75 lines
2.1 KiB
Rust
75 lines
2.1 KiB
Rust
use glam::Vec3;
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use crate::world::World;
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const CAMERA_LAG: f32 = 4.0;
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const VERTICAL_BIAS: f32 = 0.4;
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const MIN_DISTANCE: f32 = 8.0;
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const MAX_DISTANCE: f32 = 24.0;
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pub fn dialog_camera_system(world: &mut World, delta: f32)
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{
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let Some((camera_entity, _)) = world.active_camera()
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else
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{
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return;
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};
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let player_pos = world.player_position();
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let character_positions: Vec<Vec3> = world
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.bubble_tags
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.all()
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.iter()
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.filter_map(|&bubble| {
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let char_entity = world.dialog_bubbles.with(bubble, |b| b.character_entity)?;
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world.transforms.with(char_entity, |t| t.position)
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})
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.collect();
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if character_positions.is_empty()
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{
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return;
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}
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let all_positions: Vec<Vec3> = std::iter::once(player_pos)
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.chain(character_positions.iter().copied())
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.collect();
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let centroid =
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all_positions.iter().copied().fold(Vec3::ZERO, |a, b| a + b) / all_positions.len() as f32;
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let max_spread = all_positions
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.iter()
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.map(|p| (*p - centroid).length())
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.fold(0.0f32, f32::max);
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let camera_distance = (max_spread * 1.8 + MIN_DISTANCE).min(MAX_DISTANCE);
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let to_player = (player_pos - centroid).normalize_or(Vec3::Z);
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let camera_back_dir = Vec3::new(to_player.x, 0.0, to_player.z).normalize_or(Vec3::Z);
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let target_camera_pos =
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centroid + camera_back_dir * camera_distance + Vec3::Y * camera_distance * VERTICAL_BIAS;
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let current_camera_pos = world
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.transforms
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.with(camera_entity, |t| t.position)
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.unwrap_or(target_camera_pos);
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let smoothed = current_camera_pos.lerp(target_camera_pos, (CAMERA_LAG * delta).min(1.0));
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world.transforms.with_mut(camera_entity, |t| {
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t.position = smoothed;
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});
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let look_target = centroid + Vec3::Y * 1.0;
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if let Some(camera) = world.cameras.get_mut(camera_entity)
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{
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let look_dir = (look_target - smoothed).normalize_or(-Vec3::Z);
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camera.yaw = look_dir.z.atan2(look_dir.x);
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camera.pitch = look_dir.y.asin();
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}
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}
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