XDrawPoint(3X11) XLIB FUNCTIONS XDrawPoint(3X11)
NAME
XDrawPoint, XDrawPoints, XPoint - draw points and points
structure
SYNTAX
int XDrawPoint(Display *display, Drawable d, GC gc, int x,
int y);
int XDrawPoints(Display *display, Drawable d, GC gc, XPoint
*points, int npoints, int mode);
ARGUMENTS
d Specifies the drawable.
display Specifies the connection to the X server.
gc Specifies the GC.
mode Specifies the coordinate mode. You can pass Coord-
ModeOrigin or CoordModePrevious.
npoints Specifies the number of points in the array.
points Specifies an array of points.
x
y Specify the x and y coordinates where you want the
point drawn.
DESCRIPTION
The XDrawPoint function uses the foreground pixel and func-
tion components of the GC to draw a single point into the
specified drawable; XDrawPoints draws multiple points this
way. CoordModeOrigin treats all coordinates as relative to
the origin, and CoordModePrevious treats all coordinates
after the first as relative to the previous point.
XDrawPoints draws the points in the order listed in the
array.
Both functions use these GC components: function, plane-
mask, foreground, subwindow-mode, clip-x-origin, clip-y-
origin, and clip-mask.
XDrawPoint can generate BadDrawable, BadGC, and BadMatch
errors. XDrawPoints can generate BadDrawable, BadGC, Bad-
Match, and BadValue errors.
STRUCTURES
The XPoint structure contains:
typedef struct {
short x, y;
XFree86 Version 4.5.0 1
XDrawPoint(3X11) XLIB FUNCTIONS XDrawPoint(3X11)
} XPoint;
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.
DIAGNOSTICS
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 gen-
erate this error.
SEE ALSO
XDrawArc(3X11), XDrawLine(3X11), XDrawRectangle(3X11)
Xlib - C Language X Interface
XFree86 Version 4.5.0 2