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Needed Variables
Create this variable.
(Score)// For all sprites.
Coding the Player Sprite
Go to the Costume Library and choose the Rocketship sprite. Then, delete all the costumes except rocketship-a and rename the sprite to Player. In the costume editor, make the ship face to the right. Make sure it's centered. Then, add this code to the sprite.
when gf clicked set size to (50)% forever Main Game Loop:: custom blocks end define Main Game Loop if <<key (up arrow v) pressed?> or <key (w v) pressed?>> then point in direction (0) move (5) steps end if <<key (up arrow v) pressed?> or <key (d v) pressed?>> then point in direction (90) move (5) steps end if <<key (down arrow v) pressed?> or <key (s v) pressed?>> then point in direction (180) move (5) steps end if <<key (left arrow v) pressed?> or <key (a v) pressed?>> then point in direction (-90) move (5) steps end if <touching (Enemy v)?> then broadcast (Death v) end
Coding the Enemy Sprites
Choose a sprite from the library that you think is a good enemy, or draw one yourself. Create this variable in it:
(difficulty)// For this sprite only.
Then, add this code to it:
when gf clicked hide set [difficulty v] to (90) forever create clone of (myself v) end when I start as a clone if <(pick random (1) to (difficulty)) = (1)> then go to x: (0) y: (0) point in direction (pick random (-179) to (180)) move (1000) steps // You don't need to go that far, just to the edge of the screen. repeat until <touching (Player v)> point towards (Player v) move (2) steps if <touching (Laser v)> then start sound (Crunch v) // This sound can be found in the Sound Library. change [difficulty v] by (-1) delete this clone end end else delete this clone end
Coding the Laser Sprite
Obviously, the player has to have some way to fight back against the enemies, so this sprite weaponizes the ship and allows it to fire lasers at the enemies. Paint a new sprite, draw a small red centered horizontal line, and add this code to it:
when gf clicked hide forever if <key (space v) pressed?> then create clone of (myself v) start sound (Pew v) // This sound can be accessed via the Scratch sound library. wait until <not <key (space v) pressed?>> // To prevent the player from firing a steady stream of lasers. end end when I start as a clone go to (Player v) point in direction ([direction v] of (Player v):: sensing) show repeat until <<touching (edge v)> or <touching (Enemy v)>> move (20) steps end delete this clone
Coding the Death Screen
Paint a new sprite and create a death screen. It should be big enough cover the whole screen and clearly tell the player they have died. Then, add this code to it.
when gf clicked hide when I receive [Death v] go to x: (0) y: (0) show play sound (Boom Cloud v) until done // This sound can be found in the Scratch sound library. stop [all v]
Keeping Score
Find this code in the bat sprite:
when gf clicked hide set [difficulty v] to (90) forever create clone of (myself v) end when I start as a clone if <(pick random (1) to (difficulty)) = (1)> then go to x: (0) y: (0) point in direction (pick random (-179) to (180)) move (2147483647) steps // You don't need to go that far, just to the edge of the screen. This specific number is the 32-bit integer limit. repeat until <touching (Player v)> point towards (Player v) move (2) steps if <touching (Laser v)> then start sound (Crunch v) // This sound can be found in the Sound Library. change [difficulty v] by (-1) delete this clone end end else delete this clone end
And make a change. The block that is new is outlined.
when gf clicked hide set [difficulty v] to (90) forever create clone of (myself v) end when I start as a clone if <(pick random (1) to (difficulty)) = (1)> then go to x: (0) y: (0) point in direction (pick random (-179) to (180)) move (2147483647) steps // You don't need to go that far, just to the edge of the screen. This specific number is the 32-bit integer limit. repeat until <touching (Player v)> point towards (Player v) move (2) steps if <touching (Laser v)> then start sound (Crunch v) // This sound can be found in the Sound Library. change [difficulty v] by (-1) +change [score v] by (1) delete this clone end end else delete this clone end
Next, find this script in the player sprite:
when gf clicked set size to (50)% forever Main Game Loop:: custom blocks end define Main Game Loop if <<key (up arrow v) pressed?> or <key (w v) pressed?>> then point in direction (0) move (5) steps end if <<key (up arrow v) pressed?> or <key (d v) pressed?>> then point in direction (90) move (5) steps end if <<key (down arrow v) pressed?> or <key (s v) pressed?>> then point in direction (180) move (5) steps end if <<key (left arrow v) pressed?> or <key (a v) pressed?>> then point in direction (-90) move (5) steps end if <touching (Enemy v)?> then broadcast (Death v) end
And add a new block at the start. As before, it is outlined.
when gf clicked +set [Score v] to (0) set size to (50)% forever Main Game Loop:: custom blocks end define Main Game Loop if <<key (up arrow v) pressed?> or <key (w v) pressed?>> then point in direction (0) move (5) steps end if <<key (up arrow v) pressed?> or <key (d v) pressed?>> then point in direction (90) move (5) steps end if <<key (down arrow v) pressed?> or <key (s v) pressed?>> then point in direction (180) move (5) steps end if <<key (left arrow v) pressed?> or <key (a v) pressed?>> then point in direction (-90) move (5) steps end if <touching (Enemy v)?> then broadcast (Death v) end
More Things You Can Do With This Project
You can give this game a completely different feel by simply changing the costumes. For example, with a little costume editing, it is easy to turn this game into a zombie apocalypse.
Other
A link to an example project can be found here.
