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<HTML><HEAD><TITLE>Xlib Programming Manual: Drawing Points, Lines, Rectangles, and Arcs</TITLE></HEAD><BODY><H1 ALIGN=center>8.3 Drawing Points, Lines, Rectangles, and Arcs</H1>Xlib provides functions that you can use to draw:<UL><P><LI><A HREF="points.html">A single point or multiple points</A><P><LI><A HREF="lines.html">A single line or multiple lines</A><P><LI><A HREF="rectangles.html">A single rectangle or multiple rectangles</A><P><LI><A HREF="arcs.html">A single arc or multiple arcs</A></UL><P>Some of the functions described in the following sectionsuse these structures:<A NAME="XSegment"></A><P><!.IN "XSegment" "" "@DEF@"><PRE><CODE>typedef struct { short x1, y1, x2, y2;} XSegment;</PRE></CODE><A NAME="XPoint"></A><P><!.IN "XPoint" "" "@DEF@"><PRE><CODE>typedef struct { short x, y;} XPoint;</PRE></CODE><A NAME="XRectangle"></A><P><!.IN "XRectangle" "" "@DEF@"><PRE><CODE>typedef struct { short x, y; unsigned short width, height;} XRectangle;</PRE></CODE><A NAME="XArc"></A><P><!.IN "XArc" "" "@DEF@"><PRE><CODE>typedef struct { short x, y; unsigned short width, height; short angle1, angle2; /* Degrees * 64 */} XArc;</PRE></CODE><P>All x and y members are signed integers.The width and height members are 16-bit unsigned integers.You should be careful not to generate coordinates and sizesout of the 16-bit ranges, because the protocol only has 16-bit fieldsfor these values.<H5 ALIGN=right><I>Next: <A HREF="points.html">Drawing Single and Multiple Points</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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