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Textual Programming in Python

А very simple game

For this project, let us try to make one very simple game.

Images that we are going to use for our simple game.

Rocket Planet Martian Martian with a heart

The final version of the game

This is what our final mini-game should look like.

​x
 

(rocket_final)

Loading and showing the rocket

As the first step, just load the image of the rocket and show it on the screen.

 
1
import pygame as pg
2
import pygamebg as pgbg
3
​
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(width, height) = (800, 500)
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window = pgbg.open_window(width, height, "Rocket")
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​
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# clear screen
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window.fill(pg.Color("black"))
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​
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# load image
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???
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​
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# draw rocket
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???
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pgbg.wait_loop()
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​

(rocket1)

Show the rocket on the bottom of the screen

Now adapt the program so that the rocket is shown in the bottom of the screen.

16
 
1
import pygame as pg
2
import pygamebg as pgbg
3
​
4
(width, height) = (800, 500)
5
window = pgbg.open_window(width, height, "Rocket")
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​
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# clear screen
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window.fill(pg.Color("black"))
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​
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# load image
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rocket  = pg.image.load("rocket.png")
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​
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# draw rocket
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window.blit(rocket, (0, ???))
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pgbg.wait_loop()
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​

(rocket2)

Draw the planets

Let us draw a row of planets at the top of the screen. Hint: use a loop to make the code shorter.

20
 
1
import pygame as pg
2
import pygamebg as pgbg
3
​
4
(width, height) = (800, 500)
5
window = pgbg.open_window(width, height, "Rocket")
6
​
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# load images
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rocket  = pg.image.load("rocket.png")
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planet  = pg.image.load("planet.png")
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​
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# clear screen
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window.fill(pg.Color("black"))
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​
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# draw rocket
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window.blit(rocket, (0, height - rocket.get_height()))
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​
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# draw planets
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???
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pgbg.wait_loop()
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​

(rocket3)

Animate the martian

Let us now animate the martian that moves under the planets, from the left to the right of the screen and back.

36
 
1
import pygame as pg
2
import pygamebg as pgbg
3
​
4
(width, height) = (800, 500)
5
window = pgbg.open_window(width, height, "Rocket")
6
​
7
# load images
8
rocket  = pg.image.load("rocket.png")
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planet  = pg.image.load("planet.png")
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martian = pg.image.load("martian.png")
11
​
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# martian parameters - horizontal position
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martian_x = 0
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​
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# draw game objects
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def draw():
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    # these variables are changed during animation
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    global martian_x
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​
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    # clear screen
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    window.fill(pg.Color("black"))
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​
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    # draw rocket
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    window.blit(rocket, (0, height - rocket.get_height()))
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​
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    # draw planets
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    for i in range(8):
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        window.blit(planet, (100*i, 0))
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​
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    # draw martian
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    ???
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​
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    # move martian
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    ???
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pgbg.frame_loop(100, draw)
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​

(rocket4)

React to user commands

Now enable moving the rocket to the left or to the right using the two arrow keys.

54
 
1
import pygame as pg
2
import pygamebg as pgbg
3
​
4
(width, height) = (800, 500)
5
window = pgbg.open_window(width, height, "Rocket")
6
​
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pg.key.set_repeat(10,10)
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​
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# load images
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rocket  = pg.image.load("rocket.png")
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martian = pg.image.load("martian.png")
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planet  = pg.image.load("planet.png")
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​
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# martian parameters - position and speed
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martian_x = 0
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martian_y = planet.get_height()
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martian_speed = 3
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​
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# rocket position
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???
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​
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# handle events
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def keydown(e):
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    # variable that is changed
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    global rocket_x
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    # right and left arrow moves the rocket by 5 pixels
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    if e.key == pg.K_RIGHT:
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       ???
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​
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# draw game objects
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def draw():
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    # variables that are changed in this function
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    global martian_x, martian_speed
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​
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    # clear screen
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    window.fill(pg.Color("black"))
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​
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    # draw planets
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    for i in range(8):
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        window.blit(planet, (100*i, 0))
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​
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    # draw martian
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    window.blit(martian, (martian_x, martian_y))
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​
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    # draw rocket
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    ???
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​
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    # move martian
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    martian_x += martian_speed
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    # change direction if it falls of screen
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    if martian_x < 0 or martian_x > width - martian.get_width():
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        martian_speed = -martian_speed
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pgbg.frame_loop(100, draw, {pg.KEYDOWN: keydown})
54
​

(rocket5)