Introducing Scratch the Cat Shapes and Colors
Computer Programs Tell the computer what to do Without Programs – Computers do nothing Computer Programmers write the programs that make our computers do stuff
Scratch Scratch is a way to write computer programs We can tell Scratch what to do We have to be very specific We have to be very exact We have to be very complete
Open Scratch Lets look at a program that tells Scratch to draw shapes Double-Click on the File Named: SHAPES.sb
You Should See This:
Draw a Square Lets See Scratch Draw A Square Click on the Green Flag
Draw a Square Hit the “S” key Watch Scratch Draw a Square
Draw a Square How did we get Scratch to Draw a Square??? How do you draw a Square? We need to “tell” Scratch the same thing in our computer program
Program Look at the Middle Block in Scratch Code - Instructions
Drawing a Square- Instructions Key to Press
Drawing a Square- Instructions Color
Drawing A Square - Instructions Sides
Drawing A Square - Instructions Size
Drawing A Square - Instructions How to Turn
See the Color – Click on this Box Change Square - Color See the Color – Click on this Box
Change Square - Color Change the Color
Change Square - Color Pick ANY Color
Draw a Square Hit the “S” key again Watch Scratch Draw a Square in Your Color
Need to Start Over STOP
Need to Start Over Start Over
See the Size – Click on this Box Change Square - Size See the Size – Click on this Box
Change Square - Size Change the Size
Change Square - Size Type A New Number
Draw a Square Hit the “S” key again Watch Scratch Draw a Square with the New Size
Drawing A Different Square - Sides 4 Sides in a Square
Drawing A Different Square - Sides Change Number
Draw a Square Hit the “S” key again Watch Scratch Draw a Square with more or less sides 6 Sides
Drawing A Different Square – Sides – Put Back to 4
Drawing A Different Square – How to Turn Amount to Turn
Drawing A Different Square – How to Turn Change Number
Draw a Square Hit the “S” key again Watch Scratch Draw a Square? 150
Drawing A Different Square – Turn – Put Back to 90
Program Does More Look at the Middle Block in Scratch Code - Instructions
What Does this Do? Key Clicked? Sides?
Draw The Shape Hit the “T” key Watch Scratch Draw The Shape Were you Right?
Make Some Changes? Color Size Turns
Draw The Triangle Again Hit the “T” key Watch Scratch Draw The Shape See Your Changes?
Program Does More Look at the Middle Block in Scratch Code - Instructions
What Does this Do? Key Clicked? Sides? Why is this different What is it doing?
Draw The Shape Hit the “R” key Watch Scratch Draw The Shape Were you Right?
Make Some Changes? Have to change in more than 1 place Color Size Turns Have to change in more than 1 place
Draw The Rectangle Again Hit the “R” key Watch Scratch Draw The Shape See Your Changes?
Program Does More Look at the Middle Block in Scratch Code - Instructions
Lets Make Our Own Lets see what it takes to write our own program to tell the computer to draw a line: Click “FILE” FILE
Lets Make Our Own Click on “NEW” NEW
Lets Make Our Own Save Current Project: Click “YES: YES
New Program
Change Cat Lets use a different animal Click
Delete Scratch Click Scratch
Pick a New Animal New – Click Middle Star
Pick a New Animal New – Click “Animals” Folder Animals
Pick a New Animal Click on any Animal Can Scroll UP and DOWN Scroll Animals
Pick a New Animal Click: OK OK
Pick a New Animal New Animal
Give Instructions Buttons Sort Instructions
Start Click ORANGE button: CONTROL CONTROL
Flag (GO) Click on Flag Flag
Flag (GO) Drag Flag to Middle Flag
Flag (GO) Drag Flag to Middle Drag to Middle
Start in Middle of Screen Click Blue Button: MOTION Motion
Start in Middle of Screen Click on Drag to Middle Motion Go To X:_ Y:_
Start in Middle of Screen Connect to Flag Click to Flag
Start in Middle of Screen Change 10s to 0s Change to 0
Start in Middle of Screen Change 10s to 0s Change to 0
Line – Color / Width Click Green Button - PEN Pen
Line – Clear Drag to Middle CLEAR
Line – Color Connect To List Connect to List
Line – Color Drag to Middle Pen
Line – Color Connect To List Connect to List
Line – Pick Color Click on the Box Click BOX Click BOX
Line – Pick Color Pick any Color Click Color
Line – Size Drag to Middle Set Pen Size
Line – Size Connect to List Connect
Line – Size Change Change Size Change to 15
Write Line Click Drag to Middle Connect to List Pen Down Put in List
Say Hello Make it Say Hello Click on Dark Purple: LOOKS LOOKS
Say Hello Click Drag to Middle Connect to List Say Hello Connect
Test It Test – See if it works Click Green Flag
Test It
Test It No Line? Why?
Draw Line Click Blue: MOTION Motion
Draw Line Click Drag to Middle Connect to List Move 10 Steps
Draw Long Line Change Line from 10 to 150 Change to To 150 150
Test It Try It Click
Code - Instructions What Can You Change? How?