = [];
   if ~isempty(gs)
     for iRun_ = 1:size(gs,1)
        dm = gs(iRun_).getDisplayMode();
        jmonitorposition(iRun_,:) = [1 1 dm.getWidth dm.getHeight];
     end
   end

   Best regards
   Matthias

   Reply
3. Yaroslav says:

   November 28, 2016 at 10:59 am

   Hi Yair,

   Suppose I have two monitors. How can I tell a figure to appear on the secondary one, if it exists? I can do something like

   hFig = figure('Units','normalized','Position',[1.10 0.10 0.80 0.70]);

   but it doesn’t tell me whether the second screen exists or not (if not, it will effectively hide the figure).

   Best regards

   Reply
   • marco says:

     November 29, 2016 at 4:12 pm

     Hi,
     maybe this can be helpful:

     >> monitorPos = get(0,'MonitorPositions')
     monitorPos =
                1           1        1600         900
             1601           1        3200         900

     then you can play with ‘pixels’ positions
   • Yaroslav says:

     November 29, 2016 at 9:28 pm

     Hi @Marco,

     Thank you for your comment. Unfortunately, your solution tells me only how many monitors I can have. What I need is to know how many monitors I currently have.

     To be more precise, MonitorPositions tells me how many monitors I had at the time of Matlab’s startup. It does not change if I attach a monitor after startup. This is the behaviour in my Windows 8.1 laptop.

     I can do a little trick to circumvent this problem. By using the PointerLocation, I can check on which monitor the pointer is. For example

     % get root handle
     hRoot = groot;
     % check if (a) there are at least two monitors
     %          (b) pointer's x location is larger than 2nd monitor's x0 position
     if     size(hRoot.MonitorPositions,1) >= 2 ...
         && hRoot.PointerLocation(1) > hRoot.MonitorPositions(2,1)
         % put figure on the second monitor
     else
         % put figure on the first monitor
     end

     However, as you can see, it assumes you have control over the cursor’s position during execution. I wish there was an option to tell how many active monitors are there.