The Essentials of Alice Mrs. Jayne Slease SBMS CTE Computer Science and Animation Credit to Duke Students under the direction of Professor Susan Rodger.

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Presentation transcript:

The Essentials of Alice Mrs. Jayne Slease SBMS CTE Computer Science and Animation Credit to Duke Students under the direction of Professor Susan Rodger Duke University May 2009

This tutorial will teach you how to create a short animation in an Alice world. Follow the steps and use the pictures to help find things on your screen. When you open Alice, the first thing you must do is choose a background for your animation. You have six choices. Select the templates tab to see the background choices. For this tutorial, choose the sand background, and then click Open. Step 1: Choosing a BackgroundStep 2: Adding an Object Next, you will add an object. The object will be the main character in your Alice animation. Click on the green Add Objects button under your viewing screen.

At the bottom of your screen, a library of objects will appear. Step 2 (continued): Adding an Object A kangaroo will appear in your viewing screen. Your Alice world now contains a kangaroo! Click the green Done button to the right to exit the object-adding screen. Click on Animals, and then scroll to the right and click on “Class Kangaroo”, and then click “Add Instance to World.”

Also, while you’re working on your Alice world, this box will pop up about every 15 minutes. You should always click Save right now. This way, if Alice crashes, or if your computer crashes, you will have backups of your world and will not lose all of your work! Saving your world

Before we do anything else, let’s save our world. You should also always do this before you close out of Alice. Click on File at the top left-hand corner of your screen, and then click on Save World.

Saving your world In the box that pops up, name your world island, and save it in a place that you will be able to find again, such as in a folder on your Desktop.

To find a list of methods the kangaroo can do, click on the word kangaroo in the object tree, which is the list of objects in your world at the top left of the screen. Below the object tree, click on the methods tab to see a list of methods. Step 3: Finding the methods To control the kangaroo’s actions, we must use commands called methods. Object Tree Top left Bottom Right

Method A method is a series of instructions given to objects that describe actions to take.  All objects in Alice have some methods already built-in.  The vast majority of objects can “say”, or “move”, or “turn”, and so forth.  However, we can write our own methods for objects that are built from smaller ones. This is one of the fundamental ideas in computer programming - using smaller methods as building blocks for more complex commands.

Method (cont.) For instance, or example : Let’s say I wanted to make an object walk realistically in Alice. Walking is more than just moving forward, right? I would write smaller methods that have the legs bend at the knees and move one at a time. I could write other methods that make the arms swing back and forth. I could then combine these methods into a larger “walk” method that would make the character walk like a human being.

This is called the method editor, and this is where we will put a list of the methods that we want our kangaroo to carry out. Find the Do in order button at the bottom of the method editor, and drag and drop it into the method editor. Now, when we drag and drop methods inside this Do in order, they will be carried out one by one, in the order that they are listed. Step 4: Adding Methods

Let’s make the kangaroo move backwards and then forwards again. Find the move method in the kangaroo’s list of methods, click on it, and drag it over to the Do in order. Release your mouse button to drop it there. Step 4 (continued): Adding Methods

When you drop the move method, you will see a gray drop down menu appear. Slide your mouse to backwards for direction. Then a list of amounts will appear; click on 5 meters. Your method editor should look like this when you’re done. This is your first Alice programming statement telling the kangaroo to move backwards, using the move method. Step 5: Method Specifics

Let’s make the kangaroo move forward to its original position. Right click on the word move in the statement you placed in the editor and click make copy. Now you have the same statement twice. On the lower move statement, click on the small down arrow next to the word backward. A list of directions will drop down. Click on forward to change the direction of the second statement to forward. Step 6: Finishing the Method

Now you can play your world, and your kangaroo will carry out the program in your method editor. Step 7: Playing Your World Find the Play button in the upper left- hand corner of your screen, and watch your kangaroo in action. Click Restart to see the animation again, and click Stop when you are done.

What if you want to get rid of a statement from your method editor? Click on the leftmost part of the statement and drag it up to the trash can in the upper left-hand corner. When the outlines around both the trash can and method are green, drop the method to delete it. Try this on the kangaroo move forward method. Both outlines are green. Step 8: Editing your program

Now how do you get your method back if you decide you want it after all? By clicking on the Undo button in the upper left hand corner of the screen. You can use this button to undo any mistakes you make in Alice. It is very important, and will save you from a lot of frustration. Click on Undo to get back your kangaroo move forward method. Step 8 (continued): Editing your program

You can also make your kangaroo carry out more than one method at once, by using Do together. Let’s make the kangaroo turn its tail and say “Crikey!” at the same time. Find the Do together button at the bottom of your method editor and drag and drop it under your Do in order. Step 9: Doing two methods at once

We want to move only the tail so we need to find that specific part. Click the plus sign to the left of kangaroo in the object tree. A list of the kangaroo’s parts will appear. Click on tail, and a list of the tail’s methods will appear below the object tree. Step 10: Moving a Specific Part

To make the tail turn, drag and drop the tail’s turn method into the Do together. On the drop down menu of directions, choose left, and then for the amount, choose 1 revolution (all the way around). Try playing your world to see what it looks like. Step 10 (continued): Moving a Specific Part

Click on the kangaroo in the object tree to display the kangaroo’s methods again. To make the kangaroo talk, click on the say method and drop it into the Do together under the turn method. On the drop down menu that appears, click on “other…” and then type in “Crikey!”. Then click OK. Step 11: Talking

It seems that the kangaroo says “Crikey!” a little too quickly. To make the speech bubble stay on the screen longer, we can adjust the length of the method’s time. Play your world to see how it looks so far. Step 12: Adjusting the Timing On the kangaroo say Crikey! method, click on the word “more…”. Select duration. You can see that the duration is set at 1 second, so change it to 2 seconds. Then play your world and see the difference in timing.

When you are finished, your program will look like this: These are only the very basics of what you can do with Alice. It’s your turn to create! BASICS-Create a world; add three characters; have your characters discuss internet safety (something new you learned); put your characters in motion. See Rubric for additional requirements Step 13: Your Turn!