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-rw-r--r--src/map/path.c261
1 files changed, 103 insertions, 158 deletions
diff --git a/src/map/path.c b/src/map/path.c
index da96433ad..52c34756a 100644
--- a/src/map/path.c
+++ b/src/map/path.c
@@ -32,120 +32,118 @@ const char walk_choices [3][3] =
};
/*==========================================
- * 経路探索補助heap push
+ * heap push (helper function)
*------------------------------------------*/
static void push_heap_path(int *heap,struct tmp_path *tp,int index)
{
int i,h;
+ h = heap[0];
heap[0]++;
- for(h=heap[0]-1,i=(h-1)/2;
- h>0 && tp[index].cost<tp[heap[i+1]].cost;
- i=(h-1)/2)
- heap[h+1]=heap[i+1],h=i;
- heap[h+1]=index;
+ for( i = (h-1)/2; h > 0 && tp[index].cost < tp[heap[i+1]].cost; i = (h-1)/2 )
+ heap[h+1] = heap[i+1], h = i;
+
+ heap[h+1] = index;
}
/*==========================================
- * 経路探索補助heap update
+ * heap update (helper function)
* costが減ったので根の方へ移動
*------------------------------------------*/
static void update_heap_path(int *heap,struct tmp_path *tp,int index)
{
int i,h;
- for(h=0;h<heap[0];h++)
- if(heap[h+1]==index)
- break;
- if(h==heap[0]){
+ ARR_FIND( 0, heap[0], h, heap[h+1] == index );
+ if( h == heap[0] )
+ {
ShowError("update_heap_path bug\n");
exit(1);
}
- for(i=(h-1)/2;
- h>0 && tp[index].cost<tp[heap[i+1]].cost;
- i=(h-1)/2)
- heap[h+1]=heap[i+1],h=i;
- heap[h+1]=index;
+
+ for( i = (h-1)/2; h > 0 && tp[index].cost < tp[heap[i+1]].cost; i = (h-1)/2 )
+ heap[h+1] = heap[i+1], h = i;
+
+ heap[h+1] = index;
}
/*==========================================
- * 経路探索補助heap pop
+ * heap pop (helper function)
*------------------------------------------*/
static int pop_heap_path(int *heap,struct tmp_path *tp)
{
int i,h,k;
int ret,last;
- if(heap[0]<=0)
+ if( heap[0] <= 0 )
return -1;
- ret=heap[1];
- last=heap[heap[0]];
+ ret = heap[1];
+ last = heap[heap[0]];
heap[0]--;
- for(h=0,k=2;k<heap[0];k=k*2+2){
- if(tp[heap[k+1]].cost>tp[heap[k]].cost)
+ for( h = 0, k = 2; k < heap[0]; k = k*2+2 )
+ {
+ if( tp[heap[k+1]].cost > tp[heap[k]].cost )
k--;
- heap[h+1]=heap[k+1], h=k;
+ heap[h+1] = heap[k+1], h = k;
}
- if(k==heap[0])
- heap[h+1]=heap[k], h=k-1;
- for(i=(h-1)/2;
- h>0 && tp[heap[i+1]].cost>tp[last].cost;
- i=(h-1)/2)
- heap[h+1]=heap[i+1],h=i;
+ if( k == heap[0] )
+ heap[h+1] = heap[k], h = k-1;
+
+ for( i = (h-1)/2; h > 0 && tp[heap[i+1]].cost > tp[last].cost; i = (h-1)/2 )
+ heap[h+1] = heap[i+1], h = i;
+
heap[h+1]=last;
return ret;
}
/*==========================================
- * 現在の点のcost計算
+ * calculate cost for the specified position
*------------------------------------------*/
static int calc_cost(struct tmp_path *p,int x1,int y1)
{
- int xd,yd;
-
- xd=x1-p->x;
- if(xd<0) xd=-xd;
- yd=y1-p->y;
- if(yd<0) yd=-yd;
- return (xd+yd)*10+p->dist;
+ int xd = abs(x1 - p->x);
+ int yd = abs(y1 - p->y);
+ return (xd + yd)*10 + p->dist;
}
/*==========================================
- * 必要ならpathを追加/修正する
+ * attach/adjust path if neccessary
*------------------------------------------*/
