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XDrawLine(3X11) manual page
Table of Contents
XDrawLine, XDrawLines,
XDrawSegments, XSegment - draw lines, polygons, and line structure
XDrawLine(display,
d, gc, x1, y1, x2, y2)
Display *display;
Drawable d;
GC gc;
int x1, y1, x2, y2;
XDrawLines(display, d, gc, points, npoints, mode)
Display *display;
Drawable d;
GC gc;
XPoint *points;
int npoints;
int mode;
XDrawSegments(display, d, gc, segments, nsegments)
Display *display;
Drawable d;
GC gc;
XSegment *segments;
int nsegments;
- d
- Specifies the drawable.
- display
- Specifies the connection to the
X server.
- gc
- Specifies the GC.
- mode
- Specifies the coordinate mode. You can
pass CoordModeOrigin or CoordModePrevious.
- npoints
- Specifies the number
of points in the array.
- nsegments
- Specifies the number of segments in the
array.
- points
- Specifies an array of points.
- segments
- Specifies an array of
segments.
- x1
- y1
- x2
- y2
- Specify the points (x1, y1) and (x2, y2) to be connected.
The
XDrawLine function uses the components of the specified GC to draw a
line between the specified set of points (x1, y1) and (x2, y2). It does
not perform joining at coincident endpoints. For any given line, XDrawLine
does not draw a pixel more than once. If lines intersect, the intersecting
pixels are drawn multiple times.
The XDrawLines function uses the components
of the specified GC to draw npoints-1 lines between each pair of points
(point[i], point[i+1]) in the array of XPoint 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, XDrawLines 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 PolyLine
protocol request were a single, filled shape. CoordModeOrigin treats
all coordinates as relative to the origin, and CoordModePrevious treats
all coordinates after the first as relative to the previous point.
The XDrawSegments
function draws multiple, unconnected lines. For each segment, XDrawSegments
draws a line between (x1, y1) and (x2, y2). It draws the lines in the
order listed in the array of XSegment structures and does not perform
joining at coincident endpoints. For any given line, XDrawSegments does
not draw a pixel more than once. If lines intersect, the intersecting
pixels are drawn multiple times.
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 XDrawLines function also uses
the join-style GC component. All three functions also use these GC mode-dependent
components: foreground, background, tile, stipple, tile-stipple-x-origin,
tile-stipple-y-origin, dash-offset, and dash-list.
XDrawLine, XDrawLines,
and XDrawSegments can generate BadDrawable, BadGC, and BadMatch
errors. XDrawLines can also generate a BadValue error.
The
XSegment structure contains:
typedef struct {
short x1, y1, x2, y2;
} XSegment;
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.
- BadDrawable
- A value for a Drawable
argument does not name a defined Window or Pixmap.
- BadGC
- A value for a
GContext argument does not name a defined GContext.
- BadMatch
- An InputOnly
window is used as a Drawable.
- BadMatch
- Some argument or pair of arguments
has the correct type and range but fails to match in some other way required
by the request.
- 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.
XDrawArc(3X11)
, XDrawPoint(3X11)
, XDrawRectangle(3X11)
Xlib - C Language X Interface
Table of Contents
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- crh
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- be_x_old
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- br
- bs
- bug
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- cdo
- ce
- ceb
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- cho
- chr
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- gan
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- glk
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- gv
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- hak
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- hif
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- hr
- hsb
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