6.3A Zoo Assignment

Make animals hungry using a timer

Acceptance Criteria

Acceptance criteria

The hunger timer advances the animal through the required hunger states and changes its behavior.

1.Make animals hungry using a timer

Problem

Solution

Sequence Diagram: Hunger Delegate. Reference figure for make animals hungry using a timer. — Sequence Diagram: Hunger Delegate

A Make animals hungry on a timer.

1 Make changes as specified in the class diagram below. Create the HungerState enum in the CagedItems project.

Class Diagram: Hunger Timer. Reference figure for make animals hungry using a timer. — Class Diagram: Hunger Timer

2 In the CreateTimers methods, instantiate and start the hungerTimer, set the interval to a random time between 10 and 20 seconds, plug the HandleHungerStateChange in to the timer's Elapsed event and Start the timer.

new Timer(random.Next(10, 21) * 1000);

3 In the HandleHungerStateChange method, change the animal's hunger state to the next hunger state each time the timer hits it.

The Tired state should not change to anything else.

B Effect how hungry animals move.

1 In the Animal constructor, assign the HungerState to Satisfied as a starting point.

2 Within the MoveHelper's MoveVertically and MoveHorizontally methods, implement the following movement changes based on the animal's hunger state.

Subtasks

A. Satisfied animals move normally.
B. Hungry animals move at 1/4 the normal rate.
C. Starving and tired animals do not move.

C Affect how tired animals are drawn.

1 In the CageWindow.xaml.cs DrawItem method, create a transform group; create the transform group before the if-statement where the item's direction is determined.

TransformGroup transformGroup = new TransformGroup();

How to Apply Multiple Transforms on an Object

2 Skew and scale the tired animal (representing it laying down).

Subtasks

A. Create an if-statement checking if the item's HungerState is tired.
B. In the if statement, use a SkewTransform to skew the item (animal) at a 30-degree angle.
B.1. Create a new SkewTransform and set its AngleX to 30 degrees in the direction the cageable is facing.

SkewTransform tiredSkew = new SkewTransform();
tiredSkew.AngleX = item.XDirection == HorizontalDirection.Left ? 30.0 : -30.0;

Subtasks

B.2. Add the SkewTransform to the transform group.

transformGroup.Children.Add(tiredSkew);

Subtasks

C. In the if statement, use a ScaleTransform to make the animal appear smaller by 75% of its width and 50% of its height.

transformGroup.Children.Add(new ScaleTransform(0.75, 0.5));

3 Apply the transform to the view box.

Subtasks

A. In the if statement that checks the position of the item, remove the line of code that assigns the viewBox's RenderTransform property and instead Add the flipTransform to the transformGroup's Children.
B. After the if statements, apply the transform by assigning the viewBox's RenderTransform property to the transformGroup object.

viewBox.RenderTransform = transformGroup;

D Check your work

1 Run the WPF application. Create an animal.

2 Show the animal's cage.

If the animal is satisfied, it will move normally; if the animal is hungry, it will move as 1/4 the normal speed; if the animal is starving, it will not move; if the animal is tired, it will tip over. The movement will then stop.

Have the guest feed their adopted animal automatically.

Acceptance Criteria

Acceptance criteria

Guests automatically feed their adopted animals in response to hunger notifications.

2.Have the guest feed their adopted animal automatically.

Problem

Solution

Sequence Diagram: Hunger. Reference figure for have the guest feed their adopted animal automatically. — Sequence Diagram: Hunger

A Make changes as specified in the class diagram below.

Class Diagram: Hunger State. Reference figure for have the guest feed their adopted animal automatically. — Class Diagram: Hunger State

B Call the OnHunger action in the HandleHungerStateChange method when the HungerState is changed to tired.

C The guest's feedTimer will be used to delay the automatic feeding by five seconds.

1 In the CreateTimers method: instantiate the feedTimer to be 5 seconds long and plug in the HandleReadyToFeed method into the Elapsed property.

2 Call CreateTimers in OnDeserialized and in the guest constructor.

3 Add the [OnDeserialized] attribute to the OnDeSerialized method.

D Right now we can't "revive" the animal and have the hungerTimer restart so let's make that happen by modifying the Animal's Eat method

1 After the call to Eat, Stop the hungerTimer.

2 Assign the animal's HungerState to Satisfied.

3 Start the hungerTimer.

E Have the guest "subscribe" to their adopted animal's hunger change. In the AdoptedAnimal property

1 If the adopted animal exists, assign its OnHunger delegate to null.

2 Assign the adoptedAnimal to the value passed in.

3 If the adoptedAnimal exists, plug in the HandleAnimalHungry method to the OnHunger delegate.

F In the HandleAnimalHungry method, start the feedTimer.

G In the HandleReadyToFeed method

1 Have the guest feed their adoptedAnimal and pass in a new VendingMachine object.

2 Stop the feedTimer.

H Handle the threading issues.

6.3.1 How to Use the Dispatcher

1 In the MainWindow, surround the code that updates the guestListBox in a Dispatcher

this.Dispatcher.Invoke(() =>
{
    this.guestListBox.Items.RemoveAt(index);

    this.guestListBox.Items.Insert(index, guest);

    this.guestListBox.SelectedItem = this.guestListBox.Items[index];
});

2 Do the same thing for UpdateAnimalDisplay.

Below is the basic structure of a Dispatcher Invoke. The code that needs to be executed goes in the curly braces.

this.Dispatcher.Invoke(() => { });

I Check your work

1 Run the application and create an animal and a guest.

2 Show the animal cage and wait until the animal is tired and lays down.

3 Select your guest and your animal and click FeedAnimal. The animal should go back to normal and begin moving again.

4 Have your guest adopt the animal.

5 Wait until the animal is tired and lays down again.

This time, wait 5 seconds and the animal should automatically go back to normal and start moving again.

Provide a vending machine to guests for feeding animals.

Acceptance Criteria

Acceptance criteria

A Func delegate gives the feeding guest access to the vending machine.

Demonstrate your work

4.Record a video showing

A Your WPF Application

1 Step 2I - Check Your Work

Prepare and submit your work

5.Submission Steps

A Ensure that your application has no compiler errors or warnings

B Ensure that your code is StyleCop compliant

C Remove all bin and obj folders from your solution

D Zip your solution

E Submit your zipped solution to the Feedback System

F Submit your Feedback System results link to Canvas

G Submit your video recording to your f-channel

Source credit