LeafRender

LeafRender is a simply, easy to use library to just get pixels onto the screen, regardless of your platform.

Supported on Windows, Linux and the Raspberry Pi.

Other libraries often require huge amounts of bootstrap which simply doesn't make sense for WIP or hobby projects.

Some support is also included for image formats and input.

Basic usage

Import the crate in your Cargo.toml with (assuming Windows/Linux OpenGL):

leafrender = "0.1.0"

In your code, have something like:

use leafrender::input::Input;
use leafrender::render::Drawer;
use leafrender::pos::Rect;
use leafrender::render::Color;
use leafrender::PlatformDrawer;
use leafrender::PlatformInput;

let mut drawer = PlatformDrawer::new("LeafRender Test", 640, 480)
       .expect("Failed to create drawer");
let mut input = PlatformInput::new();

while {
   input.update(&mut drawer);
       input.do_continue()
} {
    drawer.start();
    drawer.clear(false);
    drawer.enable_blending(); // Enable partial transparency.
                              // Left disabled by default for e.g. Pi

    drawer.draw_colored_rect(
        &Rect {
            x: 100,
            y: 100,
            width: 50,
            height: 50,
        },
        &Color {
            r: 255,
            g: 0,
            b: 0,
            a: 255,
        }
    );

    drawer.end();
}

More examples

Want some text?

use crate::render::font::FontCache;
use crate::pos::Position;

let mut font = FontCache::from_bytes(include_bytes!("Lato-Regular.ttf"))
                .expect("Unable to load font");

// [...]
// Inside your main loop, ensuring that blending is enabled (simple example above):

font.draw(
   "Hello, World!",
   &Color {
       r: 0,
       g: 0,
       b: 0,
       a: 255,
   },
   12,
   &Position {
       x: 50,
       y: 50,
   },
   &mut drawer
;

Or an image?

use image; // image crate

let image = image::load_from_memory(include_bytes!("img.jpg"))
                .expect("Failed to load image")
                .to_rgba();
let image = drawer.convert_image(&image);

// [...]
// Inside your main loop, ensuring that blending is enabled (simple example above):

drawer.draw_texture(&image, &Position {
    x: 150,
    y: 150,
});

Features

• Drawing of rectangles, vertices w/ colors
• Drawing of fonts using rusttype
• Drawing of images using image
• Basic input handling (mouse)

Wishlist

• More complete input handling (keyboard)
• Clean up a few error handling edge cases
• Few bits of safety could be cleaned up

Non-features

• 3D (too much to control here)
• Custom shaders

License

LeafRender is licensed under the Apache 2.0 license, available here.