static int add_path(int *heap,struct tmp_path *tp,int x,int y,int dist,int before,int cost)
{
int i;
- i=calc_index(x,y);
+ i = calc_index(x,y);
- if(tp[i].x==x && tp[i].y==y){
- if(tp[i].dist>dist){
- tp[i].dist=dist;
- tp[i].before=before;
- tp[i].cost=cost;
- if(tp[i].flag)
+ if( tp[i].x == x && tp[i].y == y )
+ {
+ if( tp[i].dist > dist )
+ {
+ tp[i].dist = dist;
+ tp[i].before = before;
+ tp[i].cost = cost;
+ if( tp[i].flag )
push_heap_path(heap,tp,i);
else
update_heap_path(heap,tp,i);
- tp[i].flag=0;
+ tp[i].flag = 0;
}
return 0;
}
- if(tp[i].x || tp[i].y)
+ if( tp[i].x || tp[i].y )
return 1;
- tp[i].x=x;
- tp[i].y=y;
- tp[i].dist=dist;
- tp[i].before=before;
- tp[i].cost=cost;
- tp[i].flag=0;
+ tp[i].x = x;
+ tp[i].y = y;
+ tp[i].dist = dist;
+ tp[i].before = before;
+ tp[i].cost = cost;
+ tp[i].flag = 0;
push_heap_path(heap,tp,i);
return 0;
@@ -153,42 +151,44 @@ static int add_path(int *heap,struct tmp_path *tp,int x,int y,int dist,int befor
/*==========================================
- * (x,y)が移動不可能地帯かどうか
- * flag 0x10000 遠距離攻撃判定
+ * is (x,y) passable?
+ * flag: 0x10000 = ranged attack check
+ * 0x30000 = stacking check
*------------------------------------------*/
static int can_place(struct map_data *m,int x,int y,int flag)
{
- if(map_getcellp(m,x,y,CELL_CHKPASS))
+ if( map_getcellp(m,x,y,CELL_CHKPASS) )
return 1;
- if((flag&0x10000)&&map_getcellp(m,x,y,CELL_CHKGROUND))
+ if( (flag&0x10000)&&map_getcellp(m,x,y,CELL_CHKGROUND) )
return 1;
#ifdef CELL_NOSTACK
//Special flag for CELL_NOSTACK systems. Returns true when the given cell is stacked. [Skotlex]
- if((flag&0x30000)&&map_getcellp(m,x,y,CELL_CHKSTACK))
+ if( (flag&0x30000)&&map_getcellp(m,x,y,CELL_CHKSTACK) )
return 1;
#endif
return 0;
}
/*==========================================
- * (x0,y0)から(x1,y1)へ1歩で移動可能か計算
+ * can you move from (x0,y0) to (x1,y1) in one step?
+ * (helper function for path_blownpos())
*------------------------------------------*/
static int can_move(struct map_data *m,int x0,int y0,int x1,int y1,int flag)
{
- if(x1<0 || y1<0 || x1>=m->xs || y1>=m->ys)
- return 0;
- if(flag&0x20000) //Flag to ignore everything, for use with Taekwon's Jump skill currently. [Skotlex]
+ if( x1 < 0 || y1 < 0 || x1 >= m->xs || y1 >= m->ys)
+ return 0; // out-of-bounds coordinates
+ if( flag&0x20000 ) //Flag to ignore everything, for use with Taekwon's Jump skill currently. [Skotlex]
return 1;
#ifndef CELL_NOSTACK
//In no-stack mode, do not check current cell.
- if(!can_place(m,x0,y0,flag))
+ if( !can_place(m,x0,y0,flag) )
return 0;
#endif
- if(!can_place(m,x1,y1,flag))
+ if( !can_place(m,x1,y1,flag) )
return 0;
- if(x0==x1 || y0==y1)
+ if( x0 == x1 || y0 == y1 )
return 1;
- if(!can_place(m,x0,y1,flag) || !can_place(m,x1,y0,flag))
+ if( !can_place(m,x0,y1,flag) || !can_place(m,x1,y0,flag) )
return 0;
return 1;
}
@@ -201,23 +201,24 @@ int path_blownpos(int m,int x0,int y0,int dx,int dy,int count)
{
struct map_data *md;
- if(!map[m].gat)
+ if( !map[m].gat )
return -1;
- md=&map[m];
+ md = &map[m];
- if(count>25){ //Cap to prevent too much processing...?
