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pathfinding A*

https://www.purebasic.fr/german/viewtopic.php?t=2888

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pathfinding A*

Verfasst: 08.04.2005 21:49
von Criss
Hi zusammen,

versuche nun schon seit Tagen, mich ins Pathfinding A* einzuarbeiten und komme einfach nicht weiter! Ist mir einfach zu hoch! Trotz den Tutorials, schaffe ich es nicht das ganze ins Purebasic zu übersetzen!

Hat das schonmal jemand gemacht? Eventuell ein Code vorhanden, oder jemand Lust einen zu machen oder einen Blitzbasic-Code zu übersetzen?

Wäre megadankbar dafür!

Verfasst: 08.04.2005 23:47
von Kristel
Hier, bitte schön. http://forums.purebasic.com/german/arch ... php?t=4877

Verfasst: 09.04.2005 07:14
von Kaeru Gaman
@Kristel

danke für das alte Posting. evtl. sollte ich doch mal das Archiv nach Schlagworten durchsuchen.

super ist der Link in dem alten Post.
das Tut sieht besser aus, als das auf der Blitz-Site.

Verfasst: 09.04.2005 14:32
von Criss
@Kristel

Danke Dir erstmal! Habe mir den Code nun näher angeschaut und versucht ihn auf die Dimension Höhe 24 x Breite 32 zu ändern!

Das ist leider nicht möglich, da die ganze Routine leider mit Strings arbeitet und es deshalb nur mit einstelligen Zahlen geht!

Siehe: x = Val(Mid(hunt\px, i, 1))

Gibt es keinen Code, der ohne Pointer und mit Variablen anstatt Strings arbeitet?

Verfasst: 09.04.2005 16:43
von Criss
Habe es soeben selber geschafft! Endlich!

Hier der mutierte :D Code:

Code: Alles auswählen

;- Initialize 
If InitSprite() = #False Or InitKeyboard() = #False 
  MessageRequester("Error", "Can't initialize DirectX", 0) 
EndIf 

Structure a_star 
  x.l 
  y.l 
  parentX.l 
  parentY.l 
  gCost.l 
  hCost.l 
EndStructure 

Structure way 
  px.l
  py.l 
EndStructure 

Global enemy.POINT, target.POINT, walkto.POINT 
Global walk.way, hunt.way
Global mapheight, mapwidth

mapheight = 24
mapwidth = 32

Dim Map(mapheight, mapwidth) 

For i = 0 To mapheight - 1
  For j = 0 To mapwidth - 1 
    Read Map(i, j)
  Next
Next 

NewList openPath.a_star() 
NewList closedPath.a_star() 

Declare placeChar(*char.POINT) 
Declare displayAll(txt$) 
Declare.l calcPath(*path.way, *stop.POINT) 
Declare.l chkNode(x, y, stopX, stopY) 
Declare fndPth_a(*strt.POINT, *stop.POINT) 

;- A* procs 
Procedure fndPth_a(*strt.POINT, *stop.POINT) 
  ClearList(openPath()) 
  ClearList(closedPath()) 
  AddElement(openPath()); Add the starting square to the open list. 
  openPath()\x = *strt\x 
  openPath()\y = *strt\y 
  openPath()\parentX = -1 
  openPath()\parentY = -1 
  openPath()\gCost = 0 
  openPath()\hCost = Abs(*strt\x - *stop\x) + Abs(*strt\y - *stop\y) 
  
  While FirstElement(openPath()) 
    cost = openPath()\gCost + openPath()\hCost:linx = 0 
    ForEach openPath(); Look for the lowest F cost square on the open list 
      fCost = openPath()\gCost + openPath()\hCost 
      If cost > fCost:cost = fCost:linx = ListIndex(openPath()):EndIf 
    Next 
    
    SelectElement(openPath(), linx); Switch it to the closed list 
    LastElement(closedPath()) 
    AddElement(closedPath()) 
    CopyMemory(@openPath(), @closedPath(), SizeOf(a_star)) 
    DeleteElement(openPath()) 
    posx = closedPath()\x
    posy = closedPath()\y 
    If posx = *stop\x And posy = *stop\y:Break:EndIf; target found! 
    
