Attachment 226611 Details for Bug 331321 – Little Xlib test program

Little Xlib test program

xlines.c (text/x-csrc), 1.32 KB, created by Pat Kane on 2007-10-14 12:30:50 UTC

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Creator: Pat Kane

Created: 2007-10-14 12:30:50 UTC

Size: 1.32 KB

patch

obsolete

>#include <math.h>
>#include <X11/Xlib.h>
>/*
> * Draw 0 and 1 width lines
> * 
> * build with:  gcc xlines.c -lX11 -o xlines -lm 
> *
> * Pat Kane  2007
> */
>#define WIDTH	 512
>#define HEIGHT	 256
>
>#define NSTEPS 64
>
>Display * dpy;
>Window    win;
>XEvent    event;
>int	  scrn;
>
>DrawLines(int xo, int yo, int width)
>{
>  float     w, fx, fy;
>  int       x1, y1, x2, y2;
>
>  XSetLineAttributes(dpy, DefaultGC(dpy, scrn), width, LineSolid, CapNotLast, JoinMiter);
>  x1 = xo; y1 = yo;
>  for ( w = 0; w < (M_PI * 2); w += M_PI/NSTEPS)  
>  {
>    fx = sin(w); fy = cos(w);
>    x2 = x1 + (fx * WIDTH/4);
>    y2 = y1 + (fy * HEIGHT/2);
>    XDrawLine (dpy, win, DefaultGC(dpy, scrn), x1, y1, x2, y2);
>  }
>}
>
>
>main()
>{
>
>  if ((dpy = XOpenDisplay("")) == NULL)
>  {
>      printf("Can not connect to X server.\n");
>      exit(1);
>  }
>  scrn = DefaultScreen(dpy);
>
>  win = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy),
>			    0, 0,
>			    WIDTH, HEIGHT,
>			    0,
>			    BlackPixel(dpy,scrn), WhitePixel(dpy,scrn));
>
>  XSelectInput(dpy, win, KeyPressMask|ExposureMask|ButtonPressMask);
>
>  XMapRaised(dpy,win);
>
>  /* wait for first expose event */
>  XWindowEvent(dpy, win, ExposureMask, &event);   
>
>  DrawLines(1*WIDTH/4, HEIGHT/2, 0);
>  DrawLines(3*WIDTH/4, HEIGHT/2, 1);
>
>  /* wait for key or button */
>  XWindowEvent(dpy, win, KeyPressMask|ButtonPressMask, &event); 
>}

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Attachments on bug 331321: 226611