Working with non-standard DPI displays

6 Responses

1. 
   Thomas Pieper November 17, 2016 at 14:17 Reply

   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

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

   or

   System.Windows.Forms.SystemInformation.PrimaryMonitorSize

   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]

   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

• 
  Yair Altman November 17, 2016 at 14:47 Reply

  @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 November 24, 2016 at 16:09 Reply

   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

   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

3. 
   Yaroslav November 28, 2016 at 10:59 Reply

   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]);

   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

• 
  marco November 29, 2016 at 16:12 Reply

  Hi,
  maybe this can be helpful:

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

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

  then you can play with ‘pixels’ positions

• 
  Yaroslav November 29, 2016 at 21:28 Reply

  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

  % 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.

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<pre lang="matlab">
a = magic(3);
disp(sum(a))
</pre>

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