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Building a Game in Scratch

Essential Question

How do you build a game in Scratch?

Warm Up Kahoot:217030

Learning Target

Be able to build and enhance a simple game in Scratch.

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Quiz moved to next Wednesday.

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Learning Objectives

  • To learn about the process of project design.
  • To be introduced to conditional statements in Scratch.

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Outline for the day

  • You will make a game today
  • First we will look at Game Design.
  • Once the game is designed we will implement the game in Scratch

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Design a Game: “Run Away”

  • When you start a programming project it is a good idea to brainstorm away from the computer.
  • We will start with a simple game.
  • It has 2 characters and a background.
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Design a Game

  • Description of your Good character
  • Description of your Bad character
  • Description of the Background you would like to use for your game.

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Design a Game: Controls

Key Used

Movement

Up Arrow

Move Up

Down Arrow

Move Down

Left Arrow

Move Left

Right Arrow

Move Right

Space Bar

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Design a Game: Game Play

Game Feature

Working?

Bad Person moves randomly so the Good Person can’t guess where he is going

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The Good Person starts with 5 lives (Later Lessons)

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If the Good Person is touching the Bad Person then the Good Person loses a life. (Later)

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If the Good Persons lives become equal to zero the game stops and a Game Over background appears (Later)

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When the Game restarts the background is reset and the lives are initialized back to 5. (Later)

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Design a Game: Improvements

  • Enter improvements for your game.

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Building the Game

  • Open Scratch and remove the Cat
  • Add your two characters. (Good / Bad)
  • Add your background
  • Program the Good’s movements
    • Select sprite
    • Add scripts for right arrow (Change x by 10), left arrow (Change x by -10), up arrow (Change y by 10), down arrow (Change y by -10).

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Sample Good Code

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Program the Bad

  • Sample description of motion
  • Sprite will be moving forever (Forever loop)
    • Change x by (Pick random -20 to 20)
    • Wait 0.2 sec
    • Change y by (Pick random -20 to 20)
    • Wait 0.1 sec
    • Turn (pick random -90 to 90)
    • If on edge, bounce
  • Test it. Does the bad move around randomly?
  • Modify as needed to get the motion you would like.

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Sample Bad Code

Refine these values to improve the Bad movements.

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Ouch!!!

  • Getting the Good to react to bumping into the Bad.
  • This will need to be checked forever. (Loop)
  • Say Ouch
  • Change the character (fisheye, you can pick another effect)
  • Test

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Possible Good Code

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Extensions

  • Enhance the Good functionality by including a costume change when moving in different directions
  • Add special movement keys for the Good. A jump, …
  • Alter the speed and motion of the Bad to make it more realistic.
  • Demo to your neighbors
  • Check off your sheet
  • Demo to Smith

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