Showing posts with label HowTos. Show all posts
Showing posts with label HowTos. Show all posts

Monday, July 16, 2012

pstops tutorial (psutils)

I have recently started to port my game engine GGE to HTML5. So i downloaded javascript & HTML5 tutorials (PDFs) from

But now a days i only keep pocket references for technologies i use instead of heavy books. So i wanted to make a pocket version of those PDFs. I found "pstops" after google'ing, in just an hour i was irritated by the mangled parameters it needed and badly documented manpages & stuffs on internet.

But these two pages made my concept clear and i achieved my task in few minutes.

[REF1] Read this first:

[REF2] Then ( this will make you clear about what exactly pstops does):

My own description ( i assume you have read REF1):
pstops => postscript to postscript converter with desired arrangements, page layouts and sizes.

I will describe this powerful utility by small implementation because that in run accomplishes many people's job.

For experiments please get a ps file of atleast 16 pages. You can convert a PDF into ps by using pdftops utility (its a part of psutils). I am using 23 page file. Lets do some ps conversions.

1. Flip all the pages vertically Or horizontally
pstops '1:0V' 

pstops '1:0H' 

As you can see the parameters of pstops are:

pstops  [ -q ] [ -b ] [ -wwidth ] [ -hheight ] [ -ppaper ] [ -dlwidth ] pagespecs [ infile [ outfile ] ]

Most of us have difficulty in pagespecs parameter only. Which is described below:

pagespecs   = [modulo:]specs
specs          = spec[+specs][,specs]
spec            = [-]pageno[L][R][U][H][V][@scale][(xoff,yoff)]

In our flip example, we used '1:0H', What are these hex like codes? lets dissect -
1 => it tells that we want  to print 1 page of "" in 1 page of (A4 by default).
If we want to print 4 pages in 1 A4 page we have to use '4:0', for 8 we use '8:0'

: sign is followed by SPECS. But we have nothing after 0. It simply means that we want to use original unchanged source pages in output file. With -0 end becomes start and start becomes end page. i.e. page numbers get inverted.

2. Lets print two pages in one side, i.e. total 4 in 1 output page. Portrait mode 
pstops '4:0'
output => [1] [2] [3] [4] [5] [6] Wrote 6 pages, 1250990 bytes

We get 6 pages in output. But, upon seeing why we get only 6 pages printed from source instead of all pages? The answer is simple: Did we specified how and where the pages had to be printed? we told to print 0 only i.e. 1st page ( 0 index => 0+1 page number ) of every block.

You don't know what block is? Please refer to REF1 above. In brief i also write here:
Blocks = total pages in input file / total pages we want in our 1 page of output file

1 block simply means number of input pages we want to be printed in 1 output page, above we told to print only 0th index Or 1st page of every block. That is why only 1st pages were printed.

Below is the proper command to print all pages.
pstops '4:0@0.5(0.0w,0.5h)+2@0.5(0.0w,0.0h),1@0.5(0.0w,0.5h)+3@0.5(0.0w,0.0h)'

It will output 2 portrait pages per side. Lets understand all the parameters:
4: => 4 input pages / 1 output page

0 => 0th index of block i.e. 1st page
(0.0w,0.5h) => move right by 0% of page width. 50% of height. AFAIK the w,h are of source page.
@0.5 => scale to become 50% of original size.

+ => continuing page on 1st side.
2 => 2nd index of block i.e. 3rd page
(0.0w,0.0h) => no movement, just remain at output's Origin i.e. left-bottom. Just like Cartesian coordinates.
@0.5 => scale to become 50% of original size.

1. x,y are offsets, this is what i have understood, they are not exact render start points. Therefore you should have noticed to draw from top we just have to go 0.5h ( half of output page height instead of full height). 

