In this project you ll learn how to create a game in which you have to save the Earth from space monsters.

Transcription

1 Clon Wars Introduction In this projct you ll larn how to crat a gam in which you hav to sav th Earth from spac monstrs. Stp 1: Making a Spacship Lt s mak a spacship that will dfnd th Earth! Activity Chcklist Start a nw Scratch projct and dlt th cat sprit so that your projct is mpty. You can find th onlin Scratch ditor at jumpto.cc/scratchnw. Add th stars backdrop and th Spacship sprit to your projct. Shrink th spacship and mov it nar th bottom of th scrn. 1

2 Add cod to mov your spacship to th lft th lft arrow ky is prssd. You ll nd to us ths blocks: forvr if ky lft arrow prssd? thn chang x by -4 Add cod to mov your spacship to th right th right arrow ky is prssd. Tst your projct to s whthr you can control your spacship with th arrow kys. Sav your projct Stp 2: Lightning bolts 2

3 Lt s giv th spacship th ability to fir lightning bolts! Activity Chcklist Add th Lightning sprit from th Scratch library. Whn th gam is startd, th lightning should b hiddn until th spacship firs its lasr cannons. Th sprit nds to b much smallr and upsid down. Add th following cod to th Lightning sprit. hid st siz to 25 % point in dirction -90 Add th following cod to th Spacship to crat a nw lightning bolt vr th spac ky is prssd. forvr if ky spac prssd? thn crat clon of Lightning Whnvr a nw clon is cratd, it should start in th sam plac as th spacship, and thn mov up th stag until it touchs th dg. Add th following cod to th Lightning sprit: 3

4 I start as a clon go to Spacship show rpat until touching dg? chang y by 10 dlt this clon Not: W mov th nw clon to th spacship whil it is still hiddn, bfor thn showing it. This just looks nicr. Tst your lightning, by prssing th spac ky. Sav your projct Challng: Fixing th lightning What happns if you kp th spac ky hld down? Can you us a wait block to fix this? Sav your projct Stp 3: Flying Spac-hippos Lt s add lots of flying hippos that ar trying to dstroy your spacship. Activity Chcklist Crat a nw sprit from th Hippo1 imag in th Scratch library. 4

5 St its rotation styl to b lft-right only, and add th following cod to hid th sprit th gam starts: hid Crat a nw variabl calld spd, that is for th hippo sprit only. You ll know if you v don this corrctly bcaus th variabl will hav th nam of th sprit nxt to it, lik this: 5

6 Th following cod will crat a nw hippo vry fw sconds. Th Stag is a good plac for this cod to liv: forvr wait pick random 2 to 4 scs crat clon of Hippo1 Whn ach hippo clon starts, mak it mov around th stag (at a random spd) until it gts hit by th lightning. Add this cod to th hippo sprit: I start as a clon st spd to pick random 2 to 4 go to x: pick random -220 to 220 y: 150 show rpat until touching lightning? mov spd stps turn pick random -10 to 10 dgrs if on dg, bounc dlt this clon Tst out your hippo cod. You should s a nw hippo clon appar vry fw sconds, ach moving at its own spd. 6

7 Tst your lasr cannon. If you hit a hippo, dos it vanish? Whn a hippo touchs your spacship, w nd to mak th spacship xplod! To do this, first mak sur that your spacship has 2 costums calld normal and hit. Th spacship s hit costum can b mad by importing th Sun imag from th Scratch library, and using th Color a shap tool to chang its colour. 7

8 Add this cod to your spacship so that it switchs costum vr it collids with a flying hippo: forvr switch costum to normal wait until touching? Hippo1 switch costum to hit broadcast hit wait 1 scs Did you notic that you hav broadcast a hit mssag in th cod abov? You can us this mssag to mak all of th hippos disappar th spacship is hit. Add this cod to your hippo: I rciv hit dlt this clon Tst out this cod by starting a nw gam and colliding with a hippo. 8

9 Sav your projct Challng: Livs and Scor Can you add a livs, scor or vn a highscor to your gam? You can us th Catch th Dots projct to hlp you. Sav your projct Stp 4: Fruit Bats! Lt s mak a fruit bat that throws orangs at your spacship. Activity Chcklist Firstly, mak a nw bat sprit that will mov across th top of th stag forvr. Rmmbr to tst out your cod. If you look at th bat s costums, you ll s that it alrady has 2: 9

10 Us th nxt costum block to mak th bat flap its wings as it movs. Crat a nw Orang sprit from th Scratch library Add cod to your bat, so that it crats a nw orang clon vry fw sconds. forvr wait pick random 5 to 10 scs crat clon of Orang Click on your orang sprit and add this cod to mak ach orang clon drop down th stag from th bat towards th spacship: 10

11 I start as a clon go to Bat1 show hid rpat until touching dg? chang y by -4 dlt this clon I rciv hit dlt this clon In your spacship sprit, you ll nd to modify your cod so that you ar hit if you touch a hippo or an orang: wait until touching Hippo1? or touching Orang? Tst your gam. What happns if you gt hit by a falling orang? Sav your projct Stp 5: Gam ovr Lt s add a gam ovr mssag at th nd of th gam. Activity Chcklist If you havn t alrady, crat a nw variabl calld livs. Your spacship should start with 3 livs and los a lif vr it collids with an nmy. Your gam should also stop you run out of livs. If you nd hlp, you can us th Catch th Dots projct to hlp you. Draw a nw sprit calld Gam Ovr, using th txt tool. 11

12 On your stag, broadcast a gam ovr mssag just bfor th gam nds. broadcast gam ovr wait and Add this cod to your Gam Ovr sprit, so that th mssag shows at th nd of th gam: I rciv gam ovr hid show Bcaus you v usd a broadcast [gam ovr] and wait block on your stag, it will wait for th Gam Ovr sprit to b displayd bfor nding th gam. Tst your gam. How many points can you scor? Can you think of ways to improv your gam if it is too asy or too hard? Sav your projct Challng: Improv your gam What improvmnts can you mak to your gam? Hr ar 12

13 som idas: Add halth packs that you can collct to gain xtra livs; Add floating rocks that your spacship must avoid; Mak mor nmis appar your scor gts to 100. wait until scor = 100 Sav your projct 13