Check in 2.4

build.xml

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+<?xml version="1.0"?>
+
+<project name="DisplayModeIcons" default="dist" basedir=".">
+
+  <!-- set global properties for this build -->
+  <property name="aoilocation" value=".." />
+  <property name="src" value="./src" />
+  <property name="build" value="./build" />
+  <property name="docs" value="./docs" />
+  <property name="dist" value="${aoilocation}/Plugins" />
+  <property name="aoijar" value="${aoilocation}/ArtOfIllusion.jar" />
+
+  <target name="init">
+    <!-- Create the time stamp -->
+    <tstamp/>
+    <!-- Create the build directory structure used by compile -->
+    <mkdir dir="${build}" />
+    <!-- Create the docs directory structure used by documentation -->
+    <mkdir dir="${docs}" />
+  </target>
+
+  <target name="compile" depends="init">
+    <!-- Compile the java code from ${src} into ${build} -->
+    <javac source="1.6" target="1.6" srcdir="${src}" destdir="${build}" classpath="${aoijar}:${mtjjar}" debug="on" extdirs="" includeantruntime="false"/>
+  </target>
+
+  <target name="dist" depends="compile">
+    <!-- Copy all necessary files into ${build}, then create the jar file -->
+    <copy file="${src}/extensions.xml" todir="${build}" />
+    <copy todir="${build}">
+      <fileset dir="${src}" includes="**/*.properties" />
+    </copy>
+     <copy todir="${build}/displaymodeicons">
+      <fileset dir="${src}/artofillusion/displaymodeicons/Icons" />
+    </copy>
+    <jar jarfile="${dist}/DisplayModeIcons.jar" basedir="${build}" />
+  </target>
+
+  <target name="docs" depends="init">
+    <javadoc packagenames="artofillusion.*"
+        sourcepath="${src}"
+        classpath="${aoijar}"
+        defaultexcludes="yes"
+        destdir="${docs}"
+        author="true"
+        version="true"
+        use="true"
+        windowtitle="Display Mode Icons Documentation"
+        public="true">
+      <doctitle><![CDATA[<h1>Display Mode Icons</h1>]]></doctitle>
+      <bottom><![CDATA[<i>Copyright &#169; 2007 by Francois Guillet. Copyright &#169; 2015-2023 by Petri Ihalainen.</i>]]></bottom>
+    </javadoc>
+  </target>
+
+  <target name="clean">
+    <!-- Delete the ${build} and ${docs} directory trees -->
+    <delete dir="${build}" />
+    <delete dir="${docs}" />
+  </target>
+</project>
+

src/artofillusion/displaymodeicons/AlignToAxesControl.java

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+/*
+ *  Copyright (C) 2019 - 2023 Petri Ihalainen
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the
+ *  terms of the GNU General Public License as published by the Free Software
+ *  Foundation; either version 2 of the License, or (at your option) any later version.
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ *  PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ */
+
+package artofillusion.displaymodeicons;
+
+import java.awt.Dimension;
+import java.awt.Insets;
+
+import buoy.event.*;
+import buoy.widget.*;
+import artofillusion.ViewerCanvas;
+import artofillusion.math.*;
+import artofillusion.ui.*;
+import artofillusion.view.*;
+
+public class AlignToAxesControl implements ViewerControl
+{
+  public Widget createWidget(ViewerCanvas view) 
+  {
+    return new AlignToAxesControlWidget(view);
+  }
+
+  public String getName() 
+  {
+    return ("Align with axes button");
+  }
+
+  public class AlignToAxesControlWidget extends RowContainer
+  {
+    private ViewerCanvas view;
+    private Vec3 up, fw;
+    private short upZeros, fwZeros;
+    private BLabel buttonLabel = new BLabel(ThemeManager.getIcon("displaymodeicons:align"));
+    public  AlignToAxesControlWidget(ViewerCanvas view)
+    {
+      super();
+      this.view = view;
+      buttonLabel.addEventLink(MouseReleasedEvent.class, this, "buttonPressed");
+      buttonLabel.addEventLink(ToolTipEvent.class,       this, "showToolTip");
+      view.addEventLink(ViewChangedEvent.class, this, "viewChanged");
+      setDefaultLayout(new LayoutInfo(LayoutInfo.CENTER, LayoutInfo.NONE, new Insets(0, 0, 0, 0), new Dimension(0,0)));
+      add(buttonLabel);
+      viewChanged();
+    }
+
+    private void viewChanged()
+    {
+      if (viewIsAligned())
+        buttonLabel.setIcon(ThemeManager.getIcon("displaymodeicons:is_aligned"));
+      else
+        buttonLabel.setIcon(ThemeManager.getIcon("displaymodeicons:not_aligned"));
+    }
+
+    private void buttonPressed()
+    {
+      // At start up ViewAnimation is still null. Therefore getting it here every time.
+
+      ViewAnimation a = view.getViewAnimation();
+      if (a == null || a.animatingMove() || a.changingPerspective())
+        return;
+      buttonLabel.setIcon(ThemeManager.getIcon("displaymodeicons:align_disabled"));
+      view.alignWithClosestAxis();
+    }
+
+    private boolean viewIsAligned()
+    {
+      up = view.getCamera().getCameraCoordinates().getUpDirection();
+      fw = view.getCamera().getCameraCoordinates().getZDirection();
+      upZeros = 0;
+      if (up.x == 0) upZeros++;
+      if (up.y == 0) upZeros++;
+      if (up.z == 0) upZeros++;
+      fwZeros = 0;
+      if (fw.x == 0) fwZeros++;
+      if (fw.y == 0) fwZeros++;
+      if (fw.z == 0) fwZeros++;
+
+      if (upZeros > 1 && fwZeros > 1)
+        return true;
+      return false;
+    }
+
+    private void showToolTip(ToolTipEvent e)
+    {
+        new BToolTip(Translate.text("displaymodeicons:alignment")).processEvent(e);
+    }
+  }
+}

