在wcharczuk/go-chart图表上打印文字

先看效果：

源码

package main

import (
????"bytes"
????"fmt"
????"io/ioutil"
????"log"
????"os"

????"github.com/wcharczuk/go-chart/drawing"

????"github.com/golang/freetype/truetype"
????"github.com/wcharczuk/go-chart"
)

// getZWFont 加载字体
func getZWFont() *truetype.Font {

????fontFile := "/Library/Fonts/Microsoft-YaHei.ttf"
????//fontFile := "/Library/Fonts/AppleMyungjo.ttf"

????// 读字体数据
????fontBytes, err := ioutil.ReadFile(fontFile)
????if err != nil {
????????log.Println(err)
????????return nil
????}
????font, err := truetype.Parse(fontBytes)
????if err != nil {
????????log.Println(err)
????????return nil
????}
????return font
}

func drawChart() {

????buffer := bytes.NewBuffer([]byte{})

????graph := chart.Chart{
????????Series: []chart.Series{
????????????chart.ContinuousSeries{
????????????????XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
????????????????YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
????????????},
????????????chart.AnnotationSeries{
????????????????Annotations: []chart.Value2{
????????????????????{XValue: 1.0, YValue: 1.0, Label: "One11"},
????????????????????{XValue: 2.0, YValue: 2.0, Label: "Two"},
????????????????????{XValue: 3.0, YValue: 3.0, Label: "Three"},
????????????????????{XValue: 4.0, YValue: 4.0, Label: "Four"},
????????????????????{XValue: 5.0, YValue: 5.0, Label: "Five"},
????????????????},
????????????},
????????},
????????Font: getZWFont(),
????????Elements: []chart.Renderable{
????????????TextInfo([]string{"test郭红俊yyy", "dddwf分发给ff"}),
????????},
????}
????err := graph.Render(chart.PNG, buffer)
????if err != nil {
????????log.Fatal(err)
????}

????fo, err := os.Create("o1.png")
????if err != nil {
????????panic(err)
????}

????if _, err := fo.Write(buffer.Bytes()); err != nil {
????????panic(err)
????}
}

func main() {
????drawChart()
}

// TextInfo 显示文字
func TextInfo(txtArr []string) chart.Renderable {
????return func(r chart.Renderer, cb chart.Box, chartDefaults chart.Style) {
????????log.Println(fmt.Sprintf("h:%d; w:%d", cb.Height(), cb.Width()))
????????log.Println(chartDefaults)
????????log.Println(cb)

????????r.SetFont(getZWFont())
????????r.SetFontColor(drawing.ColorBlue)
????????r.SetFontSize(14)
????????i := 0
????????for _, txt := range txtArr {
????????????r.Text(txt, 60+i*10, 40+i*30)
????????????i++
????????}
????????log.Println("12444")
????}
}

在wcharczuk/go-chart图表上打印文字

原文：https://www.cnblogs.com/ghj1976/p/11363715.html