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Hallucino edited this page May 4, 2017 · 23 revisions

Welcome to the PX8 wiki!

Create a simple game

It is fairly easy to create a simple game with PX8.

You could create directly a P8 empty file with at least the section code (python or lua), with the 3 functions that will be called by the engine.

  • _init : Called once on startup, mainly to initialize your variables
  • _update: Called once per visible frame, mainly to get keyboard input for example
  • _draw: Called once per visible frame, mainly to draw things on the screen :)
px8 / python cartridge
version 1
__python__

def _init():
  pass

def _update():
  pass

def _draw():
  px8_print("Hello World", 40, 64, 1)

You can test it with:

./px8 -s 4 examples/helloworld/helloworld.p8

And normally you will be able to see:

Draw me a rectangle

In order to draw a simple rectangle on the screen, we will use the rect function, by providing the top left and bottom right coordinates. Let's add that in the draw function:

def _draw():
    px8_print("Hello World", 40, 64, 1)
    rect(30, 50, 90, 80, 7)

The last parameter is the color value, by default from 0 to 15 (you could add more colors, let's see that later), from the following palettes. By default we are using the pico8 palette, so 7 is for 'white':

Draw me a sprite

A sprite in PX8 is a 8x8 pixels data located in the sprite section. To draw a sprite you need to add the sprite section in your file. Let's add one:

__gfx__
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You could directly modify each value in your file, or use the editor:

./px8 -s 4 -e ./examples/helloworld/helloworld.p8

So let's add a simple sprite in the first entry:

and save it with F5.

You will notice that it is not super easy to save the data and the code in the same file, and slow down your workflow. So we could split our example in a PX8 file that will contains references to the code and data:

{
    "code": "./demos/helloworld/helloworld.py",
    "data": "./demos/helloworld/helloworld.dpx8"
}

where 'helloworld.py' will contain:

def _init():
    pass

def _update():
    pass

def _draw():
    px8_print("Hello World", 40, 64, 1)
    rect(30, 50, 90, 80, 7)

and 'helloworld.dpx8':

__gfx__
...
...
...

Let's display this sprite with spr at the location 20, 20:

spr(0, 20, 20)

You could display this sprite as much as you want, everywhere:

    for i in range(0, 124, 8):
        spr(0, i, 20)

And of course, you could flip horizontally or vertically the sprite by using the latest arguments:

    for i in range(0, 124, 8):
        spr(0, i, 29, flip_x=True)

    for i in range(0, 124, 8):
        spr(0, i, 38, flip_y=True)


    for i in range(0, 124, 8):
        spr(0, i, 47, flip_x=True, flip_y=True)

Draw me a crab

Move a crab

Add a background

Handle collision

Use huge MAP

Dynamically MAP generation

Use a physical engine

It is simple with Python support to use for example the Pymunk physical engine.

Please check the example in the demos directory.

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