feat: Add an icon for the GUI application (#1179)

* Test run of application icons.

These icons are not final, but meant as a test of the packaging platform.

* Try adding an in-app icon.

* Actually add the image.

* Add defensive null check.

* Update Mac OS icon.

* Add the application icon SVG source.

* Add a helper script for Mac icon creation.

* Update Windows icon + add conversion script.

* Update Mac OS icon.

* Update core icon with better background transparency.

* Update Windows icon, including more intermediate resolutions in the ico file.

* Support different resolution icons within the app JFrame.

* Support JFrame app icon in multiple resolutions.

* Fix typo.

* Add README and script updates.

* Java format.

* Add the --win-console option back in.

Co-authored-by: Brian Ferris <[email protected]>

Author: bdferris-v2

app/gui/src/main/java/org/mobilitydata/gtfsvalidator/app/gui/GtfsValidatorApp.java

@@ -23,13 +23,17 @@
 import java.awt.Font;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
+import java.awt.Image;
+import java.awt.Toolkit;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.io.File;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.net.URL;
 import java.nio.file.Path;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.ResourceBundle;
 import javax.swing.BorderFactory;
@@ -134,6 +138,7 @@ public void showNewVersionAvailable() {
 
   void constructUI() {
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    setApplicationIcon();
 
     JPanel panel = new JPanel();
     panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
@@ -155,6 +160,25 @@ void constructUI() {
     }
   }
 
+  private void setApplicationIcon() {
+    Toolkit toolkit = Toolkit.getDefaultToolkit();
+    List<String> iconFileNames =
+        Arrays.asList("icon_16x16.png", "icon_32x32.png", "icon_48x48.png");
+    List<Image> iconImages = new ArrayList<>();
+    for (String iconFileName : iconFileNames) {
+      URL resource = getClass().getResource(iconFileName);
+      if (resource != null) {
+        Image image = toolkit.createImage(resource);
+        iconImages.add(image);
+      } else {
+        logger.atWarning().log("Icon image not found: %s", iconFileName);
+      }
+    }
+    if (!iconImages.isEmpty()) {
+      setIconImages(iconImages);
+    }
+  }
+
   private void constructGtfsInputSection(JPanel parent) {
     // GTFS Input Section
     parent.add(createLabelWithFont(bundle.getString("gtfs_input"), BOLD_FONT));

app/gui/src/main/resources/org/mobilitydata/gtfsvalidator/app/gui/icon_16x16.png

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import org.gradle.internal.os.OperatingSystem
+
 plugins {
     id 'java'
     id "de.jjohannes.extra-java-module-info" version "0.11"
@@ -96,9 +98,16 @@ jlink {
         // Some platforms (e.g. Mac OS) need a pure x.y.z version number.
         // So strip any -SNAPSHOT suffix if present.
         appVersion = project.version.toString().replace('-SNAPSHOT', '')
-        if (org.gradle.internal.os.OperatingSystem.current().windows) {
+        if (OperatingSystem.current().isWindows()) {
             installerOptions += ['--win-per-user-install', '--win-dir-chooser', '--win-menu', '--win-shortcut']
-            imageOptions += ['--win-console']
+            imageOptions = [
+                    '--icon', "${projectDir}/src/main/icons/Icon.ico", '--win-console'
+            ]
+        }
+        if (OperatingSystem.current().isMacOsX()) {
+            imageOptions = [
+                    '--icon', "${projectDir}/src/main/icons/Icon.icns"
+            ]
         }
     }
 }

app/gui/src/main/resources/org/mobilitydata/gtfsvalidator/app/gui/icon_32x32.png

@@ -0,0 +1,15 @@
+## Updating Application Icons
+
+The source file for all application icons is `Icon.svg`.  This is used to create three
+platform-specific application icons:
+
+* Windows: `Icon.ico`
+* Mac OS: `Icon.icns`
+* Java In-App
+
+When updating the source icon, you can run the following three scripts to regenerate the
+relevant icon files from the SVG source:
+
+* `svg2ico.sh`
+* `svg2icsn.sh`
+* `svg2jframe_icons.sh`

app/gui/src/main/resources/org/mobilitydata/gtfsvalidator/app/gui/icon_48x48.png

@@ -0,0 +1,39 @@
+#!/bin/bash
+#
+# Helper script for constructing a Mac OS icns icon bundle,
+# from an intermediate iconset file bundle.  Requires install
+# of ImageMagik for `convert` command.
+
+set -e
+
+BASEDIR=$(dirname "$0")
+SVG=$BASEDIR/Icon.svg
+ICONSET_DIR=$BASEDIR/Icon.iconset
+
+CONFIGS="
+icon_16x16.png,16x16
+[email protected],32x32
+icon_32x32.png,32x32
+[email protected],64x64
+icon_128x128.png,128x128
+[email protected],256x256
+icon_256x256.png,256x256
+[email protected],512x512
+icon_512x512.png,512x512
+[email protected],1024x1024
+"
+
+if [ -e $ICONSET_DIR ]; then
+  rm -rf "$ICONSET_DIR"
+fi
+mkdir $ICONSET_DIR
+
+for CONFIG in $CONFIGS; do
+  FILENAME=$(echo $CONFIG | cut -d, -f1)
+  SIZE=$(echo $CONFIG | cut -d, -f2)
+  echo $FILENAME
+  convert -density 1200 -background none -resize $SIZE $SVG $ICONSET_DIR/$FILENAME
+done
+
+iconutil -c icns $ICONSET_DIR
+rm -rf "$ICONSET_DIR"