fix centering, poly scaling

src/geo/point.js

@@ -81,6 +81,13 @@ class Point {
         return this;
     }
 
+    scale(x = 1,y = 1,z = 1) {
+        this.x *= x;
+        this.y *= y;
+        this.z *= z;
+        return this;
+    }
+
     round(precision) {
         return newPoint(
             this.x.round(precision),

src/geo/polygon.js

@@ -615,6 +615,7 @@ class Polygon {
      * @returns {Polygon|Point} a new polygon centered on x=0, y=0, z=0
      */
     center(point) {
+        throw "does not work";
         let ap = newPoint(0, 0, 0, null),
             np = newPolygon(),
             pa = this.points;

src/mesh/api.js

@@ -494,11 +494,13 @@ let sketch = {
             sketch.selection.bounded_op((sketch, bounds, recs) => {
                 let center = bounds.center(0);
                 for (let rec of recs) {
-                    rec.poly.move({ x: -center.x, y: -center.y, z:0 });
-                    Object.assign(rec.item, rec.poly.toObject());
+                    let { item } = rec;
+                    let poly = newPolygon().fromObject(item);
+                    poly.move({ x: -center.x, y: -center.y, z:0 });
+                    Object.assign(rec.item, poly.toObject());
                 }
-                selection.centerXY();
                 sketch.render();
+                selection.centerXY();
             });
         },
 

src/mesh/build.js

@@ -8,7 +8,7 @@
 gapp.register("mesh.build", [], (root, exports) => {
 
 const { broker } = gapp;
-const { mesh, moto } = root;
+const { base, mesh, moto } = root;
 const { api, util } = mesh;
 const { space } = moto;
 const { bind, div, label, input, hr } = h;
@@ -873,10 +873,17 @@ function ui_build() {
                 // polygon scaling, circle radius
                 let el2 = bound[`item_val_${axis.toUpperCase()}_size`];
                 if (!el2) continue;
-                sel_item.type !== 'polygon' && el2.classList.add('editable');
+                el2.classList.add('editable');
                 el2.onclick = field_edit(`${axis} size`, (nval, oval) => {
                     if (sel_item.type === 'polygon') {
-                        // todo
+                        let scale = {x:1,y:1,z:1};
+                        let poly = base.newPolygon().fromObject(sel_item);
+                        let bounds = poly.bounds;
+                        scale[axis] = nval/oval;
+                        poly.move(bounds.center().scale(-1,-1,-1));
+                        poly.scale(scale);
+                        poly.move(bounds.center());
+                        Object.assign(sel_item, poly.toObject());
                     } else if (sel_item.type === 'circle') {
                         sel_item.radius = nval / 2;
                     }