fixed langton ant for resoltuions with width!=height (my fault), also
removed those annoying 45° vectors
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22f14abb32
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@ -35,27 +35,20 @@
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#define NX (UNUM_COLS - 1u)
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#define NY (UNUM_ROWS - 1u)
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#if UNUM_ROWS == UNUM_COLS
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static coord_t const dcomp[] = {0, P, NX};
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#define xdcomp dcomp
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#define ydcomp dcomp
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#else
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static coord_t const xdcomp[] = {0, P, NX};
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static coord_t const ydcomp[] = {0, P, NY};
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#endif
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static coord_t const xdcomp[] = {0, P, 0, NX};
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static coord_t const ydcomp[] = {P, 0, NY, 0};
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typedef struct ant_s {
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coord_t x, y;
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coord_t ox, oy; /* Used to set old pixels to brightness 2 */
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unsigned char vector_index;
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} ant_t;
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void ltn_ant() {
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clear_screen(0);
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struct {
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coord_t x, y;
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coord_t ox, oy; /* Used to set old pixels to brightness 2 */
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coord_t dx, dy; /* Vector can only be (0,1),(1,0),(0,-1),(-1,0) */
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} ant;
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unsigned char temp;
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ant_t ant;
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unsigned int cycles = 500;
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/* Random start position and direction */
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@ -63,10 +56,7 @@ void ltn_ant() {
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ant.y = random8() % UNUM_ROWS;
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/* Make sure we do have a valid vector */
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ant.dx = xdcomp[random8() % 3];
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do {
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ant.dy = ydcomp[random8() % 3];
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} while(ant.dx == ant.dy);
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ant.vector_index = random8() % 4u;
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ant.ox = ant.x;
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ant.oy = ant.y;
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@ -76,9 +66,8 @@ void ltn_ant() {
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if(get_pixel((pixel) {ant.x, ant.y}) == 0) {
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setpixel((pixel) {ant.x, ant.y}, 3);
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temp = ant.dx;
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ant.dx = ant.dy;
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ant.dy = -temp; /* Turn 90 degrees to the right */
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// turn right
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ant.vector_index = (ant.vector_index + 1u) % 8u;
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/* Lets the last pixel be darker than the latest */
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if((ant.ox != ant.x) || (ant.oy != ant.y))
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@ -86,20 +75,17 @@ void ltn_ant() {
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ant.ox = ant.x;
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ant.oy = ant.y;
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} else {
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setpixel((pixel) {ant.x, ant.y}, 0);
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temp = ant.dy;
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ant.dy = ant.dx;
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ant.dx = -temp; /* Turn 90 degrees to the left */
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// turn left
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ant.vector_index = (ant.vector_index + 3u) % 8u;
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}
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wait(100);
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/* Playing field is modeled after a torus */
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ant.x = (coord_t)(ant.x + ant.dx) % UNUM_COLS;
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ant.y = (coord_t)(ant.y + ant.dy) % UNUM_ROWS;
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ant.x = (coord_t)(ant.x + xdcomp[ant.vector_index]) % UNUM_COLS;
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ant.y = (coord_t)(ant.y + ydcomp[ant.vector_index]) % UNUM_ROWS;
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cycles--;
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}
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