diff options
Diffstat (limited to 'src/map/path.c')
| -rw-r--r-- | src/map/path.c | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/src/map/path.c b/src/map/path.c new file mode 100644 index 000000000..ad5c06f0f --- /dev/null +++ b/src/map/path.c @@ -0,0 +1,483 @@ +// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
+// For more information, see LICENCE in the main folder
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "map.h"
+#include "battle.h"
+#include "nullpo.h"
+#include "../common/showmsg.h"
+
+#define MAX_HEAP 150
+
+struct tmp_path { short x,y,dist,before,cost; char dir,flag;};
+#define calc_index(x,y) (((x)+(y)*MAX_WALKPATH) & (MAX_WALKPATH*MAX_WALKPATH-1))
+
+/*==========================================
+ * 経路探索補助heap push
+ *------------------------------------------
+ */
+static void push_heap_path(int *heap,struct tmp_path *tp,int index)
+{
+ int i,h;
+
+ if( heap == NULL || tp == NULL ){
+ ShowError("push_heap_path nullpo\n");
+ return;
+ }
+
+ 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;
+}
+
+/*==========================================
+ * 経路探索補助heap update
+ * 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;
+
+ nullpo_retv(heap);
+ nullpo_retv(tp);
+
+ for(h=0;h<heap[0];h++)
+ if(heap[h+1]==index)
+ break;
+ 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;
+}
+
+/*==========================================
+ * 経路探索補助heap pop
+ *------------------------------------------
+ */
+static int pop_heap_path(int *heap,struct tmp_path *tp)
+{
+ int i,h,k;
+ int ret,last;
+
+ nullpo_retr(-1, heap);
+ nullpo_retr(-1, tp);
+
+ if(heap[0]<=0)
+ return -1;
+ 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)
+ 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;
+ heap[h+1]=last;
+
+ return ret;
+}
+
+/*==========================================
+ * 現在の点のcost計算
+ *------------------------------------------
+ */
+static int calc_cost(struct tmp_path *p,int x1,int y1)
+{
+ int xd,yd;
+
+ nullpo_retr(0, p);
+
+ xd=x1-p->x;
+ if(xd<0) xd=-xd;
+ yd=y1-p->y;
+ if(yd<0) yd=-yd;
+ return (xd+yd)*10+p->dist;
+}
+
+/*==========================================
+ * 必要ならpathを追加/修正する
+ *------------------------------------------
+ */
+static int add_path(int *heap,struct tmp_path *tp,int x,int y,int dist,int dir,int before,int x1,int y1)
+{
+ int i;
+
+ nullpo_retr(0, heap);
+ nullpo_retr(0, tp);
+
+ 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].dir=dir;
+ tp[i].before=before;
+ tp[i].cost=calc_cost(&tp[i],x1,y1);
+ if(tp[i].flag)
+ push_heap_path(heap,tp,i);
+ else
+ update_heap_path(heap,tp,i);
+ tp[i].flag=0;
+ }
+ return 0;
+ }
+
+ if(tp[i].x || tp[i].y)
+ return 1;
+
+ tp[i].x=x;
+ tp[i].y=y;
+ tp[i].dist=dist;
+ tp[i].dir=dir;
+ tp[i].before=before;
+ tp[i].cost=calc_cost(&tp[i],x1,y1);
+ tp[i].flag=0;
+ push_heap_path(heap,tp,i);
+
+ return 0;
+}
+
+
+/*==========================================
+ * (x,y)が移動不可能地帯かどうか
+ * flag 0x10000 遠距離攻撃判定
+ *------------------------------------------
+ */
+static int can_place(struct map_data *m,int x,int y,int flag)
+{
+ nullpo_retr(0, m);
+
+ if(map_getcellp(m,x,y,CELL_CHKPASS))
+ return 1;
+ if((flag&0x10000)&&map_getcellp(m,x,y,CELL_CHKGROUND))
+ return 1;
+ return 0;
+}
+
+/*==========================================
+ * (x0,y0)から(x1,y1)へ1歩で移動可能か計算
+ *------------------------------------------
+ */
+static int can_move(struct map_data *m,int x0,int y0,int x1,int y1,int flag)
+{
+ nullpo_retr(0, m);
+
+ if(x0-x1<-1 || x0-x1>1 || y0-y1<-1 || y0-y1>1)
+ return 0;
+ 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]
+ return 1;
+#ifndef CELL_NOSTACK
+ //In no-stack mode, do not check current cell.