- if(battle_config.error_log)
+ if( count>25 ){ //Cap to prevent too much processing...?
+ if( battle_config.error_log )
ShowWarning("path_blownpos: count too many %d !\n",count);
count=25;
}
- if(dx>1 || dx<-1 || dy>1 || dy<-1){
- if(battle_config.error_log)
+ if( dx > 1 || dx < -1 || dy > 1 || dy < -1 ){
+ if( battle_config.error_log )
ShowError("path_blownpos: illeagal dx=%d or dy=%d !\n",dx,dy);
- dx=(dx>=0)?1:((dx<0)?-1:0);
- dy=(dy>=0)?1:((dy<0)?-1:0);
+ dx=(dx>0)?1:((dx<0)?-1:0);
+ dy=(dy>0)?1:((dy<0)?-1:0);
}
- while( (count--)>0 && (dx || dy) ){
+ while( (count--)>0 && (dx || dy) )
+ {
if( !can_move(md,x0,y0,x0+dx,y0+dy,0) ){
int fx=(dx!=0 && can_move(md,x0,y0,x0+dx,y0,0));
int fy=(dy!=0 && can_move(md,x0,y0,x0,y0+dy,0));
@@ -235,9 +236,9 @@ int path_blownpos(int m,int x0,int y0,int dx,int dy,int count)
}
/*==========================================
- * 遠距離攻撃が可能かどうかを返す
+ * is ranged attack from (x0,y0) to (x1,y1) possible?
*------------------------------------------*/
-int path_search_long_real(struct shootpath_data *spd,int m,int x0,int y0,int x1,int y1,cell_t flag)
+bool path_search_long_real(struct shootpath_data *spd,int m,int x0,int y0,int x1,int y1,cell_t flag)
{
int dx, dy;
int wx = 0, wy = 0;
@@ -245,7 +246,7 @@ int path_search_long_real(struct shootpath_data *spd,int m,int x0,int y0,int x1,
struct map_data *md;
if (!map[m].gat)
- return 0;
+ return false;
md = &map[m];
dx = (x1 - x0);
@@ -264,7 +265,7 @@ int path_search_long_real(struct shootpath_data *spd,int m,int x0,int y0,int x1,
}
if (map_getcellp(md,x1,y1,flag))
- return 0;
+ return false;
if (dx > abs(dy)) {
weight = dx;
@@ -278,7 +279,7 @@ int path_search_long_real(struct shootpath_data *spd,int m,int x0,int y0,int x1,
while (x0 != x1 || y0 != y1) {
if (map_getcellp(md,x0,y0,flag))
- return 0;
+ return false;
wx += dx;
wy += dy;
if (wx >= weight) {
@@ -299,11 +300,12 @@ int path_search_long_real(struct shootpath_data *spd,int m,int x0,int y0,int x1,
}
}
- return 1;
+ return true;
}
/*==========================================
- * path探索 (x0,y0)->(x1,y1)
+ * path search (x0,y0)->(x1,y1)
+ * flag: &1 = easy path search only
*------------------------------------------*/
int path_search_real(struct walkpath_data *wpd,int m,int x0,int y0,int x1,int y1,int flag,cell_t flag2)
{
@@ -315,56 +317,49 @@ int path_search_real(struct walkpath_data *wpd,int m,int x0,int y0,int x1,int y1
nullpo_retr(0, wpd);
- if(!map[m].gat)
+ if( !map[m].gat )
return -1;
- md=&map[m];
+ md = &map[m];
#ifdef CELL_NOSTACK
//Do not check starting cell as that would get you stuck.
