Golang using Graphviz

This is a creation in Article, where the information may have evolved or changed.

Graphviz's Introduction Please refer to: http://www.cnblogs.com/ghj1976/p/4539788.html

Installing Graphviz

The version of the corresponding operating system needs to be downloaded in http://www.graphviz.org/Download_macos.php.

After the installation is complete, you can use the DOT–V command to view the installed version and confirm the installation

After the MAC is installed, there will be a Graphviz app that can view the *.GV file as shown in the effect:

Generate Graphviz File

The encapsulation method for generating Graphviz files with Golang is as follows:

Https://github.com/awalterschulze/gographviz

The sample code we use it is as follows:

Package Main

Import (
"FMT"
"Github.com/awalterschulze/gographviz"
)

Func Main () {
Graphast, _: = Gographviz. Parse ([]byte (' digraph g{} '))
Graph: = Gographviz. Newgraph ()
Gographviz. Analyse (graphast, graph)
Graph. AddNode ("G", "a", nil)
Graph. AddNode ("G", "B", nil)
Graph. Addedge ("A", "B", true, nil)
Fmt. Println (graph. String ())
}

The execution effect is as follows:

The command line that uses DOT to generate PNG is as follows:

Dot 11.gv-t png-o 11.png

The complete Go code is as follows:

Package Main

Import (
"Bytes"
"FMT"
"Github.com/awalterschulze/gographviz"
"Io/ioutil"
"Os/exec"
)

Func Main () {
Graphast, _: = Gographviz. Parse ([]byte (' digraph g{} '))
Graph: = Gographviz. Newgraph ()
Gographviz. Analyse (graphast, graph)
Graph. AddNode ("G", "a", nil)
Graph. AddNode ("G", "B", nil)
Graph. Addedge ("A", "B", true, nil)
Fmt. Println (graph. String ())

Output file
Ioutil. WriteFile ("11.GV", []byte (graph). String ()), 0666)

Create picture
System ("Dot 11.gv-t png-o 12.png")
}

The method that invokes the system instruction, the parameter s is the shell command called
Func system (s string) {
CMD: = Exec.command ('/bin/sh ', '-C ', s)//Call Command function
var out bytes. Buffer//Buffered bytes

Cmd. Stdout = &out//Standard output
ERR: = cmd. Run ()//running instructions, making judgments
If err! = Nil {
Fmt. PRINTLN (ERR)
}
Fmt. Printf ("%s", out. String ())//Output execution result
}

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