toolbar block icons centred in their 16px box (test for all icons), tutorials say where the objects tab is

src/main/java/com/eliasmueller/llamamod/editor/tools/geometry/GeoIcons.java

@@ -19,8 +19,8 @@ final class GeoIcons {
     private static final Color RED = new Color(0xD93F3F);
 
     static void register() {
-        Icons.register("prim-box", (g, fg) -> block(g, 2, 5, 12, 8, TOP, SIDE));
-        Icons.register("prim-platform", (g, fg) -> block(g, 1, 4, 14, 4, TOP, SIDE));
+        Icons.register("prim-box", (g, fg) -> block(g, 2, 1, 12, 8, TOP, SIDE));
+        Icons.register("prim-platform", (g, fg) -> block(g, 1, 2.5, 14, 4, TOP, SIDE));
         Icons.register("prim-floor", (g, fg) -> {
             Path2D p = poly(1, 10, 8, 6.5, 15, 10, 8, 13.5);
             g.setColor(TOP);
@@ -47,7 +47,7 @@ final class GeoIcons {
             g.setColor(fg);
             g.draw(p);
         });
-        Icons.register("prim-pillar", (g, fg) -> block(g, 5, 2, 6, 12, STONE, STONE.darker()));
+        Icons.register("prim-pillar", (g, fg) -> block(g, 5, 0.5, 6, 12, STONE, STONE.darker()));
         Icons.register("prim-cylinder", (g, fg) -> {
             g.setColor(STONE.darker());
             g.fill(new java.awt.geom.Rectangle2D.Double(2, 6, 12, 5));
@@ -122,7 +122,7 @@ final class GeoIcons {
         Icons.register("prim-invbox", (g, fg) -> {
             g.setStroke(
                     new BasicStroke(1.2f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 1, new float[] {2, 1.5f}, 0));
-            outlineBlock(g, 2, 5, 12, 8, new Color(255, 60, 60, 60), RED);
+            outlineBlock(g, 2, 1, 12, 8, new Color(255, 60, 60, 60), RED);
         });
         Icons.register("geo-collision", (g, fg) -> {
             Path2D p = poly(1, 10, 8, 6.5, 15, 10, 8, 13.5);
@@ -221,6 +221,7 @@ final class GeoIcons {
     }
 
     /** Isometric block: x, y of the top-left, width w, side height h. */
+    /** An isometric block filling y .. y + w / 2 + h; keep that within the 16 × 16 icon box. */
     private static void block(Graphics2D g, double x, double y, double w, double h, Color top, Color side) {
         Color fg = g.getColor();
         double d = w / 4;

src/main/java/com/eliasmueller/llamamod/editor/ui/Icons.java

@@ -40,6 +40,11 @@ public final class Icons {
 
     private Icons() {}
 
+    /** Names of all registered icons (sorted). */
+    public static java.util.List<String> names() {
+        return PAINTERS.keySet().stream().sorted().toList();
+    }
+
     public static void register(String name, Painter p) {
         PAINTERS.put(name, p);
         CACHE.keySet().removeIf(k -> k.startsWith(name + "@"));