Re: [Gnuplot-info] How to plot directly in unit of pixels by gnuplot?

[Thomas S. <t.s...@fz...>]

did you deactivate the 'Smooth images when zoomed' feature in 'eog'?


Fayer Michael wrote:
> 
> That's exactly what I have tried and failed. What I really want to draw
> is thousands of thin (big width, small height) rectangles without
> overlapping but connected (no space between them vertically, but can
> have space horizontally). They are in different colors and have
> different width. If I use this kind of relative coordinates (eg.
> 100/640), the rectangles will overlap vertically a little bit (see code
> below). That's why I wonder if any methods can use absolute coordinates
> in pixels to avoid overlapping.
> 
> The code:
> 
> set cbrange [0:6]
> set style rect fs solid noborder
> set xrange [0:1]
> set yrange [0:1]
> set key off
> unset xtics
> unset ytics
> unset colorbox
> set palette defined (0 "black",1 "yellow")
> set tmargin 0
> set lmargin 0
> set bmargin 0
> set rmargin 0
> set terminal png size 10,10
> set output "tt.png"
> set obj rect from 0,0 to 0.5,0.5 fc palette cb 3
> set obj rect from 1,1 to 0.5,0.5 fc palette cb 6
> plot -1 lc palette cb 1 # invisible, to show content above
> replot
> 
> By using 'eog', one can zoom in the png file up to 2000%, and see two
> rectangles are overlapped (although mathmetically they should not
> overlap) and the edges/frames also are not 'tidy'.
> 
>> Date: Tue, 20 Jul 2010 10:32:23 -0700 (PDT)
>> From: Thomas Sefzick <t.s...@fz...>
>> Subject: Re: [Gnuplot-info] How to plot directly in unit of pixels by
>> 	gnuplot?
>> To: gnu...@li...
>> Message-ID: <292...@ta...>
>> Content-Type: text/plain; charset=us-ascii
>> 
>> 
>> use the screen coordinates when defining objects:
>> 
>> set term gif size 640,480
>> set obj 1 rect from screen 100./640.,20./480. to screen
>> 200./640.,30./480.
>> fc palette cb 3
>> set out 'plot.gif'
>> plot sin(x)
>> set out
>> 
>> 
>> Fayer Michael wrote:
>> > 
>> > Except for canvas size, gnuplot uses relative unit to plot. Now I want
>> > to draw directly in unit of pixels. For example, I want something like:
>> >   set obj rect from 100,20 to 200,30 fc palette cb 3
>> > 
>> > where 100,20 and 200,30 are in pixel.
>> > 
>> > I set xrange/yrange to something like 1:640 and 1:480, and set all
>> > margins to 0. However, the results were still not exactly what I want.
>> > And it's a dirty hack. Anyone knows a clean one?
>> > 
>> > I noticed low-level Perl package Term::Gnuplot, but it's not convenient
>> > for high-level plotting.
>> > 
>> > Fayer
> 
> 
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