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A graph plotting app for GNOME

License: GNU General Public License v3.0

Python 92.26% GLSL 7.07% Shell 0.66%

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plots's Issues

Option to increase line width

Hi
The plots lines are very narrow and hard to see.
It is good to add an option to increse its width.
Thanks!

Set limits of how much the user can zoom in

Right now the user can zoom in a lot in the application making it so that you can get buggy graphics(appearing on scales smaller than 5e-36)
This is probably a limitation of GTK

Kooha-02-03-2022-09-52-35.mp4

Zooming out too far causes Plots to crash

I can easily reproduce this by spinning up my scroll wheel and letting it do its thing for a few seconds. Here's the traceback:

$ com.github.alexhuntley.Plots 
/app/lib/python3.9/site-packages/plots/graph.py:162: RuntimeWarning: overflow encountered in multiply
  graph_extent = 2*self.viewport/self.viewport[0]*self.scale
Traceback (most recent call last):
  File "/app/lib/python3.9/site-packages/plots/graph.py", line 148, in gl_render
    self.render()
  File "/app/lib/python3.9/site-packages/plots/graph.py", line 175, in render
    major_grid, minor_grid = self.major_grid(pixel_extent[0])
  File "/app/lib/python3.9/site-packages/plots/graph.py", line 85, in major_grid
    exponent = math.floor(math.log10(abs(min_extent)))
OverflowError: cannot convert float infinity to integer

Add the possibility to choose another letter as main variable

Default one is x which lies in R. I'd like to choose, e.g., t which lies in [1, 3) or k in R \ { 0 }

readme: flatpak-pip-generator snippet does not work as-is

I followed the instructions and tried to use the extension-less pyhon file, but that didn't work:

python3 flatpak-pip-generator --requirements-file=flatpak-requirements.txt --no-build-isolation

The snippet only worked for me after renaming the file and using this command:

python3 flatpak-pip-generator.py --requirements-file=flatpak-requirements.txt --no-build-isolation

Tested on Ubuntu 20.04

Question about stack

Please feel free to close.

Nice app!

I would like to create a similar app to print candle stick graphs.

I just like to know what stack you are using.

To me it looks like you are using Python and GTK (3 or 4?).

How do you create plots in GTK? I have tried to find some library for graphs/plots in GTK but I haven't found any.

How do you find the general experience with Python and GTK?

What tools/IDE are using for development and creating the UI?

Thx!

Migration to GTK 4.0 / Libadwaita

Interested to know if migration to GTK 4.0 or Libadwaita, as a replacement for Handy, is in the development roadmap. This is more of a feature request more than anything.

Blue Screen

Hello! I install the program in Linux Mint 20.1 way PPA and don't work, appears a blue screen.

Crash on update to 0.8.0

OS: Fedora 36
Desktop: Gnome 42.5 (under Xorg)
Graphics: NVIDIA GeForce GTX 1650 SUPER (with NVIDIA drivers)

Traceback

Traceback (most recent call last):
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 221, in update_shader
    attempt(good + bad + unknown)
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 216, in attempt
    self.gl_area.update_fragment_shader(formulae)
  File "/app/lib/python3.9/site-packages/plots/graph.py", line 270, in update_fragment_shader
    fragment_shader = shaders.compileShader(
  File "/app/lib/python3.9/site-packages/OpenGL/GL/shaders.py", line 235, in compileShader
    raise ShaderCompilationError(
OpenGL.GL.shaders.ShaderCompilationError: ("Shader compile failure (0): b'0(88) : error C0153: floating point constant overflow\\n'", [b'/*\n   Copyright 2021 Alexander Huntley\n\n   This file is part of Plots.\n\n   Plots is free software: you can redistribute it and/or modify\n   it under the terms of the GNU General Public License as published by\n   the Free Software Foundation, either version 3 of the License, or\n   (at your option) any later version.\n\n   Plots is distributed in the hope that it will be useful,\n   but WITHOUT ANY WARRANTY; without even the implied warranty of\n   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n   GNU General Public License for more details.\n\n   You should have received a copy of the GNU General Public License\n   along with Plots.  If not, see .\n*/\n\n#version 330 core\nin vec2 graph_pos;\nout vec4 rgba;\n\nuniform vec2 pixel_extent;\nuniform float scale;\nuniform float major_grid;\nuniform float minor_grid;\nuniform float samples;\nuniform float line_thickness;\nuniform vec3 fg_color;\nuniform vec3 bg_color;\n\n#define pi 3.141592653589793\n#define e 2.718281828459045\n\n#define ln(x) log(x)\n#define lg(x) log2(x)\n#define log_base(b, x) (log(x)/log(b))\n#define sec(x) (1.0/cos(x))\n#define csc(x) (1.0/sin(x))\n#define cosec(x) csc(x)\n#define cot(x) (1.0/tan(x))\n#define arcsin(x) asin(x)\n#define arccos(x) acos(x)\n#define arctan(x) atan(x)\n#define asec(x) acos(1.0/(x))\n#define acsc(x) asin(1.0/(x))\n#define acosec(x) acsc(x)\n#define acot(x) (atan(1.0/(x)) - ((x) > 0 ? 0.0 : pi))\n#define arcsec(x) asec(x)\n#define arccsc(x) acsc(x)\n#define arccosec(x) acsc(x)\n#define arccot(x) acot(x)\n#define sech(x) (1.0/cosh(x))\n#define csch(x) (1.0/sinh(x))\n#define cosech(x) csch(x)\n#define coth(x) (1.0/tanh(x))\n#define asech(x) acosh(1.0/(x))\n#define acsch(x) asinh(1.0/(x))\n#define acosech(x) acsch(x)\n#define acoth(x) atanh(1.0/(x))\n#define sgn(x) sign(x)\n#define sinc(x) (sin(x)/(x))\n\nfloat rand(vec2 co){\n    // implementation found at: lumina.sourceforge.net/Tutorials/Noise.html\n    return 2*fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453) - 1;\n}\n\nfloat zmod(float x, float y) {\n    // mod(x,y), but centered on zero\n    return mod(x + y/2, y) - y/2;\n}\n\nfloat factorial(float x) {\n    float res = 1;\n    for (float i = 1; i <= x; i++)\n        res *= i;\n    return res;\n}\n\nfloat mypow(float x, float y) {\n    if (x >= 0)\n        return pow(x, y);\n    else if (floor(y) == y) {\n        return int(y) % 2 == 0 ? pow(-x, y) : -pow(-x, y);\n    }\n    return 1e999;\n}\n\n\n\n\n\nvoid main() {\n    vec3 color = bg_color;\n    vec3 formula_color = vec3(0);\n    float sample_extent = line_thickness*pixel_extent.x;\n    float step = sample_extent / samples;\n    float jitter = .4;\n\n    \n    {\n        \n    }\n    \n\n    float axis_width = pixel_extent.x;\n    vec3 minor_color = mix(fg_color, bg_color, 0.6);\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.x, minor_grid))));\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.y, minor_grid))));\n    vec3 major_color = mix(fg_color, bg_color, 0.4);\n    color = mix(major_color, color, smoothstep(axis_width, axis_width*1.05, abs(zmod(graph_pos.x, major_grid))));\n    color = mix(major_color, color, smoothstep(axis_width, axis_width*1.05, abs(zmod(graph_pos.y, major_grid))));\n    vec3 axis_color = fg_color;\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.x)));\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.y)));\n    rgba = vec4(color, 1);\n}'], GL_FRAGMENT_SHADER)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):

