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/*
* Copyright (C) 2000-2022 The Exult Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "Zombie.h"
#include "ignore_unused_variable_warning.h"
/*
* Figure 'dir' (1 or -1) and abs. value of 'delta'.
*/
inline void Figure_dir(long delta, unsigned int& abs_delta, int& dir) {
if (delta >= 0) {
dir = 1;
abs_delta = delta;
} else {
dir = -1;
abs_delta = -delta;
}
}
/*
* Find path from source to destination.
*
* Output: true if successful, else false.
*/
bool Zombie::NewPath(
const Tile_coord& s, const Tile_coord& d,
const Pathfinder_client* client) {
ignore_unused_variable_warning(client);
src = s; // Store start, destination.
dest = d;
cur = s; // Get current coords.
sum1 = sum2 = 0; // Clear accumulators.
const long deltax = Tile_coord::delta(cur.tx, dest.tx);
const long deltay = Tile_coord::delta(cur.ty, dest.ty);
const long deltaz = Tile_coord::delta(cur.tz, dest.tz);
if (!deltax && !deltay && !deltaz) { // Going nowhere?
major_distance = 0;
return false;
}
unsigned int abs_deltax;
unsigned int abs_deltay;
unsigned int abs_deltaz;
int x_dir;
int y_dir;
int z_dir; // Figure directions.
Figure_dir(deltax, abs_deltax, x_dir);
Figure_dir(deltay, abs_deltay, y_dir);
Figure_dir(deltaz, abs_deltaz, z_dir);
if (abs_deltaz >= abs_deltax && // Moving fastest along z?
abs_deltaz >= abs_deltay) {
major_coord = &cur.tz;
minor_coord1 = &cur.tx;
minor_coord2 = &cur.ty;
major_dir = z_dir;
minor_dir1 = x_dir;
minor_dir2 = y_dir;
major_delta = abs_deltaz;
minor_delta1 = abs_deltax;
minor_delta2 = abs_deltay;
} else if (
abs_deltay >= abs_deltax && // Moving fastest along y?
abs_deltay >= abs_deltaz) {
major_coord = &cur.ty;
minor_coord1 = &cur.tx;
minor_coord2 = &cur.tz;
major_dir = y_dir;
minor_dir1 = x_dir;
minor_dir2 = z_dir;
major_delta = abs_deltay;
minor_delta1 = abs_deltax;
minor_delta2 = abs_deltaz;
} else { // Moving fastest along x?
major_coord = &cur.tx;
minor_coord1 = &cur.ty;
minor_coord2 = &cur.tz;
major_dir = x_dir;
minor_dir1 = y_dir;
minor_dir2 = z_dir;
major_delta = abs_deltax;
minor_delta1 = abs_deltay;
minor_delta2 = abs_deltaz;
}
major_distance = major_delta; // How far to go.
return true;
}
/*
* Get next point on path to go to (in tile coords).
*
* Output: false if all done.
*/
bool Zombie::GetNextStep(Tile_coord& n, bool& done) {
if (major_distance <= 0) {
done = true;
return false;
}
// Subtract from distance to go.
major_distance -= major_frame_incr;
// Accumulate change.
sum1 += major_frame_incr * minor_delta1;
sum2 += major_frame_incr * minor_delta2;
// Figure change in slower axes.
const int minor_frame_incr1 = sum1 / major_delta;
const int minor_frame_incr2 = sum2 / major_delta;
sum1 = sum1 % major_delta; // Remove what we used.
sum2 = sum2 % major_delta; // Remove what we used.
// Update coords. within world.
*major_coord += major_dir * major_frame_incr;
*minor_coord1 += minor_dir1 * minor_frame_incr1;
*minor_coord2 += minor_dir2 * minor_frame_incr2;
// Watch for wrapping.
*major_coord = (*major_coord + c_num_tiles) % c_num_tiles;
*minor_coord1 = (*minor_coord1 + c_num_tiles) % c_num_tiles;
*minor_coord2 = (*minor_coord2 + c_num_tiles) % c_num_tiles;
if (cur.tz < 0) { // We are below ground level.
cur.tz = 0;
major_distance = 0;
done = true;
return false;
}
n = cur; // Return new tile.
done = (major_distance <= 0); // Indicate if this is the last one.
return true;
}
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