CanvasGadget(#canvas_1, 10, 10, 300, 300) funktioniert nicht

[funkheld]

Hallo, guten Tag.
Warum kommt bitte bei :
CanvasGadget(#canvas_1, 10, 10, 300, 300)
StartDrawing(CanvasOutput(#canvas_1)) kein Bild?

Hier kommt das Bild :
CanvasGadget(0, 10, 10, 300, 300)
StartDrawing(CanvasOutput(0))
......


Danke.
Gruss

Code: Alles auswählen

Global hdc.l,*poly,greenpen,brush
Global i.l,erg.l

Declare api_polygon()

Enumeration
  #window_1  
  #canvas_1
EndEnumeration


*poly=AllocateMemory(32)

If OpenWindow(#window_1  , 0, 0, 400,400, "Polygon", #PB_Window_SystemMenu)
  CanvasGadget(#canvas_1, 10, 10, 300, 300)
  
  Restore poly_p
  For i=0 To 7
    Read.l erg
    PokeL(*poly+i*4,erg)
  Next 
  
  Repeat
    Event = WaitWindowEvent()
    
    If Event = #PB_Event_Gadget And EventGadget() = 0 
      If EventType() = #PB_EventType_LeftButtonDown 
        hdc = StartDrawing(CanvasOutput(#canvas_1))
        api_polygon()  
        StopDrawing()         
      EndIf
    EndIf        
  Until Event = #PB_Event_CloseWindow
EndIf

Procedure api_polygon() 
  brush=CreateSolidBrush_(RGB(255,0,0))
  greenPen=CreatePen_(#PS_SOLID, 2, RGB(0,255,0))
  SelectObject_(hdc,greenPen)
  SelectObject_(hDC, brush) 
  
  MoveToEx_(hdc, 100, 100,0)
  LineTo_(hdc,200,100)
  
  Polygon_(hdc,*poly,4)
EndProcedure 

DataSection
  
  poly_p:
  Data.l -50,-30,50,-30,50,30,-50,30
  
EndDataSection

[Kiffi]

Code: Alles auswählen

If Event = #PB_Event_Gadget And EventGadget() = #canvas_1

[funkheld]

Au Backe...

Danke, da habe ich ja etwas übersehen.

Gruss