File "/app/lib/python3.9/site-packages/plots/plots.py", line 224, in update_shader

attempt(good + unknown)

File "/app/lib/python3.9/site-packages/plots/plots.py", line 216, in attempt

self.gl_area.update_fragment_shader(formulae)

File "/app/lib/python3.9/site-packages/plots/graph.py", line 270, in update_fragment_shader

fragment_shader = shaders.compileShader(

File "/app/lib/python3.9/site-packages/OpenGL/GL/shaders.py", line 235, in compileShader

raise ShaderCompilationError(

OpenGL.GL.shaders.ShaderCompilationError: ("Shader compile failure (0): b'0(88) : error C0153: floating point constant overflow\n'", [b'/\n   Copyright 2021 Alexander Huntley\n\n   This file is part of Plots.\n\n   Plots is free software: you can redistribute it and/or modify\n   it under the terms of the GNU General Public License as published by\n   the Free Software Foundation, either version 3 of the License, or\n   (at your option) any later version.\n\n   Plots is distributed in the hope that it will be useful,\n   but WITHOUT ANY WARRANTY; without even the implied warranty of\n   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n   GNU General Public License for more details.\n\n   You should have received a copy of the GNU General Public License\n   along with Plots.  If not, see https://www.gnu.org/licenses/.\n/\n\n#version 330 core\nin vec2 graph_pos;\nout vec4 rgba;\n\nuniform vec2 pixel_extent;\nuniform float scale;\nuniform float major_grid;\nuniform float minor_grid;\nuniform float samples;\nuniform float line_thickness;\nuniform vec3 fg_color;\nuniform vec3 bg_color;\n\n#define pi 3.141592653589793\n#define e 2.718281828459045\n\n#define ln(x) log(x)\n#define lg(x) log2(x)\n#define log_base(b, x) (log(x)/log(b))\n#define sec(x) (1.0/cos(x))\n#define csc(x) (1.0/sin(x))\n#define cosec(x) csc(x)\n#define cot(x) (1.0/tan(x))\n#define arcsin(x) asin(x)\n#define arccos(x) acos(x)\n#define arctan(x) atan(x)\n#define asec(x) acos(1.0/(x))\n#define acsc(x) asin(1.0/(x))\n#define acosec(x) acsc(x)\n#define acot(x) (atan(1.0/(x)) - ((x) > 0 ? 0.0 : pi))\n#define arcsec(x) asec(x)\n#define arccsc(x) acsc(x)\n#define arccosec(x) acsc(x)\n#define arccot(x) acot(x)\n#define sech(x) (1.0/cosh(x))\n#define csch(x) (1.0/sinh(x))\n#define cosech(x) csch(x)\n#define coth(x) (1.0/tanh(x))\n#define asech(x) acosh(1.0/(x))\n#define acsch(x) asinh(1.0/(x))\n#define acosech(x) acsch(x)\n#define acoth(x) atanh(1.0/(x))\n#define sgn(x) sign(x)\n#define sinc(x) (sin(x)/(x))\n\nfloat rand(vec2 co){\n    // implementation found at: lumina.sourceforge.net/Tutorials/Noise.html\n    return 2fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453) - 1;\n}\n\nfloat zmod(float x, float y) {\n    // mod(x,y), but centered on zero\n    return mod(x + y/2, y) - y/2;\n}\n\nfloat factorial(float x) {\n    float res = 1;\n    for (float i = 1; i <= x; i++)\n        res = i;\n    return res;\n}\n\nfloat mypow(float x, float y) {\n    if (x >= 0)\n        return pow(x, y);\n    else if (floor(y) == y) {\n        return int(y) % 2 == 0 ? pow(-x, y) : -pow(-x, y);\n    }\n    return 1e999;\n}\n\n\n\n\n\nvoid main() {\n    vec3 color = bg_color;\n    vec3 formula_color = vec3(0);\n    float sample_extent = line_thicknesspixel_extent.x;\n    float step = sample_extent / samples;\n    float jitter = .4;\n\n    \n    {\n        \n    }\n    \n\n    float axis_width = pixel_extent.x;\n    vec3 minor_color = mix(fg_color, bg_color, 0.6);\n    color = mix(minor_color, color, smoothstep(axis_width.4, axis_width*.6, abs(zmod(graph_pos.x, minor_grid))));\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.y, minor_grid))));\n    vec3 major_color = mix(fg_color, bg_color, 0.4);\n    color = mix(major_color, color, smoothstep(axis_width, axis_width1.05, abs(zmod(graph_pos.x, major_grid))));\n    color = mix(major_color, color, smoothstep(axis_width, axis_width1.05, abs(zmod(graph_pos.y, major_grid))));\n    vec3 axis_color = fg_color;\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.x)));\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.y)));\n    rgba = vec4(color, 1);\n}'], GL_FRAGMENT_SHADER)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):

File "/app/lib/python3.9/site-packages/plots/graph.py", line 121, in gl_realize

self.app.update_shader()

File "/app/lib/python3.9/site-packages/plots/plots.py", line 226, in update_shader

attempt(good)

File "/app/lib/python3.9/site-packages/plots/plots.py", line 216, in attempt

self.gl_area.update_fragment_shader(formulae)

