Re: Is there a way of converting plot coords to graph coords?

[j1n3l0 <nel...@gm...>]

I did solve my problem. I measured the distances for each margin and found
that there is a ratio system in place. My findings are summarised below:

=========================================================================

coords [x, y] = [ (lmargin + (abs(xmin - x)/xrange * xlength)), (tmargin +
(abs(ymax - y)/yrange * ylength)) ]

where:
    
    lmargin is the length in pixels of the left margin

        lmargin = 7 * gnuplot lmargin
    
    xrange is the difference between the max and min x values
    
        xrange = abs(xmax - xmin)
    
    xlength is the length of the x axis in pixels
    
        xlength = image_width - (lmargin + rmargin)
    
    tmargin is the length in pixels of the top margin
    
        tmargin = 11 * gnuplot tmargin
    
    yrange is the difference between the max and min y values
    
        yrange = abs(ymax - ymin)
    
    ylength is the length of the y axis in pixels
    
        ylength = image_height - (tmargin + bmargin)

=========================================================================

>From this I was able to construct a class which generates image maps of
Gnuplots on the fly.


Theo Hopman wrote:
> 
> I'm not sure if it completely solves your problem, but new in 4.3 is a 
> feature that allows margins to be specified in terms of fractions of the 
> screen coordinate system. Since you presumably know the size of your 
> terminal's "screen", you can easily find where the borders of the graph 
> area are. This method will not work if you need (for whatever reason) to 
> have automatically calculated margins.
> 

This information will be useful in future. I can substitute my methods for
calculating the margins in pixels accordingly.
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