2. I have not used rotations. You should keep in mind that after rotation the origin of that rotated page still remains at its own left-bottom. So the whole output will change after using rotations. Try it:

pstops '4:0L@0.5(0.0w,0.5h)+2L@0.5(0.0w,0.0h),1L@0.5(0.0w,0.5h)+3L@0.5(0.0w,0.0h)'

It outputs blank pages! You know why?
Because when we rotated left (imagine you are holding the paper at left-bottom and rotated it left. Then it goes outside of the output page boundaries. For that you have to translate all pages by full width.

so try this now:

pstops '4:0L@0.5(0.75w,0.5h)+2L@0.5(0.75w,0.0h),1L@0.5(0.75w,0.5h)+3L@0.5(0.75w,0.0h)'

in parameters we have described that 1st side of output page will follow this specification:
pages: 1, 3
and the second back side will follow this: ( separated by comma )
pages: 2, 4

Then all the coming blocks will follow these specifications.

For more details below is a simple illustration: please neglect the quality, i made it quickly to illustrate rather than writing 100 lines. :-)

hope this tutorial will help you to understand how to utilize the power of pstops without Hit n Trials method :-p. Please let me know if you find some bugs or wrong info (if really it is).

Search TAGs:
linux 4-up, make 8 page booklet, linux pstops tutorial, pstops concept, how pstops works, make mini booklets, 8 page booklets 

Tuesday, December 27, 2011

Use android device to connect to internet on PC using USB cable or any wireless source.

I was new to android, and wanted to connect to internet via GPRS/EDGE/3G connections. But unfortunately I couldn't find any modem support in android. In run of demand for a DUN connection I found tethering option in Android phone and found connecting to PC for internet via Android is dead easy!, thanks to tethering, below are the steps and references:-

My devices and setup:
Android version: v2.2, Froyo
Device: ZTE Blade (Or Dell XCD35, Idea Blade in India)
PC: Toshiba Satellite C650 AMD Athlon II P320 CPU, HD4200 ATI card
OS: Windows XP

1. Enable Internet on your Android phone via any source you have access to like GPRS/EDGE/3G data plans.
2. Connect the phone to your Laptop/desktop using USB cable (Otherwise below option will be disabled)
3. Go to phone settings and enable USB tethering :-

Press Home -> press menu -> wireless & networks -> Tethering & portable hotspot -> USB Tethering
Enable this check button.

Once enabled,  If your pc drivers are installed correctly, you will see HSUSB device connected message, remote NDIS adapter device will be shown on your device manager.

Verify the correct setup:
1. Check if your Android device shows BLUE USB icon on the taskbar which opens tethering upon touch event.
2. Open Device manager in windows XP or other OS. Network adapters should show

"Remote NDIS based internet sharing device"

My details are:
Manufacturer: ZTE Corporation
Location: Location 0 (ZTE HSUSB Device)
Control panel => Network Connections => Remote NDIS based internet sharing device

 4. Test internet on your phone if it works, then for sure you will get same speed in your PC.

You can test the speed of your internet by simple command. Open cmd.exe from run dialog and type


below is output from my console:

Pinging [] with 32 bytes of data:

Reply from bytes=32 time=516ms TTL=45
Reply from bytes=32 time=517ms TTL=45
Reply from bytes=32 time=513ms TTL=45
Reply from bytes=32 time=515ms TTL=45

The lower your time is the faster your internet connection will be. EDGE normally shows values between 200 to 700. Values above it are very slow connection. I get ~250 average in low traffic, ~20-30KBps.

Android's USB tethering just means to share internet from your device to other device no matter what the source of your internet is. So we don't need any kind of Dial Up networking support in phones. So this is a universal solution and that's why android don't need DUN :-).

Tethering & Hotspot

Share your mobile data connection:

Windows XP's Android RNDIS device information, tethering, INF file

ZTE Blade drivers:

Plugging Android phone to PC shows a CDROM with their drivers which upon enabling SDCARD gets removed.

EXTRA (part of my marketing):

If above steps have solved your problem and you are happy, and you do not hate games :), please try the games I have developed.

DesiBallGame - My first android game, recently released

 My PlayStore profile:

My website for games:

Sunday, December 16, 2007