src/artofillusion/displaymodeicons/AxesViewerControl.java

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+/*
+ *  Copyright (C) 2007 François Guillet
+ *  Changes copyright (C) 2023 Petri Ihalainen
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the
+ *  terms of the GNU General Public License as published by the Free Software
+ *  Foundation; either version 2 of the License, or (at your option) any later version.
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ *  PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ */
+
+package artofillusion.displaymodeicons;
+
+import java.awt.Dimension;
+import java.awt.Insets;
+
+import buoy.event.ValueChangedEvent;
+import buoy.event.ToolTipEvent;
+import buoy.widget.BToolTip;
+import buoy.widget.LayoutInfo;
+import buoy.widget.RowContainer;
+import buoy.widget.Widget;
+import artofillusion.ViewerCanvas;
+import artofillusion.ui.ThemeManager;
+import artofillusion.ui.ToolButtonWidget;
+import artofillusion.ui.Translate;
+import artofillusion.view.ViewChangedEvent;
+import artofillusion.view.ViewerControl;
+
+public class AxesViewerControl implements ViewerControl
+{
+  public Widget createWidget(ViewerCanvas canvas) 
+  {
+    return new AxesViewerControlWidget(canvas);
+  }
+
+  public String getName() 
+  {
+    return ("Axes Toggle Button");
+  }
+
+  public class AxesViewerControlWidget extends RowContainer
+  {
+    private ViewerCanvas canvas;
+    private ToolButtonWidget button;
+
+    public AxesViewerControlWidget(ViewerCanvas canvas)
+    {
+      super();
+      this.canvas = canvas;
+      canvas.addEventLink(ViewChangedEvent.class, this, "viewCanged");
+      button = new ToolButtonWidget(ThemeManager.getToolButton(this, "displaymodeicons:axis"));
+      button.addEventLink(ValueChangedEvent.class, this, "buttonPressed");
+      button.addEventLink(ToolTipEvent.class,      this, "showToolTip");
+      setDefaultLayout(new LayoutInfo(LayoutInfo.CENTER, LayoutInfo.NONE, new Insets(0, 0, 0, 0), new Dimension(0,0)));
+      add(button);
+      viewCanged();
+    }
+
+    private void viewCanged()
+    {
+      button.setSelected(canvas.getShowAxes());
+    }
+
+    private void buttonPressed()
+    {
+      canvas.setShowAxes(button.isSelected());
+      canvas.repaint();
+    }
+
+    private void showToolTip(ToolTipEvent e)
+    {
+      if (canvas.getShowAxes())
+        new BToolTip(Translate.text("displaymodeicons:hideAxes")).processEvent(e);
+      else
+        new BToolTip(Translate.text("displaymodeicons:showAxes")).processEvent(e);
+    }
+
+  }
+}