test_lw_dist2d_pt_arc()

static void test_lw_dist2d_pt_arc ( void  )

static

Definition at line 529 of file cu_measures.c.

References DIST_MIN, DISTPTS::distance, lw_dist2d_distpts_init(), lw_dist2d_pt_arc(), LW_SUCCESS, POINT2D::x, and POINT2D::y.

Referenced by measures_suite_setup().

{
        /* int lw_dist2d_pt_arc(const POINT2D* P, const POINT2D* A1, const POINT2D* A2, const POINT2D* A3, DISTPTS* dl) */
        DISTPTS dl;
        POINT2D P, A1, A2, A3;
        int rv;


        /* Point within unit semicircle, 0.5 units from arc */
        A1.x = -1; A1.y = 0;
        A2.x = 0 ; A2.y = 1;
        A3.x = 1 ; A3.y = 0;
        P.x  = 0 ; P.y  = 0.5;

        lw_dist2d_distpts_init(&dl, DIST_MIN);
        rv = lw_dist2d_pt_arc(&P, &A1, &A2, &A3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 0.5, 0.000001);

        /* Point outside unit semicircle, 0.5 units from arc */
        P.x  = 0 ; P.y  = 1.5;
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        rv = lw_dist2d_pt_arc(&P, &A1, &A2, &A3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 0.5, 0.000001);

        /* Point outside unit semicircle, sqrt(2) units from arc end point*/
        P.x  = 0 ; P.y  = -1;
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        rv = lw_dist2d_pt_arc(&P, &A1, &A2, &A3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, sqrt(2.0), 0.000001);

        /* Point outside unit semicircle, sqrt(2)-1 units from arc end point*/
        P.x  = 1 ; P.y  = 1;
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        rv = lw_dist2d_pt_arc(&P, &A1, &A2, &A3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, sqrt(2.0)-1, 0.000001);

        /* Point on unit semicircle midpoint */
        P.x  = 0 ; P.y  = 1;
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        rv = lw_dist2d_pt_arc(&P, &A1, &A2, &A3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 0, 0.000001);

        /* Point on unit semicircle endpoint */
        P.x  = 1 ; P.y  = 0;
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        rv = lw_dist2d_pt_arc(&P, &A1, &A2, &A3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 0, 0.000001);

        /* Point on semicircle center */
        P.x  = 0 ; P.y  = 0;
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        rv = lw_dist2d_pt_arc(&P, &A1, &A2, &A3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 1, 0.000001);

        /* Point inside closed circle */
        P.x  = 0 ; P.y  = 0.5;
        A2.x = 1; A2.y = 0;
        A3 = A1;
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        rv = lw_dist2d_pt_arc(&P, &A1, &A2, &A3, &dl);
        //printf("distance %g\n", dl.distance);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 0.5, 0.000001);
}

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