Displaying a pixel, one

Jean Wasilewski
1 parent 96d6826d
Showing 1 changed file with 115 additions and 0 deletions Show diff stats
main.c
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+/* 
+	Remember to compile try:
+		1) gcc hi.c -o hi -lX11
+		2) gcc hi.c -I /usr/include/X11 -L /usr/X11/lib -lX11
+		3) gcc hi.c -I /where/ever -L /who/knows/where -l X11
+
+	Brian Hammond 2/9/96.    Feel free to do with this as you will!
+*/
+
+
+/* include the X library headers */
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xos.h>
+
+/* include some silly stuff */
+#include <stdio.h>
+#include <stdlib.h>
+
+/* here are our X variables */
+Display *dis;
+int screen;
+Window win;
+GC gc;
+int width=320;
+int height=240;
+
+/* here are our X routines declared! */
+void init_x();
+void close_x();
+void redraw();
+
+main () {
+	XEvent event;		/* the XEvent declaration !!! */
+	KeySym key;		/* a dealie-bob to handle KeyPress Events */	
+	char text[255];		/* a char buffer for KeyPress Events */
+	Pixmap pmap;
+	XColor col;
+
+	init_x();
+
+	printf("Patte de canard\n");
+	Colormap cmap = DefaultColormap(dis, DefaultScreen(dis));
+	printf("?\n");
+	pmap = XCreatePixmap(dis, win, width, height, DefaultDepth(dis, DefaultScreen(dis)));
+
+	/* look for events forever... */
+	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);
+	
+		if (event.type==Expose && event.xexpose.count==0) {
+		/* the window was exposed redraw it! */
+			redraw();
+		}
+		if (event.type==KeyPress&&
+		    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') {
+				close_x();
+			}
+			printf("You pressed the %c key!\n",text[0]);
+		}
+		if (event.type==ButtonPress) {
+		/* tell where the mouse Button was Pressed */
+			int x=event.xbutton.x,
+			    y=event.xbutton.y;
+
+			//strcpy(text,"X is FUN!");
+			//XSetForeground(dis,gc,rand()%event.xbutton.x%255);
+			//XDrawString(dis,win,gc,x,y, text, strlen(text));
+
+
+			col.red = 128;
+			col.green = 128;
+			col.blue = 0;
+			XAllocColor(dis, cmap, &col);
+			XSetForeground(dis, gc, col.pixel);
+			XDrawPoint(dis,win,gc,x,y);
+		}
+	}
+}
+
+void init_x() {
+/* get the colors black and white (see section for details) */        
+	unsigned long black,white;
+
+	dis=XOpenDisplay((char *)0);
+   	screen=DefaultScreen(dis);
+	black=BlackPixel(dis,screen),
+	white=WhitePixel(dis, screen);
+   	win=XCreateSimpleWindow(dis,DefaultRootWindow(dis),0,0,height,width, 0,black, white);
+	XSetStandardProperties(dis,win,"Howdy","Hi",None,NULL,0,NULL);
+	XSelectInput(dis, win, ExposureMask|ButtonPressMask|KeyPressMask);
+        gc=XCreateGC(dis, win, 0,0);        
+	XSetBackground(dis,gc,white);
+	XSetForeground(dis,gc,black);
+	XClearWindow(dis, win);
+	XMapRaised(dis, win);
+};
+
+void close_x() {
+	XFreeGC(dis, gc);
+	XDestroyWindow(dis,win);
+	XCloseDisplay(dis);	
+	exit(1);				
+};
+
+void redraw() {
+	XClearWindow(dis, win);
+};