📄 xchangegc.html
字号:
<HTML><HEAD><TITLE>Xlib Programming Manual: XChangeGC</TITLE></HEAD><BODY><H1 ALIGN=center>XChangeGC</H1><H2>Syntax</H2><!.IN "XChangeGC" "" "@DEF@"><CODE><PRE>XChangeGC(<B>display</B>, <B>gc</B>, <B>valuemask</B>, <B>values</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; <A HREF="manipulating.html">GC</A> <B>gc</B>; unsigned long <B>valuemask</B>; <A HREF="manipulating.html#XGCValues">XGCValues</A> *<B>values</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>gc</B><TD> Specifies the GC.<TR><TD> <B>valuemask</B><TD> Specifies which components in the GC are to be changed using information in the specified values structure. This argument is the bitwise inclusive OR of zero or more of the validGC component mask bits.<TR><TD> <B>values</B><TD> Specifies any values as specified by the valuemask.</TABLE><H2>Description</H2>The<B>XChangeGC()</B>function changes the components specified by valuemask forthe specified GC.The values argument contains the values to be set.The values and restrictions are the same as for <B><A HREF="XCreateGC.html">XCreateGC()</A></B>.Changing the clip-mask overrides any previous <B><A HREF="convenience-functions/XSetClipRectangles.html">XSetClipRectangles()</A></B>request on the context. Changing the dash-offset or dash-listoverrides any previous <B><A HREF="convenience-functions/XSetDashes.html">XSetDashes()</A></B>request on the context.The order in which components are verified and altered is server-dependent.If an error is generated, a subset of the components may have been altered.<P><B>XChangeGC()</B>can generate<B>BadAlloc</B> ,<B>BadFont</B> ,<B>BadGC</B> ,<B>BadMatch</B> ,<B>BadPixmap</B> ,and<B>BadValue</B>errors.<H2>Diagnostics</H2><TABLE><TR><TD><B>BadAlloc</B><TD> The server failed to allocate the requested source or server memory.<TR><TD><B>BadFont</B><TD>A value for a font argument does not name a defined font (or, in some cases, <B><A HREF="../my-own/gcontext.html">GContext</A></B>).<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>BadPixmap</B><TD> A value for a Pixmap argument does not name a defined Pixmap.<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="../display/display-macros.html#AllPlanes">AllPlanes()</A></B>,<B><A HREF="../graphics/XCopyArea.html">XCopyArea()</A></B>,<B><A HREF="XCopyGC.html">XCopyGC()</A></B>, <B><A HREF="XCreateGC.html">XCreateGC()</A></B>,<B><A HREF="../utilities/regions/XCreateRegion.html">XCreateRegion()</A></B>,<B><A HREF="../graphics/drawing/XDrawArc.html">XDrawArc()</A></B>,<B><A HREF="../graphics/drawing/XDrawLine.html">XDrawLine()</A></B>,<B><A HREF="../graphics/drawing/XDrawRectangle.html">XDrawRectangle()</A></B>,<B><A HREF="../graphics/drawing-text/XDrawText.html">XDrawText()</A></B>,<B><A HREF="../graphics/filling-areas/XFillRectangle.html">XFillRectangle()</A></B>,<B><A HREF="XFreeGC.html">XFreeGC()</A></B>, <B><A HREF="XGContextFromGC.html">XGContextFromGC()</A></B>,<B><A HREF="XGetGCValues.html">XGetGCValues()</A></B>, <B><A HREF="convenience-functions/XQueryBestSize.html">XQueryBestSize()</A></B>,<B><A HREF="convenience-functions/XSetArcMode.html">XSetArcMode()</A></B>,<B><A HREF="convenience-functions/XSetClipOrigin.html">XSetClipOrigin()</A></B>,"<A HREF="manipulating.html">Manipulating Graphics Context/State</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
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -