From ecfc3032704baeec70551bb366c6ee02f5cf828c Mon Sep 17 00:00:00 2001
From: Viktor Lidholt <viktorl@google.com>
Date: Tue, 16 Feb 2016 18:25:04 -0800
Subject: [PATCH] Correctly calculates gravity in particle systems

---
 packages/flutter_sprites/lib/src/particle_system.dart | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/flutter_sprites/lib/src/particle_system.dart b/packages/flutter_sprites/lib/src/particle_system.dart
index ee40e7f065f..3b8fb40aac3 100644
--- a/packages/flutter_sprites/lib/src/particle_system.dart
+++ b/packages/flutter_sprites/lib/src/particle_system.dart
@@ -252,7 +252,7 @@ class ParticleSystem extends Node {
         particle.dir += accel;
       } else if (gravity[0] != 0.0 || gravity[1] != 0) {
         // gravity
-        Vector2 accel = gravity.scale(dt);
+        Vector2 accel = new Vector2.copy(gravity).scale(dt);
         particle.dir += accel;
       }