Session 6
IF, SENSING, BROADCAST
Embedded Files
Session 6 Chicken Run
Session 6 Chicken Run
Introduction
Introduction
Your chickens are ready to race.
The only twist is that we will never know which chicken will win because of each of their random speed.
Concepts
Concepts
1. Initialisation
- Set Size
- Point to 90 degrees (important to orientate your chicken)
- Goto x=? y=? (Starting Positions)
2. When Spacebar is clicked
3. Repeat Until
4. Broadcast & Receive Broadcast
5. Motion & If On Edge, Bounce
6. IF touching colour
7. Stop Other Scripts
Instructions. Part 1. Yellow Chicken
Instructions. Part 1. Yellow Chicken
- Start a new Scratch 2.0 file.
- Import the Yellow Chicken as a sprite.
- Save your work as "Index_Class_Name_ChickenRun" in Your Workspace
- Delete the Cat sprite (cats & chickens don't play well together)
- Duplicate the Yellow Chicken costume & flip it horizontally.
- Set the chicken size to 30%
- Send the chicken to its starting position x=-150, y=100
- Point the chicken 90 degrees* and move 10 steps
- Using the Forever loop test if the chicken will change its costume every 0.1s while moving forward.
10. Add "If On Edge Bounce"
11. Set the Yellow Chicken to rotate horizontally only (so that it does not flip over)
*Why do we need to point the Yellow Chicken 90 degrees?
Save your work as "Index_Class_Name_ChickenRun" in Your Workspace
Instructions. Part 2. Finishing Line
Instructions. Part 2. Finishing Line
- In the Stage area, draw a purple vertical line as the finishing line.
- This line should not be touching the chicken as we will be looping the chicken movement until it touches this line).
- Return to Yellow Chicken script
- Add If touching [purple*]
- Broadcast <yellowWin>
- Include a new block of codes.
- When I receive <YellowWin>
- stop Other Scripts in this sprite
- When completed click the Green Flag to test one successful chicken run
Instructions. Part 3. Chicken 2 & Random Speed
Instructions. Part 3. Chicken 2 & Random Speed
- Duplicate the code for a 2nd Chicken
- Change the move 10 steps for both chickens to move [random 10 to 30 steps]
// random can be found in Operators
- this will create some randomness in your animation which the audience will enjoy
Instructions. Part 4. Who Wins?!
Instructions. Part 4. Who Wins?!
Challenge: How do we stop all the other chickens when there is already a winner crossing the line?
Clue: Use Broadcast
Clue: The following codes can be used for the Pink Chicken.
Don't forget to include the IF block inside the Repeat Until Loop to ensure that checking is done all the time.
Homework to prepare for Session 7
Homework to prepare for Session 7
To prepare for your video uploads to Youtube, you will need a gmail account.
- Your gmail account is linked to your Youtube account.
- Logging in to your gmail account automatically logs you into your Youtube account.
- So prepare your gmail account before class.
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