L9 - Tera's Adventure: Investigate the Code

I have opened Tera's Adventure Scratch Code at https://ncce.io/TerasAdventure

• True

• False

Answer explanation

Open https://ncce.io/TerasAdventure otherwise the rest of the questions will make no sense.

How many forever loops are in Tera’s adventure, across all sprites?

Mathematical Equivalence

OFF

Answer explanation

2 in Tera

1 in Star

1 in Snowflake

How many condition-controlled loops are in Tera’s adventure, across all sprites?

Mathematical Equivalence

OFF

Answer explanation

1 in Tera, 1 timer control

1 in Star, 1 touching control

1 in Snowflake, 1 touching control

How many count-controlled loops are in Tera’s adventure, across all sprites?

Mathematical Equivalence

OFF

Answer explanation

2 in Tera: 1 in Tera angry, 1 in Tera jump

How similar are the blocks of code on the star sprite and the snowflake sprite?

• Exactly the same

• Similar but the action when they touch Tera is different

• Not similar at all

The star sprite also contains a Forever loop. Describe the role of the first two motion blocks inside the Forever loop.

Evaluate responses using AI:

OFF

Answer explanation

The first sets the star's position back to the start point, x=202, y = -104 before it starts moving towards Tera.

Point in Direction is set to -90 has pointed the star left.

If Point in Direction had been set to 90, the star would point right.

Look at the Repeat until loop that is used with the star sprite. What condition needs to be ‘true’ for the loop to terminate?

• Touching an edge or touching Tera
• Not touching an edge or not touching Tera
• Game needs to have finished

In the same Repeat until loop, what does the Move 15 steps block do?

Evaluate responses using AI:

OFF

Answer explanation

Moves 15 pixels on the x axis towards the left edge of the screen. Same as change x by -15.

Because Point in Direction is set to -90 that has made the "forward" motion of a step be to the left.

If Point in Direction had been set to 90, the move 15 steps would have gone towards the right of the screen.

What direction do you think it would go in if you set Point in Direction to zero?

The same Forever loop contains this block of code: What do you think this block of code is doing?

Evaluate responses using AI:

OFF

Answer explanation

The sprite move code pauses for between 1 to 3 seconds before starting moving towards Tera. This adds a level of randomness to the game.

Looking at the same Forever loop, describe the purpose of its design.

Evaluate responses using AI:

OFF

Answer explanation

Short answer: it moves stars towards Tera and the left hand side of the screen, over and over again.

Longer answer: It sets the star sprite to the start position, pauses for between 1 and 3 seconds, then makes the sprite visible and moves it towards Tera until it hits Tera or hits the edge of the screen. Then it goes back to the start point and repeats itself.