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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>
Graphics Contexts
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<div class="SECT1">
<h1 class="SECT1">
<a name="SEC-GC">Graphics Contexts</a>
</h1>
<p>
A <i class="FIRSTTERM">graphics context</i>, or GC, is
simply a set of parameters to be used when drawing (such as
color, clip mask, font, and so on). It is a server-side
resource, just as pixmaps and windows are. GCs reduce the
number of arguments to the GDK drawing functions, and also
reduce the number of parameters passed from client to
server with each drawing request.
</p>
<p>
A graphics context can be created with a <span class=
"STRUCTNAME">GdkGCValues</span> struct, analagous to <span
class="STRUCTNAME">GdkWindowAttr</span>; the struct
contains all the interesting features of a graphics
context, and you pass <tt class="FUNCTION">
gdk_gc_new_with_values()</tt> flags indicating which fields
are valid. The other fields retain their default value. You
can also create an all-default GC with <tt class=
"FUNCTION">gdk_gc_new()</tt> (this is usually easier).
Functions are provided to change GC settings after the GC
is created as well---but remember that each change requires
a message to the X server. These functions are summarized
in <a href="sec-gc.html#FL-GDKGC">Figure 16</a>. The
attributes of a GC, and the flags used as the final
argument to <tt class="FUNCTION">
gdk_gc_new_with_values()</tt>, are summarized in <a href=
"sec-gc.html#TAB-GDKGC">Table 6</a>.
</p>
<p>
All GCs are not interchangeable; they are tied to a
particular depth and visual. The GC's depth and visual must
match the depth and visual of the drawable you are drawing
to. A GC's depth and visual are taken from the <span class=
"STRUCTNAME">GdkWindow*</span> argument to <tt class=
"FUNCTION">gdk_gc_new()</tt>, so the easiest way to handle
this issue is to create the GC with the window you plan to
draw on.
</p>
<p>
<span class="STRUCTNAME">GdkGCValues</span> is a nice
summary of a GC's attributes:
</p>
<table border="0" bgcolor="#E0E0E0" width="100%">
<tr>
<td>
<pre class="PROGRAMLISTING">
typedef struct _GdkGCValues GdkGCValues;
struct _GdkGCValues
{
GdkColor foreground;
GdkColor background;
GdkFont *font;
GdkFunction function;
GdkFill fill;
GdkPixmap *tile;
GdkPixmap *stipple;
GdkPixmap *clip_mask;
GdkSubwindowMode subwindow_mode;
gint ts_x_origin;
gint ts_y_origin;
gint clip_x_origin;
gint clip_y_origin;
gint graphics_exposures;
gint line_width;
GdkLineStyle line_style;
GdkCapStyle cap_style;
GdkJoinStyle join_style;
};
</pre>
</td>
</tr>
</table>
<p>
The <span class="STRUCTNAME">foreground</span> color is the
"pen color" used to draw lines, circles, and other shapes.
The purpose of the <span class="STRUCTNAME">
background</span> color depends on the particular drawing
operation. These colors must be allocated in the current
colormap with <tt class="FUNCTION">gdk_color_alloc()</tt>.
</p>
<p>
The <span class="STRUCTNAME">font</span> field is unused:
in Xlib, it specifies the font to use when drawing text. In
GDK, it used to have the same purpose; but now the GDK
routines for drawing text all require a <span class=
"STRUCTNAME">GdkFont*</span> argument instead. An Xlib
graphics context can only store plain fonts, but a <span
class="STRUCTNAME">GdkFont</span> can also represent a
fontset (used to render some foreign languages). GDK should
probably store a font field in its <span class=
"STRUCTNAME">GdkGC</span> instead of requiring a font
argument to the text-drawing functions, but it doesn't.
</p>
<p>
The <span class="STRUCTNAME">function</span> field
specifies how each pixel being drawn is combined with the
pixel that already exists in the drawable. There are many
possible values, but only two are ever used:
</p>
<ul>
<li>
<p>
<span class="STRUCTNAME">GDK_COPY</span> is the
default. It ignores the existing pixel (just writes the
new pixel over it).