File "/app/lib/python3.9/site-packages/plots/graph.py", line 270, in update_fragment_shader

fragment_shader = shaders.compileShader(

File "/app/lib/python3.9/site-packages/OpenGL/GL/shaders.py", line 235, in compileShader

raise ShaderCompilationError(

OpenGL.GL.shaders.ShaderCompilationError: ("Shader compile failure (0): b'0(88) : error C0153: floating point constant overflow\n'", [b'/\n   Copyright 2021 Alexander Huntley\n\n   This file is part of Plots.\n\n   Plots is free software: you can redistribute it and/or modify\n   it under the terms of the GNU General Public License as published by\n   the Free Software Foundation, either version 3 of the License, or\n   (at your option) any later version.\n\n   Plots is distributed in the hope that it will be useful,\n   but WITHOUT ANY WARRANTY; without even the implied warranty of\n   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n   GNU General Public License for more details.\n\n   You should have received a copy of the GNU General Public License\n   along with Plots.  If not, see https://www.gnu.org/licenses/.\n/\n\n#version 330 core\nin vec2 graph_pos;\nout vec4 rgba;\n\nuniform vec2 pixel_extent;\nuniform float scale;\nuniform float major_grid;\nuniform float minor_grid;\nuniform float samples;\nuniform float line_thickness;\nuniform vec3 fg_color;\nuniform vec3 bg_color;\n\n#define pi 3.141592653589793\n#define e 2.718281828459045\n\n#define ln(x) log(x)\n#define lg(x) log2(x)\n#define log_base(b, x) (log(x)/log(b))\n#define sec(x) (1.0/cos(x))\n#define csc(x) (1.0/sin(x))\n#define cosec(x) csc(x)\n#define cot(x) (1.0/tan(x))\n#define arcsin(x) asin(x)\n#define arccos(x) acos(x)\n#define arctan(x) atan(x)\n#define asec(x) acos(1.0/(x))\n#define acsc(x) asin(1.0/(x))\n#define acosec(x) acsc(x)\n#define acot(x) (atan(1.0/(x)) - ((x) > 0 ? 0.0 : pi))\n#define arcsec(x) asec(x)\n#define arccsc(x) acsc(x)\n#define arccosec(x) acsc(x)\n#define arccot(x) acot(x)\n#define sech(x) (1.0/cosh(x))\n#define csch(x) (1.0/sinh(x))\n#define cosech(x) csch(x)\n#define coth(x) (1.0/tanh(x))\n#define asech(x) acosh(1.0/(x))\n#define acsch(x) asinh(1.0/(x))\n#define acosech(x) acsch(x)\n#define acoth(x) atanh(1.0/(x))\n#define sgn(x) sign(x)\n#define sinc(x) (sin(x)/(x))\n\nfloat rand(vec2 co){\n    // implementation found at: lumina.sourceforge.net/Tutorials/Noise.html\n    return 2fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453) - 1;\n}\n\nfloat zmod(float x, float y) {\n    // mod(x,y), but centered on zero\n    return mod(x + y/2, y) - y/2;\n}\n\nfloat factorial(float x) {\n    float res = 1;\n    for (float i = 1; i <= x; i++)\n        res = i;\n    return res;\n}\n\nfloat mypow(float x, float y) {\n    if (x >= 0)\n        return pow(x, y);\n    else if (floor(y) == y) {\n        return int(y) % 2 == 0 ? pow(-x, y) : -pow(-x, y);\n    }\n    return 1e999;\n}\n\n\n\n\n\nvoid main() {\n    vec3 color = bg_color;\n    vec3 formula_color = vec3(0);\n    float sample_extent = line_thicknesspixel_extent.x;\n    float step = sample_extent / samples;\n    float jitter = .4;\n\n    \n    {\n        \n    }\n    \n\n    float axis_width = pixel_extent.x;\n    vec3 minor_color = mix(fg_color, bg_color, 0.6);\n    color = mix(minor_color, color, smoothstep(axis_width.4, axis_width*.6, abs(zmod(graph_pos.x, minor_grid))));\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.y, minor_grid))));\n    vec3 major_color = mix(fg_color, bg_color, 0.4);\n    color = mix(major_color, color, smoothstep(axis_width, axis_width1.05, abs(zmod(graph_pos.x, major_grid))));\n    color = mix(major_color, color, smoothstep(axis_width, axis_width1.05, abs(zmod(graph_pos.y, major_grid))));\n    vec3 axis_color = fg_color;\n    color = mix(axis_color,

add abs(x) function

Maybe I missed it, but it would be great to have a absolute function |x| or abs(x).

Btw a fun program. Thanks!

version 0.8

Error While installing Plots using the AUR

System information :

Operating System: Manjaro Linux
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Kernel Version: 5.10.70-1-MANJARO (64-bit)

Error during installation:

...
==> Starting check()...
running test
WARNING: Testing via this command is deprecated and will be removed in a future version. Users looking for a generic test entry point independent of test runner are encouraged to use tox.
running egg_info
creating Plots.egg-info
writing Plots.egg-info/PKG-INFO
writing dependency_links to Plots.egg-info/dependency_links.txt
writing entry points to Plots.egg-info/entry_points.txt
writing requirements to Plots.egg-info/requires.txt
writing top-level names to Plots.egg-info/top_level.txt
writing manifest file 'Plots.egg-info/SOURCES.txt'
reading manifest file 'Plots.egg-info/SOURCES.txt'
adding license file 'COPYING'
writing manifest file 'Plots.egg-info/SOURCES.txt'
running build_ext
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused

(setup.py:154794): Gtk-WARNING **: 17:29:40.975: cannot open display: 
==> ERROR: A failure occurred in check().
    Aborting...
Finished with result: exit-code
Main processes terminated with: code=exited/status=4
Service runtime: 7.559s
CPU time consumed: 1.901s

However I can install plots with python3, works fine.

#47 Might solve the issue !

Create help page

Should explain to users how to use the app and list all the possible functions.

