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