HiDPI support for Linux

Question

I had trouble installing this on Linux, where I had desktop scaling set to 200% (in Retina parlance, a "Looks like 1920x1080" mode on a 4K monitor). The installer opened a window that was too small to see its content. Specifically the button to accept the T&Cs was out of the viewport, and the window could not be scrolled or resized to include it.

The same applies when the application is then run. It takes no notice of desktop scale, and thus the user interface elements are far too small to use on a high resolution monitor.

Tested: current version (3.18.1) with included Java 10, on Ubuntu 18.04, in Gnome.

BTW JAR-only version with OpenJDK 10.0.2+13 failed with missing stuff:

Exception in thread "main" java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper

Answer 1

Java applications can be scaled per-application. Edit the execution script:

nano ~/yEd/yEd

The top few lines are:

#!/bin/sh

# Uncomment the following line to override the JVM search sequence

# INSTALL4J_JAVA_HOME_OVERRIDE=

# Uncomment the following line to add additional VM parameters

# INSTALL4J_ADD_VM_PARAMS=

 

Add the following (the comment was for my benefit):

 

# 2019-Nov-28 AM: Additional parameters for High DPI scaling

INSTALL4J_ADD_VM_PARAMS=-Dsun.java2d.uiScale=2.0

 

Play around with the scaling until you like it. I found 2.0 (200%) quite good.

 

This was tested on 3.19 and 3.19.1.1 (full install) running on Ubuntu 19.04 and 19.10.