From 30603a9602b4b7cdb6958e01b9abb21a4222fbb9 Mon Sep 17 00:00:00 2001
From: Suna AI Agent <suna@kortix.ai>
Date: Sun, 19 Oct 2025 14:24:12 +0000
Subject: [PATCH] Add charging bow visualization for long touch

- Created new charging_bow module
- Implemented draw_charging_bow system
- Shows expanding arc behind Earth as touch is held
- Arc grows from 8.0 to 14.0 radius over 1 second
- Color transitions from orange to yellow as it charges
- Pulsing energy particles at bow tips when fully charged
- Visual feedback for launch force magnitude
- Helps mobile users understand charge mechanic
- Integrated into effects plugin system
---
 src/effects/charging_bow.rs | 80 +++++++++++++++++++++++++++++++++++++
 src/effects/mod.rs          | 12 ++++--
 2 files changed, 89 insertions(+), 3 deletions(-)
 create mode 100644 src/effects/charging_bow.rs

diff --git a/src/effects/charging_bow.rs b/src/effects/charging_bow.rs
new file mode 100644
index 0000000..2a886ae
--- /dev/null
+++ b/src/effects/charging_bow.rs
@@ -0,0 +1,80 @@
+use bevy::prelude::*;
+use crate::GameplaySystem;
+use crate::launching::{LaunchArmed, LaunchPad, LaunchState};
+
+pub fn plugin(app: &mut App) {
+    app.add_systems(Update, draw_charging_bow.in_set(GameplaySystem));
+}
+
+fn draw_charging_bow(
+    mut gizmos: Gizmos,
+    launch_armed: Res<LaunchArmed>,
+    launch_state: Res<LaunchState>,
+    launch_pad_query: Query<&Transform, With<LaunchPad>>,
+    time: Res<Time>,
+) {
+    // Only show bow when launch is armed and touch is being held
+    if !launch_armed.0 {
+        return;
+    }
+    
+    let Some(launch_start_time) = launch_state.launched_at_time else { return; };
+    
+    let Ok(launch_pad_transform) = launch_pad_query.single() else { return; };
+    let earth_position = launch_pad_transform.translation.truncate();
+    
+    // Calculate how long the touch has been held (capped at 1.0 seconds)
+    let held_duration = (time.elapsed_secs_f64() - launch_start_time).min(1.0) as f32;
+    let charge_percent = held_duration; // 0.0 to 1.0
+    
+    // Only draw if there's some charge
+    if charge_percent < 0.05 {
+        return;
+    }
+    
+    // Draw a bow/arc behind Earth that grows with charge
+    let bow_radius = 8.0 + charge_percent * 6.0; // 8.0 to 14.0
+    let bow_thickness = 1.0 + charge_percent * 2.0; // Visual thickness effect
+    
+    // Color transitions from orange to bright yellow as it charges
+    let color = Color::srgb(
+        1.0,
+        0.4 + charge_percent * 0.6, // 0.4 to 1.0 (orange to yellow)
+        0.0
+    ).with_alpha(0.6 + charge_percent * 0.4); // 0.6 to 1.0
+    
+    // Draw multiple arcs for thickness effect
+    for i in 0..3 {
+        let offset = i as f32 * 0.5;
+        let current_radius = bow_radius + offset;
+        
+        // Draw arc segments (180 degrees behind Earth)
+        let segments = 20;
+        for j in 0..segments {
+            let angle_start = std::f32::consts::PI + (j as f32 / segments as f32) * std::f32::consts::PI;
+            let angle_end = std::f32::consts::PI + ((j + 1) as f32 / segments as f32) * std::f32::consts::PI;
+            
+            let start = earth_position + Vec2::from_angle(angle_start) * current_radius;
+            let end = earth_position + Vec2::from_angle(angle_end) * current_radius;
+            
+            let alpha_mult = 1.0 - (i as f32 * 0.3); // Outer arcs are more transparent
+            gizmos.line_2d(start, end, color.with_alpha(color.alpha() * alpha_mult));
+        }
+    }
+    
+    // Add pulsing energy particles at the bow tips when fully charged
+    if charge_percent > 0.9 {
+        let pulse = (time.elapsed_secs() * 8.0).sin() * 0.5 + 0.5;
+        let particle_color = Color::srgb(1.0, 1.0, 0.3).with_alpha(0.8 * pulse);
+        
+        // Left tip
+        let left_tip = earth_position + Vec2::from_angle(std::f32::consts::PI) * bow_radius;
+        let iso_left = Isometry2d::from_translation(left_tip);
+        gizmos.circle_2d(iso_left, 1.5 + pulse * 0.5, particle_color);
+        
+        // Right tip
+        let right_tip = earth_position + Vec2::from_angle(0.0) * bow_radius;
+        let iso_right = Isometry2d::from_translation(right_tip);
+        gizmos.circle_2d(iso_right, 1.5 + pulse * 0.5, particle_color);
+    }
+}
\ No newline at end of file
diff --git a/src/effects/mod.rs b/src/effects/mod.rs
index 469b0c4..eaf568e 100644
--- a/src/effects/mod.rs
+++ b/src/effects/mod.rs
@@ -4,6 +4,10 @@ use crate::sun_system::{Sun, Satellite, Level};
 use crate::collision::{FatalCollisionEvent, HitBox};
 mod red_star;
 mod gravity_viz;
+mod selection_glow;
+mod touch_feedback;
+mod launch_arrow;
+mod charging_bow;
 
 #[derive(Resource)]
 struct SunFlameConfig {
@@ -37,6 +41,10 @@ pub(super) fn plugin(app: &mut App) {
     app.add_systems(Update, (update_and_render_swallow_fx).in_set(GameplaySystem));
     red_star::plugin(app);
     gravity_viz::plugin(app);
+    selection_glow::plugin(app);
+    touch_feedback::plugin(app);
+    launch_arrow::plugin(app);
+    charging_bow::plugin(app);
 }
 
 fn draw_sun_flames(
@@ -184,6 +192,4 @@ fn update_and_render_swallow_fx(
             commands.entity(e).despawn();
         }
     }
-}
-
-
+}
\ No newline at end of file