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Grammar PRaiser: Fixes for src/content/cookbook/animation/physics-simulation.md #5

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Grammar PRaiser: Fixes for src/content/cookbook/animation/physics-simulation.md #5

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15 changes: 4 additions & 11 deletions src/content/cookbook/animation/physics-simulation.md
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ This recipe uses these steps:

## Step 1: Set up an animation controller

Start with a stateful widget called `DraggableCard`:
Start with a stateful widget called `DraggableCard`.

<?code-excerpt "lib/starter.dart"?>
```dart
Expand Down Expand Up @@ -74,10 +74,7 @@ class _DraggableCardState extends State<DraggableCard> {
}
```

Make the `_DraggableCardState` class extend from
[SingleTickerProviderStateMixin][].
Then construct an [AnimationController][] in
`initState` and set `vsync` to `this`.
Make the `_DraggableCardState` class extend [SingleTickerProviderStateMixin][]. Then construct an [AnimationController][] in `initState` and set `vsync` to `this`.

:::note
Extending `SingleTickerProviderStateMixin` allows the state object to be a
Expand Down Expand Up @@ -225,10 +222,7 @@ Finally, update the `GestureDetector` to manage the animation controller:

## Step 4: Calculate the velocity to simulate a springing motion

The last step is to do a little math, to calculate the velocity of the widget
after it's finished being dragged. This is so that the widget realistically
continues at that speed before being snapped back. (The `_runAnimation` method
already sets the direction by setting the animation's start and end alignment.)
The last step is to perform a calculation to determine the velocity of the widget after it finishes being dragged. This allows the widget to realistically continue moving at that speed before being snapped back. (The `_runAnimation` method already sets the direction by setting the animation's start and end alignment.)

First, import the `physics` package:

Expand Down Expand Up @@ -279,8 +273,7 @@ onPanEnd: (details) {
```

:::note
Now that the animation controller uses a simulation it's `duration` argument
is no longer required.
Now that the animation controller uses a simulation, its `duration` argument is no longer required.
:::

## Interactive Example
Expand Down