绘制图表动态数据

Question

Using this library "https://github.com/wcharczuk/go-chart" I want to generate pie chart using json data.

Code

pie := chart.PieChart{
        Width:  512,
        Height: 512,
        Values: []chart.Value{
            {Value: 5, Label: "Blue"},
            {Value: 5, Label: "Green"},
            {Value: 4, Label: "Gray"},      
        },
    }

My Json

"reaction_summary": {
"ANGRY": 7,
"HAHA": 40,
"LIKE": 161,
"LOVE": 56,
"SAD": 26,
"SHOCK": 6
}

What I really want to achieve is this

data = Parse/map json as the content of chart.Value

pie := chart.PieChart{
        Width:  512,
        Height: 512,
        Values: []chart.Value{
            data    
        },
    }

Answer 1

Something along the lines of

raw := `{"reaction_summary": {"ANGRY": 7,"HAHA": 40,"LIKE": 161,"LOVE": 56,"SAD": 26,"SHOCK": 6}}`

// Parse JSON
data := struct {
    ReactionSummary map[string]int `json:"reaction_summary"`
}{}
if err := json.Unmarshal([]byte(raw), &data); err != nil {
    log.Fatal(err)
}
// Populate a slice of chart values
var values []chart.Value
for l, v := range data.ReactionSummary {
    values = append(values, chart.Value{Label: l, Value: float64(v)})
}
// Initialize the chart
pie := chart.PieChart{
    Width:  512,
    Height: 512,
    Values: values,
}

Result: