Add waveland snapping (#95)

Reviewed-on: #95
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/stage/debug.rs

@@ -1,15 +1,15 @@
 use bevy::{color::palettes::css::RED, prelude::*};
 
 use crate::{
-    match_loading::MatchConfig, math::{int::FGi32, vec3::FGVec3}, stage::{
-        line::{StageCollision, StageLedgeSide},
-        manifest::{StageManifest, StageManifestRegistry},
+    game_settings::GameSettings, match_loading::MatchConfig, math::{int::FGi32, vec3::FGVec3}, stage::{
+        line::{StageCollision, StageLedgeSide, StagePolyLineSegmentType}, manifest::{StageManifest, StageManifestRegistry},
     },
 };
 
-pub fn debug_draw_scene(mut gizmos: Gizmos, stage_collision: Res<StageCollision>) {
+pub fn debug_draw_scene(mut gizmos: Gizmos, stage_collision: Res<StageCollision>, game_settings: Res<GameSettings>) {
     for poly in stage_collision.stage_polys.iter() {
-        for segment in &poly.segments {
+        for (segment, next_segment) in poly.segments.iter().zip(poly.segments.iter().cycle().skip(1)) {
+            let wavedash_normal = ((next_segment.normal.to_vec2() + segment.normal.to_vec2()) * 0.5).normalize();
             let from = segment.segment.point1().to_vec2();
             let to = segment.segment.point2().to_vec2();
             let from_3d = Vec3::new(from.x, from.y, 0.0);
@@ -18,6 +18,16 @@ pub fn debug_draw_scene(mut gizmos: Gizmos, stage_collision: Res<StageCollision>
             gizmos.line(from_3d, end_3d, RED);
             let midpoint = (from_3d + end_3d) * 0.5;
             gizmos.arrow(midpoint, midpoint + normal_3d, RED);
+            if matches!(segment.segment_type, StagePolyLineSegmentType::Floor) {
+                let radius = game_settings.fighter_common.waveland_snap_distance.to_num::<f32>();
+                let a = segment.segment.point1().to_vec2();
+                let a = Vec3::new(a.x, a.y, 0.0);
+                let b = segment.segment.point2().to_vec2();
+                let b = Vec3::new(b.x, b.y, 0.0);
+                let offset = Vec3::new(wavedash_normal.x, wavedash_normal.y, 0.0) * radius;
+                gizmos.line(a + offset, b + offset, bevy::color::palettes::css::HOT_PINK);
+                gizmos.line(a - offset, b - offset, bevy::color::palettes::css::HOT_PINK);
+            }
         }
     }