circles on xharbour( fw)

[Silvio]

How create tree concentric circles ?

Regards

[Antonio Linares]

Silvio,

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BOOL Ellipse(
    HDC hdc,   // handle to device context 
    int nLeftRect,   // x-coord. of bounding rectangle's upper-left corner 
    int nTopRect,   // y-coord. of bounding rectangle's upper-left corner  
    int nRightRect,   // x-coord. of bounding rectangle's lower-right corner  
    int nBottomRect    // y-coord. bounding rectangle's f lower-right corner  
   );

[Silvio]

if I have

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 Rectangle( ::hDC, nX, nY, nX + ::nHeight, ( nY += ::nPinWidth ) )

with ellipse

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 ellipse( ::hDC, nX, nY, nX + ::nHeight, ( nY += ::nPinWidth ) )

I try it but it not draw circle concentric

[Enrico Maria Giordano]

This is a working sample:

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#include "Fivewin.ch"


FUNCTION MAIN()

    LOCAL oDlg

    LOCAL nX := 100
    LOCAL nY := 100

    LOCAL nMinRad := 20
    LOCAL nMaxRad := 100

    LOCAL nStep := 10

    DEFINE DIALOG oDlg;
           SIZE 200, 200

    ACTIVATE DIALOG oDlg;
             ON PAINT CIRCLES( oDlg, hDC, nX, nY, nMinRad, nMaxRad, nStep );
             CENTER

    RETURN NIL


#define BRUSH_NULL 5


STATIC FUNCTION CIRCLES( oDlg, hDC, nX, nY, nMinRad, nMaxRad, nStep )

    LOCAL hOldBrush := SELECTOBJECT( hDC, GETSTOCKOBJECT( BRUSH_NULL ) )

    LOCAL i

    FOR i = nMinRad TO nMaxRad STEP nStep
        oDlg:Circle( nX - i, nY - i, i * 2 )
    NEXT

    SELECTOBJECT( hDC, hOldBrush )

    RETURN NIL

EMG