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Add collision label support for pathfinding (closes #302)

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Add `collide` kwarg to Grid.find_path() and Grid.get_dijkstra_map() that
treats entities bearing a given label as impassable obstacles via
mark-and-restore on the TCOD walkability map. Dijkstra cache key now
includes collide label for separate caching. Add Entity.find_path()
convenience method that delegates to the grid.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
John McCardle 2026-04-02 01:34:19 -04:00
commit c1a9523ac2
7 changed files with 546 additions and 32 deletions
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22
src/UIEntity.h
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@ -79,6 +79,27 @@ public:
float move_speed = 0.15f; // #300: animation duration for movement (0 = instant)
std::string target_label; // #300: label to search for with TARGET trigger
int sight_radius = 10; // #300: FOV radius for TARGET trigger
// #303 - Per-entity FOV result cache for TARGET trigger optimization
// Caches the visibility bitmap from the last FOV computation so that
// entities that haven't moved skip recomputation entirely.
struct TargetFOVCache {
sf::Vector2i origin{-1, -1};
int radius = -1;
uint32_t transparency_gen = 0;
std::vector<bool> visibility; // (2*radius+1)^2 bitmap
int vis_side = 0; // 2*radius+1
bool isValid(sf::Vector2i pos, int r, uint32_t gen) const {
return vis_side > 0 && pos == origin && r == radius && gen == transparency_gen;
}
bool isVisible(int x, int y) const {
int dx = x - origin.x + radius;
int dy = y - origin.y + radius;
if (dx < 0 || dx >= vis_side || dy < 0 || dy >= vis_side) return false;
return visibility[dy * vis_side + dx];
}
} target_fov_cache;
//void render(sf::Vector2f); //override final;
UIEntity();
@ -120,6 +141,7 @@ public:
static PyObject* index(PyUIEntityObject* self, PyObject* Py_UNUSED(ignored));
static PyObject* die(PyUIEntityObject* self, PyObject* Py_UNUSED(ignored));
static PyObject* path_to(PyUIEntityObject* self, PyObject* args, PyObject* kwds);
static PyObject* find_path(PyUIEntityObject* self, PyObject* args, PyObject* kwds);
static PyObject* update_visibility(PyUIEntityObject* self, PyObject* Py_UNUSED(ignored));
static PyObject* visible_entities(PyUIEntityObject* self, PyObject* args, PyObject* kwds);
static int init(PyUIEntityObject* self, PyObject* args, PyObject* kwds);