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@thi.ng/geom-trace-bitmap
Advanced tools
This project is part of the @thi.ng/umbrella monorepo.
Bitmap image to hairline vector and point cloud conversions. This is a support package for @thi.ng/geom.
This package provides an extensible setup to extract user selectable
single-pixel width line segments in horizontal, vertical and diagonal (45°)
directions and/or single pixels as 2d point cloud. The main
traceBitmap()
function supports a predicate function to filter qualifying pixel values,
options to control which line orientations should be considered (incl. providing
custom ones and in which order of application), as well as a 2x3 matrix to
transform extracted points (pixel coordinates). See
TraceBitmapOpts
and example below for details.
ALPHA - bleeding edge / work-in-progress
Search or submit any issues for this package
yarn add @thi.ng/geom-trace-bitmap
ES module import:
<script type="module" src="https://cdn.skypack.dev/@thi.ng/geom-trace-bitmap"></script>
For Node.js REPL:
const geomTraceBitmap = await import("@thi.ng/geom-trace-bitmap");
Package sizes (brotli'd, pre-treeshake): ESM: 988 bytes
Several demos in this repo's /examples directory are using this package.
A selection:
Screenshot | Description | Live demo | Source |
---|---|---|---|
![]() | Multi-layer vectorization & dithering of bitmap images | Demo | Source |
TODO
For brevity, this example uses
thi.ng/pixel-io-netpbm
to load an image in PGM format. For that image format, the read()
function
returns a thi.ng/pixel
IntBuffer using the
GRAY8
pixel format...
import { asSvg, group, line, points, svgDoc } from "@thi.ng/geom";
import { traceBitmap } from "@thi.ng/geom-trace-bitmap";
import { read } from "@thi.ng/pixel-io-netpbm";
import { readFileSync, writeFileSync } from "fs";
// vectorize bitmap, the returned arrays contain:
// - pairs of vectors (line segments)
// - vectors (points)
const { lines, points: dots } = traceBitmap({
// source image (WILL be mutated!)
img: read(readFileSync("foo.pgm")),
// pixel selection predicate (here to select all bright pixels)
select: (x) => x > 128,
// process horizontals, verticals, diagonals & points (default)
// see: https://docs.thi.ng/umbrella/geom-trace-bitmap/types/TraceDir.html
dir: ["h", "v", "d1", "d2", "p"]
});
// write extracted geometry as SVG file
writeFileSync(
"export/trace.svg",
asSvg(
svgDoc(
{},
group({}, lines.map(([a,b]) => line(a, b))),
points(dots, { fill: "#000", stroke: "none" })
)
)
);
If this project contributes to an academic publication, please cite it as:
@misc{thing-geom-trace-bitmap,
title = "@thi.ng/geom-trace-bitmap",
author = "Karsten Schmidt",
note = "https://thi.ng/geom-trace-bitmap",
year = 2022
}
© 2022 - 2023 Karsten Schmidt // Apache License 2.0
FAQs
Bitmap image to hairline vector and point cloud conversions
The npm package @thi.ng/geom-trace-bitmap receives a total of 115 weekly downloads. As such, @thi.ng/geom-trace-bitmap popularity was classified as not popular.
We found that @thi.ng/geom-trace-bitmap demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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