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https://github.com/goccy/go-graphviz
Go bindings for Graphviz
https://github.com/goccy/go-graphviz
dot-language go golang golang-library graphviz
Last synced: 3 days ago
JSON representation
Go bindings for Graphviz
- Host: GitHub
- URL: https://github.com/goccy/go-graphviz
- Owner: goccy
- License: mit
- Created: 2020-01-28T13:24:09.000Z (almost 5 years ago)
- Default Branch: master
- Last Pushed: 2024-10-24T11:31:26.000Z (3 months ago)
- Last Synced: 2024-10-25T10:27:00.169Z (3 months ago)
- Topics: dot-language, go, golang, golang-library, graphviz
- Language: Go
- Size: 4.96 MB
- Stars: 645
- Watchers: 11
- Forks: 68
- Open Issues: 9
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- my-awesome - goccy/go-graphviz - language,go,golang,golang-library,graphviz pushed_at:2025-01 star:0.8k fork:0.1k Go bindings for Graphviz (Go)
README
# go-graphviz [](https://github.com/goccy/go-graphviz/actions) [](https://pkg.go.dev/github.com/goccy/go-graphviz)
Go bindings for Graphviz
# Features
Graphviz version is [here](./graphviz.version)
- Pure Go Library
- No need to install Graphviz library ( ~`brew install graphviz`~ or ~`apt-get install graphviz`~ )
- The Graphviz library has been converted to WebAssembly (WASM) and embedded it, so it works consistently across all environments
- Supports encoding/decoding for DOT language
- Supports custom renderer for custom format
- Supports setting graph properties in a type-safe manner
## Supported Layout
`circo` `dot` `fdp` `neato` `nop` `nop1` `nop2` `osage` `patchwork` `sfdp` `twopi`
## Supported Format
`dot` `svg` `png` `jpg`
The above are the formats supported by default. You can also add custom formats.
# Installation
```bash
$ go get github.com/goccy/go-graphviz
```
# Synopsis
## 1. Write DOT Graph in Go
```go
package main
import (
"bytes"
"fmt"
"log"
"github.com/goccy/go-graphviz"
)
func main() {
ctx := context.Background()
g, err := graphviz.New(ctx)
if err != nil { panic(err )}
graph, err := g.Graph()
if err != nil { panic(err) }
defer func() {
if err := graph.Close(); err != nil { panic(err) }
g.Close()
}()
n, err := graph.CreateNodeByName("n")
if err != nil { panic(err) }
m, err := graph.CreateNodeByName("m")
if err != nil { panic(err) }
e, err := graph.CreateEdgeByName("e", n, m)
if err != nil { panic(err) }
e.SetLabel("e")
var buf bytes.Buffer
if err := g.Render(ctx, graph, "dot", &buf); err != nil {
log.Fatal(err)
}
fmt.Println(buf.String())
}
```
## 2. Parse DOT Graph
```go
path := "/path/to/dot.gv"
b, err := os.ReadFile(path)
if err != nil { panic(err) }
graph, err := graphviz.ParseBytes(b)
```
## 3. Render Graph
```go
ctx := context.Background()
g, err := graphviz.New(ctx)
if err != nil { panic(err) }
graph, err := g.Graph()
if err != nil { panic(err) }
// create your graph
// 1. write encoded PNG data to buffer
var buf bytes.Buffer
if err := g.Render(ctx, graph, graphviz.PNG, &buf); err != nil { panic(err) }
// 2. get as image.Image instance
image, err := g.RenderImage(ctx, graph)
if err != nil { panic(err) }
// 3. write to file directly
if err := g.RenderFilename(ctx, graph, graphviz.PNG, "/path/to/graph.png"); err != nil { panic(err) }
```
# Tool
## `dot`
### Installation
```bash
$ go install github.com/goccy/go-graphviz/cmd/dot@latest
```
### Usage
```
Usage:
dot [OPTIONS]
Application Options:
-T= specify output format ( currently supported: dot svg png jpg ) (default: dot)
-K= specify layout engine ( currently supported: circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi )
-o= specify output file name
Help Options:
-h, --help Show this help message
```
# How it works
1. Generates bindings between Go and C from [Protocol Buffers file](./internal/wasm/bind.proto).
2. Builds graphviz.wasm on the [docker container](./internal/wasm/build/Dockerfile).
3. Uses Graphviz functionality from a sub-packages ( `cdt` `cgraph` `gvc` ) via the `internal/wasm` package.
4. `graphviz` package provides facade interface for all sub packages.
# License
MIT
This library embeds and uses `graphviz.wasm`, which is generated based on the original source code of Graphviz. Therefore, the `graphviz.wasm` follows [the license adopted by Graphviz](https://graphviz.org/license) ( Eclipse Public License ).