    LastElement(openPath()) 
    For i = 1 To 4; Examine squares adjacent to the current square 
      Select i 
        Case 1:If posx > 0:chkNode(posx - 1, posy, *stop\x, *stop\y):EndIf 
        Case 2:If posx < mapheight - 1:chkNode(posx + 1, posy, *stop\x, *stop\y):EndIf 
        Case 3:If posy > 0:chkNode(posx, posy - 1, *stop\x, *stop\y):EndIf 
        Case 4:If posy < mapwidth - 1:chkNode(posx, posy + 1, *stop\x, *stop\y):EndIf 
      EndSelect 
    Next
  Wend 
EndProcedure 

Procedure.l chkNode(x, y, stopX, stopY) 
  If Map(x, y) = 1; If it is not walkable or if it is on the closed list, ignore it 
    ForEach closedPath() 
      If closedPath()\x = x And closedPath()\y = y:ProcedureReturn 0:EndIf 
    Next 
    
    ForEach openPath(); If it is on the open list already, check to see if this path to that square is better, using G cost as the measure 
      If openPath()\x = x And openPath()\y = y 
        LastElement(closedPath()) 
        If closedPath()\gCost + 1 < openPath()\gCost 
          openPath()\gCost   = closedPath()\gCost + 1 
          openPath()\parentX = closedPath()\x 
          openPath()\parentY = closedPath()\y 
          ProcedureReturn 0 
        EndIf 
        ProcedureReturn 0 
      EndIf 
    Next 
    
    LastElement(closedPath()) 
    hCost = Abs(x - target\x) + Abs(y - target\y) 
    LastElement(openPath()) 
    AddElement(openPath()); If it isn’t on the open list, add it to the open list 
    openPath()\gCost   = closedPath()\gCost + 1 
    openPath()\hCost   = hCost 
    openPath()\parentX = closedPath()\x 
    openPath()\parentY = closedPath()\y 
    openPath()\x = x 
    openPath()\y = y 
  EndIf 
EndProcedure 

Procedure.l calcPath(*path.way, *stop.POINT) 
  If CountList(closedPath()) 
    ForEach closedPath() 
      If closedPath()\x = *stop\x And closedPath()\y = *stop\y 
        posx = *stop\x
        posy = *stop\y 
        *path\px = 0
        *path\py = 0
        Break 
      EndIf 
    Next 
    For i= CountList(closedPath()) - 1 To 1 Step -1 
      SelectElement(closedPath(), i) 
      If closedPath()\x = posx And closedPath()\y = posy 
        *path\px = posx
        *path\py = posy
        posx = closedPath()\parentX
        posy = closedPath()\parentY 
      EndIf 
    Next 
    ProcedureReturn #True 
  Else 
    ProcedureReturn #False 
  EndIf 
EndProcedure 

;- Common procs 
Procedure displayAll(txt$) 
  ClearScreen(0, 0, 0) 
  DisplaySprite(0, 0, 0) 
  StartDrawing(ScreenOutput())
  DrawingMode(0)
  Circle((enemy\y * 24) + 12, (enemy\x * 24) + 12, 10, RGB($FF,$00,$00))
  Circle((target\y * 24) + 12, (target\x * 24) + 12, 10, RGB($00,$FF,$00)) 
  DrawingMode(4)
  Circle((enemy\y * 24) + 12, (enemy\x * 24) + 12, 10, RGB($00,$00,$00))
  Circle((target\y * 24) + 12, (target\x * 24) + 12, 10, RGB($00,$00,$00))
  DrawingMode(0)
  Locate(0, 560) 
  DrawingMode(1) 
  FrontColor($00,$00,$00) 
  DrawText(txt$) 
  StopDrawing() 
  FlipBuffers() 
EndProcedure 

