prefab_example.c

int main(int argc, char *argv[]) {
    ecs_world_t *world = ecs_init_w_args(argc, argv);

    ECS_IMPORT(world, FlecsComponentsTransform, ECS_2D);
    ECS_IMPORT(world, FlecsComponentsGeometry, ECS_2D);
    ECS_IMPORT(world, FlecsComponentsGraphics, ECS_2D);
    ECS_IMPORT(world, FlecsComponentsInput, ECS_2D);
    ECS_IMPORT(world, FlecsSystemsSdl2, ECS_2D);

    ECS_ENTITY(world, WheelPrefab, EcsPrefab, EcsCircle, EcsColor);
        ecs_set(world, WheelPrefab, EcsCircle, {.radius = 12});
        ecs_set(world, WheelPrefab, EcsColor, {100, 100, 100, 255});

    ECS_ENTITY(world, CarPrefab, EcsPrefab);
        ECS_ENTITY(world, Chassis, EcsPrefab, EcsPosition2D);
            ecs_set(world, Chassis, EcsPrefab, {.parent = CarPrefab});
            ecs_set(world, Chassis, EcsPosition2D, {0, 0});
            ecs_set(world, Chassis, EcsRectangle, {.width = 100, .height = 25});

        ECS_ENTITY(world, ChassisTop, EcsPrefab, EcsPosition2D);
            ecs_set(world, ChassisTop, EcsPrefab, {.parent = CarPrefab});
            ecs_set(world, ChassisTop, EcsPosition2D, {-5, -15});
            ecs_set(world, ChassisTop, EcsRectangle, {.width = 70, .height = 25});

        ECS_ENTITY(world, WheelFront, EcsPrefab, WheelPrefab, EcsPosition2D);
            ecs_set(world, WheelFront, EcsPrefab, {.parent = CarPrefab});
            ecs_set(world, WheelFront, EcsPosition2D, {30, 15});

        ECS_ENTITY(world, WheelBack, EcsPrefab, WheelPrefab, EcsPosition2D);
            ecs_set(world, WheelBack, EcsPrefab, {.parent = CarPrefab});
            ecs_set(world, WheelBack, EcsPosition2D, {-30, 15});

    ecs_entity_t e = ecs_new(world, CarPrefab);
    ecs_set(world, e, EcsPosition2D, {-150, 0});

    e = ecs_new(world, CarPrefab);
    ecs_set(world, e, EcsPosition2D, {0, 0});

    e = ecs_new(world, CarPrefab);
    ecs_set(world, e, EcsPosition2D, {150, 0});

    /* Initialize canvas */
    ecs_set(world, 0, EcsCanvas2D, {
        .window = { .width = 800, .height = 600 }, .title = "Hello ecs_prefab_graphics!" 
    });

    /* Enter main loop */
    ecs_set_target_fps(world, 60);

    while ( ecs_progress(world, 0));

    /* Cleanup */
    return ecs_fini(world);
}