feat: added example simple_move_2d

examples/README.md

@@ -7,8 +7,8 @@ Simply run
 cargo run --example <example_name>
 ```
 
-| Example                                           | Description                                                                             |
-|---------------------------------------------------|-----------------------------------------------------------------------------------------|
-| [hello_world](comet/examples/hello_world)         | A simple boilerplate example to show how to properly start creating a Comet App.        |
-| [textured_entity](comet/examples/textured_entity) | This covers the basics on how to create a camera and your first entity with a texture   |
-
+| Example                            | Description                                                                            |
+|------------------------------------|----------------------------------------------------------------------------------------|
+| [hello_world](hello_world)         | A simple boilerplate example to show how to properly start creating a Comet App.       |
+| [textured_entity](textured_entity) | This covers the basics on how to create a camera and your first entity with a texture. |
+| [simple_move_2d](simple_move_2d)   | Simple demonstration of a hypothetical movement system in 2D.                          |

examples/simple_move_2d.rs

@@ -0,0 +1,73 @@
+use comet::prelude::*;
+use winit_input_helper::WinitInputHelper;
+use comet_input::keyboard::Key;
+
+fn setup(app: &mut App, renderer: &mut Renderer2D) {
+	// Takes all the textures from resources/textures and puts them into a texture atlas
+	renderer.initialize_atlas();
+
+	let camera = app.new_entity();
+	app.add_component(camera, Transform2D::new());
+	app.add_component(camera, Camera2D::new(Vec2::new(2.0, 2.0), 1.0, 1));
+
+	let e1 = app.new_entity();
+
+	app.add_component(e1, Transform2D::new());
+
+	let mut renderer2d = Render2D::new();
+	renderer2d.set_texture(r"resources/textures/comet_icon.png");
+	renderer2d.set_visibility(true);
+
+	app.add_component(e1, renderer2d);
+}
+
+fn update(app: &mut App, renderer: &mut Renderer2D, dt: f32) {
+	handle_input(app, dt);
+
+	renderer.render_scene_2d(app.scene());
+}
+
+fn handle_input(app: &mut App, dt: f32) {
+	if app.key_held(Key::KeyW)
+		|| app.key_held(Key::KeyA)
+		|| app.key_held(Key::KeyS)
+		|| app.key_held(Key::KeyD)
+	{
+		update_position(
+			app.input_manager().clone(),
+			app.get_component_mut::<Transform2D>(1).unwrap(),
+			dt
+		);
+	}
+}
+
+fn update_position(input: WinitInputHelper, transform: &mut Transform2D, dt: f32) {
+	let mut direction = Vec2::ZERO;
+
+	if input.key_held(Key::KeyW) {
+		direction += Vec2::Y;
+	}
+	if input.key_held(Key::KeyA) {
+		direction -= Vec2::X;
+	}
+	if input.key_held(Key::KeyS) {
+		direction -= Vec2::Y;
+	}
+	if input.key_held(Key::KeyD) {
+		direction += Vec2::X;
+	}
+
+	// If check to prevent division by zero and the comet to fly off into infinity...
+	if direction != Vec2::ZERO {
+		let normalized_dir = direction.normalize();
+		let displacement = normalized_dir * 777.7 * dt;
+		transform.translate(displacement);
+	}
+}
+
+fn main() {
+	App::new()
+		.with_title("Hello world")
+		.with_preset(App2D)
+		.run::<Renderer2D>(setup, update);
+}