Gerber Viewer

A Java library for parsing Gerber RS-274X and Excellon drill files with SVG rendering.

Features

• Parse Gerber RS-274X files (.gbr, .ger, .gtl, .gbl, .gts, .gbs, .gto, .gbo, etc.)
• Parse Excellon drill files (.drl, .txt, .xln)
• Render PCB layers as SVG with proper scaling
• Support for all standard apertures (circle, rectangle, obround, polygon)
• Aperture macros with primitives (circle, line, outline, polygon, moire, thermal)
• Region fills (G36/G37)
• Arc interpolation (G02/G03) with single and multi-quadrant modes
• Layer polarity (LPD/LPC)
• Step and repeat (SR)
• Interactive web viewer with pan/zoom
• Toggle individual layers on/off
• Multi-layer composite rendering

Quick Start

mvn clean install
mvn exec:java -Dexec.mainClass="nl.bytesoflife.gerber.web.GerberViewerServer"

Open http://localhost:8080 and upload a Gerber ZIP archive.

Aperture Visual Test

The library includes a comprehensive visual test for aperture rendering that compares our implementation against reference images.

View Aperture Visual Test

Project Structure

• src/main/java/nl/bytesoflife/gerber/parser - Gerber and Excellon parsers
• src/main/java/nl/bytesoflife/gerber/lexer - Tokenizer for Gerber files
• src/main/java/nl/bytesoflife/gerber/model - Data model for Gerber documents
• src/main/java/nl/bytesoflife/gerber/svg - SVG rendering engine
• src/main/java/nl/bytesoflife/gerber/web - Web viewer server

Usage as Library

// Parse a Gerber file
GerberParser parser = new GerberParser();
GerberDocument doc = parser.parse(gerberContent);

// Render to SVG
GerberToSvgConverter converter = new GerberToSvgConverter();
String svg = converter.convert(doc);

// Parse an Excellon drill file
ExcellonParser drillParser = new ExcellonParser();
ExcellonDocument drillDoc = drillParser.parse(excellonContent);

License

MIT