more robustness for projections when coordinates are passed as strings instead of numbers

Author: Fil

src/projection.js

@@ -77,14 +77,18 @@ export function Projection(
     const [[x0, y0], [x1, y1]] = geoPath(projection).bounds(domain);
     const k = Math.min(dx / (x1 - x0), dy / (y1 - y0));
     if (k > 0) {
-      tx -= (k * (x0 + x1) - dx) / 2;
-      ty -= (k * (y0 + y1) - dy) / 2;
-      const {stream: affine} = geoTransform({
-        point(x, y) {
-          this.stream.point(x * k + tx, y * k + ty);
-        }
-      });
-      return {stream: (s) => projection.stream(affine(s))};
+      const cx = (k * (x0 + x1) - dx) / 2;
+      const cy = (k * (y0 + y1) - dy) / 2;
+      if (isFinite(cx + cy)) {
+        tx -= cx;
+        ty -= cy;
+        const {stream: affine} = geoTransform({
+          point(x, y) {
+            this.stream.point(x * k + tx, y * k + ty);
+          }
+        });
+        return {stream: (s) => projection.stream(affine(s))};
+      }
     }
     warn(`The projection could not be fit to the specified domain. Using the default scale.`);
   }