Table of Contents
XDrawPoint, XDrawPoints,
XPoint - draw points and points structure
- 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);
- 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.
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.
The XPoint structure contains:
0
0>=40 .vs 0u
0<=39 .vs 0p
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.
- 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)
, XDrawLine(3X11)
, XDrawRectangle(3X11)
Xlib - C Language X Interface
Table of Contents