Procedure placeChar(*char.POINT) 
  Repeat 
    *char\x = Random(mapheight - 1) 
    *char\y = Random(mapwidth - 1) 
  Until Map(*char\x, *char\y) = 1
EndProcedure 

;- Main 

If OpenScreen(800, 600, 16, "Pathfinding A*") 
  If CreateSprite(0, 24 * mapwidth - 1, 24 * mapheight - 1, 0):Else:End:EndIf 
  StartDrawing(SpriteOutput(0)) 
  For i = 0 To mapheight - 1
    For j = 0 To mapwidth - 1
      If Map(i, j) = 1
        Box(j * 24, i * 24, 24, 24, RGB($AA,$AA,$AA)) 
      Else 
        DrawingMode(0)
        Box(j * 24, i * 24, 24, 24, RGB($FF,$FF,$FF))
        DrawingMode(4)
        ;Box(j * 24, i * 24, 24, 24, RGB($00,$00,$00)) 
        DrawingMode(0)
      EndIf 
    Next j 
  Next i 
  StopDrawing() 
  
  Repeat 
    hunt\px = 0:walk\px = 0 
    placeChar(@enemy) 
    Repeat 
      placeChar(@target) 
    Until Abs(enemy\x - target\x) > 2 Or Abs(enemy\y - target\y) > 2 
    
    displayAll("") 
    
    Repeat 
      
      If enemy\x <> target\x Or enemy\y <> target\y 
        fndPth_a(@enemy, @target) 
        calcPath(@hunt, @target) 
        enemy\x = hunt\px 
        enemy\y = hunt\py
        Delay(100)
      EndIf 
      
      displayAll("ESC - Exit") 
      
      ExamineKeyboard() 
    Until KeyboardPushed(#PB_Key_Escape) Or (enemy\x = target\x And enemy\y = target\y) 
    
    hunt\px = 0 
    displayAll("ESC - Exit   F1 - Start again") 
    Repeat 
      ExamineKeyboard() 
      If KeyboardPushed(#PB_Key_Escape):Break 2:EndIf 
    Until KeyboardPushed(#PB_Key_F1) 
  ForEver 
  
Else 
  MessageRequester("Error", "Can't open 800 x 600 screen", 0) 
EndIf 

End 

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EndDataSection

reanimated little test

Verfasst: 21.10.2008 21:49
von Zefiro_flashparty
:) i add a random re-ubication of target to see how work =) all time


Code: Alles auswählen

; German forum: http://www.purebasic.fr/german/viewtopic.php?t=2888&highlight=
; Author: Criss (updated for PB 4.00 by Andre)
; Date: 09. April 2005
; OS: Windows
; little readapted by Zefiro :D 21/10/2008
; Demo: Yes


;- Initialize 
If InitSprite() = #False Or InitKeyboard() = #False 
  MessageRequester("Error", "Can't initialize DirectX", 0) 
EndIf 

Structure a_star 
  x.l 
  y.l 
  parentX.l 
  parentY.l 
  gCost.l 
  hCost.l 
EndStructure 

Structure way 
  px.l 
  py.l 
EndStructure 

Global enemy.POINT, target.POINT, walkto.POINT 
Global walk.way, hunt.way 
Global mapheight, mapwidth 

mapheight = 24 
mapwidth = 32 

Global Dim Map(mapheight, mapwidth) 

For i = 0 To mapheight - 1 
  For j = 0 To mapwidth - 1 
    Read Map(i, j) 
  Next 
Next 

Global NewList openPath.a_star() 
Global NewList closedPath.a_star() 

Declare placeChar(*char.POINT) 
Declare displayAll(txt$) 
Declare.l calcPath(*path.way, *stop.POINT) 
Declare.l chkNode(x, y, stopX, stopY) 
Declare fndPth_a(*strt.POINT, *stop.POINT) 

