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saved 38 bytes

This commit is contained in:
Christian Kroll 2011-09-02 16:47:46 +00:00
parent bd99f557b8
commit 041bae2942
1 changed files with 28 additions and 30 deletions
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52
animations/ltn_ant.c
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@ -25,33 +25,35 @@
#include "../util.h" #include "../util.h"
#include "../random/prng.h" #include "../random/prng.h"
void ltn_ant() { void ltn_ant() {
clear_screen(0); clear_screen(0);
struct { struct {
char x , y; unsigned char x, y;
char dx, dy; /* Vector can only be: (0,1),(1,0),(0,-1),(-1,0) */ unsigned char ox, oy; /* Used to set old pixels so brightness 2 */
char ox, oy; /* Used to set old pixels so brightness 2 */ signed char dx, dy; /* Vector can only be (0,1),(1,0),(0,-1),(-1,0) */
} ant; } ant;
char temp, i = 0; signed char temp;
uint16_t cycles = 500; unsigned int cycles = 500;
/* Random startposition and direction */ /* Random start position and direction */
ant.x = random8() % NUM_COLS; ant.x = random8() % NUM_COLS;
ant.y = random8() % NUM_ROWS; ant.y = random8() % NUM_ROWS;
/* Make sure we do have a valid vector */ /* Make sure we do have a valid vector */
ant.dx = (random8() % 3) - 1;
do { do {
ant.dx = (random8() % 3) - 1;
ant.dy = (random8() % 3) - 1; ant.dy = (random8() % 3) - 1;
} while(ant.dx == ant.dy); } while(ant.dx == ant.dy);
ant.ox = 0; ant.ox = ant.x;
ant.oy = 0; ant.oy = ant.y;
while(cycles != 0) { while(cycles != 0) {
if(get_pixel((pixel) {ant.x, ant.y}) == 0) { /* If the pixel is not set turn it on */ /* If the pixel is not set turn it on */
if(get_pixel((pixel) {ant.x, ant.y}) == 0) {
setpixel((pixel) {ant.x, ant.y}, 3); setpixel((pixel) {ant.x, ant.y}, 3);
temp = ant.dx; temp = ant.dx;
@ -59,10 +61,9 @@ void ltn_ant() {
ant.dy = -temp; /* Turn 90 degrees to the right */ ant.dy = -temp; /* Turn 90 degrees to the right */
/* Lets the last pixel be darker than the latest */ /* Lets the last pixel be darker than the latest */
if(i == 1) if((ant.ox != ant.x) || (ant.oy != ant.y))
setpixel((pixel) {ant.ox, ant.oy}, 2); setpixel((pixel) {ant.ox, ant.oy}, 2);
else
i = 1;
ant.ox = ant.x; ant.ox = ant.x;
ant.oy = ant.y; ant.oy = ant.y;
@ -76,21 +77,18 @@ void ltn_ant() {
wait(100); wait(100);
ant.x += ant.dx; /* Playing field is modeled after a torus */
ant.y += ant.dy; if(ant.x == 0 && ant.dx < 0)
ant.x = NUM_COLS - 1;
else
ant.x = (ant.x + ant.dx) % UNUM_COLS;
/* The ant will appear on the oppisite side of the field if it would leave */ if(ant.y == 0 && ant.dy < 0)
if(ant.x <= 0) ant.y = NUM_ROWS - 1;
ant.x += (NUM_ROWS - 1); else
if(ant.x >= NUM_ROWS) ant.y = (ant.y + ant.dy) % UNUM_ROWS;
ant.x -= (NUM_ROWS + 1);
if(ant.y <= 0)
ant.y += (NUM_COLS - 1);
if(ant.y >= NUM_COLS)
ant.y -= (NUM_COLS + 1);
cycles--; cycles--;
} }
wait(300); wait(300);
} }