130 lines
2.5 KiB
C
130 lines
2.5 KiB
C
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#include "../config.h"
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#include "../pixel.h"
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#include "../util.h"
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#include "../random/prng.h"
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#include "snake.h"
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#define RANDOM8() (random8())
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void snake(){
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pixel pixels[64];
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pixels[0] = (pixel){NUM_COLS/2, NUM_ROWS/2};
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pixels[1] = (pixel){NUM_COLS/2, (NUM_ROWS/2)-1};
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pixel * head = &pixels[1];
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pixel * tail = &pixels[0];
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pixel old_head;
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pixel apples[10];
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unsigned char apple_num = 0;
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direction dir = up;
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clear_screen(0);
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unsigned char x=0, dead=0;
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while(1){
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x++;
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old_head = *head;
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if(++head == pixels + 64) head = pixels;
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unsigned char dead_cnt=0;
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unsigned char apple_found = 0, j;
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for(j=0;j<apple_num;j++){
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unsigned char i;
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for(i=0;i<4;i++){
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if ( (next_pixel(old_head, i).x == apples[j].x) && (next_pixel(old_head, i).y == apples[j].y) ){
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apple_found = 1;
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dir = i;
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for(;j<apple_num-1;j++){
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apples[j]=apples[j+1];
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}
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apple_num--;
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goto apple_se;
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}
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}
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}
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apple_se:
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if(apple_found){
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}else{
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while(get_next_pixel(old_head, dir)){
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if((dead_cnt++)==4){
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dead = 1;
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break;
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}
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dir = direction_r(dir);
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}
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}
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if(!dead){
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*head = next_pixel(old_head, dir);
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setpixel(*head, 3);
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if((RANDOM8()&0xff)<80){
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unsigned char j;
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unsigned char nextapple=0, distx, disty, shortdist=255, xy=0;
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if(!apple_num){
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dir = RANDOM8()%4;
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}else{
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for(j=0;j<apple_num;j++){
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if(head->x > apples[j].x){
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distx = head->x - apples[j].x;
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}else{
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distx = apples[j].x - head->x;
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}
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if(head->y > apples[j].y){
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disty = head->y - apples[j].y;
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}else{
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disty = apples[j].y - head->y;
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}
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if ((distx + disty) < shortdist){
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shortdist = distx + disty;
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nextapple = j;
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xy = (distx > disty)?1:0;
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}
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}
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if(xy){
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dir = (apples[nextapple].x > head->x)?left:right;
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}else{
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dir = (apples[nextapple].y > head->y)?down:up;
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}
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}
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}
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if( (apple_num<9) && ((RANDOM8()&0xff)<10) ){
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pixel new_apple = (pixel){RANDOM8()%NUM_COLS,RANDOM8()%NUM_ROWS};
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if(!get_pixel(new_apple)){
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apples[apple_num++]=new_apple;
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}
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}
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if(!apple_found){
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clearpixel(*tail);
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if(++tail == pixels + 64) tail = pixels;
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}
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}else{
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while(tail != head){
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clearpixel(*tail);
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if((++tail)>pixels+64) tail = pixels;
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wait (60);
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}
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break;
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}
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for(j=0;j<apple_num;j++){
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if(x%2){
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setpixel(apples[j], 3);
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}else{
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clearpixel(apples[j]);
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}
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}
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wait (SNAKE_DELAY);
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}
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}
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