C++ (Cpp) ptarray_isccw Examples

Example #1

File: lwpoly.c Project: nextgis-borsch/postgis

int
lwpoly_is_clockwise(LWPOLY *poly)
{
	int i;

	if ( lwpoly_is_empty(poly) )
		return LW_TRUE;

	if ( ptarray_isccw(poly->rings[0]) )
		return LW_FALSE;

	for ( i = 1; i < poly->nrings; i++)
		if ( !ptarray_isccw(poly->rings[i]) )
			return LW_FALSE;

	return LW_TRUE;
}

Example #2

File: lwpoly.c Project: sensorseverywhere/se

void
lwpoly_force_clockwise(LWPOLY *poly)
{
	int i;

	/* No-op empties */
	if ( lwpoly_is_empty(poly) )
		return;

	/* External ring */
	if ( ptarray_isccw(poly->rings[0]) )
		ptarray_reverse(poly->rings[0]);

	/* Internal rings */
	for (i=1; i<poly->nrings; i++)
		if ( ! ptarray_isccw(poly->rings[i]) )
			ptarray_reverse(poly->rings[i]);

}

Example #3

File: cu_ptarray.c Project: NianYue/pipelinedb

static void test_ptarray_isccw(void)
{
	LWLINE *line;
	LWPOLY* poly;
	int ccw;

	/* clockwise rectangle */
	line = lwgeom_as_lwline(lwgeom_from_text("LINESTRING(0 0,0 10,10 10,10 0, 0 0)"));
	ccw = ptarray_isccw(line->points);
	CU_ASSERT_EQUAL(ccw, 0);
	lwline_free(line);

	/* clockwise triangle */
	line = lwgeom_as_lwline(lwgeom_from_text("LINESTRING(0 3,20 4,20 3, 0 3)"));
	ccw = ptarray_isccw(line->points);
	CU_ASSERT_EQUAL(ccw, 0);
	lwline_free(line);

	/* counterclockwise triangle */
	line = lwgeom_as_lwline(lwgeom_from_text("LINESTRING(0 3,20 3,20 4, 0 3)"));
	ccw = ptarray_isccw(line->points);
	CU_ASSERT_EQUAL(ccw, 1);
	lwline_free(line);

	/* counterclockwise narrow ring (see ticket #1302) */
	line = lwgeom_as_lwline(lwgeom_from_hexwkb("01020000000500000000917E9BA468294100917E9B8AEA284137894120A4682941C976BE9F8AEA2841B39ABE1FA46829415ACCC29F8AEA2841C976BE1FA4682941C976BE9F8AEA284100917E9BA468294100917E9B8AEA2841", LW_PARSER_CHECK_NONE));
	ccw = ptarray_isccw(line->points);
	CU_ASSERT_EQUAL(ccw, 1);
	lwline_free(line);

	/* clockwise narrow ring (see ticket #1302) */
	line = lwgeom_as_lwline(lwgeom_from_hexwkb("01020000000500000000917E9BA468294100917E9B8AEA2841C976BE1FA4682941C976BE9F8AEA2841B39ABE1FA46829415ACCC29F8AEA284137894120A4682941C976BE9F8AEA284100917E9BA468294100917E9B8AEA2841", LW_PARSER_CHECK_NONE));
	ccw = ptarray_isccw(line->points);
	CU_ASSERT_EQUAL(ccw, 0);
	lwline_free(line);

	/* Clockwise narrow ring (see ticket #1302) */
	poly = lwgeom_as_lwpoly(lwgeom_from_hexwkb("0103000000010000000500000000917E9BA468294100917E9B8AEA2841C976BE1FA4682941C976BE9F8AEA2841B39ABE1FA46829415ACCC29F8AEA284137894120A4682941C976BE9F8AEA284100917E9BA468294100917E9B8AEA2841", LW_PARSER_CHECK_NONE));
	ccw = ptarray_isccw(poly->rings[0]);
	CU_ASSERT_EQUAL(ccw, 0);
	lwpoly_free(poly);
}

Example #4

File: lwtriangle.c Project: gbroccolo/postgis

void
lwtriangle_force_clockwise(LWTRIANGLE *triangle)
{
	if ( ptarray_isccw(triangle->points) )
		ptarray_reverse(triangle->points);
}

Example #5

File: lwtriangle.c Project: nextgis-borsch/postgis

int
lwtriangle_is_clockwise(LWTRIANGLE *triangle)
{
	return !ptarray_isccw(triangle->points);
}