From 5f001f30502da5bd24210fe3bee2ff07f565df05 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Thu, 25 Jul 2024 16:03:51 -0400
Subject: [PATCH] add sketch poly group and ungroup

---
 src/mesh/build.js  |  4 ++--
 src/mesh/sketch.js | 23 +++++++++++++++++++++--
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/mesh/build.js b/src/mesh/build.js
index 964a9a82..828cb2e9 100644
--- a/src/mesh/build.js
+++ b/src/mesh/build.js
@@ -433,8 +433,8 @@ function ui_build() {
                 h.button({ _: 'intersect', onclick: sketch.boolean.intersect }),
                 h.button({ _: 'difference', onclick: sketch.boolean.difference }),
                 h.hr(),
-                h.button({ _: 'group', onclick: sketch.boolean.union }),
-                h.button({ _: 'ungroup', onclick: sketch.boolean.union }),
+                h.button({ _: 'group', onclick: sketch.boolean.group }),
+                h.button({ _: 'ungroup', onclick: sketch.boolean.ungroup }),
             ])
         ]),
         h.div({ class: "sketch-off" }, [
diff --git a/src/mesh/sketch.js b/src/mesh/sketch.js
index fc1a5d66..7a86a7d5 100644
--- a/src/mesh/sketch.js
+++ b/src/mesh/sketch.js
@@ -170,11 +170,30 @@ mesh.sketch = class MeshSketch extends mesh.object {
                 let items = sketch.selection.mesh_items();
                 let polys = items.map(i => i.sketch_item.poly);
                 let union = POLYS.union(polys, 0, true);
-                console.log('sketch union', union);
                 sketch.selection.delete();
                 for (let poly of union) {
                     sketch.add_polygon({ poly });
                 }
+            },
+
+            group() {
+                let items = sketch.selection.mesh_items();
+                let polys = items.map(i => i.sketch_item.poly).clone(true);
+                let union = POLYS.nest(POLYS.flatten(polys, [], true));
+                sketch.selection.delete();
+                for (let poly of union) {
+                    sketch.add_polygon({ poly });
+                }
+            },
+
+            ungroup() {
+                let items = sketch.selection.mesh_items();
+                let polys = items.map(i => i.sketch_item.poly).clone(true);
+                let flat = POLYS.flatten(polys, [], true);
+                sketch.selection.delete();
+                for (let poly of flat) {
+                    sketch.add_polygon({ poly });
+                }
             }
         }
     }
@@ -287,7 +306,7 @@ mesh.sketch = class MeshSketch extends mesh.object {
     }
 
     add_polygon(opt = {}) {
-        log(this.file || this.id, '| add polygon');
+        // log(this.file || this.id, '| add polygon');
         Object.assign(opt, { center: {x:0, y:0, z:0} }, opt);
         this.items.push({ type: "polygon", ...opt, ...opt.poly.toObject() });
         this.render();