void refresh_draw(int signum)
{
signal(SIGALRM, SIG_IGN);
baffle_move(signum);
ball_move(signum);
signal(SIGALRM, refresh_draw);
}
void game_tick(Game *game) {
int ch = 0, move_result = BALL_MOVED;
long elapsed = elapsed_since(&game->start_time);
static long last_event = 0;
if ((elapsed - last_event) >= (BALL_DELAY * MICROSECONDS_PER_SECOND)) {
move_result = ball_move(game->ball, game->field, game->player);
if (move_result == BALL_SCORE) {
game->player->score += 1;
} else if (move_result == BALL_MISS) {
game->player->score = 0;
ball_reset(game->ball, game->field);
}
last_event = elapsed;
}
if ((ch = getch()) != ERR) {
if (ch == MOVE_UP) {
player_move(game->field, game->player, -1);
}
if (ch == MOVE_DOWN) {
player_move(game->field, game->player, 1);
}
}
// field_refresh(game->field);
field_redraw(game->field);
wclear(game->field->game);
field_draw_score(game->field, game->player);
wrefresh(game->field->score);
player_draw(game->player, game->field);
ball_draw(game->ball, game->field);
wrefresh(game->field->game);
}
int pong_game_tick(struct pong_game *g, int cmd[2]) {
player_move(&g->players[0], cmd[0], g->grid.height);
player_move(&g->players[1], cmd[1], g->grid.height);
ball_move(&g->ball);
ball_hits_player(&g->ball, &g->players[0]);
ball_hits_player(&g->ball, &g->players[1]);
switch (ball_hits_wall(&g->ball, g->grid)) {
case -1:
g->players[1].score++;
g->ball.pos = g->ball.init;
break;
case 1:
g->players[0].score++;
g->ball.pos = g->ball.init;
break;
default:
return 0;
}
if (g->players[0].score >= g->target_score)
return -1;
if (g->players[1].score >= g->target_score)
return 1;
return 0;
}
static void collision(int ball0, int ball1, int winWidth, int winHeight)
{
int mode, i;
float x[2],y[2],r[2];
T_SPEED s[2], cs[2];
double xx,yy,rr,cx,px,cy,py,xc,xp,yc,yp,tmp;
r[0] = ball_getRadius(ballArray[ball0]);
r[1] = ball_getRadius(ballArray[ball1]);
ball_getPos(ballArray[ball0], &(x[0]), &(y[0]));
ball_getPos(ballArray[ball1], &(x[1]), &(y[1]));
s[0] = ball_getSpeed(ballArray[ball0]);
s[1] = ball_getSpeed(ballArray[ball1]);
xx = abs(x[0] - x[1]);
yy = abs(y[0] - y[1]);
rr = pow(xx*xx+yy*yy,0.5);
if ((x[0]-x[1]>0 && y[0]-y[1]>0)
|| (x[0]-x[1]<0 && y[0]-y[1]<0))
mode = 1;
else
mode = -1;
//transform to collision coordinate system
for(i=0; i<2; i++)
{
cx = xx*s[i].xSpeed/rr;
cy = mode*yy*s[i].ySpeed/rr;
px = yy*s[i].xSpeed/rr;
py = -mode*xx*s[i].ySpeed/rr;
cs[i].xSpeed = cx + cy;
cs[i].ySpeed = px + py;
}
//exchange collision speed
tmp = cs[0].xSpeed;
cs[0].xSpeed = cs[1].xSpeed;
cs[1].xSpeed = tmp;
//transform to normal coordinate system
for(i=0; i<2; i++)
{
xc = xx*cs[i].xSpeed/rr;
xp = yy*cs[i].ySpeed/rr;
yc = mode*yy*cs[i].xSpeed/rr;
yp = -mode*xx*cs[i].ySpeed/rr;
s[i].xSpeed = xc + xp;
s[i].ySpeed = yc + yp;
}
//set new speed
ball_setSpeed(ballArray[ball0], s[0]);
ball_setSpeed(ballArray[ball1], s[1]);
//To avoid dead loop
i = 0;
while(rr<r[0]+r[1] && i<6)
{
ball_move(ballArray[ball0], winWidth, winHeight);
ball_move(ballArray[ball1], winWidth, winHeight);
r[0] = ball_getRadius(ballArray[ball0]);
r[1] = ball_getRadius(ballArray[ball1]);
ball_getPos(ballArray[ball0], &(x[0]), &(y[0]));
ball_getPos(ballArray[ball1], &(x[1]), &(y[1]));
xx = abs(x[0] - x[1]);
yy = abs(y[0] - y[1]);
rr = pow(xx*xx+yy*yy,0.5);
i++;
}
}
static void collision(int ball0, int ball1, int winWidth, int winHeight)
{
int mode, i;
float x[2],y[2],r[2];
T_SPEED s[2], cs, ps;
