test_ptarray_signed_area()

static void test_ptarray_signed_area ( )

static

Definition at line 317 of file cu_ptarray.c.

{
        LWLINE *line;
        double area;
 
        /* parallelogram */
        line = lwgeom_as_lwline(lwgeom_from_text("LINESTRING(0 0,1 1, 2 1, 1 0, 0 0)"));
        area = ptarray_signed_area(line->points);
        CU_ASSERT_DOUBLE_EQUAL(area, 1.0, 0.0000001);
        lwline_free(line);
 
        /* square */
        line = lwgeom_as_lwline(lwgeom_from_text("LINESTRING(0 0,0 2, 2 2, 2 0, 0 0)"));
        area = ptarray_signed_area(line->points);
        CU_ASSERT_DOUBLE_EQUAL(area, 4.0, 0.0000001);
        lwline_free(line);
 
        /* square backwares*/
        line = lwgeom_as_lwline(lwgeom_from_text("LINESTRING(0 0,2 0, 2 2, 0 2, 0 0)"));
        area = ptarray_signed_area(line->points);
        //printf("%g\n",area);
        CU_ASSERT_DOUBLE_EQUAL(area, -4.0, 0.0000001);
        lwline_free(line);
 
}

References area(), lwgeom_as_lwline(), lwgeom_from_text(), lwline_free(), LWLINE::points, and ptarray_signed_area().

Referenced by ptarray_suite_setup().

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