jheinen/GR.jl

Plotting for Julia based on GR, a framework for visualisation applications

Josef Heinen

@jheinen

@zaz1588 Right now, the contour lines are calculated internally and can't be accessed from the (Julia) REPL.

zaz1588

@zaz1588

ok. thanks

Viktor Petukhov

@VPetukhov

Hi! I'm trying to plot a thin line and save it as a png, but looks like with png GR has restriction for minimal thickness.
Code below produces the same result for any linewidth <= 1.0.

GR.beginprint("test_gr.png")
GR.setlinewidth(0.01)
GR.polyline(x, y)
GR.show()
GR.endprint()

Though the line is definitely thicker than 1 pixel. If I save it to svg, everything works well. Is there any way to fix this?
I was trying to use Ghostscript plugin by adding ENV["GKS_USE_GS_PNG"] = 1, but it fails with "Ghostscript support not compiled in".

Josef Heinen

@jheinen

Thanks for the hint. This is a bug in the GR Cairo plugin. I will fix it ASAP ...

Josef Heinen

@jheinen

The problem ist fixed in GR#master - a MR is on the way ...

Viktor Petukhov

@VPetukhov

Wow, it would save me a whole lot of time for transition to pyplot. Thank you for the fast reaction, @jheinen! However, I tried the latest master commit (jheinen/GR.jl@3c81a12), and the problem is still there. Not sure if it's the right one though, as it only adds setspace3d function.

Josef Heinen

@jheinen

You will have to update the run-time: ENV["GRDIR"]=""; ] build GR

Viktor Petukhov

@VPetukhov

Indeed, it works now perfectly. Thank you so much!

Alex Chernyshyov Kara

@ak202

Hi, great work on this, but i'm just curious if there is any way to automatically resize output to fit the dimensions of the Qt window? This exists to at least some extent already, but it looks like the plot gets fit into a perfect square and then that square is what gets resized.

Josef Heinen

@jheinen

GR keeps the aspect ratio. If you want to use the full Qt window, you will have to set both the workstation viewport and the workstation window (as in examples\qml_ex.jl)

Alex Chernyshyov Kara

@ak202

I guess I was asking two questions without realizing it, sorry. One thing I was interested in is having the aspect ratio of the plot change automatically, and I'll look into your example if I have time to play around with that. Thanks!

The second question is how to fill the window even when keeping the aspect ratio. This seems to work correctly if the plot is a perfect square i.e. size = (500, 500), but taller/wider rectangles will not fill the window even in a way that would preserve the aspect ratio. The more extreme the ratio, the smaller the plot is.

Alex Chernyshyov Kara

@ak202

For example, if I have a landscape oriented window and have size = (500,500), it will fill vertically but not horizontally as one would expect, but then increasing the width variable will not increase the plot's width but instead decreases its height (also font size), which can create a lot of blank space

Josef Heinen

@jheinen

I understand what you intend to do - it's possible with GR but I should probably find a more convenient way to chose it ...

xinzhicaishu

@xinzhicaishu

Hi, I'm a newer in Julia, so the question below may somewhat stupid, my question is, is there a convenient way to set custom colormaps in contour plotting?

photor

@photor

How do I set aspect ratio to give the same scaling along the three axes of a three-dimensional plot? Thanks.

I have the same question, any answers? Thanks.

Sebastian Skejø

@sebastianskejoe

Hi! I'm having some problems with the padding around axis labels when using plots.jl and non-default plot size, which I pretty sure comes down to a miscalculation of the label dimensions. However, to propose a fix, I first need to understand how the padding is computed and to do that I first need to understand what gr_inqtext() returns. I don't think the documentation mentions it and it's not immediately clear to me from reading the c-code.

Josef Heinen

@jheinen

This example demonstrates how inqtext works:

using GR

selntran(0)

settextfontprec(232, 3)
settextalign(2, 3)
chh = 0.072

for phi in LinRange(0, 2pi, 360)
    clearws()
    setcharheight(chh)
    setcharup(sin(phi), cos(phi))
    text(0.5, 0.5, "Hello World")
    tbx, tby = inqtext(0.5, 0.5, "Hello World")
    fillarea(tbx, tby)
    updatews()
end

There is a similar example for LaTeX math formulas in the GR.jl repo. See here.

Josef Heinen

@jheinen

You don't have to care about alignment. See this code snippet:

using GR

hor_align = Dict("Left" => 1, "Center" => 2, "Right" => 3)
vert_align = Dict("Top" => 1, "Cap" => 2, "Half" => 3, "Base" => 4, "Bottom" => 5)

selntran(0)
setcharheight(0.024)

for angle in 0:360

  setcharup(sin(-angle * pi/180), cos(-angle * pi/180))
  setmarkertype(2)
  clearws()

  for halign in keys(hor_align)
    for valign in keys(vert_align)
      settextalign(hor_align[halign], vert_align[valign])
      x = -0.1 + hor_align[halign] * 0.3;
      y = 1.1 - vert_align[valign] * 0.2;
      s = halign * "\n" * valign * "\n" * "third line"
      polymarker([x], [y])
      text(x, y, s)
      tbx, tby = inqtext(x, y, s)
      fillarea(tbx, tby)
    end
  end

  updatews()
end

Sebastian Skejø

@sebastianskejoe

Thanks! And tbx and tby are given as percentages of the window, right?

Sebastian Skejø

@sebastianskejoe

Any idea why plot(rand(100), size=(600,400)) and plot(rand(100), size=(300,400)) gives different tby? I don't see why changing the x-size would affect the y-size of the text.

Josef Heinen

@jheinen

All viewport limits (and text or marker heights) are internally handled as normalized device coordinates. Otherwise, text rotation/scaling or window resize operations would not be consistent (on different output devices).

Viktor Petukhov

@VPetukhov

Hi @jheinen, could you please comment on transiting GR to BinaryBuilder (jheinen/GR.jl#339 )? That's the only thing I need to build transferable binaries of my package, so I'd be happy to help with whatever is needed to get this done.

Josef Heinen

@jheinen

@VPetukhov : You can set ENV["JULIA_GR_PROVIDER"] = "BinaryBuilder" (in GR#master), but there are still some issues.

Josef Heinen

@jheinen

Isn't a dockerized version a "transferable binary" ? See https://mybinder.org/v2/gh/jheinen/GR.jl/master

Viktor Petukhov

@VPetukhov

Thanks, I'll check that!

Isn't a dockerized version a "transferable binary"

Not really. It requires docker to be installed and is also trickier to use than just running a binary.

CheverDing

@dingzhw

This is probably related to Plots. As a workaround, you can force GR to use GKSTerm as the default output device using the GKSwstype environment (in your script or in your shell):
ENV["GKSwstype"]="gksqt"

I was using Julia 1.2.0 in Win 10 . and run into the problem that when I plot with GR it show the error message that

GKS: X11 support not compiled in

the command I quote is useful, thanks!

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