public void setWireEnumerator(WireEnumerator we){
this.we = we;
}
public void drawWire(Tile src, Tile dst){
QGraphicsLineItem line = new QGraphicsLineItem(
src.getColumn()*tileSize + tileSize/2,
src.getRow()*tileSize + tileSize/2,
dst.getColumn()*tileSize + tileSize/2,
dst.getRow()*tileSize + tileSize/2);
line.setPen(wirePen);
addItem(line);
}