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_XOR</span> combines the
old and new pixels in an invertable way. That is, if
you perform exactly the same <span class="STRUCTNAME">
GDK_XOR</span> operation twice, the first draw is
undone by the second. <span class="STRUCTNAME">
GDK_XOR</span> is often used for "rubberbanding," since
it makes it easy to restore the original contents of
the drawable once rubberbanding is complete.
</p>
</li>
</ul>
<p>
The <span class="STRUCTNAME">fill</span> field determines
how the <span class="STRUCTNAME">tile</span> and <span
class="STRUCTNAME">stipple</span> fields are used. A <span
class="STRUCTNAME">tile</span> is a pixmap with the same
depth as the destination drawable; it is copied over and
over into the destination drawable---the origin of the
first tile is (<span class="STRUCTNAME">ts_x_origin</span>,
<span class="STRUCTNAME">ts_y_origin</span>). A <span
class="STRUCTNAME">stipple</span> is a bitmap (pixmap with
depth 1); stipples are also tiled starting at (<span class=
"STRUCTNAME">ts_x_origin</span>, <span class="STRUCTNAME">
ts_y_origin</span>). Possible <span class="STRUCTNAME">
fill</span> values are:
</p>
<ul>
<li>
<p>
<span class="STRUCTNAME">GDK_SOLID</span> means to
ignore the <span class="STRUCTNAME">tile</span> and
<span class="STRUCTNAME">stipple</span>. Shapes are
drawn in the foreground and background colors.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_TILED</span> means that
shapes are drawn with the tile, instead of the
foreground and background colors. Imagine a tiled
surface underneath your drawable; drawing in <span
class="STRUCTNAME">GDK_TILED</span> mode will scratch
away the contents of the drawable, revealing the tiled
surface underneath.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_STIPPLED</span> is like
<span class="STRUCTNAME">GDK_SOLID</span> with a
bitmask defined by the stipple. That is, bits not set
in the stipple are not drawn.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_OPAQUE_STIPPLED</span>
draws bits set in the stipple with the foreground
color, and bits not set in the stipple with the
background color.
</p>
</li>
</ul>
<p>
Some X servers do not implement the more obscure function
and fill modes very efficiently. Don't be surprised if
using them noticeably slows down drawing.
</p>
<p>
The optional <span class="STRUCTNAME">clip_mask</span> is a
bitmap; only bits set in this bitmap will be drawn. The
mapping from the clip mask to the drawable is determined by
<span class="STRUCTNAME">clip_x_origin</span> and <span
class="STRUCTNAME">clip_y_origin</span>; these define the
drawable coordinates corresponding to (0,0) in the clip
mask. It is also possible to set a clip rectangle (the most
common and useful form of clipping) or a clip region (a
region is an arbitrary area on the screen, typically a
polygon or list of rectangles). To set a clip rectangle,
use <tt class="FUNCTION">gdk_gc_set_clip_rectangle()</tt>:
</p>
<table border="0" bgcolor="#E0E0E0" width="100%">
<tr>
<td>
<pre class="PROGRAMLISTING">
GdkRectangle clip_rect;
clip_rect.x = 10;
clip_rect.y = 20;
clip_rect.width = 200;
clip_rect.height = 100;
gdk_gc_set_clip_rectangle(gc, &clip_rect);
</pre>
</td>
</tr>
</table>
<p>
To turn off clipping, set the clip rectangle, clip region,
or clip mask to <span class="STRUCTNAME">NULL</span>.
</p>
<p>
The <span class="STRUCTNAME">subwindow_mode</span> of a GC
only matters if the drawable is a window. The default
setting is <span class="STRUCTNAME">
GDK_CLIP_BY_CHILDREN</span>; this means that child windows
are not affected by drawing on parent windows. This
preserves the illusion that child windows are "on top" of
parents, and child windows are opaque. <span class=
"STRUCTNAME">GDK_INCLUDE_INFERIORS</span> will draw right
over the top of any child windows, overwriting any graphics
the child windows may contain; normally this mode is not
used. If you do use <span class="STRUCTNAME">
GDK_INCLUDE_INFERIORS</span>, you will probably use <span
class="STRUCTNAME">GDK_XOR</span> as your drawing function,
since it allows you to restore the child windows' previous
contents.
