CompSci 4 - Classwork - Oct 20, 2005
5 pts

Today's classwork goes along with Chapter 6, Tips and Techniques. You will be using random values and variables.

Create one world with three animals, one animal that can change colors noticeably. (For example, if you change the color of the chicken, it is noticeable. If you try to change the color of the bunny, you don't see the change.) I used cat, chicken and bunny. You may use this or substitute other animals or creatures.

You should write four event handlers. Some may need random values. For some you may need to create a class variable or a variable in a method.

If you have a random value, you should assign it to a variable and print it out so you can see its value when you use it!

1. If you click on the bunny, have it move up one of 5 random amounts. If you click on it a second time, have it move down the same amount, ending up back on the ground. Repeat. (Hint: Save the value somewhere).

2. If you click on the cat, have its head resize twice as large. If you click on it a second time, have its head resize back down to normal size. Repeat.

3. For one animal (in my case the chicken), if you click on the ground have the animal change to one of 5 random colors, one of which is "No Color".
   (Hint: Generate a random number that is not an integer. If the number is in one range (say between 0.0 and 1.0, change it to red. If the number is in a second range, change the color to blue, etc.)

   NOTE: There is a bug in Alice. You cannot create a random integer and then compare its value in an if statement to another integer. Alice treats it as a real number, so it always returns false. You will need to use random real numbers here, not integers!

4. If you click on the chicken, have it resize to one of four larger values. If you click on it a second time, then have it resize back down to its original size. Repeat.

If you finish early, feel free to embelish your animations.