force_layout

A pure-R implementation of the Fruchterman-Reingold force-directed layout,
so <code>geom_sketch_node()</code> / <code>geom_sketch_edge()</code> can place a network with no
external graph dependency. Repulsive forces push every node apart; attractive
forces pull edge-connected nodes together; a cooling schedule settles the
system. Coordinates are returned rescaled to roughly <code>[-1, 1]</code> on both axes.

Provides 'ggplot2' geoms that render with a hand-drawn, sketchy
aesthetic: roughened strokes, double-pass lines, and hachure, cross-hatch,
zigzag, and dots fill patterns. Implemented as pure-R 'grid' grobs wrapped
in 'ggproto' geoms, composable with aes(), stats, scales, and faceting.
Works on every R graphics device (PDF, PNG, SVG, screen) with no browser
dependency. Algorithms are reimplemented from the published 'rough.js'
algorithm description (Shihn, 2020,
<https://shihn.ca/posts/2020/roughjs-algorithms/>) and Wood and others
(2012, <doi:10.1109/TVCG.2012.262>); see the NOTICE file in the package
sources for attribution.

Arijit Ghosh

ggsketch

Grammar-Native Hand-Drawn Geoms for 'ggplot2'

force_layout function

<dl><dt>edges</dt>
<dd>A two-column matrix or data frame of 1-based integer node
indices, one row per edge (<code>from</code>, <code>to</code>). May have zero rows (an
edgeless graph, laid out on a circle).</dd>
<dt>n_nodes</dt>
<dd>Number of nodes. Defaults to the largest index in <code>edges</code>
(so isolated high-index nodes need this set explicitly).</dd>
<dt>niter</dt>
<dd>Number of iterations. Default 500.</dd>
<dt>seed</dt>
<dd>Integer seed for the initial placement. <code>NULL</code> uses
<code>getOption("ggsketch.seed", 1L)</code>. The layout is otherwise deterministic.</dd></dl>

Arguments

Force-directed graph layout (Fruchterman-Reingold) — force_layout

<dl>

<dt>edges</dt>
<dd>A two-column matrix or data frame of 1-based integer node
indices, one row per edge (<code>from</code>, <code>to</code>). May have zero rows (an
edgeless graph, laid out on a circle).</dd>


<dt>n_nodes</dt>
<dd>Number of nodes. Defaults to the largest index in <code>edges</code>
(so isolated high-index nodes need this set explicitly).</dd>


<dt>niter</dt>
<dd>Number of iterations. Default 500.</dd>


<dt>seed</dt>
<dd>Integer seed for the initial placement. <code>NULL</code> uses
<code>getOption("ggsketch.seed", 1L)</code>. The layout is otherwise deterministic.</dd>

</dl>

force_layout: Force-directed graph layout (Fruchterman-Reingold)

Description

Usage

Value

Arguments

Examples