conrod_glium 0.62.0

//!
//! A simple demonstration of how to instantiate an `Image` widget.
//!

#[macro_use] extern crate conrod_core;
extern crate glium;
extern crate conrod_glium;
extern crate conrod_winit;
extern crate find_folder;
extern crate image;

mod support;

use conrod_core::{widget, Colorable, Positionable, Sizeable, Widget, color};
use glium::Surface;

const WIDTH: u32 = 800;
const HEIGHT: u32 = 600;

fn main() {
    // Build the window.
    let mut events_loop = glium::glutin::EventsLoop::new();
    let window = glium::glutin::WindowBuilder::new()
        .with_title("Image Widget Demonstration")
        .with_dimensions((WIDTH, HEIGHT).into());
    let context = glium::glutin::ContextBuilder::new()
        .with_vsync(true)
        .with_multisampling(4);
    let display = glium::Display::new(window, context, &events_loop).unwrap();
    let display = support::GliumDisplayWinitWrapper(display);

    // construct our `Ui`.
    let mut ui = conrod_core::UiBuilder::new([WIDTH as f64, HEIGHT as f64]).build();

    // A type used for converting `conrod_core::render::Primitives` into `Command`s that can be used
    // for drawing to the glium `Surface`.
    let mut renderer = conrod_glium::Renderer::new(&display.0).unwrap();

    // The `WidgetId` for our background and `Image` widgets.
    widget_ids!(struct Ids { background, rust_logo });
    let ids = Ids::new(ui.widget_id_generator());

    // Create our `conrod_core::image::Map` which describes each of our widget->image mappings.
    // In our case we only have one image, however the macro may be used to list multiple.
    let rust_logo = load_rust_logo(&display.0);
    let (w, h) = (rust_logo.get_width(), rust_logo.get_height().unwrap());
    let mut image_map = conrod_core::image::Map::new();
    let rust_logo = image_map.insert(rust_logo);

    // Poll events from the window.
    let mut event_loop = support::EventLoop::new();
    'main: loop {

        // Handle all events.
        for event in event_loop.next(&mut events_loop) {

            // Use the `winit` backend feature to convert the winit event to a conrod one.
            if let Some(event) = conrod_winit::convert_event(event.clone(), &display) {
                ui.handle_event(event);
            }

            match event {
                glium::glutin::Event::WindowEvent { event, .. } => match event {
                    // Break from the loop upon `Escape`.
                    glium::glutin::WindowEvent::CloseRequested |
                    glium::glutin::WindowEvent::KeyboardInput {
                        input: glium::glutin::KeyboardInput {
                            virtual_keycode: Some(glium::glutin::VirtualKeyCode::Escape),
                            ..
                        },
                        ..
                    } => break 'main,
                    _ => (),
                },
                _ => (),
            }
        }

        // Instantiate the widgets.
        {
            let ui = &mut ui.set_widgets();
            // Draw a light blue background.
            widget::Canvas::new().color(color::LIGHT_BLUE).set(ids.background, ui);
            // Instantiate the `Image` at its full size in the middle of the window.
            widget::Image::new(rust_logo).w_h(w as f64, h as f64).middle().set(ids.rust_logo, ui);
        }

        // Render the `Ui` and then display it on the screen.
        if let Some(primitives) = ui.draw_if_changed() {
            renderer.fill(&display.0, primitives, &image_map);
            let mut target = display.0.draw();
            target.clear_color(0.0, 0.0, 0.0, 1.0);
            renderer.draw(&display.0, &mut target, &image_map).unwrap();
            target.finish().unwrap();
        }
    }
}

// Load the Rust logo from our assets folder to use as an example image.
fn load_rust_logo(display: &glium::Display) -> glium::texture::Texture2d {
    let assets = find_folder::Search::ParentsThenKids(5, 3).for_folder("assets").unwrap();
    let path = assets.join("images/rust.png");
    let rgba_image = image::open(&std::path::Path::new(&path)).unwrap().to_rgba();
    let image_dimensions = rgba_image.dimensions();
    let raw_image = glium::texture::RawImage2d::from_raw_rgba_reversed(&rgba_image.into_raw(), image_dimensions);
    let texture = glium::texture::Texture2d::new(display, raw_image).unwrap();
    texture
}