60 lines
1.4 KiB
Rust
60 lines
1.4 KiB
Rust
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use bevy::prelude::*;
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use bevy::input::mouse::{MouseWheel,MouseMotion};
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#[derive(Bundle, Default)]
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pub struct CamBundle {
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cam: Camera2dBundle,
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state: CameraState
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}
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impl CamBundle {
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pub fn new(scale: f32) -> Self {
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CamBundle {
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cam: Camera2dBundle {
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transform: Transform::from_scale(Vec3::new(scale, scale, 1.0)),
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..default()
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},
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state: CameraState { scale, ..default() }
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}
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}
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}
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#[derive(Component, Default)]
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pub struct CameraState {
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scale: f32,
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pos: Vec2
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}
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pub struct CameraPlugin;
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impl Plugin for CameraPlugin {
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fn build(&self, app: &mut App) {
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app.add_system(mouse_move_events);
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}
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}
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fn mouse_move_events(
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buttons: Res<Input<MouseButton>>,
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mut mouse_wheel_events: EventReader<MouseWheel>,
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mut mouse_motion_events: EventReader<MouseMotion>,
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mut query: Query<(&mut Transform, &mut CameraState)>
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) {
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let (mut transform, mut state) = query.single_mut();
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for event in mouse_wheel_events.iter() {
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let scale = state.scale;
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state.scale = (scale + event.y * 0.25 * scale)
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.clamp(0.001, 1.0);
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*transform = transform.with_scale(Vec3::new(state.scale,
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state.scale, 1.0));
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}
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if buttons.pressed(MouseButton::Left) {
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let scale = state.scale;
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for event in mouse_motion_events.iter() {
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state.pos -= event.delta * scale;
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}
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transform.translation = Vec3::new(state.pos.x, -state.pos.y, 0.0);
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}
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}
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