From bda45b7b5c9f85a9ab47cb3548f4de27671a2a87 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Mon, 16 Jun 2025 00:21:05 -0400
Subject: [PATCH] add visible handles (not yet functional) to bounding box

---
 src2/mesh/handles.js | 195 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 195 insertions(+)
 create mode 100644 src2/mesh/handles.js

diff --git a/src2/mesh/handles.js b/src2/mesh/handles.js
new file mode 100644
index 00000000..a07a1172
--- /dev/null
+++ b/src2/mesh/handles.js
@@ -0,0 +1,195 @@
+/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
+
+import { THREE } from '../ext/three.js';
+import { broker } from '../moto/broker.js';
+import { space as motoSpace } from '../moto/space.js';
+import { api as meshApi } from './api.js';
+import { util as meshUtil } from './util.js';
+
+const { 
+    BoxGeometry, 
+    EdgesGeometry, 
+    LineSegments, 
+    MeshBasicMaterial, 
+    LineBasicMaterial,
+    Group,
+    Vector3,
+    Quaternion,
+    Mesh
+} = THREE;
+
+class TransformTool {
+    constructor() {
+        this.group = new Group();
+        this.handles = [];
+        this.mode = '2d'; // or '3d'
+        this.bounds = null;
+        this.handleSize = 2; // Fixed size in world units
+        this.handleColor = 0x0088ff;
+        this.handleOpacity = 0.5;
+        this.visible = false;
+        
+        // Create materials
+        this.handleMaterial = new MeshBasicMaterial({
+            color: this.handleColor,
+            transparent: true,
+            opacity: this.handleOpacity
+        });
+        
+        this.edgeMaterial = new LineBasicMaterial({
+            color: this.handleColor,
+            transparent: true,
+            opacity: 0.8
+        });
+
+        // Add to scene
+        motoSpace.world.add(this.group);
+        this.group.visible = false;
+
+        // Listen for selection changes
+        broker.listeners({
+            selection_update: () => this.update(),
+            sketch_selections: () => this.update(),
+            selection_drag: () => this.update(),
+            selection_move: () => this.update(),
+            selection_scale: () => this.update(),
+            selection_rotate: () => this.update(),
+            selection_qrotate: () => this.update(),
+            history_undo: () => this.update(),
+            history_redo: () => this.update(),
+            move: () => this.update(),
+            rotate: () => this.update(),
+            qrotate: () => this.update(),
+            scale: () => this.update(),
+        });
+    }
+
+    show() {
+        this.visible = true;
+        this.group.visible = true;
+    }
+
+    hide() {
+        this.visible = false;
+        this.group.visible = false;
+    }
+
+    update() {
+        // Get current selection
+        const selection = meshApi.selection;
+        const sketch = selection.sketch();
+        const models = selection.models();
+
+        // Hide if no selection
+        if (!sketch && !models.length) {
+            this.hide();
+            return;
+        }
+
+        // Show transform tool
+        this.show();
+
+        // Get bounds based on selection type
+        let bounds;
+        if (sketch) {
+            // For sketches, use 2D mode
+            this.mode = '2d';
+            bounds = {
+                min: new Vector3(
+                    sketch.center.x - sketch.scale.x/2,
+                    sketch.center.y - sketch.scale.y/2,
+                    0
+                ),
+                max: new Vector3(
+                    sketch.center.x + sketch.scale.x/2,
+                    sketch.center.y + sketch.scale.y/2,
+                    0
+                )
+            };
+        } else {
+            // For models/groups, use 3D mode
+            this.mode = '3d';
+            const objects = models;
+            bounds = meshUtil.bounds(objects);
+        }
+
+        this.setBounds(bounds);
+    }
+
+    setBounds(bounds, mode = '3d') {
+        this.mode = mode;
+        this.bounds = bounds;
+        this.updateHandles();
+    }
+
+    updateHandles() {
+        // Clear existing handles
+        this.handles.forEach(handle => this.group.remove(handle));
+        this.handles = [];
+
+        if (!this.bounds) return;
+
+        const { min, max } = this.bounds;
+        const corners = this.getCorners(min, max);
+        
+        // Create handles for each corner
+        corners.forEach(corner => {
+            const handle = this.createHandle();
+            handle.position.copy(corner);
+            this.handles.push(handle);
+            this.group.add(handle);
+        });
+    }
+
+    getCorners(min, max) {
+        if (this.mode === '2d') {
+            // 2D mode - 4 corners in XY plane
+            return [
+                new Vector3(min.x, min.y, 0),
+                new Vector3(max.x, min.y, 0),
+                new Vector3(max.x, max.y, 0),
+                new Vector3(min.x, max.y, 0)
+            ];
+        } else {
+            // 3D mode - 8 corners of bounding box
+            return [
+                new Vector3(min.x, min.y, min.z),
+                new Vector3(max.x, min.y, min.z),
+                new Vector3(max.x, max.y, min.z),
+                new Vector3(min.x, max.y, min.z),
+                new Vector3(min.x, min.y, max.z),
+                new Vector3(max.x, min.y, max.z),
+                new Vector3(max.x, max.y, max.z),
+                new Vector3(min.x, max.y, max.z)
+            ];
+        }
+    }
+
+    createHandle() {
+        // Create a small box for the handle
+        const geometry = new BoxGeometry(
+            this.handleSize,
+            this.handleSize,
+            this.handleSize
+        );
+        
+        // Create the handle mesh
+        const handle = new Mesh(geometry, this.handleMaterial);
+        
+        // Add wireframe edges
+        const edges = new EdgesGeometry(geometry);
+        const line = new LineSegments(edges, this.edgeMaterial);
+        handle.add(line);
+        
+        return handle;
+    }
+
+    get object() {
+        return this.group;
+    }
+}
+
+// Create singleton instance
+const handles = new TransformTool();
+
+export { handles }; 
\ No newline at end of file