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<HTML><HEAD><TITLE>Xlib Programming Manual: XDrawLine</TITLE></HEAD><BODY><H1 ALIGN=center>XDrawLine</H1><H2>Syntax</H2><!.IN "XDrawLine" "" "@DEF@"><CODE><PRE>XDrawLine(<B>display</B>, <B>d</B>, <B>gc</B>, <B>x1</B>, <B>y1</B>, <B>x2</B>, <B>y2</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>; int <B>x1</B>, <B>y1</B>, <B>x2</B>, <B>y2</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>x1</B><BR> <B>y1</B><BR> <B>x2</B><BR> <B>y2</B><TD> Specify the points (x1, y1) and (x2, y2) to be connected.</TABLE><H2>Description</H2>The<B>XDrawLine()</B>function uses the components of the specified GC todraw a line between the specified set of points (x1, y1) and (x2, y2).It does not perform joining at coincident endpoints.For any given line, <B>XDrawLine()</B>does not draw a pixel more than once.If lines intersect, the intersecting pixels are drawn multiple times. <P><B>XDrawLine()</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#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>XDrawLine()</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> ,and<B>BadMatch</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. </TABLE><H2>See also</H2><B><A HREF="XDrawArc.html">XDrawArc()</A></B>,<B><A HREF="XDrawLines.html">XDrawLines()</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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