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Introducing Scratch the Cat

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Presentation on theme: "Introducing Scratch the Cat"— Presentation transcript:

1 Introducing Scratch the Cat
Shapes and Colors

2 Computer Programs Tell the computer what to do
Without Programs – Computers do nothing Computer Programmers write the programs that make our computers do stuff

3 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

4 Open Scratch Lets look at a program that tells Scratch to draw shapes
Double-Click on the File Named: SHAPES.sb

5 You Should See This:

6 Draw a Square Lets See Scratch Draw A Square Click on the Green Flag

7 Draw a Square Hit the “S” key Watch Scratch Draw a Square

8 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

9 Program Look at the Middle Block in Scratch Code - Instructions

10 Drawing a Square- Instructions
Key to Press

11 Drawing a Square- Instructions
Color

12 Drawing A Square - Instructions
Sides

13 Drawing A Square - Instructions
Size

14 Drawing A Square - Instructions
How to Turn

15 See the Color – Click on this Box
Change Square - Color See the Color – Click on this Box

16 Change Square - Color Change the Color

17 Change Square - Color Pick ANY Color

18 Draw a Square Hit the “S” key again
Watch Scratch Draw a Square in Your Color

19 Need to Start Over STOP

20 Need to Start Over Start Over

21 See the Size – Click on this Box
Change Square - Size See the Size – Click on this Box

22 Change Square - Size Change the Size

23 Change Square - Size Type A New Number

24 Draw a Square Hit the “S” key again
Watch Scratch Draw a Square with the New Size

25 Drawing A Different Square - Sides
4 Sides in a Square

26 Drawing A Different Square - Sides
Change Number

27 Draw a Square Hit the “S” key again
Watch Scratch Draw a Square with more or less sides 6 Sides

28 Drawing A Different Square – Sides – Put Back to 4

29 Drawing A Different Square – How to Turn
Amount to Turn

30 Drawing A Different Square – How to Turn
Change Number

31 Draw a Square Hit the “S” key again Watch Scratch Draw a Square? 150

32 Drawing A Different Square – Turn – Put Back to 90

33 Program Does More Look at the Middle Block in Scratch
Code - Instructions

34 What Does this Do? Key Clicked? Sides?

35 Draw The Shape Hit the “T” key Watch Scratch Draw The Shape
Were you Right?

36 Make Some Changes? Color Size Turns

37 Draw The Triangle Again
Hit the “T” key Watch Scratch Draw The Shape See Your Changes?

38 Program Does More Look at the Middle Block in Scratch
Code - Instructions

39 What Does this Do? Key Clicked? Sides? Why is this different
What is it doing?

40 Draw The Shape Hit the “R” key Watch Scratch Draw The Shape
Were you Right?

41 Make Some Changes? Have to change in more than 1 place Color Size
Turns Have to change in more than 1 place

42 Draw The Rectangle Again
Hit the “R” key Watch Scratch Draw The Shape See Your Changes?

43 Program Does More Look at the Middle Block in Scratch
Code - Instructions

44 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

45 Lets Make Our Own Click on “NEW” NEW

46 Lets Make Our Own Save Current Project: Click “YES: YES

47 New Program

48 Change Cat Lets use a different animal Click

49 Delete Scratch Click Scratch

50 Pick a New Animal New – Click Middle Star

51 Pick a New Animal New – Click “Animals” Folder Animals

52 Pick a New Animal Click on any Animal Can Scroll UP and DOWN Scroll
Animals

53 Pick a New Animal Click: OK OK

54 Pick a New Animal New Animal

55 Give Instructions Buttons Sort Instructions

56 Start Click ORANGE button: CONTROL CONTROL

57 Flag (GO) Click on Flag Flag

58 Flag (GO) Drag Flag to Middle Flag

59 Flag (GO) Drag Flag to Middle Drag to Middle

60 Start in Middle of Screen
Click Blue Button: MOTION Motion

61 Start in Middle of Screen
Click on Drag to Middle Motion Go To X:_ Y:_

62 Start in Middle of Screen
Connect to Flag Click to Flag

63 Start in Middle of Screen
Change s to 0s Change to 0

64 Start in Middle of Screen
Change s to 0s Change to 0

65 Line – Color / Width Click Green Button - PEN Pen

66 Line – Clear Drag to Middle CLEAR

67 Line – Color Connect To List Connect to List

68 Line – Color Drag to Middle Pen

69 Line – Color Connect To List Connect to List

70 Line – Pick Color Click on the Box Click BOX Click BOX

71 Line – Pick Color Pick any Color Click Color

72 Line – Size Drag to Middle Set Pen Size

73 Line – Size Connect to List Connect

74 Line – Size Change Change Size Change to 15

75 Write Line Click Drag to Middle Connect to List Pen Down Put in List

76 Say Hello Make it Say Hello Click on Dark Purple: LOOKS LOOKS

77 Say Hello Click Drag to Middle Connect to List Say Hello Connect

78 Test It Test – See if it works Click Green Flag

79 Test It

80 Test It No Line? Why?

81 Draw Line Click Blue: MOTION Motion

82 Draw Line Click Drag to Middle Connect to List Move 10 Steps

83 Draw Long Line Change Line from 10 to 150 Change to To 150 150

84 Test It Try It Click

85 Code - Instructions What Can You Change? How?


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