;- A* procs 
Procedure fndPth_a(*strt.POINT, *stop.POINT) 
  ClearList(openPath()) 
  ClearList(closedPath()) 
  AddElement(openPath()); Add the starting square to the open list. 
  openPath()\x = *strt\x 
  openPath()\y = *strt\y 
  openPath()\parentX = -1 
  openPath()\parentY = -1 
  openPath()\gCost = 0 
  openPath()\hCost = Abs(*strt\x - *stop\x) + Abs(*strt\y - *stop\y) 
  
  While FirstElement(openPath()) 
    cost = openPath()\gCost + openPath()\hCost:linx = 0 
    ForEach openPath(); Look for the lowest F cost square on the open list 
      fCost = openPath()\gCost + openPath()\hCost 
      If cost > fCost:cost = fCost:linx = ListIndex(openPath()):EndIf 
    Next 
    
    SelectElement(openPath(), linx); Switch it to the closed list 
    LastElement(closedPath()) 
    AddElement(closedPath()) 
    CopyMemory(@openPath(), @closedPath(), SizeOf(a_star)) 
    DeleteElement(openPath()) 
    posx = closedPath()\x 
    posy = closedPath()\y 
    If posx = *stop\x And posy = *stop\y:Break:EndIf; target found! 
    
    LastElement(openPath()) 
    For i = 1 To 4; Examine squares adjacent to the current square 
      Select i 
        Case 1:If posx > 0:chkNode(posx - 1, posy, *stop\x, *stop\y):EndIf 
        Case 2:If posx < mapheight - 1:chkNode(posx + 1, posy, *stop\x, *stop\y):EndIf 
        Case 3:If posy > 0:chkNode(posx, posy - 1, *stop\x, *stop\y):EndIf 
        Case 4:If posy < mapwidth - 1:chkNode(posx, posy + 1, *stop\x, *stop\y):EndIf 
      EndSelect 
    Next 
  Wend 
EndProcedure 

Procedure.l chkNode(x, y, stopX, stopY) 
  If Map(x, y) = 1; If it is not walkable or if it is on the closed list, ignore it 
    ForEach closedPath() 
      If closedPath()\x = x And closedPath()\y = y:ProcedureReturn 0:EndIf 
    Next 
    
    ForEach openPath(); If it is on the open list already, check to see if this path to that square is better, using G cost as the measure 
      If openPath()\x = x And openPath()\y = y 
        LastElement(closedPath()) 
        If closedPath()\gCost + 1 < openPath()\gCost 
          openPath()\gCost   = closedPath()\gCost + 1 
          openPath()\parentX = closedPath()\x 
          openPath()\parentY = closedPath()\y 
          ProcedureReturn 0 
        EndIf 
        ProcedureReturn 0 
      EndIf 
    Next 
    
    LastElement(closedPath()) 
    hCost = Abs(x - target\x) + Abs(y - target\y) 
    LastElement(openPath()) 
    AddElement(openPath()); If it isn’t on the open list, add it to the open list 
    openPath()\gCost   = closedPath()\gCost + 1 
    openPath()\hCost   = hCost 
    openPath()\parentX = closedPath()\x 
    openPath()\parentY = closedPath()\y 
    openPath()\x = x 
    openPath()\y = y 
  EndIf 
EndProcedure 

Procedure.l calcPath(*path.way, *stop.POINT) 
  If CountList(closedPath()) 
    ForEach closedPath() 
      If closedPath()\x = *stop\x And closedPath()\y = *stop\y 
        posx = *stop\x 
        posy = *stop\y 
        *path\px = 0 
        *path\py = 0 
        Break 
      EndIf 
    Next 
    For i= CountList(closedPath()) - 1 To 1 Step -1 
      SelectElement(closedPath(), i) 
      If closedPath()\x = posx And closedPath()\y = posy 
        *path\px = posx 
        *path\py = posy 
        posx = closedPath()\parentX 
        posy = closedPath()\parentY 
      EndIf 
    Next 
    ProcedureReturn #True 
  Else 
    ProcedureReturn #False 
  EndIf 
EndProcedure 

