Sun uses mass now

gamestate.c

@@ -1805,11 +1805,30 @@ float batteries_use_energy(GameState *gs, Entity *grid, float *energy_left_over,
   return energy_to_use;
 }
 
-float sun_gravity_at_point(V2 p)
+float entity_mass(Entity *m)
+{
+  if (m->body != NULL)
+    return (float)cpBodyGetMass(m->body);
+  else if (m->is_box)
+    return BOX_MASS;
+  else
+  {
+    assert(false);
+    return 0.0f;
+  }
+}
+
+float sun_gravity_accel_at_point(V2 p, Entity *entity_with_gravity)
 {
   if (V2length(V2sub(p, SUN_POS)) > SUN_NO_MORE_ELECTRICITY_OR_GRAVITY)
     return 0.0f;
-  return SUN_GRAVITY_STRENGTH;
+  V2 rel_vector = V2sub(entity_pos(entity_with_gravity), SUN_POS);
+  float mass = entity_mass(entity_with_gravity);
+  assert(mass != 0.0f);
+  float distance = V2length(rel_vector);
+  // return (GRAVITY_CONSTANT * (SUN_MASS * mass / (distance * distance))) / mass;
+  // the mass divides out
+  return (GRAVITY_CONSTANT * (SUN_MASS  / (distance * distance)));
 }
 
 void entity_ensure_in_orbit(Entity *e)
@@ -1818,7 +1837,7 @@ void entity_ensure_in_orbit(Entity *e)
 
   cpVect pos = v2_to_cp(V2sub(entity_pos(e), SUN_POS));
   cpFloat r = cpvlength(pos);
-  cpFloat v = cpfsqrt(sun_gravity_at_point(cp_to_v2(pos)) / r) / r;
+  cpFloat v = cpfsqrt(sun_gravity_accel_at_point(cp_to_v2(pos), e) / r) / r;
   cpBodySetVelocity(e->body, cpvmult(cpvperp(pos), v));
 }
 
@@ -1848,7 +1867,6 @@ void create_bomb_station(GameState *gs, V2 pos, enum BoxType platonic_type)
   Entity *grid = new_entity(gs);
   grid_create(gs, grid);
   entity_set_pos(grid, pos);
-  entity_ensure_in_orbit(grid);
   Entity *platonic_box = new_entity(gs);
   box_create(gs, platonic_box, grid, (V2){0});
   platonic_box->box_type = platonic_type;
@@ -1875,6 +1893,8 @@ void create_bomb_station(GameState *gs, V2 pos, enum BoxType platonic_type)
   BOX_AT_TYPE(grid, ((V2){-BOX_SIZE * 6.0, -BOX_SIZE * 2.0}), BoxExplosive);
   BOX_AT_TYPE(grid, ((V2){-BOX_SIZE * 6.0, -BOX_SIZE * 3.0}), BoxExplosive);
   BOX_AT_TYPE(grid, ((V2){-BOX_SIZE * 6.0, -BOX_SIZE * 5.0}), BoxExplosive);
+  
+  entity_ensure_in_orbit(grid);
 }
 
