Title:           [C] xrectsel (drawterm)
Author:          Twilypastes
Pastebin link:   http://pastebin.com/eeLRBed6
First Edit:      Thursday 1st of January 2015 09:24:45 AM CDT
Last Edit:       Last edit on: Thursday 5th of March 2015 01:29:52 PM CDT

"xrectsel" is used to draw an rectangle and return the X,Y,W,H
"drawterm" is used w/ a hotkey to trigger xrectsel and spawn the terminal at given position
 
instructions on compilation and installation below xrectsel.c
 
 
 
 
** note: slop "https://github.com/naelstrof/slop" can be used instead of xrectsel
              (see 'drawterm' below xrectsel.c)
 
 
 
 
 
/*  ----------------------------- xrectsel.c ------------------------------- */
#include<stdio.h>
#include<stdlib.h>
#include<X11/Xlib.h>
#include<X11/cursorfont.h>
 
int main(void)
{
  int rx = 0, ry = 0, rw = 0, rh = 0;
  int rect_x = 0, rect_y = 0, rect_w = 0, rect_h = 0;
  int btn_pressed = 0, done = 0;
 
  XEvent ev;
  Display *disp = XOpenDisplay(NULL);
 
  if(!disp)
    return EXIT_FAILURE;
 
  Screen *scr = NULL;
  scr = ScreenOfDisplay(disp, DefaultScreen(disp));
 
  Window root = 0;
  root = RootWindow(disp, XScreenNumberOfScreen(scr));
 
  Cursor cursor, cursor2;
  cursor = XCreateFontCursor(disp, XC_left_ptr);
  cursor2 = XCreateFontCursor(disp, XC_lr_angle);
 
  XGCValues gcval;
  gcval.foreground = XWhitePixel(disp, 0);
  gcval.function = GXxor;
  gcval.background = XBlackPixel(disp, 0);
  gcval.plane_mask = gcval.background ^ gcval.foreground;
  gcval.subwindow_mode = IncludeInferiors;
 
  GC gc;
  gc = XCreateGC(disp, root,
                 GCFunction | GCForeground | GCBackground | GCSubwindowMode,
                 &gcval);
 
  /* this XGrab* stuff makes XPending true ? */
  if ((XGrabPointer
       (disp, root, False,
        ButtonMotionMask | ButtonPressMask | ButtonReleaseMask, GrabModeAsync,
        GrabModeAsync, root, cursor, CurrentTime) != GrabSuccess))
    printf("couldn't grab pointer:");
 
  if ((XGrabKeyboard
       (disp, root, False, GrabModeAsync, GrabModeAsync,
        CurrentTime) != GrabSuccess))
    printf("couldn't grab keyboard:");
 
  while (!done) {
    while (!done && XPending(disp)) {
      XNextEvent(disp, &ev);
      switch (ev.type) {
        case MotionNotify:
        /* this case is purely for drawing rect on screen */
          if (btn_pressed) {
            if (rect_w) {
              /* re-draw the last rect to clear it */
              XDrawRectangle(disp, root, gc, rect_x, rect_y, rect_w, rect_h);
            } else {
              /* Change the cursor to show we're selecting a region */
              XChangeActivePointerGrab(disp,
                                       ButtonMotionMask | ButtonReleaseMask,
                                       cursor2, CurrentTime);
            }
            rect_x = rx;
            rect_y = ry;
            rect_w = ev.xmotion.x - rect_x;
            rect_h = ev.xmotion.y - rect_y;
 
            if (rect_w < 0) {
              rect_x += rect_w;
              rect_w = 0 - rect_w;
            }
            if (rect_h < 0) {
              rect_y += rect_h;
              rect_h = 0 - rect_h;
            }
            /* draw rectangle */
            XDrawRectangle(disp, root, gc, rect_x, rect_y, rect_w, rect_h);
            XFlush(disp);
          }
          break;
        case ButtonPress:
          btn_pressed = 1;
          rx = ev.xbutton.x;
          ry = ev.xbutton.y;
          break;
        case ButtonRelease:
          done = 1;
          break;
      }
    }
  }
  /* clear the drawn rectangle */
  if (rect_w) {
    XDrawRectangle(disp, root, gc, rect_x, rect_y, rect_w, rect_h);
    XFlush(disp);
  }
  rw = ev.xbutton.x - rx;
  rh = ev.xbutton.y - ry;
  /* cursor moves backwards */
  if (rw < 0) {
    rx += rw;
    rw = 0 - rw;
  }
  if (rh < 0) {
    ry += rh;
    rh = 0 - rh;
  }
 
  XCloseDisplay(disp);
 
  printf("%d %d %d %d\n",rw,rh,rx,ry);
 
  return EXIT_SUCCESS;
}
 
/*  ----------------------------- xrectsel.c ------------------------------- */
 
COMPILE:      $ gcc -Wall -lX11 xrectsel.c -o xrectsel
Copy to PATH: $ sudo cp xrectsel /usr/local/bin/
 
SOURCE:  https://bbs.archlinux.org/viewtopic.php?id=85378
 
 
 
 
 
 
/*  ----------------------------- drawterm ------------------------------- */
#!/bin/bash
#
#   Author:         Twily                                           2015
#   Description:    Spawn a new terminal window inside a drawn rectangle
#   Requires:       slop (or xrectsel: http://pastebin.com/eeLRBed6), urxvt
#   Usage:          Bind hotkey to $ sh ./drawterm
#
#   Note:           if using compton w/ shadows, exclude "class_g = 'slop'"
#
 
M=2                 # slop border width
 
REC=$(slop -t 0 -b $M -c 1,1,1,1 -f "%w %h %x %y" --nokeyboard) || exit 1
#REC=$(xrectsel) || exit 1
 
IFS=' ' read -r W H X Y <<< "$REC"
 
aX=$(( $X - $M )) && aY=$(( $Y - $M ))
aW=$(( $W + ( $M * 2 ) )) && aH=$(( $H + ( $M * 2 ) ))
 
if [ "$W" -gt "1" ]; then
    # Calculate width and height to block/font size
    let W=$(( $W / 7 ))-2
    let H=$(( $H / 15 ))-1
 
    urxvt -g $W"x"$H"+"$X"+"$Y &
 
    for i in {0..49}; do # timeout
        if ps -p $! >/dev/null; then
            sleep .1
 
            wmctrl -r :ACTIVE: -e 0,$aX,$aY,$aW,$aH
            break
        fi
    done
fi
 
exit 0
/*  ----------------------------- drawterm ------------------------------- */
 
 
 
 
for "Snap grid" see http://twily.info/snap.grid#Openbox
(+"grid" and "ext.grid" for more tiling scripts)
 
 
 
/*  ----------------------------- snap.all ------------------------------- */
#!/bin/bash
#
#   Author:         Twily                                                       2015
#   Description:    Uses 'snap.grid' to snap all visible windows into a virtual grid
#   Requires:       xdotool, snap.grid
#   Usage:          $ sh ./snap.all
#
 
for w in $(xdotool search --onlyvisible --desktop $(xdotool get_desktop) --name ""); do
    sh ~/scripts/snap.grid $w
done
 
exit 0
/*  ----------------------------- snap.all ------------------------------- */