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XDrawPoint, XDrawPoints, XPoint - draw points and points structure
XDrawPoint(display, d, gc, x, y)
Display *display;
Drawable d;
GC gc;
int x, y;
XDrawPoints(display, d, gc, points, npoints, mode)
Display *display;
Drawable d;
GC gc;
XPoint *points;
int npoints;
int mode;
Specifies the drawable.
Specifies the connection to the X server.
Specifies the GC.
Specifies the coordinate mode. You can pass
CoordModeOrigin
or
CoordModePrevious.
Specifies the number of points in the array.
Specifies an array of points.
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:
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.
A value for a Drawable argument does not name a defined Window
or Pixmap.
A value for a GContext argument does not name a defined GContext.
An
InputOnly
window is used as a Drawable.
Some argument or pair of arguments has the correct type and
range but fails to match in some other way required by the request.
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