+ if(!can_place(m,x0,y0,flag))
+ return 0;
+#endif
+ if(!can_place(m,x1,y1,flag))
+ return 0;
+ if(x0==x1 || y0==y1)
+ return 1;
+ if(!can_place(m,x0,y1,flag) || !can_place(m,x1,y0,flag))
+ return 0;
+ return 1;
+}
+
+/*==========================================
+ * (x0,y0)から(dx,dy)方向へcountセル分
+ * 吹き飛ばしたあとの座標を所得
+ *------------------------------------------
+ */
+int path_blownpos(int m,int x0,int y0,int dx,int dy,int count)
+{
+ struct map_data *md;
+
+ if(!map[m].gat)
+ return -1;
+ md=&map[m];
+
+ if(count>15){ // 最大10マスに制限
+ if(battle_config.error_log)
+ ShowWarning("path_blownpos: count too many %d !\n",count);
+ count=15;
+ }
+ 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);
+ }
+
+ while( (count--)>0 && (dx!=0 || dy!=0) ){
+ 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));
+ if( fx && fy ){
+ if(rand()&1) dx=0;
+ else dy=0;
+ }
+ if( !fx ) dx=0;
+ if( !fy ) dy=0;
+ }
+ x0+=dx;
+ y0+=dy;
+ }
+ return (x0<<16)|y0;
+}
+
+/*==========================================
+ * ﾀﾋ袮ﾍ?ｪｬﾊｦﾒｪｫｪﾉｪｦｪｫｪﾚｪｹ
+ *------------------------------------------
+ */
+#define swap(x,y) { int t; t = x; x = y; y = t; }
+int path_search_long(struct shootpath_data *spd,int m,int x0,int y0,int x1,int y1)
+{
+ int dx, dy;
+ int wx = 0, wy = 0;
+ int weight;
+ struct map_data *md;
+
+ if (!map[m].gat)
+ return 0;
+ md = &map[m];
+
+ dx = (x1 - x0);
+ if (dx < 0) {
+ swap(x0, x1);
+ swap(y0, y1);
+ dx = -dx;
+ }
+ dy = (y1 - y0);
+
+ if (spd) {
+ spd->rx = spd->ry = 0;
+ spd->len = 1;
+ spd->x[0] = x0;
+ spd->y[0] = y0;
+ }
+
+ if (map_getcellp(md,x1,y1,CELL_CHKWALL))
+ return 0;
+
+ if (dx > abs(dy)) {
+ weight = dx;
+ if (spd)
+ spd->ry=1;
+ } else {
+ weight = abs(y1 - y0);
+ if (spd)
+ spd->rx=1;
+ }
+
+ while (x0 != x1 || y0 != y1) {
+ if (map_getcellp(md,x0,y0,CELL_CHKWALL))
+ return 0;
+ wx += dx;
+ wy += dy;
+ if (wx >= weight) {
+ wx -= weight;
+ x0 ++;
+ }
+ if (wy >= weight) {
+ wy -= weight;
+ y0 ++;
+ } else if (wy < 0) {
+ wy += weight;
+ y0 --;
+ }
+ if (spd && spd->len<MAX_WALKPATH) {
+ spd->x[spd->len] = x0;
+ spd->y[spd->len] = y0;
+ spd->len++;
+ }
+ }
+
+ return 1;
+}
+
+/*==========================================
+ * path探索 (x0,y0)->(x1,y1)
+ *------------------------------------------
+ */
+int path_search(struct walkpath_data *wpd,int m,int x0,int y0,int x1,int y1,int flag)
+{
+ int heap[MAX_HEAP+1];
+ struct tmp_path tp[MAX_WALKPATH*MAX_WALKPATH];
+ int i,rp,x,y;
+ struct map_data *md;
+ int dx,dy;
+
+ nullpo_retr(0, wpd);
+
+ if(!map[m].gat)
+ return -1;
+ md=&map[m];
+ if(x1<0 || x1>=md->xs || y1<0 || y1>=md->ys || map_getcellp(md,x1,y1,CELL_CHKNOPASS))
+ return -1;
+
+ // easy
+ dx = (x1-x0<0) ? -1 : 1;
+ dy = (y1-y0<0) ? -1 : 1;
+ for(x=x0,y=y0,i=0;x!=x1 || y!=y1;){
+ if(i>=sizeof(wpd->path))
+ return -1;
+ if(x!=x1 && y!=y1){
+ if(!can_move(md,x,y,x+dx,y+dy,flag))
+ break;
+ x+=dx;
+ y+=dy;
+ wpd->path[i++]=(dx<0) ? ((dy>0)? 1 : 3) : ((dy<0)? 5 : 7);
+ } else if(x!=x1){
+ if(!can_move(md,x,y,x+dx,y ,flag))
+ break;
+ x+=dx;
+ wpd->path[i++]=(dx<0) ? 2 : 6;
+ } else if(y!=y1){
+ if(!can_move(md,x,y,x ,y+dy,flag))
+ break;
+ y+=dy;
+ wpd->path[i++]=(dy>0) ? 0 : 4;
+ }
+ }
+ if (x==x1 && y==y1) { //easy path successful.
