improve anaconda.c
make some changes to anaconda: -> fix memory leaks -> add tabs instead of spaces -> show score on screen -> adapt to different screen sizes
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parent
d37e632bd8
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6b5d621820
297
c/anaconda.c
297
c/anaconda.c
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@ -8,15 +8,15 @@
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#include <X11/Xlib.h>
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typedef struct point {
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double x;
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double y;
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struct point *next;
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double x;
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double y;
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struct point *next;
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} point;
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typedef struct anaconda {
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int score;
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double rot;
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struct point *chain;
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int score;
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double rot;
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struct point *chain;
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} anaconda;
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Display *d;
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@ -26,13 +26,13 @@ int s;
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GC gc;
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void xinit(void) {
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d = XOpenDisplay(NULL);
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s = DefaultScreen(d);
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w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1,
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BlackPixel(d, s), WhitePixel(d, s));
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XSelectInput(d, w, ExposureMask | KeyPressMask | PointerMotionMask);
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XMapWindow(d, w);
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gc = XCreateGC(d, w, 0, NULL);
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d = XOpenDisplay(NULL);
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s = DefaultScreen(d);
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w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1,
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BlackPixel(d, s), WhitePixel(d, s));
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XSelectInput(d, w, ExposureMask | KeyPressMask | PointerMotionMask);
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XMapWindow(d, w);
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gc = XCreateGC(d, w, 0, NULL);
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}
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/* thanks to
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@ -41,162 +41,207 @@ void xinit(void) {
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*/
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int ccw(point *a, point *b, point *c) {
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return (c->y - a->y) * (b->x - a->x) >
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(b->y - a->y) * (c->x - a->x);
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return (c->y - a->y) * (b->x - a->x) >
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(b->y - a->y) * (c->x - a->x);
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}
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int intersect(point *a, point *b, point *c, point *d) {
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return (ccw(a, c, d) != ccw(b, c, d)) && (ccw(a, b, c) != ccw(a, b, d));
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return (ccw(a, c, d) != ccw(b, c, d)) && (ccw(a, b, c) != ccw(a, b, d));
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}
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int randrange(int b, int s) {
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return rand() % (b - s + 1) + s;
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return rand() % (b - s + 1) + s;
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}
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int eucliddist(point *a, point *b) {
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return sqrt(pow(a->x - b->x, 2) + pow(a->y - b->y, 2));
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return sqrt(pow(a->x - b->x, 2) + pow(a->y - b->y, 2));
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}
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point *mkPoint(double x, double y) {
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point *ret = malloc(sizeof *ret);
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point *ret = malloc(sizeof *ret);
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ret->x = x;
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ret->y = y;
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ret->next = NULL;
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ret->x = x;
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ret->y = y;
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ret->next = NULL;
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return ret;
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return ret;
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}
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point *rotate(point *p, double rot) {
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double rad = rot * M_PI/180;
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double rad = rot * M_PI/180;
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return mkPoint(
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p->x * cos(rad) - p->y * sin(rad),
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p->x * sin(rad) + p->y * cos(rad)
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);
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return mkPoint(
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p->x * cos(rad) - p->y * sin(rad),
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p->x * sin(rad) + p->y * cos(rad)
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);
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}
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void appendPoint(point *dest, point *origin) {
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while(dest->next) dest = dest->next;
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dest->next = origin;
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while(dest->next) dest = dest->next;
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dest->next = origin;
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}
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int updateAnaconda(anaconda *anaconda, int w, int h, point *apple) {
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point *temp, *new, *ptr;
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new = anaconda->chain;
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temp = rotate(mkPoint(10, 0), anaconda->rot);
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new = mkPoint(
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new->x + temp->x,
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new->y + temp->y
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);
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new->next = anaconda->chain;
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anaconda->chain = new;
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int updateAnaconda(anaconda *anaconda, point *basepoint, int w, int h, point *apple) {
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point *temp, *new, *ptr;
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new = anaconda->chain;
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free(temp);
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temp = rotate(basepoint, anaconda->rot);
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new = mkPoint(
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new->x + temp->x,
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new->y + temp->y
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);
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new->next = anaconda->chain;
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anaconda->chain = new;
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if(eucliddist(new, apple) <= 30) {
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anaconda->score += 30;
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apple->x = randrange(20, w / 2);
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apple->y = randrange(20, h / 2);
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} else {
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ptr = new;
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free(temp);
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while(1) {
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if(ptr->next) {
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if(ptr->next->next) ptr = ptr->next;
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else break;
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} else break;
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}
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free(ptr->next);
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ptr->next = NULL;
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}
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if(eucliddist(new, apple) <= 30) {
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anaconda->score += 30;
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apple->x = randrange(20, w / 2);
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apple->y = randrange(20, h / 2);
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} else {
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ptr = new;
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ptr = anaconda->chain;
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for(int i = 0; i < 3; i++) {
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if(ptr->next) ptr = ptr->next;
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else return 1; /* we're fine, the snake is too short to intersect itself */
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}
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while(1) {
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if(ptr->next) {
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if(ptr->next->next) ptr = ptr->next;
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else break;
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} else break;
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}
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free(ptr->next);
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ptr->next = NULL;
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}
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while(ptr->next) {
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if(intersect(new, new->next, ptr, ptr->next)) return 0;
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ptr = ptr->next;
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}
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ptr = anaconda->chain;
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for(int i = 0; i < 3; i++) {
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if(ptr->next) ptr = ptr->next;
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else return 1; /* we're fine, the snake is too short to intersect itself */
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}
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if(
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new->x >= w || new->x <= 0 ||
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new->y >= h || new->y <= 0
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) return 0;
