test_lw_dist2d_seg_arc()

static void test_lw_dist2d_seg_arc ( void  )

static

Definition at line 602 of file cu_measures.c.

References DIST_MIN, DISTPTS::distance, lw_dist2d_distpts_init(), lw_dist2d_seg_arc(), LW_SUCCESS, POINT2D::x, and POINT2D::y.

Referenced by measures_suite_setup().

{
        /* int lw_dist2d_seg_arc(const POINT2D *A1, const POINT2D *A2, const POINT2D *B1, const POINT2D *B2, const POINT2D *B3, DISTPTS *dl) */

        DISTPTS dl;
        POINT2D A1, A2, B1, B2, B3;
        int rv;

        /* Unit semicircle */
        B1.x = -1; B1.y = 0;
        B2.x = 0 ; B2.y = 1;
        B3.x = 1 ; B3.y = 0;

        /* Edge above the unit semicircle */
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        A1.x = -2; A1.y = 2;
        A2.x = 2 ; A2.y = 2;
        rv = lw_dist2d_seg_arc(&A1, &A2, &B1, &B2, &B3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 1, 0.000001);

        /* Edge to the right of the unit semicircle */
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        A1.x = 2; A1.y = -2;
        A2.x = 2; A2.y = 2;
        rv = lw_dist2d_seg_arc(&A1, &A2, &B1, &B2, &B3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 1, 0.000001);

        /* Edge to the left of the unit semicircle */
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        A1.x = -2; A1.y = -2;
        A2.x = -2; A2.y = 2;
        rv = lw_dist2d_seg_arc(&A1, &A2, &B1, &B2, &B3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 1, 0.000001);

        /* Edge within the unit semicircle */
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        A1.x = 0; A1.y = 0;
        A2.x = 0; A2.y = 0.5;
        rv = lw_dist2d_seg_arc(&A1, &A2, &B1, &B2, &B3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 0.5, 0.000001);

        /* Edge grazing the unit semicircle */
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        A1.x = -2; A1.y = 1;
        A2.x =  2; A2.y = 1;
        rv = lw_dist2d_seg_arc(&A1, &A2, &B1, &B2, &B3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 0., 0.000001);

        /* Line grazing the unit semicircle, but edge not */
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        A1.x = 1; A1.y = 1;
        A2.x = 2; A2.y = 1;
        rv = lw_dist2d_seg_arc(&A1, &A2, &B1, &B2, &B3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, sqrt(2.0)-1, 0.000001);

        /* Edge intersecting the unit semicircle */
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        A1.x = 0; A1.y = 0;
        A2.x = 2; A2.y = 2;
        rv = lw_dist2d_seg_arc(&A1, &A2, &B1, &B2, &B3, &dl);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, 0, 0.000001);

        /* Line intersecting the unit semicircle, but edge not */
        lw_dist2d_distpts_init(&dl, DIST_MIN);
        A1.x = -1; A1.y = 1;
        A2.x = -2; A2.y = 2;
        rv = lw_dist2d_seg_arc(&A1, &A2, &B1, &B2, &B3, &dl);
        //printf("distance %g\n", dl.distance);
        CU_ASSERT_EQUAL( rv, LW_SUCCESS );
        CU_ASSERT_DOUBLE_EQUAL(dl.distance, sqrt(2.0)-1, 0.000001);
}

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