Session 2

Position, Motion, Direction, Looks and Delays

PROJECT 2. Ant Animation

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Objectives

At the end of this challenge, you should be able to

Import, Rename & Resize sprites in Scratch 2.0
Set 3 Rotation Styles - No Rotation, Left-Right, Free Rotation
Design or Import Image to Stage Area
Familiarise with Blocks Palette - Motion, Control, Looks, Sensing, Sound
Locate the x & y position on the Stage Area and send sprite to specific coordinates/positions
Start an animation using; Green Flag, Spacebar Pressed, Object Clicked.
Set delays with timer.

ROTATION STYLES

Sprites' rotation styles can be set in the sprite information settings.

Free Rotation
Left-Right
Stop Rotation

“BROADCAST” EXPLAINED

Broadcast is an important concept in animation and games programming.

The broadcast is similar to the analogy of a recess bell.

When the bell rings and broadcast [recess],

Teachers : Will stop teaching
Students: Will greet the teachers and proceed to the canteen
Principal: Will monitor the situation at the canteen

It just takes one broadcast and everyone [sprites] and the stage will receive this broadcast and behave accordingly.

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In the example below,

who sends out the Broadcast?
who receives the Broadcast?

(I) Instructions - Ant Animation

Concepts

Initialisation Coordinates/Position
Motion (Go To vs Glide)
Delay (Timer)
Looks (Change Costume to ... vs Next Costume)
Broadcast vs "When I Receive Broadcast"

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Part I. Ant Animation

Transfer the folder [Ants] folder to your WorkSpace.
Start a new Scratch 2.0
Create a new file and save it as Index_Class_Name_Ants
Import the sprites and stage objects.
Program the animation as you have planned in Project 1.

Part II. Upload to scratch.mit.edu

Save your work in your Workspace
Upload your Ant Animation online to the Scratch website.

(II) Instructions - Rock & Soccer Ball

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Concepts

Initialisation Coordinates/Position
Set direction
Motion
Stage

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Part III. Rock & Soccer Ball

Open Scratch 2.0
Create a new file and save it as Index_Class_Name_Rock
Import 2 sprites (Rock & Ball) into the library.

Create an animation such that:

the rock will appear at coordinate (x=0 y=0)
the ball will appear at (x=-150, y =0)
it will point 45 degrees and move on top of the rock
it will point downwards (-45 degrees) and move to the bottom right of the screen (x=-150,y=0)

// the ball should not touch the rock

(III) Instructions - Plane & Soccer Ball

Plane & Soccer Ball

Open Scratch 2.0
Create a new file and save it as Index_Class_Name_Airplane
Import 2 sprites (Airplane & Ball) into the library.

Create an animation such that

the aeroplane will appear at coordinate (x=220, y=150)
it will move to the right until it touches the edge and move (or glide) back to its original position
At the same time, the ball will appear at coordinate (x = 0, y = -150).
The ball will move to the edge, bounce off the edge and move (or glide) back to its original position.

Reflections

What have you learnt from this challenge?
How do you initialise starting position?
How do you set direction?
How many ways can a sprite rotation be set? What are they?

HINTS

Initialisation Position is also known as the starting position

Ball will glide to this position on top of the Rock.

x=0 is the centre x-coordinate (position) of the stage.

Ball will glide 3 seconds to the right side of the screen at x = 177

Observe the final y-position as compared to its starting y-position.

Download(s)

You may download your Code For Fun 1 | Session 2 worksheet here.

The sprites used in this Session are in the Scratch library itself.

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