test_lwline_crossing_short_lines()

static void test_lwline_crossing_short_lines ( void  )

static

Definition at line 261 of file cu_algorithm.c.

References LINE_CROSS_RIGHT, LINE_NO_CROSS, lwline_crossing_direction(), ptarray_set_point4d(), POINT4D::x, and POINT4D::y.

Referenced by algorithms_suite_setup().

{

        POINT4D p;

        /*
        ** Simple test, two two-point lines
        */

        /* Vertical line from 0,0 to 1,1 */
        p.x = 0.0;
        p.y = 0.0;
        ptarray_set_point4d(pa21, 0, &p);
        p.y = 1.0;
        ptarray_set_point4d(pa21, 1, &p);

        /* Horizontal, crossing mid-segment */
        p.x = -0.5;
        p.y = 0.5;
        ptarray_set_point4d(pa22, 0, &p);
        p.x = 0.5;
        ptarray_set_point4d(pa22, 1, &p);

        CU_ASSERT( lwline_crossing_direction(l21, l22) == LINE_CROSS_RIGHT );

        /* Horizontal, crossing at top end vertex (end crossings don't count) */
        p.x = -0.5;
        p.y = 1.0;
        ptarray_set_point4d(pa22, 0, &p);
        p.x = 0.5;
        ptarray_set_point4d(pa22, 1, &p);

        CU_ASSERT( lwline_crossing_direction(l21, l22) == LINE_NO_CROSS );

        /* Horizontal, crossing at bottom end vertex */
        p.x = -0.5;
        p.y = 0.0;
        ptarray_set_point4d(pa22, 0, &p);
        p.x = 0.5;
        ptarray_set_point4d(pa22, 1, &p);

        CU_ASSERT( lwline_crossing_direction(l21, l22) == LINE_CROSS_RIGHT );

        /* Horizontal, no crossing */
        p.x = -0.5;
        p.y = 2.0;
        ptarray_set_point4d(pa22, 0, &p);
        p.x = 0.5;
        ptarray_set_point4d(pa22, 1, &p);

        CU_ASSERT( lwline_crossing_direction(l21, l22) == LINE_NO_CROSS );

        /* Vertical, no crossing */
        p.x = -0.5;
        p.y = 0.0;
        ptarray_set_point4d(pa22, 0, &p);
        p.y = 1.0;
        ptarray_set_point4d(pa22, 1, &p);

        CU_ASSERT( lwline_crossing_direction(l21, l22) == LINE_NO_CROSS );

}

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