+ wpd->path_len=i;
+ wpd->path_pos=0;
+ wpd->path_half=0;
+ return 0;
+ }
+
+ if(flag&1)
+ return -1;
+
+ memset(tp,0,sizeof(tp));
+
+ i=calc_index(x0,y0);
+ tp[i].x=x0;
+ tp[i].y=y0;
+ tp[i].dist=0;
+ tp[i].dir=0;
+ tp[i].before=0;
+ tp[i].cost=calc_cost(&tp[i],x1,y1);
+ tp[i].flag=0;
+ heap[0]=0;
+ push_heap_path(heap,tp,calc_index(x0,y0));
+ while(1){
+ int e=0,fromdir;
+
+ if(heap[0]==0)
+ return -1;
+ rp=pop_heap_path(heap,tp);
+ x=tp[rp].x;
+ y=tp[rp].y;
+ if(x==x1 && y==y1){
+ int len,j;
+
+ for(len=0,i=rp;len<100 && i!=calc_index(x0,y0);i=tp[i].before,len++);
+ if(len==100 || len>=sizeof(wpd->path))
+ return -1;
+ wpd->path_len=len;
+ wpd->path_pos=0;
+ wpd->path_half=0;
+ for(i=rp,j=len-1;j>=0;i=tp[i].before,j--)
+ wpd->path[j]=tp[i].dir;
+
+ return 0;
+ }
+ fromdir=tp[rp].dir;
+ if(can_move(md,x,y,x+1,y-1,flag))
+ e+=add_path(heap,tp,x+1,y-1,tp[rp].dist+14,5,rp,x1,y1);
+ if(can_move(md,x,y,x+1,y ,flag))
+ e+=add_path(heap,tp,x+1,y ,tp[rp].dist+10,6,rp,x1,y1);
+ if(can_move(md,x,y,x+1,y+1,flag))
+ e+=add_path(heap,tp,x+1,y+1,tp[rp].dist+14,7,rp,x1,y1);
+ if(can_move(md,x,y,x ,y+1,flag))
+ e+=add_path(heap,tp,x ,y+1,tp[rp].dist+10,0,rp,x1,y1);
+ if(can_move(md,x,y,x-1,y+1,flag))
+ e+=add_path(heap,tp,x-1,y+1,tp[rp].dist+14,1,rp,x1,y1);
+ if(can_move(md,x,y,x-1,y ,flag))
+ e+=add_path(heap,tp,x-1,y ,tp[rp].dist+10,2,rp,x1,y1);
+ if(can_move(md,x,y,x-1,y-1,flag))
+ e+=add_path(heap,tp,x-1,y-1,tp[rp].dist+14,3,rp,x1,y1);
+ if(can_move(md,x,y,x ,y-1,flag))
+ e+=add_path(heap,tp,x ,y-1,tp[rp].dist+10,4,rp,x1,y1);
+ tp[rp].flag=1;
+ if(e || heap[0]>=MAX_HEAP-5)
+ return -1;
+ }
+ 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
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