test_point_density()

static void test_point_density ( void  )

static

Definition at line 1573 of file cu_algorithm.c.

{
        LWGEOM *geom;
        LWMPOINT *mpt;
        LWMPOINT *mpt2;
        LWPOINT *pt;
        LWPOINT *pt2;
        int eq, i;
        // char *ewkt;
 
        /* POLYGON */
        geom = lwgeom_from_wkt("POLYGON((0 0,1 0,1 1,0 1,0 0))", LW_PARSER_CHECK_NONE);
        mpt = lwgeom_to_points(geom, 100, 0);  /* Set a zero seed to base it on Unix time and process ID */
        CU_ASSERT_EQUAL(mpt->ngeoms,100);
 
        /* Run a second time with a zero seed to get a different multipoint sequence */
        mpt2 = lwgeom_to_points(geom, 100, 0);
        eq = 0;
        for (i = 0; i < 100; i++)
        {
                pt = (LWPOINT*)mpt->geoms[i];
                pt2 = (LWPOINT*)mpt2->geoms[i];
                if (lwpoint_get_x(pt) == lwpoint_get_x(pt2) && lwpoint_get_y(pt) == lwpoint_get_y(pt2))
                        eq++;
        }
        CU_ASSERT_EQUAL(eq, 0);
        lwmpoint_free(mpt);
        lwmpoint_free(mpt2);
        pt = NULL;
        pt2 = NULL;
 
        /* Set seed to get a deterministic sequence */
        mpt = lwgeom_to_points(geom, 1000, 12345);
 
        /* Check to find a different multipoint sequence with different seed */
        mpt2 = lwgeom_to_points(geom, 1000, 54321);
        eq = 0;
        for (i = 0; i < 1000; i++)
        {
                pt = (LWPOINT*)mpt->geoms[i];
                pt2 = (LWPOINT*)mpt2->geoms[i];
                if (lwpoint_get_x(pt) == lwpoint_get_x(pt2) && lwpoint_get_y(pt) == lwpoint_get_y(pt2))
                        eq++;
        }
        CU_ASSERT_EQUAL(eq, 0);
        lwmpoint_free(mpt2);
        pt = NULL;
        pt2 = NULL;
 
        /* Check to find an identical multipoint sequence with same seed */
        mpt2 = lwgeom_to_points(geom, 1000, 12345);
        eq = 0;
        for (i = 0; i < 1000; i++)
        {
                pt = (LWPOINT*)mpt->geoms[i];
                pt2 = (LWPOINT*)mpt2->geoms[i];
                if (lwpoint_get_x(pt) == lwpoint_get_x(pt2) && lwpoint_get_y(pt) == lwpoint_get_y(pt2))
                        eq++;
        }
        CU_ASSERT_EQUAL(eq, 1000);
        lwmpoint_free(mpt2);
        pt = NULL;
        pt2 = NULL;
 
 
        /* Check if the 1000th point is the expected value.
         * Note that if the RNG is not portable, this test may fail. */
        pt = (LWPOINT*)mpt->geoms[999];
        // ewkt = lwgeom_to_ewkt((LWGEOM*)pt);
        // printf("%s\n", ewkt);
        // lwfree(ewkt);
        CU_ASSERT_DOUBLE_EQUAL(lwpoint_get_x(pt), 0.801167838758, 1e-11);
        CU_ASSERT_DOUBLE_EQUAL(lwpoint_get_y(pt), 0.345281131175, 1e-11);
        lwmpoint_free(mpt);
        pt = NULL;
 
        mpt = lwgeom_to_points(geom, 0, 0);
        CU_ASSERT_EQUAL(mpt, NULL);
        lwmpoint_free(mpt);
 
        lwgeom_free(geom);
 
        /* MULTIPOLYGON */
        geom = lwgeom_from_wkt("MULTIPOLYGON(((10 0,0 10,10 20,20 10,10 0)),((0 0,5 0,5 5,0 5,0 0)))", LW_PARSER_CHECK_NONE);
 
        mpt = lwgeom_to_points(geom, 1000, 0);
        CU_ASSERT_EQUAL(mpt->ngeoms,1000);
        lwmpoint_free(mpt);
 
        mpt = lwgeom_to_points(geom, 1, 0);
        CU_ASSERT_EQUAL(mpt->ngeoms,1);
        lwmpoint_free(mpt);
 
        lwgeom_free(geom);
}

References LWMPOINT::geoms, LW_PARSER_CHECK_NONE, lwgeom_free(), lwgeom_from_wkt(), lwgeom_to_points(), lwmpoint_free(), lwpoint_get_x(), lwpoint_get_y(), and LWMPOINT::ngeoms.

Referenced by algorithms_suite_setup().

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