Warning: OpenGL 3.2.0 is unsupported despite that my GPU should support up to OpenGL 4.6

My desktop is using a GTX 970 with the proprietary driver stack version 515.65.01. This should support OpenGL 4.6 according to glxinfo and I don't have any issues running games and such. Yet despite this, when I launch Plots I'm greeted by a message saying that OpenGL 3.2.0 is unsupported:

What could be causing this? I am using Plots 0.8.1 from Flathub for what it's worth, and other Flatpak apps don't seem to have issues with 3D acceleration (SuperTuxKart and Trigger Rally both work fine). Could it be that it's picking OpenGL ES 3.2 (and thus the 3.2.0 version number) for some reason? I'm reminded of this: https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/4687

Not working ^

Coming from flathub/flathub#2036

I still can't make ^ work properly, the issue is probably related to my locale

bilelmoussaoui@fedora ~ > locale 
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

That's all I get from the terminal

bilelmoussaoui@fedora ~/P/contrast (wip/cdavis/gtk4) [SIGINT]> flatpak run com.github.alexhuntley.Plots
Traceback (most recent call last):
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 264, in on_pointer_move
    self.cursor.mouse_select(element, direction, drag=True)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 341, in mouse_select
    self.selection_bounds, self.selection_ancestor = self.calculate_selection()
TypeError: cannot unpack non-iterable NoneType object
Traceback (most recent call last):
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 147, in do_draw_cb
    self.expr.draw(ctx, self.cursor, widget_transform)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 652, in draw
    super().draw(ctx, cursor, widget_transform)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 551, in draw
    self.index_in_parent in cursor.selection_bounds:
TypeError: argument of type 'NoneType' is not iterable
Traceback (most recent call last):
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 147, in do_draw_cb
    self.expr.draw(ctx, self.cursor, widget_transform)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 652, in draw
    super().draw(ctx, cursor, widget_transform)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 551, in draw
    self.index_in_parent in cursor.selection_bounds:
TypeError: argument of type 'NoneType' is not iterable
Traceback (most recent call last):
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 264, in on_pointer_move
    self.cursor.mouse_select(element, direction, drag=True)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 341, in mouse_select
    self.selection_bounds, self.selection_ancestor = self.calculate_selection()
TypeError: cannot unpack non-iterable NoneType object
Traceback (most recent call last):
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 264, in on_pointer_move
    self.cursor.mouse_select(element, direction, drag=True)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 341, in mouse_select
    self.selection_bounds, self.selection_ancestor = self.calculate_selection()
TypeError: cannot unpack non-iterable NoneType object
Traceback (most recent call last):
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 264, in on_pointer_move
    self.cursor.mouse_select(element, direction, drag=True)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 341, in mouse_select
    self.selection_bounds, self.selection_ancestor = self.calculate_selection()
TypeError: cannot unpack non-iterable NoneType object
Traceback (most recent call last):
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 147, in do_draw_cb
    self.expr.draw(ctx, self.cursor, widget_transform)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 652, in draw
    super().draw(ctx, cursor, widget_transform)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 551, in draw
    self.index_in_parent in cursor.selection_bounds:
TypeError: argument of type 'NoneType' is not iterable
Traceback (most recent call last):
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 147, in do_draw_cb
    self.expr.draw(ctx, self.cursor, widget_transform)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 652, in draw
    super().draw(ctx, cursor, widget_transform)
  File "/app/lib/python3.8/site-packages/plots/formula.py", line 551, in draw
    self.index_in_parent in cursor.selection_bounds:
TypeError: argument of type 'NoneType' is not iterable
Shader compile failure (0): b"0:74(9): error: `s' undeclared\n0:74(2): error: `return' with wrong type error, in function `formula0' returning float\n"
Shader compile failure (0): b"0:74(9): error: `s' undeclared\n0:74(11): error: `i' undeclared\n0:74(9): error: operands to arithmetic operators must be numeric\n0:74(2): error: `return' with wrong type error, in function `formula0' returning float\n"
Shader compile failure (0): b"0:74(9): error: `sin' undeclared\n0:74(2): error: `return' with wrong type error, in function `formula0' returning float\n"

I think it could need some "Help page" with the list of operations you can use and how you can type them :)

Sqrt is not following completely dark mode

The horizontal bar of the square root is displayed black in dark mode.

Crash on startup

Describe the bug

Freshly installed Plots app doesn't open. While running Plots with Termianl: (flatpak run com.github.alexhuntley.Plots) there is the following error:

[martin@fedora ~]$ flatpak run com.github.alexhuntley.Plots

(process:2): Gtk-WARNING **: 17:20:19.820: Locale not supported by C library.
	Using the fallback 'C' locale.
Traceback (most recent call last):
  File "/app/bin/plots", line 8, in <module>
    sys.exit(main())
  File "/app/lib/python3.9/site-packages/plots/__init__.py", line 22, in main
    plots.Plots().run(sys.argv)
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 42, in __init__
    plots.i18n.bind()
  File "/app/lib/python3.9/site-packages/plots/i18n.py", line 26, in bind
    locale.setlocale(locale.LC_ALL, "")
  File "/usr/lib/python3.9/locale.py", line 610, in setlocale
    return _setlocale(category, locale)

Additional information:

Plots 0.8.4 (Flathub)
OS: Fedora Silverblue 37 (Beta)
GNOME 43.0
Wayland

Strange artefacting when doing y = x^(4/3)

Screenshot speaks for itself I think:

This only happens on my laptop which uses Intel graphics (Intel HD 5000). My desktop, which uses NVIDIA graphics with the proprietary driver version 495.46, does not exhibit this issue:

Plots was installed from Flathub on both systems.

Desktop file description/comment

Where is the Desktop file so that the description/comment can be:

added
localised
#20

Thank you

Hungarian translations of Help files on Weblate complete

The recent release of Plots on Flathub didn't include the partially complete Help file translations.

Does the CI need to be updated so that updates to the Help files are included with new releases of the main Plots program?
Can the Hungarian Help file translations please be merged into the Plots program and released on Flathub?

Thank you

the delete button does not look right

This is the flathub version 0.6.1

plots are under helpers

Drawed plots are under helper lines:

Localization of some formulas

I am an Italian mathematician so I use correct formulas. Anyway, some scholars could use "sen" instead of "sin" (sinus), "tg" instead of "tan", "cotg" or "cotan" instead of "cot"

Axis scale and increment

Currently the x-axis and y-axis are linear and based on unity.

Is it possible to change the x-axis, y-axis or both axes to logarithmic?
Is it possible to change the increment from unity (i.e. 1, 2, 3, …) to π (i.e. π, 2π, 3π, …)? If you zoom in, the units could still be based on fractional measurements of π, i.e. -0.6π, -0.4π, -0.2π, 0, 0.2π, 0.4π, 0.6π.

What do you think?

Thank you

Reduce the color contrast between the grid and the axes

Hi!

Can you please consider reducing the contrast between the color of the grid and that of the main axes?

