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<HTML><HEAD><TITLE>Xlib Programming Manual: XDrawLines</TITLE></HEAD><BODY><H1 ALIGN=center>XDrawLines</H1><H2>Syntax</H2><!.IN "XDrawLines" "" "@DEF@"><CODE><PRE>XDrawLines(<B>display</B>, <B>d</B>, <B>gc</B>, <B>points</B>, <B>npoints</B>, <B>mode</B>) <A HREF="../../display/opening.html#Display">Display</A> *<B>display</B>; Drawable <B>d</B>; <A HREF="../../GC/manipulating.html">GC</A> <B>gc</B>; <A HREF="./#XPoint">XPoint</A> *<B>points</B>; int <B>npoints</B>; int <B>mode</B>; </PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>d</B><TD> Specifies the drawable. <TR><TD> <B>gc</B><TD> Specifies the GC.<TR><TD> <B>points</B><TD> Specifies an array of points.<TR><TD> <B>npoints</B><TD> Specifies the number of points in the array.<TR><TD> <B>mode</B><TD> Specifies the coordinate mode. You can pass<B>CoordModeOrigin</B>or<B>CoordModePrevious</B>.</TABLE><H2>Description</H2>The<B>XDrawLines()</B>function uses the components of the specified GC to draw npoints-1 lines between each pair of points (point[i], point[i+1]) in the array of<A HREF="./#XPoint">XPoint</A>structures.It draws the lines in the order listed in the array.The lines join correctly at all intermediate points, and if the first and lastpoints coincide, the first and last lines also join correctly.For any given line, <B>XDrawLines()</B>does not draw a pixel more than once.If thin (zero line-width) lines intersect, the intersecting pixels are drawn multiple times.If wide lines intersect, the intersecting pixels are drawn only once, as thoughthe entire <B><A HREF="../../appendix/a.html#PolyLine">PolyLine</A></B>protocol request were a single, filled shape.<B>CoordModeOrigin</B>treats all coordinates as relative to the origin,and<B>CoordModePrevious</B>treats all coordinates after the first as relative to the previous point.<P><B>XDrawLines()</B>use these <A HREF="../../GC/manipulating.html">GC</A> components:<A HREF="../../GC/manipulating.html#function">function</A>, <A HREF="../../GC/manipulating.html#plane-mask">plane-mask</A>, <A HREF="../../GC/manipulating.html#line-width">line-width</A>,<A HREF="../../GC/manipulating.html#line-style">line-style</A>,<A HREF="../../GC/manipulating.html#cap-style">cap-style</A>,<A HREF="../../GC/manipulating.html#join-style">join-style</A>,<A HREF="../../GC/manipulating.html#fill-style">fill-style</A>,<A HREF="../../GC/manipulating.html#subwindow-mode">subwindow-mode</A>,<A HREF="../../GC/manipulating.html#clip-mask">clip-x-origin</A>,<A HREF="../../GC/manipulating.html#clip-mask">clip-y-origin</A>,and <A HREF="../../GC/manipulating.html#clip-mask">clip-mask</A>.<B>XDrawLines()</B> also uses these <A HREF="../../GC/manipulating.html">GC</A> mode-dependent components:<A HREF="../../GC/manipulating.html#foreground">foreground</A>,<A HREF="../../GC/manipulating.html#background">background</A>,<A HREF="../../GC/manipulating.html#tile">tile</A>,<A HREF="../../GC/manipulating.html#stipple">stipple</A>,<A HREF="../../GC/manipulating.html#tile">tile-stipple-x-origin</A>, <A HREF="../../GC/manipulating.html#tile">tile-stipple-y-origin</A>,<A HREF="../../GC/manipulating.html#dashes">dash-offset</A>,and<A HREF="../../GC/manipulating.html#dashes">dash-list</A>.<P><B>XDrawLine()</B>,can generate<B>BadDrawable</B>,<B>BadGC</B>,<B>BadMatch</B>and<B>BadValue</B>errors.<H2>Diagnostics</H2><TABLE><TR><TD><B>BadDrawable</B><TD>A value for a Drawable argument does not name a defined Window or Pixmap.<TR><TD><B>BadGC</B><TD>A value for a <B><A HREF="../../my-own/gcontext.html">GContext</A></B> argument does not name a defined <B><A HREF="../../my-own/gcontext.html">GContext</A></B>.<TR><TD><B>BadMatch</B><TD>An<B><A HREF="../../window/create.html#InputClass">InputOnly</A></B>window is used as a Drawable.<TR><TD><B>BadMatch</B><TD>Some argument or pair of arguments has the correct type and range but fails to match in some other way required by the request. <TR><TD><B>BadValue</B><TD> Some numeric value falls outside the range of values accepted by the request. Unless a specific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error.</TABLE><H2>See also</H2><B><A HREF="XDrawArc.html">XDrawArc()</A></B>,<B><A HREF="XDrawLine.html">XDrawLine()</A></B>,<B><A HREF="XDrawPoint.html">XDrawPoint()</A></B>,<B><A HREF="XDrawRectangle.html">XDrawRectangle()</A></B>,<B><A HREF="XDrawSegments.html">XDrawSegments()</A></B>,"<A HREF="lines.html">Drawing Single and Multiple Lines</A>".<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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