SDL-mirror/test/automated/rect/rect.c

/**
 * Automated SDL rect test.
 *
 * Written by Edgar Simo "bobbens"
 *
 * Released under Public Domain.
 */




#include "SDL_rect.h"
#include "../SDL_at.h"


/*
 * Prototypes.
 */
static void rect_testIntersectRectAndLine (void);


/**
 * @brief Tests SDL_IntersectRectAndLine()
 */
static void rect_testIntersectRectAndLine (void)
{
    SDL_Rect rect = { 0, 0, 32, 32 };
    int x1, y1;
    int x2, y2;
    SDL_bool clipped;

    SDL_ATbegin( "IntersectRectAndLine" );

    x1 = -10;
    y1 = 0;
    x2 = -10;
    y2 = 31;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( !clipped &&
                   x1 == -10 && y1 == 0 && x2 == -10 && y2 == 31,
        "line outside to the left was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = 40;
    y1 = 0;
    x2 = 40;
    y2 = 31;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( !clipped &&
                   x1 == 40 && y1 == 0 && x2 == 40 && y2 == 31,
        "line outside to the right was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = 0;
    y1 = -10;
    x2 = 31;
    y2 = -10;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( !clipped &&
                   x1 == 0 && y1 == -10 && x2 == 31 && y2 == -10,
        "line outside above was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = 0;
    y1 = 40;
    x2 = 31;
    y2 = 40;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( !clipped &&
                   x1 == 0 && y1 == 40 && x2 == 31 && y2 == 40,
        "line outside below was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = 0;
    y1 = 0;
    x2 = 31;
    y2 = 31;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( clipped &&
                   x1 == 0 && y1 == 0 && x2 == 31 && y2 == 31,
        "line fully inside rect was clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = -10;
    y1 = 15;
    x2 = 40;
    y2 = 15;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( clipped &&
                   x1 == 0 && y1 == 15 && x2 == 31 && y2 == 15,
        "horizontal line rect was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = -32;
    y1 = -32;
    x2 = 63;
    y2 = 63;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( clipped &&
                   x1 == 0 && y1 == 0 && x2 == 31 && y2 == 31,
        "diagonal line to lower right was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = 63;
    y1 = 63;
    x2 = -32;
    y2 = -32;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( clipped &&
                   x1 == 31 && y1 == 31 && x2 == 0 && y2 == 0,
        "diagonal line to upper left was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = 63;
    y1 = -32;
    x2 = -32;
    y2 = 63;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( clipped &&
                   x1 == 31 && y1 == 0 && x2 == 0 && y2 == 31,
        "diagonal line to lower left was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    x1 = -32;
    y1 = 63;
    x2 = 63;
    y2 = -32;
    clipped = SDL_IntersectRectAndLine(&rect, &x1, &y1, &x2, &y2);
    SDL_ATvassert( clipped &&
                   x1 == 0 && y1 == 31 && x2 == 31 && y2 == 0,
        "diagonal line to upper right was incorrectly clipped: %d,%d - %d,%d",
        x1, y1, x2, y2);

    SDL_ATend();
}


/**
 * @brief Rect test entrypoint.
 */
#ifdef TEST_STANDALONE
int main( int argc, const char *argv[] )
{
   (void) argc;
   (void) argv;
#else /* TEST_STANDALONE */
int test_rect (void)
{
#endif /* TEST_STANDALONE */

   SDL_ATinit( "Rect" );

   rect_testIntersectRectAndLine();

   return SDL_ATfinish();
}