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