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while(ptr->next) {
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if(intersect(new, new->next, ptr, ptr->next)) return 0;
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ptr = ptr->next;
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}
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if(eucliddist(new, apple) <= 30) {
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anaconda->score += 30;
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apple->x = randrange(20, w / 2);
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apple->y = randrange(20, h / 2);
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}
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if(
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new->x >= w || new->x <= 0 ||
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new->y >= h || new->y <= 0
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) return 0;
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return 1;
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if(eucliddist(new, apple) <= 30) {
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anaconda->score += 30;
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apple->x = randrange(20, w / 2);
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apple->y = randrange(20, h / 2);
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}
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return 1;
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}
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void freeAnaconda(anaconda *anaconda) {
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point *current = anaconda->chain;
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point *next = NULL;
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for(;;) {
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if(!current) break;
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next = current->next;
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free(current);
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current = next;
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}
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free(anaconda);
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return;
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}
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point *generateChain(int length) {
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point *ret = mkPoint(100, 100);
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point *head = ret;
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point *ret = mkPoint(100, 100);
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point *head = ret;
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for(int i = 1; i < length - 1; i++) {
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ret->next = mkPoint(
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10 * i + 100,
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5 * i + 100
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);
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ret = ret->next;
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}
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for(int i = 1; i < length - 1; i++) {
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ret->next = mkPoint(
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10 * i + 100,
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5 * i + 100
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);
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ret = ret->next;
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}
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return head;
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return head;
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}
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anaconda *mkAnaconda(point *point, double rot) {
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anaconda *ret = malloc(sizeof *ret);
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anaconda *ret = malloc(sizeof *ret);
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ret->chain = point;
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ret->rot = rot;
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ret->score = 0;
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ret->chain = point;
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ret->rot = rot;
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ret->score = 0;
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return ret;
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return ret;
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}
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int main(void) {
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anaconda *anaconda = mkAnaconda(generateChain(30), 0);
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xinit();
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srand(time(0));
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int width = DisplayWidth(d, s);
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int height = DisplayHeight(d, s);
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point *apple = mkPoint(randrange(20, width / 2 - 20), randrange(20, height / 2 - 20));
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while(1) {
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if(!updateAnaconda(anaconda, width, height, apple)) {
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return 0;
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}
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XClearWindow(d, w);
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point *ptr = anaconda->chain;
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while(ptr->next) {
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XDrawLine(d, w, gc, ptr->x, ptr->y, ptr->next->x, ptr->next->y);
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ptr = ptr->next;
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}
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printf("%f %f\n", apple->x, apple->y);
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XDrawArc(d, w, gc, apple->x - (5/2), apple->y - (5/2), 5, 5, 0, 360*64);
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while(XPending(d)) {
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XNextEvent(d, &e);
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switch(e.type) {
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case KeyPress:
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switch(e.xkey.keycode) {
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case 113: /* left arrow key */
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anaconda->rot += 10;
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break;
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case 114: /* right arrow key */
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anaconda->rot -= 10;
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break;
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}
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break;
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}
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}
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usleep(100000);
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}
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anaconda *anaconda = mkAnaconda(generateChain(30), 0);
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point *basepoint = mkPoint(10, 0);
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char scorebuffer[30];
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xinit();
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srand(time(0));
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int width = DisplayWidth(d, s);
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int height = DisplayHeight(d, s);
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point *apple = mkPoint(randrange(20, width / 2 - 20), randrange(20, height / 2 - 20));
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int exposed = 0;
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while(1) {
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if(exposed) {
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if(!updateAnaconda(anaconda, basepoint, width, height, apple)) {
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freeAnaconda(anaconda);
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free(apple);
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free(basepoint);
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return 0;
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}
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XClearWindow(d, w);
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point *ptr = anaconda->chain;
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while(ptr->next) {
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XDrawLine(d, w, gc, ptr->x, ptr->y, ptr->next->x, ptr->next->y);
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ptr = ptr->next;
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}
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XDrawArc(d, w, gc, apple->x - (5/2), apple->y - (5/2), 5, 5, 0, 360*64);
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int len = snprintf(&scorebuffer, 30, "%i", anaconda->score);
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XDrawString(d, w, gc, 25, 25, &scorebuffer, len);
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}
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while(XPending(d)) {
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XNextEvent(d, &e);
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switch(e.type) {
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case KeyPress:
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switch(e.xkey.keycode) {
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case 113: /* left arrow key */
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anaconda->rot += 10;
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break;
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case 114: /* right arrow key */
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anaconda->rot -= 10;
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break;
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}
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break;
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case Expose:
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/* hold off drawing until we get an expose event */
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exposed = 1;
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return 0;
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width = e.xexpose.width;
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height = e.xexpose.height;
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if(apple->x > width) {
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free(apple);
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apple = mkPoint(randrange(20, width / 2 - 20), randrange(20, height / 2 - 20));
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} else if (apple->y > height) {
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free(apple);
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apple = mkPoint(randrange(20, width / 2 - 20), randrange(20, height / 2 - 20));
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}
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break;
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}
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}
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usleep(100000);
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}
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freeAnaconda(anaconda);
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free(apple);
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free(basepoint);
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return 0;
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}
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