Legacy Document

Inside Macintosh: Imaging With QuickDraw /

Chapter 3 - QuickDraw Drawing / QuickDraw Drawing Reference

Routines / Drawing Arcs and Wedges

PaintArc

To paint a wedge of the oval that fits inside a rectangle with the graphics pen's pattern and pattern mode, use the PaintArc procedure.

PROCEDURE PaintArc (r:\xDDRect; startAngle,arcAngle: Integer);

r

The rectangle that defines an oval's boundaries.

startAngle

The angle indicating the start of the arc.

arcAngle

The angle indicating the arc's extent.

DESCRIPTION

Using the pen pattern and pattern mode of the current graphics port, the PaintArc procedure draws a wedge of the oval bounded by the rectangle that you specify in the r parameter. As in the FrameArc procedure described in the previous section and illustrated in Figure 3-21, use the startAngle and arcAngle parameters to define the arc of the wedge.

The pen location does not change.

Figure 3-21 Using PaintArc to paint a 45 angle

SPECIAL CONSIDERATIONS

The PaintArc procedure may move or purge memory blocks in the application heap. Your application should not call this procedure at interrupt time.

SEE ALSO

Listing 3-7 on page 3-22 illustrates how to use this procedure.

You can use the FillArc procedure, described next, to draw a wedge with a pattern different from that specified in the pnPat field of the current graphics port.