XDrawPoint
Section: XLIB FUNCTIONS (3)
Updated: libX11 1.6.4
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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
CoordModeOrigin
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 function 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,
BadMatch,
and
BadValue
errors.
STRUCTURES
The
XPoint
structure contains:
typedef struct {
short x, y;
} 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 generate this error.
SEE ALSO
XDrawArc(3),
XDrawLine(3),
XDrawRectangle(3)
Xlib - C Language X Interface
Index
- NAME
-
- SYNTAX
-
- ARGUMENTS
-
- DESCRIPTION
-
- STRUCTURES
-
- DIAGNOSTICS
-
- SEE ALSO
-
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