radius constraint

web/app/sketcher/actions/constraintActions.js

@@ -263,6 +263,38 @@ export default [
     }
   },
 
+  {
+    id: 'RadiusLength',
+    shortName: 'RadiusLength',
+    description: 'Radius Length',
+    selectionMatcher: (selection) => {
+      for (let obj of selection) {
+        if (!(isInstanceOf(obj, Circle) || isInstanceOf(obj, Arc))) {
+          return false;
+        }
+      }
+      return true;
+    },
+
+    invoke: ctx => {
+      const {viewer} = ctx;
+
+      const [firstCircle, ...others] = viewer.selected;
+
+      const firstConstr = new AlgNumConstraint(ConstraintDefinitions.RadiusLength, [firstCircle]);
+      firstConstr.initConstants();
+
+      editConstraint(ctx, firstConstr, () => {
+        const pm = viewer.parametricManager;
+        pm._add(firstConstr);
+        for (let other of others) {
+          pm._add(new AlgNumConstraint(ConstraintDefinitions.RadiusLength, [other], {...firstConstr.constants}));
+        }
+        pm.commit();
+      });
+    }
+  },
+
   {
     id: 'DistancePL',
     shortName: 'Point to Line Distance',

web/app/sketcher/constr/ANConstraints.js

@@ -369,6 +369,29 @@ export const ConstraintDefinitions = {
     }
   },
 
+
+  RadiusLength: {
+    id: 'RaduisLength',
+    name: 'Raduis Length',
+    constants: {
+      length: {
+        type: 'number',
+        description: 'length of the raduis',
+        initialValue: ([c]) => {
+          return c.r.get();
+        },
+      },
+    },
+    defineParamsScope: ([c], callback) => {
+      callback(c.r);
+    },
+
+    collectPolynomials: (polynomials, [r], {length}) => {
+      polynomials.push(new Polynomial(-length).monomial(1).term(r, POW_1_FN));
+    },
+
+  },
+
   Polar: {
     id: 'Polar',
     name: 'Polar Coordinate',