我正在构建一个迷宫跑步者机器人,其目标是能够在从给定起点到给定终点的迷宫中导航。我自己设计了算法 - 在查看以前的工作之前,我坚持让自己的实现工作。
算法的一部分涉及对方向进行排序(使用插入排序,因为数组太小) - 转发,向后,向上和 down 就它们的前景而言。
我在排序方面遇到了一些问题,它根据三个因素对方向进行排序
排序时,我要比较因子1.如果它们相等,我比较因子2.如果因子2相等,我继续3.如果任何两个因素小于或< em>超过,我回复了。 出于某种原因,有时候状态较低的路径会被推到后面。我对路径的排序出了点问题。
enter code here
有什么想法吗?
/*------------( Getting the best direction to go in )---------------- */
/*
* 0: North
* 1: East
* 2: South
* 3: West
*/
int bestDirection(Point _curr_pos){
Vec4 statuses/*1 for unexplored(better), 2 for explored(worse)*/,
distances ,
lengths = collectDistancesToWalls(),
availablities = {POINT_REACHABLE, POINT_REACHABLE, POINT_REACHABLE, POINT_REACHABLE},
directions = {0,1,2,3};
//Give directions a length rating and distance rating and then sorts the directions, leaving the best direction in the front.
//If we discover that we have already been in a location, we should block off the passage behind us leading to that location because it must be a loop.
//Collecting the distance and length data.
for (int i=0; i < 4; i++) {
Point direction_translated = translateOnAxisInDirection(_curr_pos, i, 1);
//Converts the point to a reachable square - unnecessary to describe here. There is a domain specific problem which necessitates this function to be used.
Point heading_direction = pointToReachableSquare(direction_translated , i);
//Distance from end of path to "headinglocation", the goal
Point vec_to_end = subVec(heading_direction, headingLocation);
distances[i] = min(absv(vec_to_end.x), absv(vec_to_end.y));
statuses[i] = history[heading_direction.x][heading_direction.y].status;
//If path is unreachable because of wall or something, then mark it as unreachable.
if (cmpVec(heading_direction, _curr_pos) || history[heading_direction.x][heading_direction.y].classification == WALL || !pointInIndBounds(direction_translated)) {
availablities[i] = POINT_UNREACHABLE;
}
}
//Insertion sort the distances.
for (int i = 1; i < 4; i++) {
int j = i - 1;
while (
comparePathOptions(
statuses[i],
distances[i],
lengths[i],
statuses[j],
distances[j],
lengths[j]
) == LESS_THAN && (j >= 0)) {
int temp = directions[i];
directions[i] = directions[j];
directions[j] = temp;
j--;
}
}
//Return the first reachable direction.
int ind = 0;
int dir = directions[ind];
while (availablities[ directions[ind] ] == POINT_UNREACHABLE && (ind<4)) {
dir = directions[ind+1];
ind++;
}
return dir;
}
比较功能:
int relationship(int a, int b){
if (a < b) return LESS_THAN;
if (a > b) return MORE_THAN;
return EQUAL;
}
//Edit this function
//TODO: Edit comparePathOptions.
//NOTE: Something
int comparePathOptions(int n_explored, int n_closeness, int n_length,
int b_explored, int b_closeness, int b_length){
int objs[][3] = {
{n_explored, n_closeness, n_length},
{b_explored, b_closeness, b_length}
};
for (int i = 0; i < 3; i++){
int rel = relationship(objs[1][i],objs[0][i]);
if (rel!= EQUAL ) return rel;
}
return EQUAL;
}
感谢@Kittsil我已经让算法运行了!
不是statuses
和lengths
distances
,j
和i
,而是directions[i or j]
,i
j
在更改方向数组时停止引用当前方向。
已修改的代码:
while ( (j >= 0) &&
comparePathOptions(
statuses[ directions[i] ],
distances[ directions[i] ],
lengths[ directions[i] ],
statuses[ directions[j] ],
distances[ directions[j] ],
lengths[ directions[j] ]
) == MORE_THAN ) {
int temp = directions[i];
directions[i] = directions[j];
directions[j] = temp;
j--;
}
解决的迷宫:
x: 0, y: 0
H: 5, W:5, Ss:1
4|#####|
3|#####|
2|#####|
1|#####|
0|*::::|
01234
4|#####|
3|#####|
2|#####|
1|#####|
0| *:::|
01234
4|#####|
3|#####|
2|#####|
1|#####|
0| *::|
01234
4|#####|
3|#####|
2|#####|
1|#####|
0| *:|
01234
4|#####|
3|#####|
2|####:|
1|####:|
0| *|
01234
4|#####|
3|#####|
2|####:|
1|####*|
0| |
01234
4|#####|
3|#####|
2|::::*|
1|#### |
0| |
01234
4|#####|
3|#####|
2|:::* |
1|#### |
0| |
01234
4|#####|
3|#####|
2|::* |
1|#### |
0| |
01234
4|#####|
3|#####|
2|:* |
1|#### |
0| |
01234
4|:####|
3|:####|
2|* |
1|#### |
0| |
01234
4|:####|
3|*####|
2| |
1|#### |
0| |
01234
4|*####|
3| ####|
2| |
1|#### |
0| |
01234
答案 0 :(得分:2)
您正在对directions
数组进行排序,但是您无法对其他数组进行排序;只要您进行第一次互换,statuses
,distances
和lengths
就不再与directions
相关联。
说明:问题在于您对比较功能的调用。在这段代码中:
while (
comparePathOptions(statuses[i],
distances[i],
lengths[i],
statuses[j],
distances[j],
lengths[j])
== LESS_THAN &&
(j >= 0)
) {
int temp = directions[i];
directions[i] = directions[j];
directions[j] = temp;
j--;
}
您正在使用i
和j
来访问包含排序信息的数组。只要i
和j
与directions[i]
和directions[j]
不同,就不会出现您的预期。您有两种选择:
一,将您的通话更改为comparePathOptions(.)
至
comparePathOptions(statuses[directions[i]],
distances[directions[i]],
lengths[directions[i]],
statuses[directions[j]],
distances[directions[j]],
lengths[directions[j]])
OR ,按照惯例,将您关注的信息存储在(非常小的)对象中,并对这些对象的矢量进行排序。
此外,当您j=-1
时,您会在循环中超出范围并进行比较。您应该将(j>=0)
移动到AND的左侧。
说明:在几乎所有语言中,&amp;&amp;和||是short-circuiting。如果&&
的左侧是false
(或||
的左侧是true
),则该语言甚至不会评估右侧;它已经知道布尔函数的结果。在您的实例中,您不希望在comparePathOptions(.)
时评估j<0
,因为这会使您超出范围。因此,在使用j
作为索引之前,您应该将0
与j
进行比较。