diff --git a/lib/box2d/box2d_component.dart b/lib/box2d/box2d_component.dart
index 0ada3997b..c4d18b3e0 100644
--- a/lib/box2d/box2d_component.dart
+++ b/lib/box2d/box2d_component.dart
@@ -140,7 +140,7 @@ abstract class BodyComponent extends Component {
 
     for (int i = 0; i < chainShape.getVertexCount(); ++i) {
       body.getWorldPointToOut(chainShape.getVertex(i), vertices[i]);
-      viewport.getWorldToScreen(vertices[i]);
+      vertices[i] = viewport.getWorldToScreen(vertices[i]);
     }
 
     final List<Offset> points = [];
@@ -159,10 +159,10 @@ abstract class BodyComponent extends Component {
   }
 
   void _renderCircle(Canvas canvas, Fixture fixture) {
-    final Vector2 center = Vector2.zero();
+    var center = Vector2.zero();
     final CircleShape circle = fixture.getShape();
     body.getWorldPointToOut(circle.p, center);
-    viewport.getWorldToScreen(center);
+    center = viewport.getWorldToScreen(center);
     renderCircle(
         canvas, Offset(center.x, center.y), circle.radius * viewport.scale);
   }
@@ -180,7 +180,7 @@ abstract class BodyComponent extends Component {
 
     for (int i = 0; i < polygon.count; ++i) {
       body.getWorldPointToOut(polygon.vertices[i], vertices[i]);
-      viewport.getWorldToScreen(vertices[i]);
+      vertices[i] = viewport.getWorldToScreen(vertices[i]);
     }
 
     final List<Offset> points = [];
diff --git a/lib/box2d/viewport.dart b/lib/box2d/viewport.dart
index 0f85f4a02..334240dc3 100644
--- a/lib/box2d/viewport.dart
+++ b/lib/box2d/viewport.dart
@@ -58,8 +58,8 @@ class Viewport extends ViewportTransform {
     double y = center.y;
 
     if (horizontal != null) {
-      final Vector2 temp = Vector2.zero();
-      getWorldToScreen(position);
+      var temp = Vector2.zero();
+      temp = getWorldToScreen(position);
 
       final margin = horizontal / 2 * size.width / 2;
       final focus = size.width / 2 - temp.x;
@@ -72,8 +72,8 @@ class Viewport extends ViewportTransform {
     }
 
     if (vertical != null) {
-      final Vector2 temp = Vector2.zero();
-      getWorldToScreen(position);
+      var temp = Vector2.zero();
+      temp = getWorldToScreen(position);
 
       final margin = vertical / 2 * size.height / 2;
       final focus = size.height / 2 - temp.y;