cu_clip_by_rect.c

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/**********************************************************************
 *
 * PostGIS - Spatial Types for PostgreSQL
 * http://postgis.net
 *
 * Copyright (C) 2014 Sandro Santilli <strk@kbt.io>
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU General Public Licence. See the COPYING file.
 *
 **********************************************************************/
 
#include "CUnit/Basic.h"
#include "cu_tester.h"
 
#include "liblwgeom.h"
#include "liblwgeom_internal.h"
 
static void test_lwgeom_clip_by_rect(void)
{
        LWGEOM *in, *out;
        const char *wkt;
        char *tmp;
 
        /* Because i don't trust that much prior tests...  ;) */
        cu_error_msg_reset();
 
        wkt = "LINESTRING(0 0, 5 5, 10 0)";
        in = lwgeom_from_wkt(wkt, LW_PARSER_CHECK_NONE);
        out = lwgeom_clip_by_rect(in, 5, 0, 10, 10);
        tmp = lwgeom_to_ewkt(out);
        /* printf("%s\n", tmp); */
        ASSERT_STRING_EQUAL(tmp, "LINESTRING(5 5,10 0)");
        lwfree(tmp); lwgeom_free(out); lwgeom_free(in);
 
        wkt = "LINESTRING EMPTY";
        in = lwgeom_from_wkt(wkt, LW_PARSER_CHECK_NONE);
        out = lwgeom_clip_by_rect(in, 5, 0, 10, 10);
        tmp = lwgeom_to_ewkt(out);
        /* printf("%s\n", tmp); */
        ASSERT_STRING_EQUAL(tmp, wkt);
        lwfree(tmp); lwgeom_free(out); lwgeom_free(in);
 
        wkt = "MULTIPOINT EMPTY";
        in = lwgeom_from_wkt(wkt, LW_PARSER_CHECK_NONE);
        out = lwgeom_clip_by_rect(in, 5, 0, 10, 10);
        tmp = lwgeom_to_ewkt(out);
        /* printf("%s\n", tmp); */
        ASSERT_STRING_EQUAL(tmp, wkt);
        lwfree(tmp); lwgeom_free(out); lwgeom_free(in);
 
        wkt = "MULTIPOINT(0 0, 6 6, 7 5)";
        in = lwgeom_from_wkt(wkt, LW_PARSER_CHECK_NONE);
        out = lwgeom_clip_by_rect(in, 5, 0, 10, 10);
        tmp = lwgeom_to_ewkt(out);
        /* printf("%s\n", tmp); */
        ASSERT_STRING_EQUAL(tmp, "MULTIPOINT(6 6,7 5)");
        lwfree(tmp); lwgeom_free(out); lwgeom_free(in);
 
        /* Disjoint polygon */
        wkt = "POLYGON((311017 4773762,311016 4773749,311006 4773744,310990 4773748,310980 4773758,310985 4773771,311003 4773776,311017 4773762))";
        in = lwgeom_from_wkt(wkt, LW_PARSER_CHECK_NONE);
        out = lwgeom_clip_by_rect(in, -80, -80, 80, 80);
        //tmp = lwgeom_to_ewkt(out); printf("%s\n", tmp); lwfree(tmp);
        CU_ASSERT(lwgeom_is_empty(out));
        lwgeom_free(out); lwgeom_free(in);
 
        /* Returns NULL with an invalid polygon (line) */
        wkt = "POLYGON((1410 2055, 1410 2056, 1410 2057, 1410 2055))";
        in = lwgeom_from_wkt(wkt, LW_PARSER_CHECK_NONE);
        out = lwgeom_clip_by_rect(in, -8.000000, -8.000000, 2056.000000, 2056.000000);
        CU_ASSERT_PTR_NULL(out);
        lwgeom_free(in);
}
 
/*
** Used by test harness to register the tests in this file.
*/
void clip_by_rect_suite_setup(void);
void clip_by_rect_suite_setup(void)
{
        CU_pSuite suite = CU_add_suite("clip_by_rectangle", NULL, NULL);
        PG_ADD_TEST(suite, test_lwgeom_clip_by_rect);
}