easy screenshot plugin

crates/bevy_dev_tools/Cargo.toml

@@ -19,6 +19,7 @@ bevy_camera = { path = "../bevy_camera", version = "0.18.0-dev" }
 bevy_color = { path = "../bevy_color", version = "0.18.0-dev" }
 bevy_diagnostic = { path = "../bevy_diagnostic", version = "0.18.0-dev" }
 bevy_ecs = { path = "../bevy_ecs", version = "0.18.0-dev" }
+bevy_input = { path = "../bevy_input", version = "0.18.0-dev" }
 bevy_math = { path = "../bevy_math", version = "0.18.0-dev" }
 bevy_picking = { path = "../bevy_picking", version = "0.18.0-dev" }
 bevy_render = { path = "../bevy_render", version = "0.18.0-dev" }

crates/bevy_dev_tools/src/easy_screenshot.rs

@@ -0,0 +1,67 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use bevy_app::{App, Plugin, Update};
+use bevy_ecs::prelude::*;
+use bevy_input::{common_conditions::input_just_pressed, keyboard::KeyCode};
+use bevy_render::view::screenshot::{save_to_disk, Screenshot};
+use bevy_window::{PrimaryWindow, Window};
+
+/// File format the screenshot will be saved in
+#[derive(Clone, Copy)]
+pub enum ScreenshotFormat {
+    /// JPEG format
+    Jpeg,
+    /// PNG format
+    Png,
+    /// BMP format
+    Bmp,
+}
+
+/// Add this plugin to your app to enable easy screenshotting.
+///
+/// Add this plugin, press the key, and you have a screenshot 🎉
+pub struct EasyScreenshotPlugin {
+    /// Key that will trigger a screenshot
+    pub trigger: KeyCode,
+    /// Format of the screenshot
+    ///
+    /// The corresponding image format must be supported by bevy renderer
+    pub format: ScreenshotFormat,
+}
+
+impl Default for EasyScreenshotPlugin {
+    fn default() -> Self {
+        EasyScreenshotPlugin {
+            trigger: KeyCode::PrintScreen,
+            format: ScreenshotFormat::Png,
+        }
+    }
+}
+
+impl Plugin for EasyScreenshotPlugin {
+    fn build(&self, app: &mut App) {
+        let format = self.format;
+        app.add_systems(
+            Update,
+            (move |mut commands: Commands, window: Single<&Window, With<PrimaryWindow>>| {
+                let since_the_epoch = SystemTime::now()
+                    .duration_since(UNIX_EPOCH)
+                    .expect("time should go forward");
+
+                commands
+                    .spawn(Screenshot::primary_window())
+                    .observe(save_to_disk(format!(
+                        "{}-{}.{}",
+                        window.title,
+                        since_the_epoch.as_millis(),
+                        match format {
+                            ScreenshotFormat::Jpeg => "jpg",
+                            ScreenshotFormat::Png => "png",
+                            ScreenshotFormat::Bmp => "bmp",
+                        }
+                    )));
+            })
+            .run_if(input_just_pressed(self.trigger)),
+        );
+    }
+}

crates/bevy_dev_tools/src/lib.rs

@@ -13,13 +13,16 @@ use bevy_app::prelude::*;
 #[cfg(feature = "bevy_ci_testing")]
 pub mod ci_testing;
 
+mod easy_screenshot;
 pub mod fps_overlay;
 pub mod frame_time_graph;
 
 pub mod picking_debug;
 
 pub mod states;
 
+pub use easy_screenshot::*;
+
 /// Enables developer tools in an [`App`]. This plugin is added automatically with `bevy_dev_tools`
 /// feature.
 ///