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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 "../random/prng.h"
void ltn_ant() {
clear_screen(0);
struct {
char x , y;
char dx, dy; /* Vector can only be: (0,1),(1,0),(0,-1),(-1,0) */
char ox, oy; /* Used to set old pixels so brightness 2 */
unsigned char x, y;
unsigned 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;
char temp, i = 0;
uint16_t cycles = 500;
signed char temp;
unsigned int cycles = 500;
/* Random startposition and direction */
ant.x = random8() % NUM_COLS;
ant.y = random8() % NUM_ROWS;
/* Random start position and direction */
ant.x = random8() % NUM_COLS;
ant.y = random8() % NUM_ROWS;
/* Make sure we do have a valid vector */
ant.dx = (random8() % 3) - 1;
do {
ant.dx = (random8() % 3) - 1;
ant.dy = (random8() % 3) - 1;
} while(ant.dx == ant.dy);
ant.ox = 0;
ant.oy = 0;
ant.ox = ant.x;
ant.oy = ant.y;
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);
temp = ant.dx;
@ -59,10 +61,9 @@ void ltn_ant() {
ant.dy = -temp; /* Turn 90 degrees to the right */
/* 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);
else
i = 1;
ant.ox = ant.x;
ant.oy = ant.y;
@ -76,21 +77,18 @@ void ltn_ant() {
wait(100);
ant.x += ant.dx;
ant.y += ant.dy;
/* Playing field is modeled after a torus */
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.x <= 0)
ant.x += (NUM_ROWS - 1);
if(ant.x >= NUM_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);
if(ant.y == 0 && ant.dy < 0)
ant.y = NUM_ROWS - 1;
else
ant.y = (ant.y + ant.dy) % UNUM_ROWS;
cycles--;
}
wait(300);
}