use new space box trigonometric functions

lib/sb

@@ -1 +1 @@
-Subproject commit 3444afc2c1291814d97efb94ca8aecb6e6698c40
+Subproject commit 7e31b5a1c00f38dbd9d667f7e4174a5341ac550f

src/Model.cpp

@@ -1,4 +1,4 @@
-/* Cuckoo by @ohsqueezy [ohsqueezy.itch.io] */
+/* Pepy by @ohsqueezy [ohsqueezy.itch.io] */
 
 #include "Model.hpp"
 

src/Pepy.cpp

@@ -245,11 +245,12 @@ void Pepy::update()
         float distance = glm::distance(ball_center, cuckoo_center);
         if (shaking)
         {
+            /* The ball will bounce back toward the center of the cuckoo if it's a certain distance away from it. */
             if (distance > 0.65f)
             {
-                float angle = glm::atan(cuckoo_center.y - ball_center.y, cuckoo_center.x - ball_center.x);
+                /* Calculate the angle of the ball and add speed. */
+                ball.second.x = sb::angle_between(ball_center, cuckoo_center);
                 ball.second.y += 0.0005f;
-                ball.second.x = angle + glm::half_pi<float>();
             }
         }
         glm::vec2 step = sb::velocity_to_delta(ball.second);

src/Pepy.hpp

@@ -69,6 +69,7 @@ private:
     float hue_offset = 0.0f, time_seconds = 0.0f, aspect_ratio = 1.0f, return_speed = 0.0075f, cuckoo_speed = 0.0f, countdown = 10.0f;
     glm::mat4 orthographic_projection {1};
     glm::vec3 cuckoo_offset {0.0f, 0.0f, 0.0f};
+    glm::vec2 cuckoo_velocity {0.0f, 0.0f};
     bool grabbed = false;
     glm::ivec2 mouse_pixel = {0, 0};
     Plane background;