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Hallucino edited this page Sep 16, 2017 · 23 revisions

Welcome to the PX8 wiki!

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 :)

With Python:

px8 / python cartridge
version 1
__python__

def _init():
  pass

def _update():
  pass

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

With Lua:

function _init()
end

function _update()
end

function _draw()
  cls()
  print("Hello World", 40, 64, 1)
end

If you want to do the same in Rust, you will need a little bit more work:

extern crate px8;
extern crate sdl2;
extern crate time;
extern crate rand;
#[macro_use]
extern crate log;
extern crate fern;

use std::sync::{Arc, Mutex};

use px8::px8::math;
use px8::frontend;
use px8::gfx;
use px8::cartridge;
use px8::px8::{RustPlugin};
use px8::config::Players;

pub struct HelloWorld {
    pub sprite_filename: String,
    pub t: i32,
}

impl HelloWorld {
    pub fn new(sprite_filename: String) -> HelloWorld {
        HelloWorld {
            sprite_filename: sprite_filename,
            t: 0,
        }
    }
}

impl RustPlugin for HelloWorld {
    fn init(&mut self, screen: Arc<Mutex<gfx::Screen>>) -> f64 {
        match cartridge::Cartridge::parse(self.sprite_filename.clone(), false) {
            Ok(c) => screen.lock().unwrap().set_sprites(c.gfx.sprites),
            Err(e) => panic!("Impossible to load the assets {:?}", e),
        }

        return 0.;
    }

    fn update(&mut self, _players: Arc<Mutex<Players>>) -> f64 {
        debug!("HelloWorld update");

        self.t += 1;

        return 0.;
    }

    fn draw(&mut self, screen: Arc<Mutex<gfx::Screen>>) -> f64 {
        debug!("HelloWorld draw");

        screen.lock().unwrap().cls();
        screen.lock().unwrap().print("Hello World".to_string(), 40, 64, 1);

        return 0.;
    }
}


fn main() {
    let logger_config = fern::DispatchConfig {
        format: Box::new(|msg: &str, level: &log::LogLevel, _location: &log::LogLocation| {
            format!("[{}][{}] {}", time::now().strftime("%Y-%m-%d][%H:%M:%S").unwrap(), level, msg)
        }),
        output: vec![fern::OutputConfig::stdout(), fern::OutputConfig::file("output.log")],
        level: log::LogLevelFilter::Trace,
    };

    if let Err(e) = fern::init_global_logger(logger_config, log::LogLevelFilter::Info) {
        panic!("Failed to initialize global logger: {}", e);
    }


    let helloworld_example = HelloWorld::new("./examples/helloworld/helloworld.dpx8".to_string());

    let mut frontend = match frontend::Frontend::init(px8::gfx::Scale::Scale4x, false, true) {
        Err(error) => panic!("{:?}", error),
        Ok(frontend) => frontend
    };

    frontend.px8.register(helloworld_example);
    frontend.start("./sys/config/gamecontrollerdb.txt".to_string());
    frontend.run_native_cartridge();
}

You can test it with:

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

And normally you will be able to see:

In this piece of code we used the function print (to display a message) and cls (to clear the screen)

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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00000000077007700777777007700000077000000777777000000000770007700777777007777770077000000777700000000000000000000000000000000000
00000000077007700770000007700000077000000770077000000000770007700770077007700770077000000770077000000000000000000000000000000000
00000000077007700770000007700000077000000770077000000000770707700770077007700770077000000770077000000000000000000000000000000000
00000000077777700777700007700000077000000770077000000000777777700770077007777000077000000770077000000000000000000000000000000000
00000000077007700770000007700000077000000770077000000000777077700770077007700770077000000770077000000000000000000000000000000000
00000000077007700777777007777770077777700777777000000000770007700777777007700770077777700777777000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
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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 simple sprites in the first entries:

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)

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