As you see, it's pretty difficult to distinguish them. Also, the grid is so prominent that it makes difficult to see some functions or parts of them. In fact, have you noticed that in the above picture I plotted f(x) = 2? 👀

Crash when pasting syntactically incorrect equations

For instance pasting crash¡ into an equation field leads to a crash with the following traceback:

Traceback (most recent call last):
  File "/app/lib/python3.9/site-packages/plots/cursor.py", line 98, in paste_cb
    elements = parser.from_latex(text)
  File "/app/lib/python3.9/site-packages/plots/parser.py", line 138, in from_latex
    return transformer.transform(latex_parser.parse(string))
  File "/app/lib/python3.9/site-packages/lark/lark.py", line 625, in parse
    return self.parser.parse(text, start=start, on_error=on_error)
  File "/app/lib/python3.9/site-packages/lark/parser_frontends.py", line 96, in parse
    return self.parser.parse(stream, chosen_start, **kw)
  File "/app/lib/python3.9/site-packages/lark/parsers/earley.py", line 266, in parse
    to_scan = self._parse(lexer, columns, to_scan, start_symbol)
  File "/app/lib/python3.9/site-packages/lark/parsers/xearley.py", line 146, in _parse
    to_scan = scan(i, to_scan)
  File "/app/lib/python3.9/site-packages/lark/parsers/xearley.py", line 119, in scan
    raise UnexpectedCharacters(stream, i, text_line, text_column, {item.expect.name for item in to_scan},
lark.exceptions.UnexpectedCharacters: No terminal matches '¡' in the current parser context, at line 1 col 6

crash¡
     ^
Expected one of: 
	* MINUS
	* __ANON_4
	* PAREN
	* EQUAL
	* UNDERSCORE
	* DIGIT
	* __ANON_3
	* __ANON_0
	* __ANON_1
	* __ANON_5
	* GREEK
	* __ANON_7
	* __ANON_2
	* CIRCUMFLEX
	* PLUS
	* SYMBOL
	* TIMES
	* __ANON_6
	* LETTER

Version:
0.8.2 (flatpak)

[Feature Request] Add Support for integral and derivative functions

First of all, thank you for this wonderful app, I first tried it recently and I really like the clean user interface and simple, command driven usage.

I would find it really helpful if the program would be able to plot integral and derivatives.
This would not only be helpful to demonstrate basics of calculus but would also enable the plotting of some functions in their most common form. E.g. the gamma function is only rarely advertised in its product form and hence, really hard to plot for anybody unaware of other formulations.

Clarification about dependencies

Right now, plot fails to build in Arch Linux and Ubuntu with the following error.

ModuleNotFoundError: No module named 'glm'

Is it this library? https://pypi.org/project/glm/
Is it something else?

Translations

Some keys are translateable. How can I translate this software?

`New window` in menu of main program, and other ideas

In the Help menu, the first item is New window. Can this feature please be added to the main program?

Thank you

In-tree flatpak manifest

It's useful for a clone, build, run with GNOME Builder or VSCode (or any IDE that does support Flatpak in the future) :)

It can also be used for CI

Suggestion: RPM package

Could you make an RPM package? Flatpak never worked for me, and I'm on Fedora.

Show axis coordinates

It's hard to get a good idea of the scale of the graphs without having at least some x and y values as a foundation. It'd be great if the x and y axis were both labeled with coordinates at regular intervals. Those intervals should depend on the scale of zoom, so that they're easily legible, but not sparse enough to be unhelpful.

Make strings translatable

Please add the summary and description texts (see below) into one of the Weblate components so they can get translated into other languages.

Summary:
Simple graph plotting

Description 1:
Plots makes it easy to visualise mathematical formulae. In addition to basic arithmetic operations, it supports trigonometric, hyperbolic, exponential and logarithmic functions, as well as arbitrary sums and products.

Description 2:
Plots is designed to integrate well with the GNOME desktop and takes advantage of modern hardware using OpenGL.

Also make sure those translated strings get used on localized web-pages like this one:
https://world.pages.gitlab.gnome.org/apps-for-gnome/hr/app/com.github.alexhuntley.Plots/

Animate variables

Add the ability to animate variables, similar to how desmos does it.

Why:
It would help the user gain a better understanding of how a change in a variable affects a graph.

Follow on features:
add the ability to export a video/gif of the animation.

Crash when typing "^" in an empty equation

The application crashes when typing "^" into an empty equation

Traceback:

Traceback (most recent call last):
  File "/app/lib/python3.9/site-packages/plots/formularow.py", line 304, in edited
    body, expr = self.editor.expr.to_glsl()
  File "/app/lib/python3.9/site-packages/plots/elements/elements.py", line 307, in to_glsl
    string_stack[-1].insert(i, "mypow(")
UnboundLocalError: local variable 'i' referenced before assignment

Version:
0.8.2 (flatpak)

Help broken on Flatpak

I open the menu and click on Help, a new window open displaying the following message:

Document Not Found
The URI ‘help:plots/index’ does not point to a valid page.
Search for packages containing this document.

In About no link to Github

In About section there is no link to Github

y = log_a(x) not supported

I cannot show the graph of y = log_a (x) either with any a or moving a in an interval

Circle formula?

It seems
x^2+y^2=4
doesn't work properly. Any support?

x = number plots y = number

As title says

How to enter the n-th root

If I open the German help I see the following:

Probably it was not a good idea to translate that (like this)… maybe I can help

Using values from external files in formulas

Hi, thanks for your work on Plots, it is really useful!

My use-case is mostly applying formulas to arbitrary values (simulation output) to further process the signal.
I would like to be able to "import" values from external files.
For example CSV files formatted with x, y per lines would be available as f(x) = y, to be able to plot it.
I wouldn't mind and could contribute an inelegant hack of importing a hardcoded filename on startup, I would just need an idea of where to look for, specifically where in the parser or in the formula calculation, to feed the imported values.

I guess this might not be a very common use-case?

make all colors dark/light mode aware

currently only black (white) is only dark/light mode aware.

It would be great to have all colors be mode aware.

Proposal:
Define for the light mode a set of dark colors (maybe remove yellow, at it is not really visible) on white background.
Then define for each color a lighter version for the dark mode (maybe it is not needed for medium bright colors)

With this, one could switch between the different modes, without adjusting the colors of the plots.

Crash on typing "sum"

When I type "sum" into an equation, the application crashes with the following error:

Traceback (most recent call last):
  File "/app/lib/python3.9/site-packages/plots/formularow.py", line 304, in edited
    body, expr = self.editor.expr.to_glsl()
  File "/app/lib/python3.9/site-packages/plots/elements/elements.py", line 338, in to_glsl
    sum_body, sum_expr = sums.pop().to_glsl("".join(body_stack.pop()),
  File "/app/lib/python3.9/site-packages/plots/elements/sum.py", line 53, in to_glsl
    assert var.isidentifier()

Running the latest flatpak version (0.8.1).