 void create_hard_shell_station(GameState *gs, V2 pos, enum BoxType platonic_type)
@@ -1886,7 +1906,6 @@ void create_hard_shell_station(GameState *gs, V2 pos, enum BoxType platonic_type
   Entity *grid = new_entity(gs);
   grid_create(gs, grid);
   entity_set_pos(grid, pos);
-  entity_ensure_in_orbit(grid);
   Entity *platonic_box = new_entity(gs);
   box_create(gs, platonic_box, grid, (V2){0});
   platonic_box->box_type = platonic_type;
@@ -1906,6 +1925,7 @@ void create_hard_shell_station(GameState *gs, V2 pos, enum BoxType platonic_type
     BOX_AT_TYPE(grid, ((V2){x, BOX_SIZE * 5.0}), BoxHullpiece);
     BOX_AT_TYPE(grid, ((V2){x, -BOX_SIZE * 5.0}), BoxHullpiece);
   }
+  entity_ensure_in_orbit(grid);
   indestructible = false;
 }
 void create_initial_world(GameState *gs)
@@ -1928,11 +1948,11 @@ void create_initial_world(GameState *gs)
     grid_create(gs, grid);
     entity_set_pos(grid, V2add(from, V2rotate((V2){.x = -BOX_SIZE * 9.0f}, theta)));
     cpBodySetAngle(grid->body, theta + PI);
-    entity_ensure_in_orbit(grid);
     rot = Left;
     BOX_AT_TYPE(grid, ((V2){0.0f, 0.0f}), BoxMerge);
     BOX_AT(grid, ((V2){0.0f, -BOX_SIZE}));
     BOX_AT_TYPE(grid, ((V2){BOX_SIZE, 0.0f}), BoxMerge);
+    entity_ensure_in_orbit(grid);
   }
 
   {
@@ -1940,7 +1960,6 @@ void create_initial_world(GameState *gs)
     grid_create(gs, grid);
     entity_set_pos(grid, from);
     cpBodySetAngle(grid->body, theta);
-    entity_ensure_in_orbit(grid);
     rot = Left;
     BOX_AT_TYPE(grid, ((V2){-BOX_SIZE, 0.0f}), BoxMerge);
     rot = Down;
@@ -1948,6 +1967,7 @@ void create_initial_world(GameState *gs)
     rot = Up;
     BOX_AT_TYPE(grid, ((V2){0.0f, BOX_SIZE}), BoxMerge);
     cpBodySetVelocity(grid->body, v2_to_cp(V2rotate((V2){-0.4f, 0.0f}, theta)));
+    entity_ensure_in_orbit(grid);
   }
 #else
   create_bomb_station(gs, (V2){-50.0f, 0.0f}, BoxExplosive);
@@ -2297,7 +2317,7 @@ void process(GameState *gs, float dt)
 
       if (e->body != NULL)
       {
-        cpVect g = cpvmult(pos_rel_sun, -sun_gravity_at_point(entity_pos(e)) / (sqdist * cpfsqrt(sqdist)));
+        cpVect g = cpvmult(pos_rel_sun, -sun_gravity_accel_at_point(entity_pos(e), e) / (sqdist * cpfsqrt(sqdist)));
         cpBodyUpdateVelocity(e->body, g, 1.0f, dt);
       }
     }

tooling.ahk

@@ -16,6 +16,7 @@ If WinActive("flightbuild")
     Send, {Enter}
     Send, remedybg continue-execution && timeout 1 && remedybg.exe stop-debugging && msbuild && remedybg.exe start-debugging {Enter}
 }
+Send, {Blind} ; So it doesn't hold down ctrl after running! WTF
 return
 
 ^+b::

types.h

@@ -42,14 +42,15 @@
 #define VISION_RADIUS 12.0f
 #define MAX_SERVER_TO_CLIENT 1024 * 512 // maximum size of serialized gamestate buffer
 #define MAX_CLIENT_TO_SERVER 1024 * 10  // maximum size of serialized inputs and mic data
+#define GRAVITY_CONSTANT 5.0f
 #define SUN_RADIUS 10.0f
 #define SUN_NO_MORE_ELECTRICITY_OR_GRAVITY 200.0f
 #define INSTANT_DEATH_DISTANCE_FROM_SUN 2000.0f
 #define SUN_POS ((V2){50.0f, 0.0f})
 #ifdef NO_GRAVITY
-#define SUN_GRAVITY_STRENGTH 0.0f
+#define SUN_MASS 0.0f
 #else
-#define SUN_GRAVITY_STRENGTH (11.0e2f)
+#define SUN_MASS 1000000.0f
 #endif
 #define SOLAR_ENERGY_PER_SECOND 0.09f
 #define DAMAGE_TO_PLAYER_PER_BLOCK 0.1f