mirror of
https://github.com/bevyengine/bevy
synced 2024-12-24 20:13:07 +00:00
17e504812b
# Objective clean up example get_single method, make code clean; ## Solution - replace `Query` with `Single` Query - remove `get_single` or `get_single_mut` condition block
34 lines
863 B
Rust
34 lines
863 B
Rust
//! This example demonstrates how to use the `Camera::viewport_to_world_2d` method.
|
|
|
|
use bevy::{color::palettes::basic::WHITE, prelude::*};
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup)
|
|
.add_systems(Update, draw_cursor)
|
|
.run();
|
|
}
|
|
|
|
fn draw_cursor(
|
|
camera_query: Single<(&Camera, &GlobalTransform)>,
|
|
window: Single<&Window>,
|
|
mut gizmos: Gizmos,
|
|
) {
|
|
let (camera, camera_transform) = *camera_query;
|
|
|
|
let Some(cursor_position) = window.cursor_position() else {
|
|
return;
|
|
};
|
|
|
|
// Calculate a world position based on the cursor's position.
|
|
let Ok(point) = camera.viewport_to_world_2d(camera_transform, cursor_position) else {
|
|
return;
|
|
};
|
|
|
|
gizmos.circle_2d(point, 10., WHITE);
|
|
}
|
|
|
|
fn setup(mut commands: Commands) {
|
|
commands.spawn(Camera2d);
|
|
}
|