My graphic won't redrawn

[oMBRa]

My graphic won't redraw when I click Go

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#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>



Global $pi = 3.14159265358979
Global $a[3]
Global $ALPHA = 30
Global $HEIGHT = 150
$Draw = GUICreate("My Draw")
$input = GUICtrlCreateInput("21", 300, 10, 50, 20)
$updown = GUICtrlCreateUpdown($input)
$Button = GUICtrlCreateButton("Go", 300, 50)
Example()

Func Example()
    Local $msg
    
    MakeDraw()

    Do
        $msg = GUIGetMsg()
        If $msg = $Button Then
            Global $ALPHA = GUICtrlRead($input)
            Draw()
        EndIf

    Until $msg = $GUI_EVENT_CLOSE
EndFunc  ;==>Example


Func MakeDraw()
    Local $x, $z
    

    $a[1] = GUICtrlCreateGraphic(10, 200, 10, 10)
    GUICtrlSetStyle(-1, $SS_NOTIFY)
    
    
    $a[2] = GUICtrlCreateGraphic(0, 0, 10, 10)
    GUICtrlSetStyle(-1, $SS_NOTIFY)
;GUICtrlSetGraphic(-1, $GUI_GR_COLOR, 0, 0x)
    
    Draw()
    GUISetState()
EndFunc  ;==>MakeDraw



Func Draw()
    For $i = 1 To $HEIGHT
        GUICtrlSetGraphic($a[1], $GUI_GR_PIXEL, 0, -$i);altezza
    Next


    $degToRad = $pi / 180
    $z = Tan(Execute('$ALPHA * $degToRad'))
    $z = Execute('$HEIGHT / $z')
    For $i = 1 To $z

        GUICtrlSetGraphic($a[1], $GUI_GR_PIXEL, $i, 0);base
    Next
    $ipotenusa = Sqrt(Execute('$HEIGHT^2 + $z^2'))
    GUICtrlSetGraphic($a[1], $GUI_GR_MOVE, 0, -$HEIGHT)
    GUICtrlSetGraphic($a[1], $GUI_GR_LINE, $z, 0);ipotenusa
;GUICtrlSetGraphic($a[2], $GUI_GR_COLOR, 0, 0x)
    GUICtrlSetGraphic($a[2], $GUI_GR_PIE, Execute('40 + $z - 30'), 200, 20, 180, -$ALPHA)
EndFunc  ;==>Draw

[andybiochem]

You need to tell the graphic control to refresh.

Put this at the bottom of your Draw() function.

GUICtrlSetGraphic($a[1],$GUI_GR_REFRESH)
GUICtrlSetGraphic($a[2],$GUI_GR_REFRESH)

[oMBRa]

ok, but now it overlaps the previous triangle

[andybiochem]

Two options here:

1) delete the graphic controls and re-create them each time the button is clicked

2) look here

[oMBRa]

Two options here:

1) delete the graphic controls and re-create them each time the button is clicked

2) look here

I managed to do it with deleting and re-creating