conrod_glium 0.62.0

//! A simple example demonstrating the `Triangles` widget.

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

mod support;

use conrod_core::{color, widget, Widget};
use conrod_core::widget::triangles::Triangle;
use glium::Surface;

fn main() {
    const WIDTH: u32 = 700;
    const HEIGHT: u32 = 400;

    // Build the window.
    let mut events_loop = glium::glutin::EventsLoop::new();
    let window = glium::glutin::WindowBuilder::new()
        .with_title("Triangles!")
        .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();

    // Generate the widget identifiers.
    widget_ids!(struct Ids { triangles });
    let ids = Ids::new(ui.widget_id_generator());

    // Add a `Font` to the `Ui`'s `font::Map` from file.
    let assets = find_folder::Search::KidsThenParents(3, 5).for_folder("assets").unwrap();
    let font_path = assets.join("fonts/NotoSans/NotoSans-Regular.ttf");
    ui.fonts.insert_from_file(font_path).unwrap();

    // 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 image map describing each of our widget->image mappings (in our case, none).
    let image_map = conrod_core::image::Map::<glium::texture::Texture2d>::new();

    events_loop.run_forever(|event| {
        match event.clone() {
            glium::glutin::Event::WindowEvent { event, .. } => match event {

                // Break from the loop upon `Escape` or closed window.
                glium::glutin::WindowEvent::CloseRequested |
                glium::glutin::WindowEvent::KeyboardInput {
                    input: glium::glutin::KeyboardInput {
                        virtual_keycode: Some(glium::glutin::VirtualKeyCode::Escape),
                        ..
                    },
                    ..
                } => return glium::glutin::ControlFlow::Break,

                _ => (),
            },
            _ => (),
        }

        // Use the `winit` backend feature to convert the winit event to a conrod one.
        let input = match conrod_winit::convert_event(event, &display) {
            None => return glium::glutin::ControlFlow::Continue,
            Some(input) => input,
        };

        // Handle the input with the `Ui`.
        ui.handle_event(input);

        // Set the triangle widget.
        {
            let ui = &mut ui.set_widgets();
            let rect = ui.rect_of(ui.window).unwrap();
            let (l, r, b, t) = rect.l_r_b_t();
            let (c1, c2, c3) = (color::RED.to_rgb(), color::GREEN.to_rgb(), color::BLUE.to_rgb());

            let triangles = [
                Triangle([([l, b], c1), ([l, t], c2), ([r, t], c3)]),
                Triangle([([r, t], c1), ([r, b], c2), ([l, b], c3)]),
            ];

            widget::Triangles::multi_color(triangles.iter().cloned())
                .with_bounding_rect(rect)
                .set(ids.triangles, ui);
        }

        // Draw the `Ui` if it has changed.
        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();
        }

        glium::glutin::ControlFlow::Continue
    });
}