47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
#include <basics.h>
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#include <stdio.h>
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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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ECS_TAG(ecs, Eats);
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// Entity used for Grows relationship
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ecs_entity_t grows = ecs_new_entity(ecs, "Grows");
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// Relationship objects
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ecs_entity_t apples = ecs_new_entity(ecs, "Apples");
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ecs_entity_t pears = ecs_new_entity(ecs, "Pears");
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// Create an entity with 3 relationships. Relationships are like regular components,
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// but combine two types/identifiers into an (relationship, object) pair.
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ecs_entity_t bob = ecs_new_entity(ecs, "Bob");
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// Pairs can be constructed from a type and entity
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ecs_add_pair(ecs, bob, Eats, apples);
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ecs_add_pair(ecs, bob, Eats, pears);
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// Pairs can also be constructed from two entity ids
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ecs_add_pair(ecs, bob, grows, pears);
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// Has can be used with relationships as well
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printf("Bob eats apples? %d\n", ecs_has_pair(ecs, bob, Eats, apples));
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// Wildcards can be used to match relationships
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printf("Bob grows food? %d\n", ecs_has_pair(ecs, bob, grows, EcsWildcard));
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// Print the type of the entity. Should output:
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// (Identifier,Name),(Eats,Apples),(Eats,Pears),(Grows,Pears)
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char *type_str = ecs_type_str(ecs, ecs_get_type(ecs, bob));
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printf("Bob's type: [%s]\n", type_str);
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ecs_os_free(type_str);
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// Get first target of relationship
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printf("Bob eats %s\n",
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ecs_get_name(ecs, ecs_get_target(ecs, bob, Eats, 0)));
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// Get second target of relationship
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printf("Bob also eats %s\n",
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ecs_get_name(ecs, ecs_get_target(ecs, bob, Eats, 1)));
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return ecs_fini(ecs);
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}
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