Sometimes it's not possible to close about dialog

Sometimes/Often it's not possible to close the about dialog any more and then application can only be killed.

Try a couple of times to open the about dialog an close it.

v0,8 via Flatpak

Crash when removing definition of used varaible

Deleting a variable that is used in in another equation crashes the program.

How to reproduce:

Write a=1 as first equation
Write a*x as second equation
delete the first equation

Traceback:

Traceback (most recent call last):
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 222, in update_shader
    attempt(good + bad + unknown)
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 217, in attempt
    self.gl_area.update_fragment_shader(formulae)
  File "/app/lib/python3.9/site-packages/plots/graph.py", line 275, in update_fragment_shader
    fragment_shader = shaders.compileShader(
  File "/app/lib/python3.9/site-packages/OpenGL/GL/shaders.py", line 235, in compileShader
    raise ShaderCompilationError(
OpenGL.GL.shaders.ShaderCompilationError: ('Shader compile failure (0): b"0:94(9): error: `a\' undeclared\\n0:94(9): error: operands to arithmetic operators must be numeric\\n0:94(2): error: `return\' with wrong type error, in function `formula139965471340384\' returning float\\n"', [b'/*\n   Copyright 2021 Alexander Huntley\n\n   This file is part of Plots.\n\n   Plots is free software: you can redistribute it and/or modify\n   it under the terms of the GNU General Public License as published by\n   the Free Software Foundation, either version 3 of the License, or\n   (at your option) any later version.\n\n   Plots is distributed in the hope that it will be useful,\n   but WITHOUT ANY WARRANTY; without even the implied warranty of\n   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n   GNU General Public License for more details.\n\n   You should have received a copy of the GNU General Public License\n   along with Plots.  If not, see <https://www.gnu.org/licenses/>.\n*/\n\n#version 330 core\nin vec2 graph_pos;\nout vec4 rgba;\n\nuniform vec2 pixel_extent;\nuniform float scale;\nuniform float major_grid;\nuniform float minor_grid;\nuniform float samples;\nuniform float line_thickness;\nuniform vec3 fg_color;\nuniform vec3 bg_color;\n\n#define pi 3.141592653589793\n#define e 2.718281828459045\n\n#define ln(x) log(x)\n#define lg(x) log2(x)\n#define log_base(b, x) (log(x)/log(b))\n#define sec(x) (1.0/cos(x))\n#define csc(x) (1.0/sin(x))\n#define cosec(x) csc(x)\n#define cot(x) (1.0/tan(x))\n#define arcsin(x) asin(x)\n#define arccos(x) acos(x)\n#define arctan(x) atan(x)\n#define asec(x) acos(1.0/(x))\n#define acsc(x) asin(1.0/(x))\n#define acosec(x) acsc(x)\n#define acot(x) (atan(1.0/(x)) - ((x) > 0 ? 0.0 : pi))\n#define arcsec(x) asec(x)\n#define arccsc(x) acsc(x)\n#define arccosec(x) acsc(x)\n#define arccot(x) acot(x)\n#define sech(x) (1.0/cosh(x))\n#define csch(x) (1.0/sinh(x))\n#define cosech(x) csch(x)\n#define coth(x) (1.0/tanh(x))\n#define asech(x) acosh(1.0/(x))\n#define acsch(x) asinh(1.0/(x))\n#define acosech(x) acsch(x)\n#define acoth(x) atanh(1.0/(x))\n#define sgn(x) sign(x)\n#define sinc(x) (sin(x)/(x))\n\nfloat rand(vec2 co){\n    // implementation found at: lumina.sourceforge.net/Tutorials/Noise.html\n    return 2*fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453) - 1;\n}\n\nfloat zmod(float x, float y) {\n    // mod(x,y), but centered on zero\n    return mod(x + y/2, y) - y/2;\n}\n\nfloat factorial(float x) {\n    float res = 1;\n    for (float i = 1; i <= x; i++)\n        res *= i;\n    return res;\n}\n\nfloat mypow(float x, float y) {\n    if (x >= 0)\n        return pow(x, y);\n    else if (floor(y) == y) {\n        return int(y) % 2 == 0 ? pow(-x, y) : -pow(-x, y);\n    }\n    return 1. / 0.;\n}\n\n\nfloat formula139965471340384(float x) {\n    \n    return a*x;\n}\n\n\n\n\nvoid main() {\n    vec3 color = bg_color;\n    vec3 formula_color = vec3(0);\n    float sample_extent = line_thickness*pixel_extent.x;\n    float step = sample_extent / samples;\n    float jitter = .4;\n\n    float axis_width = pixel_extent.x;\n    vec3 minor_color = mix(fg_color, bg_color, 0.6);\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.x, minor_grid))));\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.y, minor_grid))));\n    vec3 major_color = mix(fg_color, bg_color, 0.4);\n    color = mix(major_color, color, smoothstep(axis_width, axis_width*1.05, abs(zmod(graph_pos.x, major_grid))));\n    color = mix(major_color, color, smoothstep(axis_width, axis_width*1.05, abs(zmod(graph_pos.y, major_grid))));\n    vec3 axis_color = fg_color;\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.x)));\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.y)));\n\n    \n    {\n        float inside = 0;\nfloat outside = 0;\nfloat prev = 0;\nint monotonic = 0;\nbool nans = false;\nfor (float i = 0.0; i < samples; i++) {\n    float ii = i + jitter*rand(vec2(graph_pos.x + i*step, graph_pos.y)) - samples/2;\n    float x = graph_pos.x + ii*step;\n    float yj = jitter*rand(vec2(graph_pos.y, graph_pos.y + i*step));\n    float lower = (-0.5+yj)*sample_extent;\n    float upper = (0.5+yj)*sample_extent;\n    float fp, f;\n\n    f = formula139965471340384(x) - graph_pos.y;\n    if (lower < f && f < upper)\n        inside += 1.0;\n    else\n        outside += sign(f);\n    fp = prev;\n    if (i != 0.0)\n        monotonic += int(sign(f - fp));\n    prev = f;\n    nans = nans || isinf(f) || isnan(f);\n}\nformula_color = vec3(0.5607843399047852,0.9411764740943909,0.6431372761726379);\nif (abs(monotonic) != int(samples) - 3 && !nans) {\n    if (inside > 0.0)\n        color = mix(color, formula_color, inside/samples);\n    if (abs(outside) != samples)\n        color = mix(color, formula_color, 1. - abs(outside)/samples);\n}\n    }\n    \n    {\n        \n    }\n    \n\n    rgba = vec4(color, 1);\n}'], GL_FRAGMENT_SHADER)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 225, in update_shader
