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#define INCL_GPIPRIMITIVES
 
LONG GpiBox(hps, cmdControl, pptl, lHRound, lVRound)
HPS hps;            /* presentation-space handle                  */
LONG cmdControl;    /* fill and outline indicator                 */
PPOINTL pptl;       /* address of structure for box corners       */
LONG lHRound;       /* horizontal length of rounding-ellipse axis */
LONG lVRound;       /* vertical length of rounding-ellipse axis   */
 
The GpiBox function draws a rectangular box or a box with rounded corners.
The function draws the box by drawing the outline of a rectangle. The
current position specifies one corner and the point given by pptl specifies
the other. The sides of the box are always parallel to the x and y axes. The
function may fill the interior with the current fill pattern. If a rounded
box is requested, the function rounds the corners of the rectangle using
quarter ellipses. The lHRound and lVRound parameters specify the lengths of
the major and minor axes for the ellipse. If either the lHRound or the
lVRound parameter is zero, no rounding occurs.
 
The current position is unchanged by this function.
 
Parameter   Description
────────────────────────────────────────────────────────────────────────────
 
hps         Identifies the presentation space.
 
cmdControl  Specifies whether to draw the box's interior and/or outline. It
            can be one of the following values:
 
            Value            Meaning
            ────────────────────────────────────────────────────────────────
            DRO_FILL         Fills the interior.
 
            DRO_OUTLINE      Draws the outline.
 
            DRO_OUTLINEFILL  Draws the outline and fills the interior.
 
pptl        Points to the POINTL structure that contains the coordinates of
            a corner of the box.
 
lHRound     Specifies the horizontal length (in world coordinates) of the
            full axis of the ellipse used for rounding at each corner.
 
lVRound     Specifies the vertical length (in world coordinates) of the full
            axis of the ellipse used for rounding at each corner.
 
Return Value
 
The return value is GPI_OK or GPI_HITS if the function is successful (it is
GPI_HITS if the detectable attribute is set for the presentation space and a
correlation hit occurs). The return value is GPI_ERROR if an error occurs.
 
Errors
 
Use the WinGetLastError function to retrieve the error value, which may be
one of the following:
 
     PMERR_INV_BOX_CONTROL
     PMERR_INV_BOX_ROUNDING_PARM
     PMERR_INV_COORDINATE
     PMERR_INV_HPS
     PMERR_PS_BUSY
 
Comments
 
GpiBox can be used in an area bracket but only if DRO_OUTLINE is used. If
the current position is (x0,y0), and pptl is set to (x1,y1), the box is
drawn from (x0,y0) to (x1,y0) to (x1,y1) to (x0,y1) to (x0,y0). This can
affect the way the box is filled when drawn in an area.
 
When correlating a segment, a box drawn using GpiBox will be "hit" if the
box boundary intersects in the pick aperture. If the pick aperture lies
within the box, a hit occurs only if the interior is drawn, that is, only if
the DRO_FILL or DRO_OUTLINEFILL option is used.
 
Example
 
This example calls GpiBox to draw a series of rounded boxes, one inside
another.
 
POINTL ptl = { 100, 100 };
SHORT i;
 
for (i = 0; i < 5; i++)
    GpiBox(hps,            /* handle to a ps        */
        DRO_OUTLINE,       /* fill the interior     */
        (PPOINTL) &ptl,    /* address of the corner */
        i * 10L,           /* horizontal length     */
        i * 10L);          /* vertical length       */
 
See Also
 
GpiBeginArea, GpiEndArea, WinGetLastError, POINTL
 
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