/**
* Sets the seencells bit for all cells of a segment
*
* @param seg
*/
private void udpateSeenCellsForSegment(Seg seg) {
seg.seen = true; // updates the segment
int sdx = seg.dx / map_unit; // constant, only set once here
int sdy = seg.dy / map_unit; // constant, only set once here
// get initial position right on loop variables sx, sy
int sx = seg.x / map_unit;
if (sdx < 0) sx--;
int sy = seg.y / map_unit;
if (sdy < 0) sy--;
// define constants to avoid method calls in following loop
int sdsx = MazeBuilder.getSign(sdx);
int sdsy = MazeBuilder.getSign(sdy);
int bit = (sdx != 0) ? Cells.CW_TOP : Cells.CW_LEFT;
int len = Math.abs(sdx + sdy);
// true loop variables are (sx,sy),
for (int i = 0; i != len; i++) {
// seencells[sx][sy] |= bit;
seencells.setBitToOne(sx, sy, bit); // updates the cell
sx += sdsx;
sy += sdsy;
}
}
