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UIGridPathfinding: clear and separate A-star and Djikstra path systems

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John McCardle 2026-01-10 22:09:45 -05:00
commit b32f5af28c
7 changed files with 974 additions and 509 deletions
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37
src/UIEntity.cpp
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@ -3,6 +3,7 @@
#include "McRFPy_API.h"
#include <algorithm>
#include <cstring>
#include <libtcod.h>
#include "PyObjectUtils.h"
#include "PyVector.h"
#include "PythonObjectCache.h"
@ -749,39 +750,45 @@ PyObject* UIEntity::path_to(PyUIEntityObject* self, PyObject* args, PyObject* kw
PyErr_SetString(PyExc_ValueError, "Entity must be associated with a grid to compute paths");
return NULL;
}
// Get current position
int current_x = static_cast<int>(self->data->position.x);
int current_y = static_cast<int>(self->data->position.y);
// Validate target position
auto grid = self->data->grid;
if (target_x < 0 || target_x >= grid->grid_w || target_y < 0 || target_y >= grid->grid_h) {
PyErr_Format(PyExc_ValueError, "Target position (%d, %d) is out of grid bounds (0-%d, 0-%d)",
PyErr_Format(PyExc_ValueError, "Target position (%d, %d) is out of grid bounds (0-%d, 0-%d)",
target_x, target_y, grid->grid_w - 1, grid->grid_h - 1);
return NULL;
}
// Use the grid's Dijkstra implementation
grid->computeDijkstra(current_x, current_y);
auto path = grid->getDijkstraPath(target_x, target_y);
// Use A* pathfinding via temporary TCODPath
TCODPath tcod_path(grid->getTCODMap(), 1.41f);
if (!tcod_path.compute(current_x, current_y, target_x, target_y)) {
// No path found - return empty list
return PyList_New(0);
}
// Convert path to Python list of tuples
PyObject* path_list = PyList_New(path.size());
PyObject* path_list = PyList_New(tcod_path.size());
if (!path_list) return PyErr_NoMemory();
for (size_t i = 0; i < path.size(); ++i) {
for (int i = 0; i < tcod_path.size(); ++i) {
int px, py;
tcod_path.get(i, &px, &py);
PyObject* coord_tuple = PyTuple_New(2);
if (!coord_tuple) {
Py_DECREF(path_list);
return PyErr_NoMemory();
}
PyTuple_SetItem(coord_tuple, 0, PyLong_FromLong(path[i].first));
PyTuple_SetItem(coord_tuple, 1, PyLong_FromLong(path[i].second));
PyTuple_SetItem(coord_tuple, 0, PyLong_FromLong(px));
PyTuple_SetItem(coord_tuple, 1, PyLong_FromLong(py));
PyList_SetItem(path_list, i, coord_tuple);
}
return path_list;
}