NAME
XSetLineAttributes, XSetDashes - GC convenience routines SYNTAX int XSetLineAttributes(Display *display, GC gc, unsigned int linewidth, int linestyle, int capstyle, int joinstyle); int XSetDashes(Display *display, GC gc, int dashoffset, char dashlist[], int n); ARGUMENTS
capstyle Specifies the line-style and cap-style you want to set for the specified GC. You can pass CapNotLast, CapButt, CapRound, or CapProjecting.
dashlist Specifies the dash-list for the dashed line-style you want to set for the specified GC. dashoffset
Specifies the phase of the pattern for the dashed line-style you want to set for the specified GC. display Specifies the connection to the X server. gc Specifies the GC. joinstyle
Specifies the line join-style you want to set for the speci‐ fied GC. You can pass JoinMiter, JoinRound, or JoinBevel. linestyle
Specifies the line-style you want to set for the specified GC. You can pass LineSolid, LineOnOffDash, or LineDou‐ bleDash. linewidth
Specifies the line-width you want to set for the specified GC. n Specifies the number of elements in dashlist. DESCRIPTION The XSetLineAttributes function sets the line drawing components in the specified GC. XSetLineAttributes can generate BadAlloc, BadGC, and BadValue errors.
The XSetDashes function sets the dash-offset and dash-list attributes for dashed line styles in the specified GC. There must be at least one element in the specified dashlist, or a BadValue error results. The initial and alternating elements (second, fourth, and so on) of the dashlist are the even dashes, and the others are the odd dashes. Each element specifies a dash length in pixels. All of the elements must be
nonzero, or a BadValue error results. Specifying an odd-length list is equivalent to specifying the same list concatenated with itself to pro‐
duce an even-length list.
The dash-offset defines the phase of the pattern, specifying how many
pixels into the dash-list the pattern should actually begin in any sin‐ gle graphics request. Dashing is continuous through path elements com‐
bined with a join-style but is reset to the dash-offset between each sequence of joined lines. The unit of measure for dashes is the same for the ordinary coordinate system. Ideally, a dash length is measured along the slope of the line, but implementations are only required to match this ideal for horizontal and vertical lines. Failing the ideal semantics, it is sug‐ gested that the length be measured along the major axis of the line. The major axis is defined as the x axis for lines drawn at an angle of
between -45 and +45 degrees or between 135 and 225 degrees from the x axis. For all other lines, the major axis is the y axis. XSetDashes can generate BadAlloc, BadGC, and BadValue errors. DIAGNOSTICS BadAlloc The server failed to allocate the requested resource or server memory. BadGC A value for a GContext argument does not name a defined GCon‐ text. BadValue 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. SEE ALSO XCreateGC(3), XQueryBestSize(3), XSetArcMode(3), XSetClipOrigin(3), XSetFillStyle(3), XSetFont(3), XSetState(3), XSetTile(3)
Xlib - C Language X Interface X Version 11 libX11 1.6.5 XSetLineAttributes(3)