playgrid_legal move_player(playgrid_direction direction, int x_new, int y_new, PlayGrid* grid, Square_list* updated){
playgrid_object new_object; //object at new square
new_object = get_Playgrid_object(x_new,y_new,grid);
//is the new square legal to move to
switch(new_object){
case ROCK://try to move the rock
if(ILLEGAL == move_object(x_new, y_new, direction, grid, updated) ){
return ILLEGAL;
}
break;
case EMPTY://EMPTY is fine
break;
default:
return ILLEGAL;
break;
}
//everything seems fine, move player
update_square( grid, EMPTY,grid->player_x, grid->player_y, updated);
update_square( grid, PLAYER,x_new, y_new, updated);
return LEGAL;
}
playgrid_legal move_rock(int x,int y, int x_new, int y_new, PlayGrid* grid, Square_list* updated){
playgrid_object new_object; //object at new square
//is there already a rock at the new square?
new_object = get_Playgrid_object(x_new,y_new,grid);
switch(new_object){
case ROCK:
return ILLEGAL;
break;
case EMPTY:
//move object:
break;
default:
return ILLEGAL;
break;
}
//everything seems fine, move rock
update_square( grid, EMPTY,x, y, updated);
update_square( grid, ROCK,x_new, y_new, updated);
return LEGAL;
}
// Attempts to update the owners of all squares that a new line
// might affect. Returns true if one or more squares receives a
// new owner.
static bool update_squares()
{
bool lt = update_square(LeftTop), rt = update_square(RightTop),
lb = update_square(LeftBottom), rb = update_square(RightBottom);
return lt || rt || lb || rb;
}