Inkscape extensions for figure resizing and editing

Overview

Academic-Inkscape: Extensions for figure resizing and editing

This repository contains several Inkscape extensions designed for editing plots.

  1. Scale Plots: Changes the size or aspect ratio of a plot without modifying its text and ticks. Especially useful for assembling multi-panel figures.
  2. Flatten Plots: A utility that eliminates much of the structure generated by common vector graphics plotting programs. Makes editing much easier.
  3. The Homogenizer: Quickly sets uniform fonts, font sizes, and stroke widths in a selection.
  4. The Auto-Exporter: A program that will automatically export your SVG files to various formats and keep them updated.

All were written by David Burghoff at the University of Notre Dame. If you find it useful, tell your collegaues!

Installation

You must have the latest release version of Inkscape (1.0.2), and the extensions should be installed using the instructions provided here. Download all of these files, then copy them into the directory listed at Edit > Preferences > System: User extensions. After a restart of Inkscape, the group extensions will be available under Extensions > Academic.

Scale Plots

When dealing with vector graphics generated by plotting environments like Matlab and Matplotlib, resizing plots after the plot has been generated can be difficult. Generally, one wants to resize the lines and data of a plot while leaving text, ticks, and stroke widths unaffected. This is best done in the original program, but precludes quick modification.

For most plots, Scale Plots generates acceptable scalings with little effort. Lines and data are scaled while text and ticks are merely repositioned. The extension attempts to maintain the distance between axes and labels/tick labels by assigning a plot area—a bounding box that is calculated from the largest horizontal and vertical lines. Anything outside is assumed to be a label. (If your plot's axes do not have lines, temporarily add a box to define a plot area.)

Scale Plots example

To use:

  1. Run Flatten Plots on your plot to remove structure generated by the PDF/EPS/SVG exporting process.
  2. Place any objects that you wish to remain unscaled in a group.
  3. Select the elements of your plot and run Scale Plots.

Scale Plots has two modes. In Scaling Mode, the plot is scaled by a constant factor. In Matching Mode, the plot area is made to match the size of the first object you select. This can be convenient when assembling subfigures, as it allows you to match the size of one plot to another plot or to a template rectangle.

Advanced options

  1. If "Auto tick correct" is enabled, the extension assumes that any small horizontal or vertical lines near the edges of the plot area are ticks, and automatically leaves them unscaled.
  2. If a layer name is put into the "Scale-free layer" option, any elements on that layer will remain unscaled. This is basically the same thing as putting an object in a group, but can be easier if there are many such objects (e.g, if your plot has markers).

Flatten Plots

Flatten Plots is a useful utility that eliminates many of the difficulties that arise when plots are exported from common plotting programs.

  1. Deep ungroup: The Scale Plots utility uses grouping to determine when objects are to be kept together, so a deep ungroup is typically needed to remove any existing groupings initially. It also unlinks any clones.
  2. Apply text fixes: Applies a series of fixes to text described below (particularly useful for PDF/EPS text).
  3. Remove white rectangles: Removes any rectangles that have white fill and no stroke. Mostly for removing a plot's background.

Text fixes

  1. Split distant text: Depending on the renderer, it is often the case that the PDF/EPS printing process generates text implemented as a single text object. For example, all of the x-axis ticks might be one object, all of the y-axis ticks might be another, and the title and labels may be another. Internally, each letter is positioned independently. This looks fine, but causes issues when trying to scale or do anything nontrivial.

    drawing

  2. Repair shattered text: Similarly, text in PDFs is often 'shattered'—its letters are positioned individually, so if you try to edit it you will get strange results. This option reverses that, although the tradeoff is that text may be slightly repositioned.

    drawing

  3. Replace missing fonts: Useful for imported documents whose original fonts are not installed on the current machine.

The Homogenizer

The Homogenizer is a utility that does what its name implies: it will set all of the fonts, font sizes, and stroke widths in a selection to the same value. This is most useful when assembling sub-figures, as it allows you to ensure that the whole figure has a uniform look.

Auto-Exporter

The Auto-Exporter is not technically an extension, it is a Python script meant to be run in the background as a daemon. If you frequently export your figures to other formats, you know that updating them whenever you change your figure is a nuisance. This program does it automatically: you specify a directory that the program monitors, and whenever any SVGs are changed, it automatically converts them to the formats you specify. Just select (a) the location where the Inkscape binary is installed, (b) what directory you would like it to watch, and (c) where you would like it to put the exports.

It is currently implemented as a Python script and requires at least Python 3.7. If someone would like to package it into a nice GUI and create executables, let me know.

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Comments
  • Working with multiple subfigures in a single layer

    Working with multiple subfigures in a single layer

    Hi there! Thanks for making an amazing extension - I've just discovered it, but I'm sure it'll become a dear companion!

    For my current workflow, I prepare all figures for a paper in the same file, but on separate layers. This means that figures containing multiple subfigures have a few groups within them. Currently, it seems that the flattener flattens to the top group, even if I select only select a single subgroup (i.e. all the subfigures become a single group). Is there a way (or could there be) of only doing the deep ungrouping from the chosen group and down?

    Thanks!

    opened by roaldarbol 7
  • Points not adjusting size

    Points not adjusting size

    Hi again, sorry to pile on. Please address these at your own pace. :-)

    It seems that the Scaling doesn't work well with markers such as points. Here's a simple raw example: Screenshot 2022-12-15 at 11 32 16

    And here's the scaled version of it, tried both with Scaling mode and Correction mode: Screenshot 2022-12-15 at 11 34 21

    There also seems to be something funky happening with the header, but I think that's simply because it's not rendered well in the original (I can create a separate issue if you'd like me to dig into it a bit).

    opened by roaldarbol 3
  • Flatten Plots does not fully support differential kerning

    Flatten Plots does not fully support differential kerning

    Text that has a dx component will not always be properly de-kerned. This is not a problem for anything imported by Inkscape, but SVG files generated by other programs may cause issues.

    x_and_dx.zip

    opened by burghoff 0
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