logolesson1-資料下載頁
2024-09-29 20:46本頁面
【導(dǎo)讀】WhatisLogo?makemusic!WhatisLogo?mandsaregiventoa“robotturtle”.Somesamplesofthe“turtle”shape:. mandstocontrolthe“robotturtle”.Samplemands:. Eachmovementmand(FD,BK,RT,LT). the“turtlesteps”tomove(stepsareverysmall).theturn.LT90(turnleft90degrees). Astheturtlemoves,itleavesa“trail”onthe. screen.These“trails”makeshapes.FD30(hometo1stbase). LT90(turntoward2ndbase). FD30(1stbaseto2ndbase). LT90(turntoward3rdbase). FD30(2ndbaseto3rdbase). LT90(turntowardhome). FD30(3rdbasetohome). drawn?youranswers.repeated.Example:REPEAT2[FD50RT90]isthe. brackets.Tomakea. OR…tomakeaSQUARE. shape.youwereright.
【正文】 een, pointing up): FD 30 RT 90 ? Which shape would appear? SelfCheck for Lesson 1 ? Suppose you enter these mands (with the turtle starting at “home” in the middle of the screen, pointing up): FD 30 RT 90 ? Which shape would appear? SelfCheck for Lesson 1 ? Which of the following is a Logo shortcut for FD 50 LT 60 FD 50 LT 60 FD 50 LT 60 ? REPEAT 3 (FD 50 LT 60) ? REPEAT [LT 60 FD 50] ? REPEAT 3 [FD 50 LT 60] ? REPEAT [FD 50 LT 60] SelfCheck for Lesson 1 ? Which of the following is a Logo shortcut for FD 50 LT 60 FD 50 LT 60 FD 50 LT 60 ? REPEAT 3 (FD 50 LT 60) ? REPEAT [LT 60 FD 50] ? REPEAT 3 [FD 50 LT 60] ? REPEAT [FD 50 LT 60] SelfCheck for Lesson 1 ? Which of the following sets of Logo mands will move the turtle 50 steps without drawing? ? FD 50 PU ? PU FD 50 ? PE FD 50 SelfCheck for Lesson 1 ? Which of the following sets of Logo mands will move the turtle 50 steps without drawing? ? FD 50 PU ? PU FD 50 {PENUP starts no drawing} OR ? PE FD 50 {PENERASE also starts no drawing} SelfCheck for Lesson 1 ? Suppose you type these three Logo mands: ? SETBG 0 SETPC 0 FD 100 ? What will you see on the screen? SelfCheck for Lesson 1 ? Suppose you type these three Logo mands: ? SETBG 0 SETPC 0 FD 100 ? What will you see on the screen? You will see the turtle in a different place, but no line. You have instructed the turtle to draw in black on a black background! Time to Try Logo ? Use the class CDROM to start Logo or download it from the website at ? You should see two windows one for mands and one to show the drawing. FD 50 RT 90 FD 25 Time to Try Logo ? Try the activities from HandsOn Exercise 1. This is not a graded exercise. ? Experiment with the Logo mands listed on the handout for Week 1.
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