draw trapezoid

[dantay9]

I am not well versed in GDI+ so I decided to try it out a bit. I am doing ok so far. I used a doublebuffer template by monoceres and switched it up a bit. I am trying to draw a trapezoid and I know you have to use _GDIPlus_GraphicsDrawPolygon. I think all of the points are correct because the vertecies of the trapezoid are correct. My problem is that the two bases aren't flat. They dip into the center of the trapezoid. I am probably missing something really easy. Thanks in advance!

Trapezoid.au3

Edited July 13, 2009 by dantay9

[Malkey]

I am not well versed in GDI+ so I decided to try it out a bit. I am doing ok so far. I used a doublebuffer template by monoceres and switched it up a bit. I am trying to draw a trapezoid and I know you have to use _GDIPlus_GraphicsDrawPolygon. I think all of the points are correct because the vertecies of the trapezoid are correct. My problem is that the two bases aren't flat. They dip into the center of the trapezoid. I am probably missing something really easy. Thanks in advance!

A trapezoid.

;
    Local $Points[5][2] = [[4,0],[25,69],[33,27],[123,27],[131,69]]
;

[dantay9]

Wow. I'll have to see what I was doing wrong. I knew it was easy

Edit: My points were fine, I just put them in the wrong order

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#include <GDIplus.au3>

Global Const $width = 382
Global Const $height = 452
Global $graphics, $bitmap, $backbuffer, $hPenBlack, $hPenRed

$GUI = GUICreate("GDI+", $width, $height)
GUISetState()
Draw($GUI)


While WinExists($GUI)
    While WinActive($GUI)
        $nMsg = GUIGetMsg()
        Switch $nMsg
            Case - 3
                close()
            Case Else
                ReDraw($graphics, $backbuffer, 176, 381, 136)
        EndSwitch
        Sleep(10)
    WEnd
    Sleep(200)
WEnd

Func Draw($hWnd)
    _GDIPlus_Startup()
    $graphics = _GDIPlus_GraphicsCreateFromHWND($hWnd)
    $bitmap = _GDIPlus_BitmapCreateFromGraphics($width, $height, $graphics)
    $backbuffer = _GDIPlus_ImageGetGraphicsContext($bitmap)
    ReDraw($graphics, $backbuffer, 176, 381, 136)
EndFunc   ;==>Draw

Func ReDraw($hBuffer, $hGraphics, $Left, $Bottom, $Length)
    Local $Points[5][2]

    _GDIPlus_GraphicsClear($backbuffer, 0x00F7F7F7)

    $Points[0][0] = 4
    $Points[0][1] = 0

    $Points[1][0] = $Left
    $Points[1][1] = $Bottom
    $Points[2][0] = $Left + 5
    $Points[2][1] = $Bottom - 5
    $Points[3][0] = $Points[1][0] + $Length - 5
    $Points[3][1] = $Bottom - 5
    $Points[4][0] = $Points[1][0] + $Length
    $Points[4][1] = $Bottom

    $Poly = _GDIPlus_GraphicsDrawPolygon($hGraphics, $Points)

    _GDIPlus_GraphicsDrawImageRect($graphics, $bitmap, 0, 0, $width, $height)

EndFunc   ;==>ReDraw

Func close()
    _GDIPlus_GraphicsDispose($backbuffer)
    _GDIPlus_BitmapDispose($bitmap)
    _GDIPlus_GraphicsDispose($graphics)
    _GDIPlus_Shutdown()
    Exit
EndFunc   ;==>close

Edited July 13, 2009 by dantay9