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#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
typedef unsigned long ulong;
#define SIZEX 400
#define SIZEX2 (SIZEX/2)
#define SIZEY 400
#define SIZEY2 (SIZEY/2)
static int SCANSCALE =64;
static Display *display;
static Window window,root;
static XImage *src,*dest;
static XEvent ev;
static ulong black,white;
static int width,height,cx,cy;
static int shrink=False;
static GC gc;
int main(int argc, char *argv[])
{
void ScaleImg(XImage *dest, XImage *src);
char str[180];
Window rw,cw;
int rx,ry,cx,cy,bmask;
int f;
if (argc>1)
if (!strcmp(argv[1],"-help"))
{
fprintf(stderr,"Keys :\n");
fprintf(stderr,"LMB - Lower viewing angle\n");
fprintf(stderr,"MMB - Raise viewing angle\n");
fprintf(stderr,"RMB - Quit\n");
}
if (!(display=XOpenDisplay(NULL)))
{
fprintf(stderr,"%s: couldn't open display\n",argv[0]);
exit(1);
}
root=DefaultRootWindow(display);
width=DisplayWidth(display,DefaultScreen(display));
height=DisplayHeight(display,DefaultScreen(display));
window=XCreateSimpleWindow (display,root,0,800,SIZEX,SIZEY,0,0,0);
gc=XCreateGC(display,window,0L,NULL);
XSetBackground(display,gc,white=WhitePixel(display,0));
XSetForeground(display,gc,black=BlackPixel(display,0));
XSetPlaneMask(display,gc,AllPlanes);
XSelectInput (display,window,ButtonPressMask);
XMapWindow(display,window);
while(True)
{
if (XCheckTypedWindowEvent(display,window,ButtonPress,&ev))
switch(ev.xbutton.button)
{
case 1:
SCANSCALE=SCANSCALE>>1;
if (SCANSCALE<1)
SCANSCALE=1;
break;
case 2:
SCANSCALE=SCANSCALE<<1;
break;
case 3:
XCloseDisplay(display);
exit(0);
break;
}
XQueryPointer(display,window,&rw,&cw,&rx,&ry,&cx,&cy,&bmask);
rx-=SIZEX/2;
ry-=SIZEY/2;
if (rx<0)
rx=0;
if (ry<0)
ry=0;
if ((rx+SIZEX)>=width)
rx=width-SIZEX;
if ((ry+SIZEY)>=height)
ry=height-SIZEY;
src=XGetImage(display,root,rx,ry,SIZEX,SIZEY,AllPlanes,ZPixmap);
/* Cheat to create an image we know will be the same as the source...
*/
dest=XGetImage(display,root,0,0,SIZEX,SIZEY,AllPlanes,ZPixmap);
ScaleImg(src,dest);
XPutImage(display,window,gc,dest,0,0,0,0,SIZEX,SIZEY);
XDestroyImage (src);
XDestroyImage (dest);
/* XSync(display,False); */
}
}
int ScaleX (double n, double sc)
{
return SIZEX2-(int)((SIZEX2-n)/sc);
}
int ScaleY (double n, double sc)
{
return SIZEY2-(int)((SIZEY2-n)/sc);
}
void ScaleImg(XImage *src, XImage *dest)
{
int x,y;
double sc;
sc=1.0;
for(y=0;y<SIZEY;y++)
{
for(x=0;x<SIZEX;x++)
if (sc==1)
XPutPixel(dest,x,y,XGetPixel(src,x,y));
else
XPutPixel(dest,x,y,XGetPixel(src,ScaleX((double)x,sc),
ScaleY((double)y,sc)));
sc+=(1.0/SCANSCALE);
}
}
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