;- Common procs 
Procedure displayAll(txt$) 
  ClearScreen(RGB(0, 0, 0))
  DisplaySprite(0, 0, 0) 
  StartDrawing(ScreenOutput()) 
  
  ;For i = 1 To hunt\px 
  ;  x = hunt\px 
  ;  y = hunt\py 
  ;  Box(y * 24+1, x * 24+1, 22, 22, RGB($C0,$C0,$C0)) 
  ;Next 
  DrawingMode(0) 
  Circle((enemy\y * 24) + 12, (enemy\x * 24) + 12, 10, RGB($FF,$80,$FF)) 
  Circle((target\y * 24) + 12, (target\x * 24) + 12, 10, RGB($00,$A4,$00)) 
  DrawingMode(4) 
  Circle((enemy\y * 24) + 12, (enemy\x * 24) + 12, 10, RGB($00,$00,$00)) 
  Circle((target\y * 24) + 12, (target\x * 24) + 12, 10, RGB($00,$00,$00)) 
  DrawingMode(0) 
  DrawingMode(1) 
  FrontColor(RGB($FF,$FF,$FF))
  DrawText(0, 560, txt$) 
  StopDrawing() 
  FlipBuffers() 
EndProcedure 

Procedure placeChar(*char.POINT) 
  Repeat 
    *char\x = Random(mapheight - 1) 
    *char\y = Random(mapwidth - 1) 
  Until Map(*char\x, *char\y) = 1 
  
EndProcedure 

;- Main 

If OpenScreen(800, 600, 16, "Pathfinding A*") 
  If CreateSprite(0, 24 * mapwidth - 1, 24 * mapheight - 1, 0):Else:End:EndIf 
  StartDrawing(SpriteOutput(0)) 
  For i = 0 To mapheight - 1 
    For j = 0 To mapwidth - 1 
      If Map(i, j) = 1 
        Box(j * 24, i * 24, 24, 24, RGB($AA,$AA,$AA)) 
      Else 
        DrawingMode(0) 
        Box(j * 24, i * 24, 24, 24, RGB($FF,$FF,$FF)) 
        DrawingMode(4) 
        ;Box(j * 24, i * 24, 24, 24, RGB($00,$00,$00)) 
        DrawingMode(0) 
      EndIf 
    Next j 
  Next i 
  StopDrawing() 
  
  Repeat 
    hunt\px = 0:walk\px = 0 
    placeChar(@enemy) 
    

    
    Repeat 
    
      placeChar(@target) 
    Until Abs(enemy\x - target\x) > 2 Or Abs(enemy\y - target\y) > 2 
    
    displayAll("") 
    
    Repeat 
      
      If enemy\x <> target\x Or enemy\y <> target\y 
        fndPth_a(@enemy, @target) 
        calcPath(@hunt, @target) 
        enemy\x = hunt\px 
        enemy\y = hunt\py 
        Delay(100) 
      EndIf 
      
      
      If enemy\x = target\x And enemy\y = target\y 
      
      placeChar(@target) 
      EndIf
      
      displayAll("ESC - Exit") 
      
      ExamineKeyboard() 
    Until KeyboardPushed(#PB_Key_Escape) Or (enemy\x = target\x And enemy\y = target\y) 
    
    hunt\px = 0 
    displayAll("ESC - Exit   F1 - Start again") 
    Repeat 
      ExamineKeyboard() 
      If KeyboardPushed(#PB_Key_Escape):Break 2:EndIf 
    Until KeyboardPushed(#PB_Key_F1) 
  ForEver 
  
Else 
  MessageRequester("Error", "Can't open 800 x 600 screen", 0) 
EndIf 

End 

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code tags added - Kaeru fecit

Re: pathfinding A*

Verfasst: 01.09.2017 00:04
von wpshadow
Hallo,

gibt es zu diesem Thema irgendwo ein aktuelles Beispiel?

LG

Willi

EDIT:

http://forums.purebasic.com/german/view ... athfinding

Hab schon was! :D

Mal sehen, wie weit ich damit komme...
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