- if(x0<0 || x0>=md->xs || y0<0 || y0>=md->ys)
+ if( x0 < 0 || x0 >= md->xs || y0 < 0 || y0 >= md->ys )
#else
- if(x0<0 || x0>=md->xs || y0<0 || y0>=md->ys || map_getcellp(md,x0,y0,flag2))
+ if( x0 < 0 || x0 >= md->xs || y0 < 0 || y0 >= md->ys || map_getcellp(md,x0,y0,flag2) )
#endif
return -1;
- if(x1<0 || x1>=md->xs || y1<0 || y1>=md->ys || map_getcellp(md,x1,y1,flag2))
+ if( x1 < 0 || x1 >= md->xs || y1 < 0 || y1 >= md->ys || map_getcellp(md,x1,y1,flag2) )
return -1;
- // easy and better [Meruru]
+ // calculate (sgn(x1-x0), sgn(y1-y0))
dx = ((dx = x1-x0)) ? ((dx<0) ? -1 : 1) : 0;
dy = ((dy = y1-y0)) ? ((dy<0) ? -1 : 1) : 0;
- //Better faster stronger simple path algo. [Meruru]
- for(x=x0,y=y0,i=0;i < sizeof(wpd->path);)
+ // try finding direct path to target
+ for( x = x0, y = y0, i = 0; i < ARRAYLENGTH(wpd->path); )
{
wpd->path[i++] = walk_choices[-dy + 1][dx + 1];
x += dx;
y += dy;
- if(x == x1) dx = 0;
- if(y == y1) dy = 0;
+ if( x == x1 ) dx = 0;
+ if( y == y1 ) dy = 0;
- if((!dx && !dy) || map_getcellp(md,x,y,flag2))
- break;
+ if( !dx && !dy )
+ break; // success
+ if( map_getcellp(md,x,y,flag2) )
+ break; // obstacle = failure
}
- /*
- You may be thinking what about diagonal
- moves? Can't they cause a error with this somehow?
- Answer is NO! The only time this can cause a error
- is if the target block lies on the diagonal and
- is non walkable. But rember we already checked that
- up above! So no problems here... I think [Meruru]
- */
-
- if (x==x1 && y==y1)
+ if( x == x1 && y == y1 )
{ //easy path successful.
- wpd->path_len=i;
- wpd->path_pos=0;
- wpd->path_half=0;
+ wpd->path_len = i;
+ wpd->path_pos = 0;
+ wpd->path_half = 0;
return 0;
}
- if(flag&1)
+ if( flag&1 )
return -1;
memset(tp,0,sizeof(tp));
@@ -471,53 +466,3 @@ int path_search_real(struct walkpath_data *wpd,int m,int x0,int y0,int x1,int y1
}
return -1;
}
-
-/*==========================================
- * path探索 (x0,y0)->(x1,y1)
- *------------------------------------------*/
-
-#ifdef PATH_STANDALONETEST
-char gat[64][64]={
- {0,0,0,0,0,0,0,0,0,0},
- {0,0,0,0,0,0,0,0,0,0},
- {0,0,0,0,0,0,0,0,0,0},
- {0,0,0,0,0,0,0,0,0,0},
- {0,0,0,0,1,0,0,0,0,0},
-};
-struct map_data map[1];
-
-/*==========================================
- * 経路探索ルーチン単体テスト用main関数
- *------------------------------------------*/
-void main(int argc,char *argv[])
-{
- struct walkpath_data wpd;
-
- map[0].gat=gat;
- map[0].xs=64;
- map[0].ys=64;
-
- path_search(&wpd,0,3,4,5,4);
- path_search(&wpd,0,5,4,3,4);
- path_search(&wpd,0,6,4,3,4);
- path_search(&wpd,0,7,4,3,4);
- path_search(&wpd,0,4,3,4,5);
- path_search(&wpd,0,4,2,4,5);
- path_search(&wpd,0,4,1,4,5);
- path_search(&wpd,0,4,5,4,3);
- path_search(&wpd,0,4,6,4,3);
- path_search(&wpd,0,4,7,4,3);
- path_search(&wpd,0,7,4,3,4);
- path_search(&wpd,0,8,4,3,4);
- path_search(&wpd,0,9,4,3,4);
- path_search(&wpd,0,10,4,3,4);
- path_search(&wpd,0,11,4,3,4);
- path_search(&wpd,0,12,4,3,4);
- path_search(&wpd,0,13,4,3,4);
- path_search(&wpd,0,14,4,3,4);
- path_search(&wpd,0,15,4,3,4);
- path_search(&wpd,0,16,4,3,4);
- path_search(&wpd,0,17,4,3,4);
- path_search(&wpd,0,18,4,3,4);
-}
-#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-07 18:56:29 +0000