    attempt(good + unknown)
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 217, in attempt
    self.gl_area.update_fragment_shader(formulae)
  File "/app/lib/python3.9/site-packages/plots/graph.py", line 275, in update_fragment_shader
    fragment_shader = shaders.compileShader(
  File "/app/lib/python3.9/site-packages/OpenGL/GL/shaders.py", line 235, in compileShader
    raise ShaderCompilationError(
OpenGL.GL.shaders.ShaderCompilationError: ('Shader compile failure (0): b"0:94(9): error: `a\' undeclared\\n0:94(9): error: operands to arithmetic operators must be numeric\\n0:94(2): error: `return\' with wrong type error, in function `formula139965471340384\' returning float\\n"', [b'/*\n   Copyright 2021 Alexander Huntley\n\n   This file is part of Plots.\n\n   Plots is free software: you can redistribute it and/or modify\n   it under the terms of the GNU General Public License as published by\n   the Free Software Foundation, either version 3 of the License, or\n   (at your option) any later version.\n\n   Plots is distributed in the hope that it will be useful,\n   but WITHOUT ANY WARRANTY; without even the implied warranty of\n   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n   GNU General Public License for more details.\n\n   You should have received a copy of the GNU General Public License\n   along with Plots.  If not, see <https://www.gnu.org/licenses/>.\n*/\n\n#version 330 core\nin vec2 graph_pos;\nout vec4 rgba;\n\nuniform vec2 pixel_extent;\nuniform float scale;\nuniform float major_grid;\nuniform float minor_grid;\nuniform float samples;\nuniform float line_thickness;\nuniform vec3 fg_color;\nuniform vec3 bg_color;\n\n#define pi 3.141592653589793\n#define e 2.718281828459045\n\n#define ln(x) log(x)\n#define lg(x) log2(x)\n#define log_base(b, x) (log(x)/log(b))\n#define sec(x) (1.0/cos(x))\n#define csc(x) (1.0/sin(x))\n#define cosec(x) csc(x)\n#define cot(x) (1.0/tan(x))\n#define arcsin(x) asin(x)\n#define arccos(x) acos(x)\n#define arctan(x) atan(x)\n#define asec(x) acos(1.0/(x))\n#define acsc(x) asin(1.0/(x))\n#define acosec(x) acsc(x)\n#define acot(x) (atan(1.0/(x)) - ((x) > 0 ? 0.0 : pi))\n#define arcsec(x) asec(x)\n#define arccsc(x) acsc(x)\n#define arccosec(x) acsc(x)\n#define arccot(x) acot(x)\n#define sech(x) (1.0/cosh(x))\n#define csch(x) (1.0/sinh(x))\n#define cosech(x) csch(x)\n#define coth(x) (1.0/tanh(x))\n#define asech(x) acosh(1.0/(x))\n#define acsch(x) asinh(1.0/(x))\n#define acosech(x) acsch(x)\n#define acoth(x) atanh(1.0/(x))\n#define sgn(x) sign(x)\n#define sinc(x) (sin(x)/(x))\n\nfloat rand(vec2 co){\n    // implementation found at: lumina.sourceforge.net/Tutorials/Noise.html\n    return 2*fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453) - 1;\n}\n\nfloat zmod(float x, float y) {\n    // mod(x,y), but centered on zero\n    return mod(x + y/2, y) - y/2;\n}\n\nfloat factorial(float x) {\n    float res = 1;\n    for (float i = 1; i <= x; i++)\n        res *= i;\n    return res;\n}\n\nfloat mypow(float x, float y) {\n    if (x >= 0)\n        return pow(x, y);\n    else if (floor(y) == y) {\n        return int(y) % 2 == 0 ? pow(-x, y) : -pow(-x, y);\n    }\n    return 1. / 0.;\n}\n\n\nfloat formula139965471340384(float x) {\n    \n    return a*x;\n}\n\n\n\n\nvoid main() {\n    vec3 color = bg_color;\n    vec3 formula_color = vec3(0);\n    float sample_extent = line_thickness*pixel_extent.x;\n    float step = sample_extent / samples;\n    float jitter = .4;\n\n    float axis_width = pixel_extent.x;\n    vec3 minor_color = mix(fg_color, bg_color, 0.6);\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.x, minor_grid))));\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.y, minor_grid))));\n    vec3 major_color = mix(fg_color, bg_color, 0.4);\n    color = mix(major_color, color, smoothstep(axis_width, axis_width*1.05, abs(zmod(graph_pos.x, major_grid))));\n    color = mix(major_color, color, smoothstep(axis_width, axis_width*1.05, abs(zmod(graph_pos.y, major_grid))));\n    vec3 axis_color = fg_color;\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.x)));\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.y)));\n\n    \n    {\n        float inside = 0;\nfloat outside = 0;\nfloat prev = 0;\nint monotonic = 0;\nbool nans = false;\nfor (float i = 0.0; i < samples; i++) {\n    float ii = i + jitter*rand(vec2(graph_pos.x + i*step, graph_pos.y)) - samples/2;\n    float x = graph_pos.x + ii*step;\n    float yj = jitter*rand(vec2(graph_pos.y, graph_pos.y + i*step));\n    float lower = (-0.5+yj)*sample_extent;\n    float upper = (0.5+yj)*sample_extent;\n    float fp, f;\n\n    f = formula139965471340384(x) - graph_pos.y;\n    if (lower < f && f < upper)\n        inside += 1.0;\n    else\n        outside += sign(f);\n    fp = prev;\n    if (i != 0.0)\n        monotonic += int(sign(f - fp));\n    prev = f;\n    nans = nans || isinf(f) || isnan(f);\n}\nformula_color = vec3(0.5607843399047852,0.9411764740943909,0.6431372761726379);\nif (abs(monotonic) != int(samples) - 3 && !nans) {\n    if (inside > 0.0)\n        color = mix(color, formula_color, inside/samples);\n    if (abs(outside) != samples)\n        color = mix(color, formula_color, 1. - abs(outside)/samples);\n}\n    }\n    \n    {\n        \n    }\n    \n\n    rgba = vec4(color, 1);\n}'], GL_FRAGMENT_SHADER)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/app/lib/python3.9/site-packages/plots/formularow.py", line 283, in delete
