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vpype HPGL support

This is a design note related to the implementation of HPGL output support for vpype's write command. This WIP is tracked in this pull request.

The write command implements two related but distinct tasks:

1. Page layout: includes the required scaling, translating and rotating to layout the geometries on a page of specified size and orientation in a predictable way.
2. Output: generate actual SVG/HPGL output from the resulting geometries

The rest of this document describes the intended UI and behaviour once HPGL integration is completed.

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import time

from pyaxidraw import axidraw
from gpiozero import LED

trigger = LED(26)
ad = axidraw.AxiDraw()


def take_photo():

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import time

from pyaxidraw import axidraw
from gpiozero import LED

CM_TO_INCH = 1.0 / 2.54

trigger = LED(26)
ad = axidraw.AxiDraw()
ad.plot_setup()

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# Notes from https://webmanual.rolanddg.com/contents/manuals/DPX-3700A+2700A_USE_E_R8.pdf
# * we use the default "DPX" origin system
# * paper_size: set to value from the X/Y columns (p.17)
# * for A3+ (where Xmm is paper long edge in mm and Ymm is paper short edge in mm):
#   - x_range = (-Xmm * 20 - 480, Xmm * 20 - 480)
#   - y_range = (-Ymm * 20, Ymm * 20
# * for A4:
#   - x_range = (-Xmm * 20, Xmm * 20)
#   - y_range = (-Ymm * 20 - 480, Ymm * 20 - 480)
# * origin_location: set to (-LLx, URy) from table on p. 17

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"""
Port to ModernGL of: https://github.com/rougier/python-opengl/blob/master/code/chapter-09/geom-path.py
Background: https://github.com/rougier/python-opengl/blob/master/09-lines.rst
"""


import glm
import moderngl
import numpy as np
from PIL import Image

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import functools
from typing import Type, Union, Sequence, Any, List, Dict

import moderngl as mgl
import numpy as np


class Uniform:
    def __init__(self, shape: Union[int, Sequence[int]] = 1,
                 dtype: Union[np.dtype, Type, str] = "f4"):

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Here is a summary of how things are/will be soon, unless some kind of UX simplification happens:

Property substitution: uses the str.format() convention. Everywhere something like {propname} shows up, it's replaced with the corresponding property's value (from the current layer if any, or global otherwise). Supports things like {propname:.5f} and the rest of the str.format() mini-language.

Examples:

$ vpype read input.svg [...] write {vp_filename}_processed.svg
$ vpype [...] text "pen width: {vp_pen_width:.2f}" [...]

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from pathlib import Path

from git import Repo

import rerun as rr

GIT_REPO = Path("/tmp") / "rerun"


if not GIT_REPO.exists():