rjson

Documentation

Overview

Package rjson contains tools to marshal ROOT objects to JSON.

Index

• func Marshal(o root.Object) ([]byte, error)

Examples

• Marshal

Functions

func Marshal

func Marshal(o root.Object) ([]byte, error)

Example

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"log"

	"go-hep.org/x/hep/groot/rhist"
	"go-hep.org/x/hep/groot/rjson"
	"go-hep.org/x/hep/hbook"
)

func main() {
	h := hbook.NewH1D(5, 0, 5)
	h.Fill(1, 1)
	h.Fill(-1, 1)
	h.Ann["name"] = "h1"
	h.Ann["title"] = "my title"

	raw, err := rjson.Marshal(rhist.NewH1FFrom(h))
	if err != nil {
		log.Fatalf("could not marshal to ROOT JSON: %+v", err)
	}

	buf := new(bytes.Buffer)
	err = json.Indent(buf, raw, "", "  ")
	if err != nil {
		log.Fatalf("could not indent JSON: %+v", err)
	}

	fmt.Printf("json: %s\n", buf.String())

}

Output:

json: {
  "_typename": "TH1F",
  "fUniqueID": 0,
  "fBits": 50331648,
  "fName": "h1",
  "fTitle": "my title",
  "fLineColor": 602,
  "fLineStyle": 1,
  "fLineWidth": 1,
  "fFillColor": 0,
  "fFillStyle": 1001,
  "fMarkerColor": 1,
  "fMarkerStyle": 1,
  "fMarkerSize": 1,
  "fNcells": 7,
  "fXaxis": {
    "_typename": "TAxis",
    "fUniqueID": 0,
    "fBits": 50331648,
    "fName": "xaxis",
    "fTitle": "",
    "fNdivisions": 510,
    "fAxisColor": 1,
    "fLabelColor": 1,
    "fLabelFont": 42,
    "fLabelOffset": 0.005,
    "fLabelSize": 0.035,
    "fTickLength": 0.03,
    "fTitleOffset": 1,
    "fTitleSize": 0.035,
    "fTitleColor": 1,
    "fTitleFont": 42,
    "fNbins": 5,
    "fXmin": 0,
    "fXmax": 5,
    "fXbins": [
      0,
      1,
      2,
      3,
      4,
      5
    ],
    "fFirst": 0,
    "fLast": 0,
    "fBits2": 0,
    "fTimeDisplay": false,
    "fTimeFormat": "",
    "fLabels": null,
    "fModLabs": null
  },
  "fYaxis": {
    "_typename": "TAxis",
    "fUniqueID": 0,
    "fBits": 50331648,
    "fName": "yaxis",
    "fTitle": "",
    "fNdivisions": 510,
    "fAxisColor": 1,
    "fLabelColor": 1,
    "fLabelFont": 42,
    "fLabelOffset": 0.005,
    "fLabelSize": 0.035,
    "fTickLength": 0.03,
    "fTitleOffset": 1,
    "fTitleSize": 0.035,
    "fTitleColor": 1,
    "fTitleFont": 42,
    "fNbins": 1,
    "fXmin": 0,
    "fXmax": 1,
    "fXbins": [],
    "fFirst": 0,
    "fLast": 0,
    "fBits2": 0,
    "fTimeDisplay": false,
    "fTimeFormat": "",
    "fLabels": null,
    "fModLabs": null
  },
  "fZaxis": {
    "_typename": "TAxis",
    "fUniqueID": 0,
    "fBits": 50331648,
    "fName": "zaxis",
    "fTitle": "",
    "fNdivisions": 510,
    "fAxisColor": 1,
    "fLabelColor": 1,
    "fLabelFont": 42,
    "fLabelOffset": 0.005,
    "fLabelSize": 0.035,
    "fTickLength": 0.03,
    "fTitleOffset": 1,
    "fTitleSize": 0.035,
    "fTitleColor": 1,
    "fTitleFont": 42,
    "fNbins": 1,
    "fXmin": 0,
    "fXmax": 1,
    "fXbins": [],
    "fFirst": 0,
    "fLast": 0,
    "fBits2": 0,
    "fTimeDisplay": false,
    "fTimeFormat": "",
    "fLabels": null,
    "fModLabs": null
  },
  "fBarOffset": 0,
  "fBarWidth": 1000,
  "fEntries": 2,
  "fTsumw": 2,
  "fTsumw2": 2,
  "fTsumwx": 0,
  "fTsumwx2": 2,
  "fMaximum": -1111,
  "fMinimum": -1111,
  "fNormFactor": 0,
  "fContour": [],
  "fSumw2": [
    1,
    0,
    1,
    0,
    0,
    0,
    0
  ],
  "fOption": "",
  "fFunctions": {
    "_typename": "TList",
    "name": "",
    "arr": [],
    "opt": []
  },
  "fBufferSize": 0,
  "fBuffer": [],
  "fBinStatErrOpt": 0,
  "fStatOverflows": 2,
  "fArray": [
    1,
    0,
    1,
    0,
    0,
    0,
    0
  ]
}