    self.app.update_shader()
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 227, in update_shader
    attempt(good)
  File "/app/lib/python3.9/site-packages/plots/plots.py", line 217, in attempt
    self.gl_area.update_fragment_shader(formulae)
  File "/app/lib/python3.9/site-packages/plots/graph.py", line 275, in update_fragment_shader
    fragment_shader = shaders.compileShader(
  File "/app/lib/python3.9/site-packages/OpenGL/GL/shaders.py", line 235, in compileShader
    raise ShaderCompilationError(
OpenGL.GL.shaders.ShaderCompilationError: ('Shader compile failure (0): b"0:94(9): error: `a\' undeclared\\n0:94(9): error: operands to arithmetic operators must be numeric\\n0:94(2): error: `return\' with wrong type error, in function `formula139965471340384\' returning float\\n"', [b'/*\n   Copyright 2021 Alexander Huntley\n\n   This file is part of Plots.\n\n   Plots is free software: you can redistribute it and/or modify\n   it under the terms of the GNU General Public License as published by\n   the Free Software Foundation, either version 3 of the License, or\n   (at your option) any later version.\n\n   Plots is distributed in the hope that it will be useful,\n   but WITHOUT ANY WARRANTY; without even the implied warranty of\n   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n   GNU General Public License for more details.\n\n   You should have received a copy of the GNU General Public License\n   along with Plots.  If not, see <https://www.gnu.org/licenses/>.\n*/\n\n#version 330 core\nin vec2 graph_pos;\nout vec4 rgba;\n\nuniform vec2 pixel_extent;\nuniform float scale;\nuniform float major_grid;\nuniform float minor_grid;\nuniform float samples;\nuniform float line_thickness;\nuniform vec3 fg_color;\nuniform vec3 bg_color;\n\n#define pi 3.141592653589793\n#define e 2.718281828459045\n\n#define ln(x) log(x)\n#define lg(x) log2(x)\n#define log_base(b, x) (log(x)/log(b))\n#define sec(x) (1.0/cos(x))\n#define csc(x) (1.0/sin(x))\n#define cosec(x) csc(x)\n#define cot(x) (1.0/tan(x))\n#define arcsin(x) asin(x)\n#define arccos(x) acos(x)\n#define arctan(x) atan(x)\n#define asec(x) acos(1.0/(x))\n#define acsc(x) asin(1.0/(x))\n#define acosec(x) acsc(x)\n#define acot(x) (atan(1.0/(x)) - ((x) > 0 ? 0.0 : pi))\n#define arcsec(x) asec(x)\n#define arccsc(x) acsc(x)\n#define arccosec(x) acsc(x)\n#define arccot(x) acot(x)\n#define sech(x) (1.0/cosh(x))\n#define csch(x) (1.0/sinh(x))\n#define cosech(x) csch(x)\n#define coth(x) (1.0/tanh(x))\n#define asech(x) acosh(1.0/(x))\n#define acsch(x) asinh(1.0/(x))\n#define acosech(x) acsch(x)\n#define acoth(x) atanh(1.0/(x))\n#define sgn(x) sign(x)\n#define sinc(x) (sin(x)/(x))\n\nfloat rand(vec2 co){\n    // implementation found at: lumina.sourceforge.net/Tutorials/Noise.html\n    return 2*fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453) - 1;\n}\n\nfloat zmod(float x, float y) {\n    // mod(x,y), but centered on zero\n    return mod(x + y/2, y) - y/2;\n}\n\nfloat factorial(float x) {\n    float res = 1;\n    for (float i = 1; i <= x; i++)\n        res *= i;\n    return res;\n}\n\nfloat mypow(float x, float y) {\n    if (x >= 0)\n        return pow(x, y);\n    else if (floor(y) == y) {\n        return int(y) % 2 == 0 ? pow(-x, y) : -pow(-x, y);\n    }\n    return 1. / 0.;\n}\n\n\nfloat formula139965471340384(float x) {\n    \n    return a*x;\n}\n\n\n\n\nvoid main() {\n    vec3 color = bg_color;\n    vec3 formula_color = vec3(0);\n    float sample_extent = line_thickness*pixel_extent.x;\n    float step = sample_extent / samples;\n    float jitter = .4;\n\n    float axis_width = pixel_extent.x;\n    vec3 minor_color = mix(fg_color, bg_color, 0.6);\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.x, minor_grid))));\n    color = mix(minor_color, color, smoothstep(axis_width*.4, axis_width*.6, abs(zmod(graph_pos.y, minor_grid))));\n    vec3 major_color = mix(fg_color, bg_color, 0.4);\n    color = mix(major_color, color, smoothstep(axis_width, axis_width*1.05, abs(zmod(graph_pos.x, major_grid))));\n    color = mix(major_color, color, smoothstep(axis_width, axis_width*1.05, abs(zmod(graph_pos.y, major_grid))));\n    vec3 axis_color = fg_color;\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.x)));\n    color = mix(axis_color, color, smoothstep(axis_width*.6, axis_width*.65, abs(graph_pos.y)));\n\n    \n    {\n        float inside = 0;\nfloat outside = 0;\nfloat prev = 0;\nint monotonic = 0;\nbool nans = false;\nfor (float i = 0.0; i < samples; i++) {\n    float ii = i + jitter*rand(vec2(graph_pos.x + i*step, graph_pos.y)) - samples/2;\n    float x = graph_pos.x + ii*step;\n    float yj = jitter*rand(vec2(graph_pos.y, graph_pos.y + i*step));\n    float lower = (-0.5+yj)*sample_extent;\n    float upper = (0.5+yj)*sample_extent;\n    float fp, f;\n\n    f = formula139965471340384(x) - graph_pos.y;\n    if (lower < f && f < upper)\n        inside += 1.0;\n    else\n        outside += sign(f);\n    fp = prev;\n    if (i != 0.0)\n        monotonic += int(sign(f - fp));\n    prev = f;\n    nans = nans || isinf(f) || isnan(f);\n}\nformula_color = vec3(0.5607843399047852,0.9411764740943909,0.6431372761726379);\nif (abs(monotonic) != int(samples) - 3 && !nans) {\n    if (inside > 0.0)\n        color = mix(color, formula_color, inside/samples);\n    if (abs(outside) != samples)\n        color = mix(color, formula_color, 1. - abs(outside)/samples);\n}\n    }\n    \n    {\n        \n    }\n    \n\n    rgba = vec4(color, 1);\n}'], GL_FRAGMENT_SHADER)

Version:
0.8.3 (flatpak)

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