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example_test.go
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example_test.go
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//Copyright 2013 GoGraphviz Authors
//
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
package gographviz
import (
"fmt"
"strconv"
)
func ExampleRead() {
g, err := Read([]byte(`digraph G {Hello->World}`))
if err != nil {
panic(err)
}
s := g.String()
fmt.Println(s)
// Output: digraph G {
// Hello->World;
// Hello;
// World;
//}
}
func ExampleNewGraph() {
g := NewGraph()
if err := g.SetName("G"); err != nil {
panic(err)
}
if err := g.SetDir(true); err != nil {
panic(err)
}
if err := g.AddNode("G", "Hello", nil); err != nil {
panic(err)
}
if err := g.AddNode("G", "World", nil); err != nil {
panic(err)
}
if err := g.AddEdge("Hello", "World", true, nil); err != nil {
panic(err)
}
s := g.String()
fmt.Println(s)
// Output: digraph G {
// Hello->World;
// Hello;
// World;
//}
}
type MyOwnGraphStructure struct {
weights map[int]map[int]int
max int
}
func NewMyOwnGraphStructure() *MyOwnGraphStructure {
return &MyOwnGraphStructure{
make(map[int]map[int]int),
0,
}
}
func (myown *MyOwnGraphStructure) SetStrict(strict bool) error { return nil }
func (myown *MyOwnGraphStructure) SetDir(directed bool) error { return nil }
func (myown *MyOwnGraphStructure) SetName(name string) error { return nil }
func (myown *MyOwnGraphStructure) AddPortEdge(src, srcPort, dst, dstPort string, directed bool, attrs map[string]string) error {
srci, err := strconv.Atoi(src)
if err != nil {
return err
}
dsti, err := strconv.Atoi(dst)
if err != nil {
return err
}
ai, err := strconv.Atoi(attrs["label"])
if err != nil {
return err
}
if _, ok := myown.weights[srci]; !ok {
myown.weights[srci] = make(map[int]int)
}
myown.weights[srci][dsti] = ai
if srci > myown.max {
myown.max = srci
}
if dsti > myown.max {
myown.max = dsti
}
return nil
}
func (myown *MyOwnGraphStructure) AddEdge(src, dst string, directed bool, attrs map[string]string) error {
return myown.AddPortEdge(src, "", dst, "", directed, attrs)
}
func (myown *MyOwnGraphStructure) AddNode(parentGraph string, name string, attrs map[string]string) error {
return nil
}
func (myown *MyOwnGraphStructure) AddAttr(parentGraph string, field, value string) error {
return nil
}
func (myown *MyOwnGraphStructure) AddSubGraph(parentGraph string, name string, attrs map[string]string) error {
return nil
}
func (myown *MyOwnGraphStructure) String() string { return "" }
// An Example of how to parse into your own simpler graph structure and output it back to graphviz.
// This example reads in only numbers and outputs a matrix graph.
func ExampleMyOwnGraphStructure() {
name := "matrix"
parsed, err := Parse([]byte(`
digraph G {
1 -> 2 [ label = 5 ];
4 -> 2 [ label = 1 ];
4 -> 1 [ label = 2 ];
1 -> 1 [ label = 0 ];
}
`))
if err != nil {
panic(err)
}
mine := NewMyOwnGraphStructure()
if err := Analyse(parsed, mine); err != nil {
panic(err)
}
output := NewGraph()
if err := output.SetName(name); err != nil {
panic(err)
}
if err := output.SetDir(true); err != nil {
panic(err)
}
for i := 1; i <= mine.max; i++ {
if err := output.AddNode(name, fmt.Sprintf("%v", i), nil); err != nil {
panic(err)
}
if _, ok := mine.weights[i]; !ok {
mine.weights[i] = make(map[int]int)
}
}
for i := 1; i <= mine.max; i++ {
for j := 1; j <= mine.max; j++ {
if err := output.AddEdge(fmt.Sprintf("%v", i), fmt.Sprintf("%v", j), true, map[string]string{"label": fmt.Sprintf("%v", mine.weights[i][j])}); err != nil {
panic(err)
}
}
}
s := output.String()
fmt.Println(s)
// Output: digraph matrix {
// 1->1 [ label=0 ];
// 1->2 [ label=5 ];
// 1->3 [ label=0 ];
// 1->4 [ label=0 ];
// 2->1 [ label=0 ];
// 2->2 [ label=0 ];
// 2->3 [ label=0 ];
// 2->4 [ label=0 ];
// 3->1 [ label=0 ];
// 3->2 [ label=0 ];
// 3->3 [ label=0 ];
// 3->4 [ label=0 ];
// 4->1 [ label=2 ];
// 4->2 [ label=1 ];
// 4->3 [ label=0 ];
// 4->4 [ label=0 ];
// 1;
// 2;
// 3;
// 4;
//}
}