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/*** START MAIN.H ***/
/* http://www.geocities.com/jeff_louie/x11/helloworld.htm* */
/*
* main.h
* TestX
*
* Created by Jeff Louie on Tue Feb 03 2004.
* Copyright (c) 2004 __MyCompanyName__. All rights reserved.
*
*/
#ifndef MAIN_H
#define MAIN_H 1
#include <iostream>
#include <stdlib.h>
/* include the X library headers */
#include <X11/Xlib.h>
#include <X11/Xos.h>
#include <X11/Xutil.h>
class Main
{
public:
// constructor
Main(int argc, char* const argv[]);
// virtual ~Main();
private:
/* here are our X variables */
Display* dis;
int screen;
Window win;
GC gc;
/* here are our X routines declared! */
void init_x();
void close_x();
void redraw();
int delay(int i);
};
#endif
/*** END MAIN.H ***/
/*** START MAIN.CPP ***/
// modified from Brian Hammond's Howdy program at
// http://www.insanityengine.com/doc/x11/xintro.html
// jeff louie 02.05.2004
int main(int argc, char* const argv[])
{
Main m(argc, argv);
return 0;
}
// Main::~Main() {;};
Main::Main(int argc, char* const argv[])
{
XEvent event; // XEvent declaration
KeySym key; // KeyPress Events
char text[255]; // char buffer for KeyPress Events
init_x();
// event loop
while (1) {
// get the next event and stuff it into our event variable.
// Note: only events we set the mask for are detected!
XNextEvent(dis, &event);
switch (event.type) {
int x;
int y;
case Expose:
if (event.xexpose.count == 0) {
redraw();
}
break;
case KeyPress:
if (XLookupString(&event.xkey, text, 255, &key, 0) == 1) {
// use the XLookupString routine to convert the invent
// KeyPress data into regular text. Weird but necessary...
if ((text[0] == 'q') || (text[0] == 'Q')) {
close_x();
} else {
// echo key press
printf("You pressed the %c key!\n", text[0]);
}
}
break;
case ButtonPress:
// get cursor position
x = event.xbutton.x;
y = event.xbutton.y;
strcpy(text, "X is FUN!");
XSetForeground(dis, gc, rand() % event.xbutton.x % 255);
// draw text at cursor
XDrawString(dis, win, gc, x, y, text, strlen(text));
break;
default:
printf("Unhandled event.\n");
}
}
}
void Main::init_x()
{
unsigned long black, white;
dis = XOpenDisplay(NULL);
screen = DefaultScreen(dis);
black = BlackPixel(dis, screen), white = WhitePixel(dis, screen);
win = XCreateSimpleWindow(dis, DefaultRootWindow(dis), 0, 0, 300, 300, 5,
black, white);
XSetStandardProperties(dis, win, "Hello World", "Hi", None, NULL, 0, NULL);
XSelectInput(dis, win, ExposureMask | ButtonPressMask | KeyPressMask);
// get Graphics Context
gc = XCreateGC(dis, win, 0, 0);
XSetBackground(dis, gc, white);
XSetForeground(dis, gc, black);
XClearWindow(dis, win);
XMapRaised(dis, win);
};
void Main::close_x()
{
XFreeGC(dis, gc);
XDestroyWindow(dis, win);
XCloseDisplay(dis);
exit(1);
};
void Main::redraw()
{
XClearWindow(dis, win);
};
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