104 lines
4.2 KiB
Rust
104 lines
4.2 KiB
Rust
// pathfinder/examples/canvas_glutin_minimal/src/main.rs
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//
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// Copyright © 2019 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Demonstrates how to use the Pathfinder canvas API with `glutin`.
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use glutin::dpi::PhysicalSize;
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use glutin::{ContextBuilder, GlProfile, GlRequest};
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use glutin::event_loop::{ControlFlow, EventLoop};
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use glutin::event::{Event, KeyboardInput, VirtualKeyCode, WindowEvent};
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use glutin::window::WindowBuilder;
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use pathfinder_canvas::{Canvas, CanvasFontContext, Path2D};
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use pathfinder_color::ColorF;
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use pathfinder_geometry::rect::RectF;
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use pathfinder_geometry::vector::{vec2f, vec2i};
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use pathfinder_gl::{GLDevice, GLVersion};
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use pathfinder_resources::embedded::EmbeddedResourceLoader;
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use pathfinder_renderer::concurrent::rayon::RayonExecutor;
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use pathfinder_renderer::concurrent::scene_proxy::SceneProxy;
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use pathfinder_renderer::gpu::renderer::Renderer;
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use pathfinder_renderer::gpu::options::{DestFramebuffer, RendererOptions};
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use pathfinder_renderer::options::BuildOptions;
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fn main() {
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// Calculate the right logical size of the window.
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let event_loop = EventLoop::new();
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let window_size = vec2i(640, 480);
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let physical_window_size = PhysicalSize::new(window_size.x() as f64, window_size.y() as f64);
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// Open a window.
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let window_builder = WindowBuilder::new().with_title("Minimal example")
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.with_inner_size(physical_window_size);
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// Create an OpenGL 3.x context for Pathfinder to use.
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let gl_context = ContextBuilder::new().with_gl(GlRequest::Latest)
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.with_gl_profile(GlProfile::Core)
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.build_windowed(window_builder, &event_loop)
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.unwrap();
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// Load OpenGL, and make the context current.
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let gl_context = unsafe { gl_context.make_current().unwrap() };
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gl::load_with(|name| gl_context.get_proc_address(name) as *const _);
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// Create a Pathfinder renderer.
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let mut renderer = Renderer::new(GLDevice::new(GLVersion::GL3, 0),
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&EmbeddedResourceLoader,
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DestFramebuffer::full_window(window_size),
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RendererOptions {
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background_color: Some(ColorF::white()),
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..RendererOptions::default()
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});
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// Make a canvas. We're going to draw a house.
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let font_context = CanvasFontContext::from_system_source();
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let mut canvas = Canvas::new(window_size.to_f32()).get_context_2d(font_context);
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// Set line width.
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canvas.set_line_width(10.0);
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// Draw walls.
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canvas.stroke_rect(RectF::new(vec2f(75.0, 140.0), vec2f(150.0, 110.0)));
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// Draw door.
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canvas.fill_rect(RectF::new(vec2f(130.0, 190.0), vec2f(40.0, 60.0)));
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// Draw roof.
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let mut path = Path2D::new();
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path.move_to(vec2f(50.0, 140.0));
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path.line_to(vec2f(150.0, 60.0));
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path.line_to(vec2f(250.0, 140.0));
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path.close_path();
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canvas.stroke_path(path);
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// Render the canvas to screen.
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let scene = SceneProxy::from_scene(canvas.into_canvas().into_scene(), RayonExecutor);
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scene.build_and_render(&mut renderer, BuildOptions::default());
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gl_context.swap_buffers().unwrap();
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// Wait for a keypress.
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event_loop.run(move |event, _, control_flow| {
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match event {
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Event::WindowEvent { event: WindowEvent::CloseRequested, .. } |
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Event::WindowEvent {
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event: WindowEvent::KeyboardInput {
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input: KeyboardInput { virtual_keycode: Some(VirtualKeyCode::Escape), .. },
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..
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},
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..
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} => {
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*control_flow = ControlFlow::Exit;
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},
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_ => {
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*control_flow = ControlFlow::Wait;
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},
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};
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})
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}
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