12. Графика под Windows (Graphics under Windows)

DECLARE SUB CanvasPaint (Sender AS QCanvas)
DECLARE SUB ButtonClick (Sender AS QButton)

' Create bitmap for off-screen use
DIM BitMap AS QBITMAP
    BitMap.Height = 100
    BitMap.Width = 100
    BitMap.Paint(0,0,0,0)

CREATE Form AS QForm
    Center
    Caption = "Simple graphics demonstration"
    CREATE Canvas AS QCanvas
        OnPaint = CanvasPaint
    END CREATE
    CREATE SquareButton AS QButton
        Caption = "Draw Square"
        OnClick = ButtonClick
        Left = 150
    END CREATE
    CREATE CircleButton AS QButton
        Caption = "Draw Circle"
        OnClick = ButtonClick
        Left = 150
        Top = 50
    END CREATE
    CREATE LineButton AS QButton
        Caption = "Draw Line"
        OnClick = ButtonClick
        Left = 150
        Top = 100
    END CREATE
    ShowModal
END CREATE


SUB CanvasPaint (Sender AS QCanvas)
    Sender.Draw(0,0,Bitmap.BMP)
END SUB

SUB ButtonClick (Sender AS QButton)
    SELECT CASE Sender.Caption
        CASE "Draw Square"
            Bitmap.FillRect(10,10,50,50,&HFF0000)
        CASE "Draw Circle"
            Bitmap.Circle(10,60,50,110,&H0000FF,&H0000FF)
        CASE "Draw Line"
            Bitmap.Line(50,50,90,90,&H00FF00)
    END SELECT
    Canvas.Repaint       '-- Tell Canvas to repaint itself.
END SUB