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
35 lines
863 B
Rust
35 lines
863 B
Rust
//! This example demonstrates how to use the `Camera::viewport_to_world_2d` method.
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use bevy::{color::palettes::basic::WHITE, prelude::*};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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.add_systems(Update, draw_cursor)
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.run();
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}
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fn draw_cursor(
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camera_query: Single<(&Camera, &GlobalTransform)>,
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window: Single<&Window>,
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mut gizmos: Gizmos,
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) {
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let (camera, camera_transform) = *camera_query;
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let Some(cursor_position) = window.cursor_position() else {
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return;
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};
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// Calculate a world position based on the cursor's position.
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let Ok(point) = camera.viewport_to_world_2d(camera_transform, cursor_position) else {
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return;
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};
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gizmos.circle_2d(point, 10., WHITE);
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}
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fn setup(mut commands: Commands) {
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commands.spawn(Camera2d);
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}
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