Programming 301

1. What is the difference between the Change X By block and the Move block? {"func":"blockMotionChangeXBy","values":[{"type":"number","value":"10"}]}{"func":"blockMotionMove","values":[{"type":"number","value":"10"}]}

• The Move block will move the Actor in the direction that it is facing, while the Change X By block will always move the Actor along the horizontal axis.
• The Change X By block will move the Actor in the direction that it is facing, while the Move block will always move the Actor along the horizontal axis.
• The Move block moves the Actor along the horizontal axis, while the Change X By block moves the Actor along the vertical axis.
• The Move block moves the Actor along the vertical axis, while the Change X By block moves the Actor along the horizontal axis.

2. What layer should I set a moving background to?

• Layer 0, since it’s the bottom-most layer
• Layer 1, since it’s the bottom-most layer
• Layer 10, since it’s the top-most layer
• It doesn’t matter. Adding a background as an Actor is the same as adding it as a Scene.

3. What is parallax scrolling?

• Parallax scrolling is when objects in the foreground, which are closer to you, move faster than objects in the background, which are farther away from you.
• Parallax scrolling is when objects in the background, or objects farther away from you, move faster than objects in the foreground, or objects closer to you.
• Parallax scrolling is when a background scrolls forever.
• Parallax scrolling is when objects look like they’re moving because they animate as they move.

4. How can I create an endless parallax scrolling background by adding two background Actors that scroll to the left?

• You program each background Actor to scroll slowly right beside each other. When one background Actor goes off-screen to the left, we put it directly next to the other on the right. This continues on forever.
• You program each background Actor to scroll slowly on top of each other. When one goes off-screen to the left, we delete it. This continues on forever.
• You program one background Actor to scroll slowly to the left, and the other background Actor to scroll slowly to the right. This continues on forever.
• You program each background Actor to scroll slowly right beside each other. When one background Actor goes off-screen to the left, hide it. This occurs exactly twice.

5. Which code block do I use to set the layer that an Actor is on?

• {"func":"blockLooksLayer","values":[{"type":"number","value":"0"}]}
• {"func":"blockLooksHide"}
• {"func":"blockLooksShow"}
• {"func":"blockMotionSetX","values":[{"type":"number","value":"0"}]}

6. Shelby has her dragon Actor set to Layer 2. What will happen if she sets her background Actor to Layer 3?

• The dragon will disappear, because it's underneath the background Actor, which covers the entire screen.
• The dragon will layer on top of the background correctly.
• The dragon and the background will be on the same layer.
• The dragon will appear to the right of the background Actor.

7. Michael has the enemy plane Actor set to Layer 3. The dragon is set to Layer 2. When the dragon flies through the enemy plane, what will it look like?

• The dragon will look like it’s flying underneath the plane.
• The dragon will look like it’s flying over the plane.
• The dragon will look like it’s flying through the plane, as it’ll turn transparent when the two actors touch.
• The dragon will look like it’s flying underneath the plane sometimes, and over the plane other times.

8. Andrew has three Actors that overlap: A pink dragon on top, a green dragon in the middle, and a blue dragon on the bottom. What can we say about the layers of these three Actors?

• The pink dragon’s layer is greater than the green dragon’s layer, and the green dragon’s layer is greater than the blue dragon’s layer.
• The blue dragon’s layer is greater than the pink dragon’s layer, and the pink dragon’s layer is greater than the green dragon’s layer.
• The green dragon’s layer is greater than the blue dragon’s layer, and the blue dragon’s layer is greater than the pink dragon’s layer.
• All three dragons are on the same layer.

9. Patrick has 10 Actors, each one on a different layer, starting at Layer 0 and ending at Layer 9. Which Actor will look like it's on the very bottom? Which Actor will look like it is on the very top?

• The Actor on Layer 0 will look like it's on the very bottom. The Actor on Layer 9 will look like it's on the very top.
• The Actor on Layer 9 will look like it's on the very bottom. The Actor on Layer 0 will look like it's on the very top.
• The Actor on Layer 1 will look like it's on the very bottom. The Actor on Layer 9 will look like it's on the very top.
• Even though the Actors are on different layers, they will look like they are all on one layer. No Actor will appear to be above or below another.

10. Which block will move an Actor down?

• {"func":"blockMotionChangeYBy","values":[{"type":"number","value":"-10"}]}
• {"func":"blockMotionChangeYBy","values":[{"type":"number","value":"10"}]}
• {"func":"blockMotionChangeXBy","values":[{"type":"number","value":"10"}]}
• {"func":"blockMotionChangeXBy","values":[{"type":"number","value":"-10"}]}

11. True or false: Layer 0 is the bottom-most layer.

• True
• False

12. True or false: Adding a background as an Actor is the same as adding it as a Scene.

• True
• False

13. True or false: You can program a scrolling background if you add the background as a Scene to the Stage.

• True
• False

14. True or false: You need two background Actors to create an endless scrolling background.

• True
• False

15. True or false: When creating an endless scrolling background, how you position your background Actors depends on the image size of your backgrounds.

• True
• False