</p>
<p>
<span class="STRUCTNAME">graphics_exposures</span> is a
boolean value which defaults to <span class="STRUCTNAME">
TRUE</span>; it determines whether <tt class="FUNCTION">
gdk_window_copy_area()</tt> sometimes generates expose
events. <a href="sec-gdkevent.html#SEC-EXPOSEEVENTS">the
section called <i>Expose Events</i></a> explained this in
more detail.
</p>
<p>
The final four GC values determine how lines are drawn.
These values are used for drawing lines, including the
borders of unfilled polygons and arcs. The <span class=
"STRUCTNAME">line_width</span> field specifies the width of
a line, in pixels. A line width of 0 specifies a "thin
line"; thin lines are one-pixel lines that can be drawn
very quickly (usually with hardware acceleration), but the
exact pixels drawn depend on the X server in use. For
consistent results, use a width of 1 instead.
</p>
<p>
The <span class="STRUCTNAME">line_style</span> field can
have one of three values:
</p>
<ul>
<li>
<p>
<span class="STRUCTNAME">GDK_LINE_SOLID</span> is the
default; a solid line.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_LINE_ON_OFF_DASH</span>
draws a dashed line with the foreground color, leaving
the "off" parts of the dash blank.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_LINE_DOUBLE_DASH</span>
draws a dashed line in the foreground color, but the
"off" parts of the dash are drawn in the background
color.
</p>
</li>
</ul>
<p>
Dashes are specified with <tt class="FUNCTION">
gdk_gc_set_dashes()</tt>; <span class="STRUCTNAME">
GdkGCValues</span> does not include a field for this. <tt
class="FUNCTION">gdk_gc_set_dashes()</tt> accepts three
arguments:
</p>
<ul>
<li>
<p>
<span class="STRUCTNAME">dash_list</span> is an array
of dash lengths. Even-indexed lengths are "on" dashes;
these are drawn in the foreground color. Odd-indexed
lengths are "off" dashes; they are not drawn or drawn
in the background color, depending on <span class=
"STRUCTNAME">line_style</span>. 0 is not a permitted
value; all lengths must be positive.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">dash_offset</span> is the
index of the first pixel to use in the dash list. That
is, if the dash list specifies 5 pixels "on" and 5
"off", and the offset is 3, the line will begin in the
middle of the "on" dash.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">n</span> is simply the number
of elements in <span class="STRUCTNAME">
dash_list</span>.
</p>
</li>
</ul>
<p>
You might set a whimsical dash pattern this way, for
example:
</p>
<table border="0" bgcolor="#E0E0E0" width="100%">
<tr>
<td>
<pre class="PROGRAMLISTING">
gchar dash_list[] = { 5, 5, 3, 3, 1, 1, 3, 3 };
gdk_gc_set_dashes(gc, 0, dash_list, sizeof(dash_list));
</pre>
</td>
</tr>
</table>
<p>
The default dash list is <span class="STRUCTNAME">{4,
4}</span> with an offset of 0.
</p>
<p>
<a href="sec-gc.html#FIG-DASHRAW">Figure 13</a> shows some
dashed lines drawn with <span class="STRUCTNAME">
GDK_LINE_DOUBLE_DASH</span>. The graphics context's
foreground color is black, and its background color is a
light gray. The first five lines are the default <span
class="STRUCTNAME">{4, 4}</span> dash pattern with offsets
of 0, 1, 2, 3, and 4. Remember that 0 is the default. <a
href="sec-gc.html#FIG-DASHES-DEFAULT">Figure 14</a> shows a
magnified view of these five lines. The last line is the
whimsical dash pattern mentioned above; it's shown
magnified in <a href="sec-gc.html#FIG-DASHES-WHIMSICAL">
Figure 15</a>.
