Function clear_path

src/vision.c:1612–1636

* Use vision tables to determine if there is a clear path from * (col1,row1) to (col2,row2). This is used by: * m_cansee() * m_canseeu() * do_light_sources() */

 *      do_light_sources()
 */
boolean
clear_path(int col1, int row1, int col2, int row2)
{
    int result;

    if (col1 < col2) {
        if (row1 > row2) {
            q1_path(row1, col1, row2, col2, cleardone);
        } else {
            q4_path(row1, col1, row2, col2, cleardone);
        }
    } else {
        if (row1 > row2) {
            q2_path(row1, col1, row2, col2, cleardone);
        } else if (row1 == row2 && col1 == col2) {
            result = 1;
        } else {
            q3_path(row1, col1, row2, col2, cleardone);
        }
    }
#ifdef MACRO_CPATH
 cleardone:
#endif
    return (boolean) result;
}

/*==========================================================================*\
                            GENERAL LINE OF SIGHT