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- XDrawLine(3X11) XLIB FUNCTIONS XDrawLine(3X11)
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- NNAAMMEE
- XDrawLine, XDrawLines, XDrawSegments, XSegment - draw
- lines, polygons, and line structure
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- SSYYNNTTAAXX
- XDrawLine(_d_i_s_p_l_a_y, _d, _g_c, _x_1, _y_1, _x_2, _y_2)
- Display *_d_i_s_p_l_a_y;
- Drawable _d;
- GC _g_c;
- int _x_1, _y_1, _x_2, _y_2;
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- XDrawLines(_d_i_s_p_l_a_y, _d, _g_c, _p_o_i_n_t_s, _n_p_o_i_n_t_s, _m_o_d_e)
- Display *_d_i_s_p_l_a_y;
- Drawable _d;
- GC _g_c;
- XPoint *_p_o_i_n_t_s;
- int _n_p_o_i_n_t_s;
- int _m_o_d_e;
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- XDrawSegments(_d_i_s_p_l_a_y, _d, _g_c, _s_e_g_m_e_n_t_s, _n_s_e_g_m_e_n_t_s)
- Display *_d_i_s_p_l_a_y;
- Drawable _d;
- GC _g_c;
- XSegment *_s_e_g_m_e_n_t_s;
- int _n_s_e_g_m_e_n_t_s;
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- AARRGGUUMMEENNTTSS
- _d Specifies the drawable.
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- _d_i_s_p_l_a_y Specifies the connection to the X server.
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- _g_c Specifies the GC.
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- _m_o_d_e Specifies the coordinate mode. You can pass
- _C_o_o_r_d_M_o_d_e_O_r_i_g_i_n or _C_o_o_r_d_M_o_d_e_P_r_e_v_i_o_u_s.
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- _n_p_o_i_n_t_s Specifies the number of points in the array.
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- _n_s_e_g_m_e_n_t_s Specifies the number of segments in the array.
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- _p_o_i_n_t_s Specifies an array of points.
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- _s_e_g_m_e_n_t_s Specifies an array of segments.
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- _x_1
- _y_1
- _x_2
- _y_2 Specify the points (x1, y1) and (x2, y2) to be
- connected.
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- DDEESSCCRRIIPPTTIIOONN
- The _X_D_r_a_w_L_i_n_e function uses the components of the speci-
- fied GC to draw a line between the specified set of points
- (x1, y1) and (x2, y2). It does not perform joining at
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- X Version 11 Release 6.1 1
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- XDrawLine(3X11) XLIB FUNCTIONS XDrawLine(3X11)
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- coincident endpoints. For any given line, _X_D_r_a_w_L_i_n_e does
- not draw a pixel more than once. If lines intersect, the
- intersecting pixels are drawn multiple times.
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- The _X_D_r_a_w_L_i_n_e_s function uses the components of the speci-
- fied GC to draw npoints-1 lines between each pair of
- points (point[i], point[i+1]) in the array of _X_P_o_i_n_t
- 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 last points coincide, the
- first and last lines also join correctly. For any given
- line, _X_D_r_a_w_L_i_n_e_s 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 though the
- entire _P_o_l_y_L_i_n_e protocol request were a single, filled
- shape. _C_o_o_r_d_M_o_d_e_O_r_i_g_i_n treats all coordinates as relative
- to the origin, and _C_o_o_r_d_M_o_d_e_P_r_e_v_i_o_u_s treats all coordi-
- nates after the first as relative to the previous point.
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- The _X_D_r_a_w_S_e_g_m_e_n_t_s function draws multiple, unconnected
- lines. For each segment, _X_D_r_a_w_S_e_g_m_e_n_t_s draws a line
- between (x1, y1) and (x2, y2). It draws the lines in the
- order listed in the array of _X_S_e_g_m_e_n_t structures and does
- not perform joining at coincident endpoints. For any
- given line, _X_D_r_a_w_S_e_g_m_e_n_t_s does not draw a pixel more than
- once. If lines intersect, the intersecting pixels are
- drawn multiple times.
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- All three functions use these GC components: function,
- plane-mask, line-width, line-style, cap-style, fill-style,
- subwindow-mode, clip-x-origin, clip-y-origin, and clip-
- mask. The _X_D_r_a_w_L_i_n_e_s function also uses the join-style GC
- component. All three functions also use these GC mode-
- dependent components: foreground, background, tile, stip-
- ple, tile-stipple-x-origin, tile-stipple-y-origin, dash-
- offset, and dash-list.
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- _X_D_r_a_w_L_i_n_e, _X_D_r_a_w_L_i_n_e_s, and _X_D_r_a_w_S_e_g_m_e_n_t_s can generate
- _B_a_d_D_r_a_w_a_b_l_e, _B_a_d_G_C, and _B_a_d_M_a_t_c_h errors. _X_D_r_a_w_L_i_n_e_s can
- also generate a _B_a_d_V_a_l_u_e error.
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- SSTTRRUUCCTTUURREESS
- The _X_S_e_g_m_e_n_t structure contains:
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- typedef struct {
- short x1, y1, x2, y2;
- } XSegment;
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- All x and y members are signed integers. The width and
- height members are 16-bit unsigned integers. You should
- be careful not to generate coordinates and sizes out of
- the 16-bit ranges, because the protocol only has 16-bit
- fields for these values.
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- X Version 11 Release 6.1 2
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- XDrawLine(3X11) XLIB FUNCTIONS XDrawLine(3X11)
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- DDIIAAGGNNOOSSTTIICCSS
- _B_a_d_D_r_a_w_a_b_l_e
- A value for a Drawable argument does not name a
- defined Window or Pixmap.
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- _B_a_d_G_C A value for a GContext argument does not name a
- defined GContext.
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- _B_a_d_M_a_t_c_h An _I_n_p_u_t_O_n_l_y window is used as a Drawable.
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- _B_a_d_M_a_t_c_h Some argument or pair of arguments has the cor-
- rect type and range but fails to match in some
- other way required by the request.
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- _B_a_d_V_a_l_u_e Some numeric value falls outside the range of
- values accepted by the request. Unless a spe-
- cific 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.
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- SSEEEE AALLSSOO
- XDrawArc(3X11), XDrawPoint(3X11), XDrawRectangle(3X11)
- _X_l_i_b _- _C _L_a_n_g_u_a_g_e _X _I_n_t_e_r_f_a_c_e
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- X Version 11 Release 6.1 3
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