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generalize with generics

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This commit is contained in:
yuni 2024-04-05 19:34:01 +02:00
parent d90c2f82a6
commit 4512b63681
2 changed files with 28 additions and 27 deletions
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20
src/camera.rs
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@ -336,35 +336,33 @@ fn apply_input_to_player(
}
// Find the closest world object that the player is looking at
pub fn find_closest_target(
q_objects: Query<(Entity, &Transform), (With<hud::IsClickable>, Without<hud::IsTargeted>)>,
q_camera: Query<&Transform, With<Camera>>,
) -> (Option<Entity>, f32)
pub fn find_closest_target<TargetSpecifier>(
objects: Vec<(TargetSpecifier, &Transform)>,
camera_transform: &Transform,
) -> (Option<TargetSpecifier>, f32)
{
let mut closest_entity: Option<Entity> = None;
let mut closest_entity: Option<TargetSpecifier> = None;
let mut closest_distance: f32 = f32::MAX;
if let Ok(camtrans) = q_camera.get_single() {
let target_vector = (camtrans.rotation * Vec3::new(0.0, 0.0, -1.0))
let target_vector = (camera_transform.rotation * Vec3::new(0.0, 0.0, -1.0))
.normalize_or_zero();
let field_of_view = 20.0f32.to_radians();
let max_angle = field_of_view / 2.0;
for (entity, trans) in &q_objects {
for (entity, trans) in objects {
// Use Transform instead of Position because we're basing this
// not on the player mesh but on the camera, which doesn't have a position.
let pos_vector = (trans.translation - camtrans.translation)
let pos_vector = (trans.translation - camera_transform.translation)
.normalize_or_zero();
let cosine_of_angle = target_vector.dot(pos_vector);
let angle = cosine_of_angle.acos();
if angle <= max_angle {
// It's in the field of view!
//commands.entity(entity).insert(IsTargeted);
let distance = trans.translation.distance(camtrans.translation);
let distance = trans.translation.distance(camera_transform.translation);
if distance < closest_distance {
closest_distance = distance;
closest_entity = Some(entity);
}
}
}
}
return (closest_entity, closest_distance);
}

7
src/hud.rs
View file

@ -489,7 +489,7 @@ fn update(
// Target display
let target: Option<DVec3>;
if let Ok((targetpos, actr)) = q_target.get_single() {
if let Ok((targetpos, _actr)) = q_target.get_single() {
target = Some(targetpos.0);
}
else if q_target.is_empty() {
@ -600,10 +600,13 @@ fn handle_input(
if mouse_input.just_pressed(settings.key_selectobject) {
//ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::Switch));
if q_target.is_empty() {
if let (Some(entity), _dist) = camera::find_closest_target(q_objects, q_camera) {
if let Ok(camtrans) = q_camera.get_single() {
let objects: Vec<(Entity, &Transform)> = q_objects.iter().collect();
if let (Some(entity), _dist) = camera::find_closest_target::<Entity>(objects, camtrans) {
commands.entity(entity).insert(IsTargeted);
}
}
}
else {
for entity in &q_target {
commands.entity(entity).remove::<IsTargeted>();