Interact for landing gear to land

gamestate.c

@@ -842,12 +842,17 @@ bool box_enterable(Entity *box)
 
 bool box_interactible(GameState *gs, Player *for_player, Entity *box)
 {
+  (void)for_player; // make sure to handle case where for_player is NULL if you end up using this variable
   flight_assert(box->is_box);
 
   if (box->box_type == BoxMerge)
   {
     return merge_box_is_merged(gs, box);
   }
+  else if (box->box_type == BoxLandingGear)
+  {
+    return box->sees_possible_landing || box->landed_constraint != NULL;
+  }
   else
   {
     return false;
@@ -2738,6 +2743,10 @@ void process(struct GameState *gs, double dt)
               flight_assert(potential_seat->is_box);
               flight_assert(potential_seat->box_type == BoxMerge);
             }
+            if (potential_seat->box_type == BoxLandingGear)
+            {
+              potential_seat->toggle_landing = true;
+            }
           }
         }
 
@@ -3498,6 +3507,7 @@ void process(struct GameState *gs, double dt)
               }
               if (cur_box->box_type == BoxLandingGear)
               {
+                cur_box->sees_possible_landing = false; // false by default, if codepath which binds it sees landing it is set to true
                 cpVect landing_point = cpvadd(entity_pos(cur_box), cpvmult(box_facing_vector(cur_box), BOX_SIZE / 2.0));
                 Entity *must_have_shape = get_entity(gs, cur_box->shape_to_land_on);
                 bool want_have_constraint = true;
@@ -3510,11 +3520,13 @@ void process(struct GameState *gs, double dt)
                 if (want_have_constraint)
                   want_have_constraint &= cpvdist(entity_pos(must_have_shape), landing_point) < BOX_SIZE + LANDING_GEAR_MAX_DIST;
 
+                  // maybe merge all codepaths that delete constraint into one somehow, but seems hard
 #define DELETE_CONSTRAINT(constraint)               \
   {                                                 \
     cpSpaceRemoveConstraint(gs->space, constraint); \
     cpConstraintFree(constraint);                   \
     constraint = NULL;                              \
+    cur_box->shape_to_land_on = (EntityID){0};      \
   }
                 if (want_have_constraint)
                 {
@@ -3531,6 +3543,10 @@ void process(struct GameState *gs, double dt)
                     cpSpaceAddConstraint(gs->space, cur_box->landed_constraint);
                     on_create_constraint(cur_box, cur_box->landed_constraint);
                   }
+                  if (cur_box->toggle_landing)
+                  {
+                    DELETE_CONSTRAINT(cur_box->landed_constraint);
+                  }
                 }
                 else
                 {
@@ -3538,7 +3554,6 @@ void process(struct GameState *gs, double dt)
                   {
                     DELETE_CONSTRAINT(cur_box->landed_constraint);
                   }
-                  cur_box->shape_to_land_on = (EntityID){0};
 
                   // maybe see something to land on
                   cpVect along = box_facing_vector(cur_box);
@@ -3549,9 +3564,13 @@ void process(struct GameState *gs, double dt)
                   cpShape *found = cpSpaceSegmentQueryFirst(gs->space, from, to, 0.0, FILTER_DEFAULT, &query_result);
                   if (found != NULL && cpShapeGetBody(found) != box_grid(cur_box)->body)
                   {
+                    cur_box->sees_possible_landing = true;
+                    if (cur_box->toggle_landing)
                       cur_box->shape_to_land_on = get_id(gs, cp_shape_entity(found));
                   }
                 }
+
+                cur_box->toggle_landing = false; // handle it
               }
             }
           }

main.c

@@ -138,7 +138,9 @@ static sg_image image_noenergy;
 static sg_image image_orb;
 static sg_image image_orb_frozen;
 static sg_image image_radardot;
-static sg_image image_landing_gear;
+static sg_image image_landing_gear_landed;
+static sg_image image_landing_gear_could_land;
+static sg_image image_landing_gear_cant_land;
 static sg_image image_pip;
 static sg_image image_enter_exit;
 
@@ -857,7 +859,9 @@ static void init(void)
     image_orb = load_image("loaded/orb.png");
     image_orb_frozen = load_image("loaded/orb_frozen.png");
     image_radardot = load_image("loaded/radardot.png");
-    image_landing_gear = load_image("loaded/landing_gear.png");
+    image_landing_gear_landed = load_image("loaded/landing_gear_landed.png");
+    image_landing_gear_could_land = load_image("loaded/landing_gear_could_land.png");
+    image_landing_gear_cant_land = load_image("loaded/landing_gear_cant_land.png");
     image_pip = load_image("loaded/pip.png");
     image_enter_exit = load_image("loaded/enter_exit.png");
   }
@@ -2400,6 +2404,21 @@ static void frame(void)
                   if (get_entity(&gs, b->player_who_is_inside_of_me) != NULL)
                     img = image_medbay_used;
                 }
+                if (b->box_type == BoxLandingGear)
+                {
+                  if (b->landed_constraint != NULL)
+                  {
+                    img = image_landing_gear_landed;
+                  }
+                  else if (box_interactible(&gs, myplayer(), b))
+                  {
+                    img = image_landing_gear_could_land;
+                  }
+                  else
+                  {
+                    img = image_landing_gear_cant_land;
+                  }
+                }
                 if (b->box_type == BoxSolarPanel)
                 {
                   sgp_set_image(0, image_solarpanel_charging);
@@ -2412,7 +2431,7 @@ static void frame(void)
 
                 bool interactible = box_interactible(&gs, myplayer(), b);
                 bool enterable = box_enterable(b);
-                if (myplayer() != NULL && interactible || enterable)
+                if ((myplayer() != NULL && interactible) || enterable)
                 {
                   if (box_has_point((BoxCentered){
                                         .pos = entity_pos(b),

types.h

@@ -382,6 +382,8 @@ typedef struct Entity
   cpConstraint *landed_constraint; // when not null, landing gear landed on something. Only valid while shape_to_land_on is a valid reference
   // to land, set this to the shape to land on. A constraint will be created if it is valid. If it's not, it will be zerod
   EntityID shape_to_land_on; // checked for surface distance to make sure is valid
+  bool toggle_landing; // set when player commands landing gear to toggle landing state
+  bool sees_possible_landing; // set while processing, used to cosmetically show that the landing gear can be toggled
 
   PlatonicDetection detected_platonics[SCANNER_MAX_PLATONICS]; // intensity of 0.0 means undetected