x.c

图形学分形演示程序

#include <stdlib.h>
#include "x.h"

void init_X(int scr_w, int scr_h, char title[64])
{
	XSizeHints size_hints;
	XFontStruct *font;
	Colormap cmap;
	
	if ((dpy=XOpenDisplay(NULL)) == NULL)
		perror("Can't connect to X server");

	d = XCreateSimpleWindow
			(dpy,DefaultRootWindow(dpy),0,0,scr_w,scr_h,5,0,0);

		size_hints.flags = PSize | PMinSize | PMaxSize;
		size_hints.min_width = scr_w;
		size_hints.min_height = scr_h;
		size_hints.max_width = scr_w;
		size_hints.max_height = scr_h;
		XSetStandardProperties(dpy,d,title,title,None,0,0,&size_hints);
						
		cmap = DefaultColormap(dpy, XDefaultScreen(dpy) );
		XSetWindowColormap(dpy, d, cmap);

		gc = XCreateGC(dpy,d,0,NULL);
		gc1 = XCreateGC(dpy,d,0,NULL);
		XMapWindow(dpy, d);
		XFlush(dpy);

			buffer = XCreatePixmap(dpy, d, scr_w, scr_h,
							DefaultDepth(dpy,DefaultScreen(dpy)) );
			XSetForeground(dpy,gc,0);
			XFillRectangle (dpy,buffer,gc,0,0,scr_w,scr_h);

			XSelectInput
			(
				dpy, d,
				ExposureMask | KeyPressMask |
				ButtonPressMask | ButtonReleaseMask | Button1MotionMask |
				Button2MotionMask | StructureNotifyMask
			);

		delWin = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
		XSetWMProtocols(dpy, d, &delWin, 1);

		if ((font=XLoadQueryFont(dpy,"fixed"))==NULL)
			perror("XLoadQueryFont");
		else
			XSetFont(dpy,gc,font->fid);
}

void draw_buffer(int scr_x,int scr_y,int scr_w, int scr_h)
{
	XSetTile (dpy, gc1, buffer);
	XSetFillStyle (dpy, gc1, FillTiled);
	XFillRectangle (dpy, d, gc1, scr_x, scr_y, scr_w, scr_h);
}

void clear_buffer(int scr_x,int scr_y,int scr_w, int scr_h)
{
   XSetForeground(dpy,gc,0);
	XFillRectangle(dpy,buffer,gc,scr_x,scr_y,scr_w,scr_h);
}

void close_X(int i)
{
	XFreePixmap(dpy,buffer);
	XFreeGC(dpy, gc);
	XFreeGC(dpy, gc1);
	XCloseDisplay(dpy);
		if(i) exit(0);
}