</p>
<div class="FIGURE">
<a name="FIG-DASHRAW"></a>
<p>
<img src="figures/dashes-raw.png">
</p>
<p>
<b>Figure 13. Five dashed lines, with <span class=
"STRUCTNAME">GDK_LINE_DOUBLE_DASH</span></b>
</p>
</div>
<div class="FIGURE">
<a name="FIG-DASHES-DEFAULT"></a>
<p>
<img src="figures/dashes-default.png">
</p>
<p>
<b>Figure 14. Default dash pattern, with varied
offsets</b>
</p>
</div>
<div class="FIGURE">
<a name="FIG-DASHES-WHIMSICAL"></a>
<p>
<img src="figures/dashes-whimsical.png">
</p>
<p>
<b>Figure 15. A complex dash pattern</b>
</p>
</div>
<p>
<span class="STRUCTNAME">cap_style</span> determines how X
draws line endpoints (or dash endpoints, if a line is
dashed). It has four possible values:
</p>
<ul>
<li>
<p>
<span class="STRUCTNAME">GDK_CAP_BUTT</span> is the
default; it means that lines have square ends (as you
might expect).
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_CAP_NOT_LAST</span>
specifies that the last pixel is skipped for one-pixel
lines. It is otherwise the same as <span class=
"STRUCTNAME">GDK_CAP_BUTT</span>.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_CAP_ROUND</span> draws a
small arc on the end of the line, extending beyond the
line's endpoint. The center of the arc is on the
endpoint, and the radius of the arc is one-half the
width of the line. For one-pixel lines, it has no
effect (since there is no way to draw a one-pixel-wide
arc).
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_CAP_PROJECTING</span>
extends the line past its endpoint by one-half its
width. It has no effect on one-pixel lines.
</p>
</li>
</ul>
<p>
The <span class="STRUCTNAME">join_style</span> parameter
affects how lines are connected to one another, when
drawing a polygon or drawing multiple lines in one function
call. If you think of lines as long, thin rectangles, it is
clear that they do not connect smoothly; there is a "notch"
where the two endpoints come together. The three join
styles fill in this notch:
</p>
<ul>
<li>
<p>
<span class="STRUCTNAME">GDK_JOIN_MITER</span> is the
default; it draws a sharp angle where the lines
intersect.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_JOIN_ROUND</span> creates
rounded corners by drawing an arc in the notch.
</p>
</li>
<li>
<p>
<span class="STRUCTNAME">GDK_JOIN_BEVEL</span> creates
a flat corner, filling the notch with the smallest
possible shape.
</p>
</li>
</ul>
<div class="FIGURE">
<a name="FL-GDKGC"></a>
<div class="FUNCSYNOPSIS">
<a name="FL-GDKGC.SYNOPSIS"></a>
<table border="0" bgcolor="#E0E0E0" width="100%">
<tr>
<td>
<pre class="FUNCSYNOPSISINFO">
#include <gdk/gdk.h>
</pre>
</td>
</tr>
</table>
<p>
<code><code class="FUNCDEF">GdkGC* <tt class=
"FUNCTION">gdk_gc_new</tt></code>(GdkWindow* <tt class=
"PARAMETER"><i>window</i></tt>);</code>
</p>
<p>
<code><code class="FUNCDEF">GdkGC* <tt class=
"FUNCTION">
gdk_gc_new_with_values</tt></code>(GdkWindow* <tt
class="PARAMETER"><i>window</i></tt>, GdkGCValues* <tt
class="PARAMETER"><i>values</i></tt>, GdkGCValuesMask
<tt class="PARAMETER"><i>values_mask</i></tt>);</code>
</p>
<p>
<code><code class="FUNCDEF">void <tt class="FUNCTION">
gdk_gc_set_dashes</tt></code>(GdkGC* <tt class=
"PARAMETER"><i>gc</i></tt>, gint <tt class="PARAMETER">
<i>dash_offset</i></tt>, gchar <tt class="PARAMETER">
<i>dash_list</i></tt>, gint <tt class="PARAMETER"><i>
n</i></tt>);</code>
</p>
<p>
<code><code class="FUNCDEF">void <tt class="FUNCTION">
gdk_gc_unref</tt></code>(GdkGC* <tt class="PARAMETER">
<i>gc</i></tt>);</code>
</p>
</div>
<p>
<b>Figure 16. <span class="STRUCTNAME">GdkGC</span></b>
</p>
</div>
<div class="TABLE">
<a name="TAB-GDKGC"></a>
<p>
<b>Table 6. GC Attributes</b>
</p>
<table border="1" bgcolor="#E0E0E0" cellspacing="0"
cellpadding="4" class="CALSTABLE">
<tr>
<th align="LEFT" valign="TOP">
Attribute
</th>
<th align="LEFT" valign="TOP">
<span class="STRUCTNAME">GdkGCValuesMask</span>
</th>
<th align="LEFT" valign="TOP">
Modifying Function
</th>
<th align="LEFT" valign="TOP">
Default Value
</th>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkColor foreground
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_FOREGROUND</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_foreground()</tt>
</td>
<td align="LEFT" valign="TOP">
black
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkColor background
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_BACKGROUND</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_background()</tt>
</td>
<td align="LEFT" valign="TOP">
white
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkFont *font
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_FONT</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_font</tt>
</td>
<td align="LEFT" valign="TOP">
