tetrise kontroll

bool block::checker(int nxloc, int xyloc, const* screen, int deltad = 0){
    if ((dir+deltad)==0 && (xloc+dist_right)<xlen &&
    (xloc-dist_left)>=0 && (yloc+dist_down)>=0){
        for (int y=0;y<5;y++){
            for (int x=0;x<5;x++){
                int absx = (xloc+x)-3;
                int absy = (yloc+y)-3;
                if (blueprint[y][x] && screen[absy][absx] == staticTetrimino){
                    return false;
                }
            }
        }
    } else if ((dir+deltad)==1 && (xloc+dist_up)<xlen &&
    (xloc-dist_down)>=0 && (yloc+dist_right)>=0){
        for (int y=0;y<5;y++){
            for (int x=0;x<5;x++){
                int absx = (xloc+x)-3;
                int absy = (yloc+y)-3;
                if (blueprint[x][5-y] && screen[absy][absx] == staticTetrimino){
                    return false;
                }
            }
        }
    } else if ((dir+deltad)==2 && (xloc+dist_left)<xlen &&
    (xloc-dist_right)>=0 && (yloc+dist_up)>=0){
        for (int y=0;y<5;y++){
            for (int x=0;x<5;x++){
                int absx = (xloc+x)-3;
                int absy = (yloc+y)-3;
                if (blueprint[5-y][5-x] && screen[absy][absx] == staticTetrimino){
                    return false;
                }
            }
        }
    } else if ((dir+deltad)==3 && (xloc+dist_down)<xlen &&
    (xloc-dist_up)>=0 && (yloc+dist_left)>=0){
        for (int y=0;y<5;y++){
            for (int x=0;x<5;x++){
                int absx = (xloc+x)-3;
                int absy = (yloc+y)-3;
                if (blueprint[5-x][5-y] && screen[absy][absx] == staticTetrimino){
                    return false;
                }
            }
        }
    }
    return true;
}