Index: bindings.doc
==================================================================
--- bindings.doc
+++ bindings.doc
@@ -266,10 +266,14 @@
   Quit.
 
 '^Y'
   Sound test. (Does nothing if sound is not configured.)
 
+'^l' <location>
+  Draw lines horizontal, vertical, and diagonal, from the clicked location,
+  until the mouse button is released.
+
 'go' <level>
   Go to the specified level. If the level number is negative, then it is
   a level order number, otherwise it is a level ID number.
 
 

Index: default.heromeshrc
==================================================================
--- default.heromeshrc
+++ default.heromeshrc
@@ -222,9 +222,10 @@
 ?.?.ctrl.S: ^S
 ?.?.ctrl.T: ^T
 ?.?.ctrl.Y: ^Y
 ?.?.shift.ctrl.M: select ':s';
 ?.?.f10: select ':x';
+?.?.ctrl.middle: ^l
 
 ! Picture editor macros
 ?.picedit.macro.M: insert into graph(x,y,c) select s-x-1,y,c from graph where x<s/2;
 

Index: edit.c
==================================================================
--- edit.c
+++ edit.c
@@ -1850,10 +1850,13 @@
       class_image_select();
       return 0;
     case '^e': // Edit Misc/Dir of MRU slot
       mru_edit(mru+curmru);
       return 0;
+    case '^l': // Draw lines from location
+      draw_lines(number%64?:64,number/64);
+      return prev;
     case '^s': // String list/edit
       string_list();
       return 0;
     case '^u': // Add object (allow duplicates)
       if(prev) return prev;

Index: edit.doc
==================================================================
--- edit.doc
+++ edit.doc
@@ -249,11 +249,12 @@
 
   LEFT          Add object
   CTRL+LEFT     Edit Misc/Dir of object
   ALT+LEFT      Add object (allow duplicate)
   SHIFT+LEFT    Set top corner of selection rectangle
+  CTRL+MIDDLE   Show lines
   ALT+MIDDLE    Set Misc2/Misc3 of MRU to X/Y
   SHIFT+MIDDLE  Make 1x1 selection rectangle
   RIGHT         Delete object
   CTRL+RIGHT    Copy object to MRU
   SHIFT+RIGHT   Set bottom corner of selection rectangle
 

Index: game.c
==================================================================
--- game.c
+++ game.c
@@ -1423,10 +1423,14 @@
     case '^d': // Describe object
       describe_at(number-65);
       return prev;
     case '^g': // Display global variables
       global_examine();
+      return prev;
+    case '^l': // Draw lines from location
+      timerflag=1;
+      draw_lines(number%64?:64,number/64);
       return prev;
     case '^n': // List objects (bizarro)
       list_objects_at(number-65,bizplayfield,"bizarro ");
       return prev;
     case '^o': // List objects

Index: game.doc
==================================================================
--- game.doc
+++ game.doc
@@ -187,9 +187,11 @@
   CTRL+num    Load state 1 to 8
   ALT+num     Exchange state 1 to 8
 
 Mouse (in grid):
 
+  SHIFT+LEFT   Attempt to move player
   MIDDLE       Describe topmost object
+  CTRL+MIDDLE  Show lines
   RIGHT        Inspect objects (main world)
   SHIFT+RIGHT  Inspect objects (bizarro world)
 

Index: heromesh.h
==================================================================
--- heromesh.h
+++ heromesh.h
@@ -132,10 +132,12 @@
 
 int scrollbar(int*cur,int page,int max,SDL_Event*ev,SDL_Rect*re);
 
 void draw_popup(const unsigned char*txt);
 int modal_draw_popup(const unsigned char*txt);
+
+void draw_lines(int x,int y);
 
 // == class ==
 
 #define CF_PLAYER 0x01
 #define CF_INPUT 0x02

Index: picture.c
==================================================================
--- picture.c
+++ picture.c
@@ -385,10 +385,53 @@
         break;
     }
   }
   return -1;
 }
+
+void draw_lines(int x,int y) {
+  Uint8*pix;
+  int pitch;
+  SDL_Event ev;
+  int xx=(x-1)*picture_size+left_margin+picture_size/2;
+  int yy=(y-1)*picture_size+picture_size/2;
+  set_cursor(XC_cross_reverse);
+  if(xx>0 && yy>0 && xx<screen->w && yy<screen->h) {
+    SDL_LockSurface(screen);
+    pix=screen->pixels;
+    pitch=screen->pitch;
+    // Diagonal
+    for(y=0;y<screen->h;y++) {
+      x=xx-yy+y;
+      if(x>1 && x<screen->w-2) memcpy(pix+y*pitch+x-2,"\xF0\xF8\xF7\xF8\xF0",5);
+      x=xx+yy-y;
+      if(x>1 && x<screen->w-2) memcpy(pix+y*pitch+x-2,"\xF0\xF8\xF7\xF8\xF0",5);
+    }
+    // Vertical
+    if(xx+2<screen->w) for(y=0;y<screen->h;y++) pix[y*pitch+xx+2]=0xF0;
+    if(xx+1<screen->w) for(y=0;y<screen->h;y++) pix[y*pitch+xx+1]=0xF8;
+    for(y=0;y<screen->h;y++) pix[y*pitch+xx]=0xF7;
+    if(xx-1>0) for(y=0;y<screen->h;y++) pix[y*pitch+xx-1]=0xF8;
+    if(xx-2>0) for(y=0;y<screen->h;y++) pix[y*pitch+xx-2]=0xF0;
+    // Horizontal
+    if(yy+2<screen->h) memset(pix+(yy+2)*pitch,0xF0,screen->w);
+    if(yy+1<screen->h) memset(pix+(yy+1)*pitch,0xF8,screen->w);
+    memset(pix+yy*pitch,0xF7,screen->w);
+    if(yy-1>0) memset(pix+(yy-1)*pitch,0xF8,screen->w);
+    if(yy-2>0) memset(pix+(yy-2)*pitch,0xF0,screen->w);
+    SDL_UnlockSurface(screen);
+  }
+  SDL_Flip(screen);
+  while(SDL_WaitEvent(&ev)) switch(ev.type) {
+    case SDL_KEYDOWN: case SDL_MOUSEBUTTONDOWN:
+    case SDL_KEYUP: case SDL_MOUSEBUTTONUP:
+      return;
+    case SDL_QUIT:
+      SDL_PushEvent(&ev);
+      return;
+  }
+}
 
 static Uint16 decide_picture_size(int nwantsize,const Uint8*wantsize,const Uint16*havesize,int n) {
   int i,j;
   if(!nwantsize) fatal("Unable to determine what picture size is wanted\n");
   for(i=0;i<nwantsize;i++) if(havesize[j=wantsize[i]]==n) return j;