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engines/ultima/nuvie/pathfinder/sched_path_finder.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "ultima/nuvie/core/nuvie_defs.h"
+#include "ultima/nuvie/actors/actor.h"
+#include "ultima/nuvie/core/map.h"
+#include "ultima/nuvie/pathfinder/path.h"
+#include "ultima/nuvie/pathfinder/sched_path_finder.h"
+
+namespace Ultima {
+namespace Nuvie {
+
+/* NOTE: Path_type must always be valid. */
+SchedPathFinder::SchedPathFinder(Actor *a, MapCoord g, Path *path_type)
+	: ActorPathFinder(a, g), prev_step_i(0), next_step_i(0) {
+	new_search(path_type);
+	assert(search && actor);
+}
+
+SchedPathFinder::~SchedPathFinder() {
+
+}
+
+bool SchedPathFinder::get_next_move(MapCoord &step) {
+	// jump to goal if both locations are off-screen
+	if (!goal.is_visible() && !loc.is_visible()) {
+		if (check_loc(goal)) {
+			search->delete_path();
+			step = goal;
+			return true;
+		}
+	}
+
+	if (!search->have_path())
+		if (!find_path())
+			return false;
+	step = search->get_step(next_step_i); // have a path, take a step
+	return true;
+}
+
+bool SchedPathFinder::find_path() {
+	if (search->have_path())
+		search->delete_path();
+	if (!search->path_search(loc, goal)) {
+		DEBUG(0, LEVEL_WARNING, "actor %d failed to find a path to %x,%x\n", actor->get_actor_num(), goal.x, goal.y);
+		return false;
+	}
+	prev_step_i = next_step_i = 0;
+	incr_step(); // the first step is the start location, so skip it
+	return true;
+}
+
+/* Returns true if actor location is correct. */
+bool SchedPathFinder::is_location_in_path() {
+	const MapCoord &prev_step = search->get_step(prev_step_i);
+	return (loc == prev_step);
+}
+
+/* Update previous and next steps in path. */
+void SchedPathFinder::incr_step() {
+	const MapCoord &prev_loc = search->get_step(prev_step_i);
+	const MapCoord &next_loc = search->get_step(next_step_i);
+	const MapCoord &last_loc = search->get_last_step();
+	if (prev_loc != last_loc) {
+		if (prev_loc != next_loc) // prev_step is going to stay behind next_step
+			++prev_step_i;
+		if (next_loc != last_loc)
+			++next_step_i;
+	}
+}
+
+void SchedPathFinder::actor_moved() {
+	update_location();
+	if (search->have_path())
+		incr_step();
+}
+
+/* Don't bother moving around other actors. They will probably move soon. */
+bool SchedPathFinder::check_loc(const MapCoord &locPos) {
+	return actor->check_move(locPos.x, locPos.y, locPos.z, ACTOR_IGNORE_OTHERS);
+}
+
+} // End of namespace Nuvie
+} // End of namespace Ultima