test_lwgeom_force_clockwise()

static void test_lwgeom_force_clockwise ( void  )

static

use same check instead of strcmp to account for difference in endianness

Definition at line 766 of file cu_libgeom.c.

{
        LWGEOM *geom;
        LWGEOM *geom2;
        char *in_ewkt, *out_ewkt;
 
        /* counterclockwise, must be reversed */
        geom = lwgeom_from_wkt("POLYGON((0 0, 10 0, 10 10, 0 10, 0 0))", LW_PARSER_CHECK_NONE);
        CU_ASSERT_FALSE(lwgeom_is_clockwise(geom));
        lwgeom_force_clockwise(geom);
        in_ewkt = "POLYGON((0 0,0 10,10 10,10 0,0 0))";
        out_ewkt = lwgeom_to_ewkt(geom);
        if (strcmp(in_ewkt, out_ewkt))
                fprintf(stderr, "\nExp:   %s\nObt:  %s\n", in_ewkt, out_ewkt);
        CU_ASSERT_STRING_EQUAL(in_ewkt, out_ewkt);
        lwfree(out_ewkt);
        lwgeom_free(geom);
 
        /* clockwise, fine as is */
        geom = lwgeom_from_wkt("POLYGON((0 0, 0 10, 10 10, 10 0, 0 0))", LW_PARSER_CHECK_NONE);
        CU_ASSERT_TRUE(lwgeom_is_clockwise(geom));
        lwgeom_force_clockwise(geom);
        in_ewkt = "POLYGON((0 0,0 10,10 10,10 0,0 0))";
        out_ewkt = lwgeom_to_ewkt(geom);
        if (strcmp(in_ewkt, out_ewkt))
                fprintf(stderr, "\nExp:   %s\nObt:  %s\n", in_ewkt, out_ewkt);
        CU_ASSERT_STRING_EQUAL(in_ewkt, out_ewkt);
        lwfree(out_ewkt);
        lwgeom_free(geom);
 
        /* counterclockwise shell (must be reversed), mixed-wise holes */
        geom = lwgeom_from_wkt("POLYGON((0 0,10 0,10 10,0 10,0 0),(2 2,2 4,4 2,2 2),(6 2,8 2,8 4,6 2))", LW_PARSER_CHECK_NONE);
        CU_ASSERT_FALSE(lwgeom_is_clockwise(geom));
        lwgeom_force_clockwise(geom);
        in_ewkt = "POLYGON((0 0,0 10,10 10,10 0,0 0),(2 2,4 2,2 4,2 2),(6 2,8 2,8 4,6 2))";
        out_ewkt = lwgeom_to_ewkt(geom);
        if (strcmp(in_ewkt, out_ewkt))
                fprintf(stderr, "\nExp:  %s\nObt:  %s\n", in_ewkt, out_ewkt);
        CU_ASSERT_STRING_EQUAL(in_ewkt, out_ewkt);
        lwfree(out_ewkt);
        lwgeom_free(geom);
 
        /* clockwise shell (fine), mixed-wise holes */
        geom = lwgeom_from_wkt("POLYGON((0 0,0 10,10 10,10 0,0 0),(2 2,4 2,2 4,2 2),(6 2,8 4,8 2,6 2))", LW_PARSER_CHECK_NONE);
        CU_ASSERT_FALSE(lwgeom_is_clockwise(geom));
        lwgeom_force_clockwise(geom);
        in_ewkt = "POLYGON((0 0,0 10,10 10,10 0,0 0),(2 2,4 2,2 4,2 2),(6 2,8 2,8 4,6 2))";
        out_ewkt = lwgeom_to_ewkt(geom);
        if (strcmp(in_ewkt, out_ewkt))
                fprintf(stderr, "\nExp:  %s\nObt:  %s\n", in_ewkt, out_ewkt);
        CU_ASSERT_STRING_EQUAL(in_ewkt, out_ewkt);
        lwfree(out_ewkt);
        lwgeom_free(geom);
 
        /* clockwise narrow ring, fine as-is */
        /* NOTE: this is a narrow ring, see ticket #1302 */
        in_ewkt  = "0103000000010000000500000000917E9BA468294100917E9B8AEA2841C976BE1FA4682941C976BE9F8AEA2841B39ABE1FA46829415ACCC29F8AEA284137894120A4682941C976BE9F8AEA284100917E9BA468294100917E9B8AEA2841";
        geom = lwgeom_from_hexwkb(in_ewkt, LW_PARSER_CHECK_NONE);
        geom2 = lwgeom_from_hexwkb(in_ewkt, LW_PARSER_CHECK_NONE);
        lwgeom_force_clockwise(geom2);
 
        CU_ASSERT( lwgeom_same(geom, geom2) );
        lwgeom_free(geom);
        lwgeom_free(geom2);
}

References LW_PARSER_CHECK_NONE, lwfree(), lwgeom_force_clockwise(), lwgeom_free(), lwgeom_from_hexwkb(), lwgeom_from_wkt(), lwgeom_is_clockwise(), lwgeom_same(), and lwgeom_to_ewkt().

Referenced by libgeom_suite_setup().

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