depends on X server
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkFunction function
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_FUNCTION</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_function()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_COPY</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkFill fill
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_FILL</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_fill()</tt>
</td>
<td align="LEFT" valign="TOP">
GDK_SOLID
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkPixmap *tile
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_TILE</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_tile()</tt>
</td>
<td align="LEFT" valign="TOP">
pixmap filled with foreground color (i.e. effectively
none)
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkPixmap *stipple
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_STIPPLE</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_stipple()</tt>
</td>
<td align="LEFT" valign="TOP">
all-bits-on bitmap (i.e. effectively none)
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkPixmap *clip_mask
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_CLIP_MASK</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_clip_mask()</tt>
</td>
<td align="LEFT" valign="TOP">
none
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkSubwindowMode subwindow_mode
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_SUBWINDOW</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_subwindow()</tt>
</td>
<td align="LEFT" valign="TOP">
GDK_CLIP_BY_CHILDREN
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
gint ts_x_origin
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_TS_X_ORIGIN</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_ts_origin()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">0</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
gint ts_y_origin
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_TS_Y_ORIGIN</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_ts_origin()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">0</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
gint clip_x_origin
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_CLIP_X_ORIGIN</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_clip_origin()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">0</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
gint clip_y_origin
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_CLIP_Y_ORIGIN</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_clip_origin()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">0</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
gint graphics_exposures
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_EXPOSURES</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_exposures()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">TRUE</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
gint line_width
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_LINE_WIDTH</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">
gdk_gc_set_line_attributes()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">0</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkLineStyle line_style
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_LINE_STYLE</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">
gdk_gc_set_line_attributes()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_LINE_SOLID</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkCapStyle cap_style
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_CAP_STYLE</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">
gdk_gc_set_line_attributes()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_CAP_BUTT</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
GdkJoinStyle join_style
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_GC_JOIN_STYLE</span>
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">
gdk_gc_set_line_attributes()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">GDK_JOIN_MITER</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
gchar dash_list[]
</td>
<td align="LEFT" valign="TOP">
none
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_dashes()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">{4, 4}</span>
</td>
</tr>
<tr>
<td align="LEFT" valign="TOP">
gint dash_offset
</td>
<td align="LEFT" valign="TOP">
none
</td>
<td align="LEFT" valign="TOP">
<tt class="FUNCTION">gdk_gc_set_dashes()</tt>
</td>
<td align="LEFT" valign="TOP">
<span class="STRUCTNAME">0</span>
</td>
</tr>
</table>
</div>
</div>
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