39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
#include <hierarchy.h>
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#include <stdio.h>
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// When a prefab has children, they are instantiated for an instance when the
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// IsA relationship to the prefab is added.
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int main(int argc, char *argv[]) {
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ecs_world_t *ecs = ecs_init_w_args(argc, argv);
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// Create a prefab hierarchy.
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ecs_entity_t SpaceShip = ecs_new_prefab(ecs, "SpaceShip");
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ecs_entity_t SpaceShipEngine = ecs_new_prefab(ecs, "Engine");
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ecs_add_pair(ecs, SpaceShipEngine, EcsChildOf, SpaceShip);
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ecs_entity_t SpaceShipCockpit = ecs_new_prefab(ecs, "Cockpit");
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ecs_add_pair(ecs, SpaceShipCockpit, EcsChildOf, SpaceShip);
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// Instantiate the prefab. This also creates an Engine and Cockpit child
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// for the instance.
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ecs_entity_t inst = ecs_new_entity(ecs, "my_spaceship");
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ecs_add_pair(ecs, inst, EcsIsA, SpaceShip);
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ecs_entity_t inst_engine = ecs_lookup_child(ecs, inst, "Engine");
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ecs_entity_t inst_cockpit = ecs_lookup_child(ecs, inst, "Cockpit");
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char *path = ecs_get_fullpath(ecs, inst_engine);
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printf("instance engine: %s\n", path);
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ecs_os_free(path);
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path = ecs_get_fullpath(ecs, inst_cockpit);
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printf("instance cockpit: %s\n", path);
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ecs_os_free(path);
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// Output:
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// instance engine: my_spaceship.Engine
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// instance cockpit: my_spaceship.Cockpit
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return ecs_fini(ecs);
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}
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