test_lw_arc_length()

static void test_lw_arc_length ( void  )

static

Definition at line 870 of file cu_measures.c.

References lw_arc_length(), POINT2D::x, and POINT2D::y.

Referenced by measures_suite_setup().

{
/* double lw_arc_length(const POINT2D *A1, const POINT2D *A2, const POINT2D *A3) */

        POINT2D A1, A2, A3;
        double d;

        /* Unit semicircle at 0,0 */
        A1.x = -1; A1.y = 0;
        A2.x = 0 ; A2.y = 1;
        A3.x = 1 ; A3.y = 0;

        /* Arc above the unit semicircle */
        d = lw_arc_length(&A1, &A2, &A3);
        CU_ASSERT_DOUBLE_EQUAL(d, M_PI, 0.000001);
        d = lw_arc_length(&A3, &A2, &A1);
        CU_ASSERT_DOUBLE_EQUAL(d, M_PI, 0.000001);

        /* Unit semicircle at 0,0 */
        A1.x = 0; A1.y = 1;
        A2.x = 1; A2.y = 0;
        A3.x = 0; A3.y = -1;

        /* Arc to right of the unit semicircle */
        d = lw_arc_length(&A1, &A2, &A3);
        CU_ASSERT_DOUBLE_EQUAL(d, M_PI, 0.000001);
        d = lw_arc_length(&A3, &A2, &A1);
        CU_ASSERT_DOUBLE_EQUAL(d, M_PI, 0.000001);

        /* Unit 3/4 circle at 0,0 */
        A1.x = -1; A1.y = 0;
        A2.x = 1; A2.y = 0;
        A3.x = 0; A3.y = -1;

        /* Arc to right of the unit semicircle */
        d = lw_arc_length(&A1, &A2, &A3);
        CU_ASSERT_DOUBLE_EQUAL(d, 3*M_PI_2, 0.000001);
        d = lw_arc_length(&A3, &A2, &A1);
        CU_ASSERT_DOUBLE_EQUAL(d, 3*M_PI_2, 0.000001);
}

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