double xx,yy,rr,cs0,ps0,cs1,ps1,cx0,cx1,px0,px1,cy0,cy1,py0,py1,tmp;
r[0] = ball_getRadius(ballArray[ball0]);
r[1] = ball_getRadius(ballArray[ball1]);
ball_getPos(ballArray[ball0], &(x[0]), &(y[0]));
ball_getPos(ballArray[ball1], &(x[1]), &(y[1]));
s[0] = ball_getSpeed(ballArray[ball0]);
s[1] = ball_getSpeed(ballArray[ball1]);
xx = abs(x[0] - x[1]);
yy = abs(y[0] - y[1]);
//printf("pow(%f,0.5)", xx*xx+yy*yy);
rr = pow(xx*xx+yy*yy,0.5);
if ((x[0]-x[1]>0 && y[0]-y[1]>0)
|| (x[0]-x[1]<0 && y[0]-y[1]<0))
mode = 0;
else
mode = 1;
//transform to collision coordinate system
//caculate ball0
cx0 = xx*s[0].xSpeed/rr;
if (mode)
{
px0 = yy*s[0].xSpeed/rr;
cy0 = -yy*s[0].ySpeed/rr;
}
else
{
px0 = -yy*s[0].xSpeed/rr;
cy0 = yy*s[0].ySpeed/rr;
}
py0 = xx*s[0].ySpeed/rr;
cs0 = cx0 + cy0;
ps0 = px0 + py0;
//caculate ball1
cx1 = xx*s[1].xSpeed/rr;
if (mode)
{
px1 = yy*s[1].xSpeed/rr;
cy1 = -yy*s[1].ySpeed/rr;
}
else
{
px1 = -yy*s[1].xSpeed/rr;
cy1 = yy*s[1].ySpeed/rr;
}
py1 = xx*s[1].ySpeed/rr;
cs1 = cx1 + cy1;
ps1 = px1 + py1;
//exchange collision speed
tmp = cs0;
cs0 = cs1;
cs1 = tmp;
//transform to normal coordinate system
//caculate ball0
if (mode)
{
cs.xSpeed = xx*cs0/rr;
cs.ySpeed = -yy*cs0/rr;
ps.xSpeed = yy*ps0/rr;
ps.ySpeed = xx*ps0/rr;
}
else
{
cs.xSpeed = xx*cs0/rr;
cs.ySpeed = yy*cs0/rr;
ps.xSpeed = -yy*ps0/rr;
ps.ySpeed = xx*ps0/rr;
}
s[0].xSpeed = cs.xSpeed + ps.xSpeed;
s[0].ySpeed = cs.ySpeed + ps.ySpeed;
ball_setSpeed(ballArray[ball0], s[0]);
//caculate ball1
if (mode)
{
cs.xSpeed = xx*cs1/rr;
cs.ySpeed = -yy*cs1/rr;
ps.xSpeed = yy*ps1/rr;
ps.ySpeed = xx*ps1/rr;
}
else
{
cs.xSpeed = xx*cs1/rr;
cs.ySpeed = yy*cs1/rr;
ps.xSpeed = -yy*ps1/rr;
ps.ySpeed = xx*ps1/rr;
}
s[1].xSpeed = cs.xSpeed + ps.xSpeed;
s[1].ySpeed = cs.ySpeed + ps.ySpeed;
ball_setSpeed(ballArray[ball1], s[1]);
//To avoid dead loop
i = 0;
while(rr<r[0]+r[1] && i<10)
{
ball_move(ballArray[ball0], winWidth, winHeight);
ball_move(ballArray[ball1], winWidth, winHeight);
r[0] = ball_getRadius(ballArray[ball0]);
r[1] = ball_getRadius(ballArray[ball1]);
ball_getPos(ballArray[ball0], &(x[0]), &(y[0]));
ball_getPos(ballArray[ball1], &(x[1]), &(y[1]));
xx = abs(x[0] - x[1]);
yy = abs(y[0] - y[1]);
//printf("2.pow(%f,0.5)", xx*xx+yy*yy);
rr = pow(xx*xx+yy*yy,0.5);
//printf("Adjustin collision position,rr=%d,r[0]=%d,r[1]=%d,x[0]=%d,x[1]=%d,y[0]=%d,y[1]=%d.\r\n",(int)rr,r[0],r[1],x[0],x[1],y[0],y[1]);
i++;
}
//printf("Collision[%d,%d]...\r\n",ball0,ball1);
}
//refresh ball status according to speed
void ball_refresh(T_BALL *pBall, cairo_t *pCR, int winWidth, int winHeight)
{
ball_move(pBall, winWidth, winHeight);
ball_show(pBall, pCR);
}
int wait_event(SDL_Renderer *renderer)
{
bool quit;
int y_p1;
int y_p2;
SDL_Event event;
SDL_Rect raq_p1;
SDL_Rect raq_p2;
SDL_Rect ball;
SDL_Rect bold;
quit = false;
init_ball(&ball, &bold);
y_p1 = 240;
y_p2 = 240;
while (!quit)
{
printf("x");
SDL_Delay(2);
SDL_PollEvent(&event);
switch (event.type)
{
case SDL_KEYDOWN:
switch(event.key.keysym.sym)
{
case SDLK_ESCAPE:
{
quit = true;
return (0);
}
case SDLK_UP:
{
if (y_p1 > 0)
y_p1--;
else
break;
break;
}
case SDLK_DOWN:
{
if (y_p1 < 480 - 64)
y_p1++;
else
break;
break;
}
case SDLK_LEFT:
{
if (y_p2 < 480 - 64)
y_p2++;
else
break;
break;
}
case SDLK_RIGHT:
{
if (y_p2 > 0)
y_p2--; else
break;
break;
}
}
break;
}
pos_raq_p1(&raq_p1, &y_p1);
pos_raq_p2(&raq_p2, &y_p2);
ball_move(&ball, &bold, &raq_p1, &raq_p2);
print_game(renderer, &raq_p1, &raq_p2, &ball);
}
}