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")
}
}