Vastly improve following.

1 files changed, 17 insertions, 5 deletions

diff --git a/src/common.hpp b/src/common.hpp
index 7221b44..87706c8 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -266,13 +266,16 @@ namespace interface {
 		float em;
 
 		struct {
+			v2f_t zero_point_s = v2f_t(0, 0);
 			v2f_t center = v2f_t(0, 0);
-			int target_zoom = 3;
-			float zoom = 3.0f;
+
+			int zoom = 3;
+			float zoom_s = 3.0f;
+
 			bool panning = false;
 			sf::Vector2f pan_ref;
+
 			bool following = true;
-			v2f_t follow_center = v2f_t(0, 0);
 		} camera;
 
 		struct {
@@ -290,6 +293,8 @@ namespace interface {
 		double perf_hist[10] = {0};
 		size_t perf_hist_index = 0;
 
+		void start_following(void);
+		void stop_following(void);
 	public:
 		state_t(sf::RenderWindow *window_, game::state_t *game);
 		void tick(double dt);
@@ -408,7 +413,14 @@ T bilerp(T a, T b, T c, T d, T x, T y)
 	return lerp(ab, cd, y);
 }
 
-static inline float expfade(float a, float b, float l, float dt)
+template <typename T>
+static inline void expfade(T *a, T b, T l, T dt)
+{
+	*a = b + (*a - b) * exp(-l * dt);
+}
+
+template <typename T, size_t N>
+static inline void expfade(vec_t<T, N> *a, vec_t<T, N>  b, float l, float dt)
 {
-	return b + (a - b) * exp(-l * dt);
+	*a = b + (*a - b) * exp(-l * dt);
 }