NAME
XSetLineAttributes, XSetDashes - GC convenience routines
SYNTAX
int XSetLineAttributes(Display *_d_i_s_p_l_a_y, GC _g_c, unsigned
int _l_i_n_e___w_i_d_t_h, int _l_i_n_e___s_t_y_l_e, int _c_a_p___s_t_y_l_e, int
_j_o_i_n___s_t_y_l_e);
int XSetDashes(Display *_d_i_s_p_l_a_y, GC _g_c, int
_d_a_s_h___o_f_f_s_e_t, char _d_a_s_h___l_i_s_t[], int _n);
ARGUMENTS
-
_c_a_p___s_t_y_l_e
Specifies the line-style and cap-style you want to set for the specified GC.
-
You can pass
_C_a_p_N_o_t_L_a_s_t,
_C_a_p_B_u_t_t,
_C_a_p_R_o_u_n_d,
or
_C_a_p_P_r_o_j_e_c_t_i_n_g.
-
_d_a_s_h___l_i_s_t
Specifies the dash-list for the dashed line-style
-
you want to set for the specified GC.
-
_d_a_s_h___o_f_f_s_e_t
Specifies the phase of the pattern for the dashed line-style you want to set
-
for the specified GC.
-
_d_i_s_p_l_a_y
Specifies the connection to the X server.
-
-
_g_c
Specifies the GC.
-
-
_j_o_i_n___s_t_y_l_e
Specifies the line join-style you want to set for the specified GC.
-
You can pass
_J_o_i_n_M_i_t_e_r,
_J_o_i_n_R_o_u_n_d,
or
_J_o_i_n_B_e_v_e_l.
-
_l_i_n_e___s_t_y_l_e
Specifies the line-style you want to set for the specified GC.
-
You can pass
_L_i_n_e_S_o_l_i_d,
_L_i_n_e_O_n_O_f_f_D_a_s_h,
or
_L_i_n_e_D_o_u_b_l_e_D_a_s_h.
-
_l_i_n_e___w_i_d_t_h
Specifies the line-width you want to set for the specified GC.
-
-
_n
Specifies the number of elements in dash_list.
-
DESCRIPTION
The
_X_S_e_t_L_i_n_e_A_t_t_r_i_b_u_t_e_s
function sets the line drawing components in the specified GC.
_X_S_e_t_L_i_n_e_A_t_t_r_i_b_u_t_e_s
can generate
_B_a_d_A_l_l_o_c,
_B_a_d_G_C,
and
_B_a_d_V_a_l_u_e
errors.
The
_X_S_e_t_D_a_s_h_e_s
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 dash_list,
or a
_B_a_d_V_a_l_u_e
error results.
The initial and alternating elements (second, fourth, and so on)
of the dash_list 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
_B_a_d_V_a_l_u_e
error results.
Specifying an odd-length list is equivalent to specifying the same list
concatenated with itself to produce 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 single graphics request.
Dashing is continuous through path elements combined 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 suggested 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.
_X_S_e_t_D_a_s_h_e_s
can generate
_B_a_d_A_l_l_o_c,
_B_a_d_G_C,
and
_B_a_d_V_a_l_u_e
errors.
DIAGNOSTICS
-
_B_a_d_A_l_l_o_c
-
The server failed to allocate the requested resource or server memory.
-
_B_a_d_G_C
-
A value for a GContext argument does not name a defined GContext.
-
_B_a_d_V_a_l_u_e
-
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(3X11),
XQueryBestSize(3X11),
XSetArcMode(3X11),
XSetClipOrigin(3X11),
XSetFillStyle(3X11),
XSetFont(3X11),
XSetState(3X11),
XSetTile(3X11)
_X_l_i_b _- _C _L_a_n_g_u_a_g_e _X _I_n_t_e_r_f_a_c_e