Example Program

The program below demonstrates a simple example of a transparent overlay. The program creates a transparent overlay window, draws the window border in white, displays a text string in white, and draws a white filled rectangle. The paint type is opaque by default, and the window background is transparent by default. Use the following Makefile to compile and link the program.

simple:

simple.c   cc -I../ -I/usr/openwin/include -o simple simple.c \ 

 -L/usr/openwin/lib -lX11 -lXext

Example 6–1 Transparent Overlay Example Program

#include <stdio.h> #include 

<X11/Xlib.h>  #include “X11/Xmd.h”  #include

<X11/extensions/transovl.h>  #include

<X11/extensions/transovlstr.h> Display       *display;  Window

window;  XSetWindowAttributes       attribs; GC       gc;  XGCValues

      gcvalues; main()  {   display = XOpenDisplay(““);

attribs.override_redirect = True;

attribs.border_pixel = WhitePixel(display,0);

window = XSolarisOvlCreateWindow(display,      DefaultRootWindow(display),

100, 100, 500, 500, 10,      CopyFromParent, InputOutput,CopyFromParent, 

CWBorderPixel | CWOverrideRedirect, &attribs); gcvalues.font =

XLoadFont(display, “fixed”);

gcvalues.foreground =WhitePixel(display, 0);

gc = XCreateGC(display, window, GCFont | GCForeground,&gcvalues);

XMapWindow(display, window); XDrawString(display, window,

gc, 50, 50, “This is a test”, 14);

XFillRectangle(display,window, gc, 70, 70, 100, 100); 

XFlush(display); while   (1);}