void ball_move(int signum)
{
int y_cur, x_cur, moved;
signal( SIGALRM , SIG_IGN ); /* dont get caught now */
y_cur = the_ball.y_pos ; /* old spot */
x_cur = the_ball.x_pos ;
moved = 0 ;
if ( the_ball.y_ttm > 0 && the_ball.y_ttg-- == 1 ){
the_ball.y_pos += the_ball.y_dir ; /* move */
the_ball.y_ttg = the_ball.y_ttm ; /* reset*/
moved = 1;
}
if ( the_ball.x_ttm > 0 && the_ball.x_ttg-- == 1 ){
the_ball.x_pos += the_ball.x_dir ; /* move */
the_ball.x_ttg = the_ball.x_ttm ; /* reset*/
moved = 1;
}
if ( moved ){
mvaddch( y_cur, x_cur, BLANK );
mvaddch( y_cur, x_cur, BLANK );
mvaddch( the_ball.y_pos, the_ball.x_pos, the_ball.symbol );
bounce_or_lose( &the_ball );
move(LINES-1,COLS-1);
refresh();
}
signal( SIGALRM, ball_move); /* for unreliable systems */
}
void ball_move( int signum )
{
int y_cur, x_cur, moved;
signal( SIGALRM, SIG_IGN );
y_cur = the_ball.y_pos;
x_cur = the_ball.x_pos;
moved = 0;
if( the_ball.y_ttm > 0 && the_ball.y_ttg-- == 1 ) {
the_ball.y_pos += the_ball.y_dir;
the_ball.y_ttg = the_ball.y_ttm;
moved = 1;
}
if( the_ball.x_ttm > 0 && the_ball.x_ttg-- == 1 ) {
the_ball.x_pos += the_ball.x_dir;
the_ball.x_ttg = the_ball.x_ttm;
moved = 1;
}
if( moved ) {
mvaddch( y_cur, x_cur, BLANK );
mvaddch( y_cur, x_cur, BLANK );
mvaddch( the_ball.y_pos, the_ball.x_pos, the_ball.symbol );
bounce_or_lose( &the_ball );
move( LINES - 1, COLS - 1 );
refresh();
}
signal( SIGALRM, ball_move );
}
/*
* ball move handler
* First checks if ball has moved earlier so that we call
* bounce_or_loose only if ball moved.
* if moved checks if ball bounced or lost.
* bounce_or_loose is checked before moving the ball to ensure
* that correct state of paddle and ball has been compared.
* Otherwise if we move ball first and at the same time paddle
* is moved by pressing keyboard key by user we may loose paddle
* movement while ball_move is running because during ball_move
* SIGIO is blocked.
* moves ball when x/y ticker reaches 0.
* if moved resets x/y ticker otherwise decrements it.
* lost redraws ball at a new position
* notifies if ball lost.
* Return : void
*/
void ball_move(void)
{
int y_cur, x_cur;//x and y current position
//check bounce_or_lose() first before moving the ball
if( the_ball.m_moved && bounce_or_lose() == -1){//check if lost or bounced
ballLost();//notifies if ball lost
return;//return if ball lost
}
y_cur = the_ball.y_pos ; // old position
x_cur = the_ball.x_pos ;
the_ball.m_moved = 0 ;
if ( the_ball.y_ttm > 0 && the_ball.y_ttg-- == 1 ){//y movement
the_ball.y_pos += the_ball.y_dir ; // move
the_ball.y_ttg = the_ball.y_ttm ; // reset
the_ball.m_moved = 1;
}
if ( the_ball.x_ttm > 0 && the_ball.x_ttg-- == 1 ){//y movement
the_ball.x_pos += the_ball.x_dir ; // move
the_ball.x_ttg = the_ball.x_ttm ; // reset
the_ball.m_moved = 1;
}
if ( the_ball.m_moved ){//if ball moved
mvaddch( y_cur, x_cur, BLANK );//draw blank
mvaddch( the_ball.y_pos, the_ball.x_pos, the_ball.symbol );//redraw
move(LINES-1,COLS-1);//park cursor
refresh();//refresh screen
}
}
extern void b_move(int signum) {
signal(SIGALRM, SIG_IGN);
int x_org_pos = the_ball.x_pos,
y_org_pos = the_ball.y_pos;
bool ball_moved = false;
if (the_ball.x_ttm > 0 && the_ball.x_ttg-- == 1) {
the_ball.x_pos += the_ball.x_dir;
the_ball.x_ttg = the_ball.x_ttm;
ball_moved = true;
}
if (the_ball.y_ttm > 0 && the_ball.y_ttg-- == 1) {
the_ball.y_pos += the_ball.y_dir;
the_ball.y_ttg = the_ball.y_ttm;
ball_moved = true;
}
if (ball_moved == true) {
mvaddch(y_org_pos, x_org_pos, BLANK);
mvaddch(the_ball.y_pos, the_ball.x_pos, the_ball.symbol);
bounce_or_lose(&the_ball);
move(LINES - 1, COLS - 1);
}
if (the_bar.dir == BAR_UP && the_bar.top_y != TOP_EDGE) {
mvaddch(the_bar.top_y + the_bar.dir, RIGHT_EDGE, BAR_SYMBOL);
mvaddch(the_bar.bottom_y, RIGHT_EDGE, BLANK);
the_bar.top_y += the_bar.dir;
the_bar.bottom_y += the_bar.dir;
}
if (the_bar.dir == BAR_DOWN && the_bar.bottom_y != BOTTOM_EDGE) {
mvaddch(the_bar.top_y, RIGHT_EDGE, BLANK);
mvaddch(the_bar.bottom_y + the_bar.dir, RIGHT_EDGE, BAR_SYMBOL);
the_bar.top_y += the_bar.dir;
the_bar.bottom_y += the_bar.dir;
}
if (ball_moved || the_bar.dir != BAR_STOP) {
refresh();
the_bar.dir = BAR_STOP;
}
signal(SIGALRM, b_move);
}
