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package main
import (
"fmt"
"io"
"path/filepath"
"sort"
"strconv"
"strings"
"github.com/wcharczuk/go-chart"
)
const maxticks = 20
const cutoff = 70
type GraphConf struct {
pgnum, conf float64
}
func graph(confs map[string]*Conf, bookname string, w io.Writer) (error) {
// Organise confs to sort them by page
var graphconf []GraphConf
for _, conf := range confs {
name := filepath.Base(conf.path)
numend := strings.Index(name, "_")
pgnum, err := strconv.ParseFloat(name[0:numend], 64)
if err != nil {
continue
}
var c GraphConf
c.pgnum = pgnum
c.conf = conf.conf
graphconf = append(graphconf, c)
}
sort.Slice(graphconf, func(i, j int) bool { return graphconf[i].pgnum < graphconf[j].pgnum })
// Create main xvalues and yvalues, annotations and ticks
var xvalues, yvalues []float64
var annotations []chart.Value2
var ticks []chart.Tick
i := 0
tickevery := len(graphconf) / maxticks
for _, c := range graphconf {
i = i + 1
xvalues = append(xvalues, c.pgnum)
yvalues = append(yvalues, c.conf)
if c.conf < cutoff {
annotations = append(annotations, chart.Value2{Label: fmt.Sprintf("%.0f", c.pgnum), XValue: c.pgnum, YValue: c.conf})
}
if tickevery % i == 0 {
ticks = append(ticks, chart.Tick{c.pgnum, fmt.Sprintf("%.0f", c.pgnum)})
}
}
mainSeries := chart.ContinuousSeries{
XValues: xvalues,
YValues: yvalues,
}
// Create 70% line
yvalues = []float64{}
for _ = range xvalues {
yvalues = append(yvalues, cutoff)
}
cutoffSeries := chart.ContinuousSeries{
XValues: xvalues,
YValues: yvalues,
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorAlternateGreen,
StrokeDashArray: []float64{10.0, 5.0},
},
}
// Create lines marking top and bottom 10% confidence
sort.Slice(graphconf, func(i, j int) bool { return graphconf[i].conf < graphconf[j].conf })
lowconf := graphconf[int(len(graphconf) / 10)].conf
highconf := graphconf[int((len(graphconf) / 10) * 9)].conf
yvalues = []float64{}
for _ = range graphconf {
yvalues = append(yvalues, lowconf)
}
minSeries := &chart.ContinuousSeries{
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorAlternateGray,
StrokeDashArray: []float64{5.0, 5.0},
},
XValues: xvalues,
YValues: yvalues,
}
yvalues = []float64{}
for _ = range graphconf {
yvalues = append(yvalues, highconf)
}
maxSeries := &chart.ContinuousSeries{
Style: chart.Style{
Show: true,
StrokeColor: chart.ColorAlternateGray,
StrokeDashArray: []float64{5.0, 5.0},
},
XValues: xvalues,
YValues: yvalues,
}
graph := chart.Chart{
Title: bookname,
TitleStyle: chart.StyleShow(),
Width: 1920,
Height: 1080,
XAxis: chart.XAxis{
Name: "Page number",
NameStyle: chart.StyleShow(),
Style: chart.StyleShow(),
Range: &chart.ContinuousRange{
Min: 0.0,
},
Ticks: ticks,
},
YAxis: chart.YAxis{
Name: "Confidence",
NameStyle: chart.StyleShow(),
Style: chart.StyleShow(),
Range: &chart.ContinuousRange{
Min: 0.0,
Max: 100.0,
},
},
Series: []chart.Series{
mainSeries,
minSeries,
maxSeries,
cutoffSeries,
chart.AnnotationSeries{
Annotations: annotations,
},
},
}
return graph.Render(chart.PNG, w)
}
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